CN101995233B - Angle measuring method for sun precision tracking and digital photoelectric angle sensor - Google Patents
Angle measuring method for sun precision tracking and digital photoelectric angle sensor Download PDFInfo
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Abstract
The invention relates to an angle measuring method for sun precision tracking and a digital photoelectric angle sensor, which belong to the fields of solar energy application and meteorological observation instruments. The measuring method is based on the slit imaging principle, and parallel light incident from the sun is imaged on a CCD (Charge Coupled Device) photosensitive unit through an optical imaging unit. The incident angle of the sun light in one direction at a certain moment is obtained through measuring pixel code position signals corresponding to light spot centroid and carrying out arc tangent calculation by known parameters. The digital photoelectric angle sensor comprises the optical imaging unit, a photoelectric detecting unit, an information processing unit, an output interface unit, a casing and the like. The incident angle of the incident light of the sun in two directions can be precisely measured by the method and two digital photoelectric angle sensors of the invention, precise sun azimuth signals can be provided, and the precision tracking and the radiation measurement of sun targets can be realized. The sensor has the advantages of simple structure, small size, no chromatic aberration, precise measurement angle and high accuracy.
Description
Technical field
The present invention relates to Application of Solar Energy field, meteorological observation instrument field, particularly a kind of digital optoelectronic angle sensor that is used for sun precision tracking.
Background technology
The energy is that human civilization exists and the important support that develops, and also be the indispensable resource of human survival, but in the present world wide, traditional fossil fuel constantly reduces, and is badly in need of seeking substitute energy confession human being's production and uses with living.In all substitute energy kinds, characteristics such as sun power is inexhaustible, nexhaustible with it, clean environment firendly, free justice more and more receive people's favor, become the focus that people attract attention.
As clean energy resource, the human at present utilization to sun power mainly contains light-electricity conversion and two kinds of forms of light-thermal cross over, i.e. two big types of solar electrical energy generation and solar energy heatings.Yet the sun power utilization of these two kinds of forms all exists problems such as sun power space radiation distribution changes constantly, energy centralization density is low, has reduced the service efficiency of sun power, has influenced the universal utilization of sun power.How with solar energy highly effective change into easy-to-use electric energy or heat energy, become one of current great research topic.
At present under the certain condition of the conversion efficiency of solar panel and solar thermal collector itself; One of effective way that further improves the sun power utilization ratio is carried out real-time follow-up to the sun exactly, constantly keeps the light-sensitive surface of transducer vertical with the incident ray of the sun.Research shows, the tracking of the sun and non-tracking, and the receiving efficiency of energy differs about 37.7%.With fixing photovoltaic generation apparatus in comparison, can improve about 35% from the generating set generated energy of motion tracking.It is thus clear that, accurately follow the tracks of the sun conversion efficiency of transducer is improved greatly, and then improve the efficient of solar energy application system, help the universal utilization of sun power.Therefore, in the Application of Solar Energy field, solar azimuth is carried out high precision tracking just become a necessary gordian technique.
According to common sorting technique, the solar tracking mode has photoelectric sensor to follow the tracks of and look the daily motion track following usually.It is to utilize a plurality of analog photoelectric sensor sensitization that sensor is followed the tracks of, and carries out light-to-current inversion.As single analog photoelectric sensor, photodiode, phototriode, photoelectric cell, thermopair, photoresistance, four-quadrant photovoltaic sensor, photomultiplier etc. are arranged.Existing photoelectric sensor tracking mode is owing to be to utilize the difference of the light intensity signal of simulation to carry out angular detection, exist element sensitivity along with time and temperature drift, measuring error is big, measuring accuracy is low, shortcoming such as lose objects sometimes.Especially when using a plurality of photoelectric sensor, its sensitivity discreteness problem is the greatest problem that influences measuring accuracy.Because measuring accuracy is low, make the extra cost that increased of solar energy application system, sometimes even lost the meaning that in equipment, increases tracker.Though can all-weather real-time follow the tracks of and look day tracking, calculation of complex and tracking accuracy are lower.
In addition, in the meteorological observation field, the common instrument of measuring solar radiation is the solar radiation table.For a long time, in solar radiation observation, existing a difficult problem, is exactly how to realize reliable and accurate the tracking to solar azimuth.Direct radiation is owing to observation is the direct radiation energy from the sun, and the accuracy of its observed result directly depends on the height of tracking accuracy.When the axis of direct solar radiation table and sunray incident angle depart from, with the energy that incides sensor surface is reduced, produce very big measuring error, increased the uncertainty of observed result.World's majority state still adopts simple uniaxiality tracking device to drive the surveying instrument of solar radiation at present, and measuring error is big, can not satisfy measurement requirement.
Summary of the invention
The object of the present invention is to provide a kind of digital optoelectronic angle sensor that is used for sun precision tracking, comprise optical imagery unit, photodetection unit, information process unit, output interface unit, housing etc.Wherein, described optical imagery unit is fixed on housing one end, and sunshine gets into sensor from image-generating unit; The other end of housing is arranged photodetection unit, information process unit, electrical interface unit etc. respectively.Described optical imagery unit is made up of trim ring, glass protecting cover, ring washer, neutral colour filter, slit etc. successively and is arranged in order, and is installed in the front end of housing; Described slit is an optical slot, can be formed by machining, also can be processed by glass etch technique.Described photodetection unit is made up of spike interference filter, line array CCD, photosignal pre-process circuit, automatic gain control circuit, high-speed a/d converter, first microprocessor A; The center line of slit is vertical each other with the one dimension pixel array centerline of line array CCD; And foundation takes measurement of an angle and the requirement of precision, confirms the distance on slit and line array CCD pixel surface and the pixel number of line array CCD.Described CCD photoelectric sensor adopts the linear array type, and pixel quantity can be 256,1024,1728,2048,2700,3468,5000 or 7500; Functions such as the amplification of photosignal pre-process circuit completion ccd output signal, filtering are realized by the high-speed computation amplifying circuit; Automatic gain control circuit is built by special IC or universal integrated circuit, accomplishes the amplitude of photosignal and just controls; A/D converter is selected 10 or 12 s' high speed device for use, and its function is that light intensity space distribution signal is changed into digital signal.First microprocessor A adopts arm processor, be responsible for to drive line array CCD, programme-controlled gain, floating threshold setting, data acquisition and latchs etc.The photodetection unit is a core with first microprocessor A; The functions such as driving, data acquisition and pre-service of line array CCD are combined together; The phase place and the frequency that can guarantee pulse that processor is sent out are accurate, stable, synchronous; Simplify the circuit structure of CCD detection system, thereby make it have special advantages in the dynamic angle context of detection.Described information process unit is made up of the second microprocessor B and peripheral circuit etc.; The second microprocessor B adopts arm processor equally, is responsible for angle calculation and shows with solar azimuth calculating, angle calibration, error correction, angle, sets, and the PC communication, sends drive signal etc. for topworks.The second microprocessor B is used to control the operation of total system.Described output interface unit is made up of USB mouth, digital integrated circuit, and its effect is that measurement of angle information is exported to topworks.Wherein the USB mouth is the interface of 2.0 standards that carry of arm processor, is responsible for carrying out communication with PC; Digital integrated circuit is mainly accomplished functions such as buffering driving, power amplification and photoelectricity isolation.Described housing is formed by lighttight materials processings such as metal material or plastic materials, and its shape can be for square or be cylindrical shape; For the optical element that prevents enclosure interior and electricity device because the variation of environment temperature produces the dewfall phenomenon, in housing, charge into inert gas.
Owing to adopted dual core processor technology, greatly strengthened the control and data acquisition, processing power of system, solved the problem of common monokaryon microprocessor application system processing power deficiency.
In order to realize the requirement of round-the-clock outside work, adopted hermetically-sealed construction, optics and signal processing are enclosed in the airtight cavity, realize purpose dustproof, waterproof.
The concrete structure that is used for the digital optoelectronic angle sensor of sun precision tracking according to the invention is: mainly comprise optical imagery unit, photodetection unit, information process unit, output interface unit, housing etc.; Wherein, Described optical imagery unit is fixed on the front end of housing 6; This optical imagery unit is made up of trim ring 1, glass protecting cover 2, ring washer 3, neutral colour filter 4 and slit 5; Said slit 5 is bonded in the entrance pupil front of housing 6, and neutral colour filter 4, ring washer 3 and glass protecting cover 2 are fastened on the front end of slit 5 in regular turn through trim ring 1.
Described photodetection unit places the rear end of housing 6; The photodetection unit comprises spike interference filter 7, line array CCD 8 and link to each other in regular turn signal pre-processing circuit, automatic gain control circuit, high-speed a/d converter, first microprocessor A; Said spike interference filter 7 is bonded on the housing 6; Line array CCD 8 is welded on the printed circuit board 9, and printed circuit board 9 is fixed on the step of housing 6; O RunddichtringO 10 is enclosed within on the step cutting pattern of bonnet 13, realizes sealing functions with bonnet 13 and housing 6;
Described information process unit 11 comprises second microprocessor B and the peripheral circuit; Information process unit 11 is fixed on the output interface unit 13 through the tapped copper post 12 of hexagon; Output interface unit 13 is fixed on the bonnet 15 through the tapped copper post 14 of hexagon, and bonnet 15 is provided with wire hole and is fixed on the housing 6 with trip bolt 16;
With the center line each other vertical installation of above-mentioned slit 5 center lines with the one dimension pixel array of line array CCD 8, CCD pixel width is known a, and the distance on slit center line and CCD sensitization pixel surface is known H; The size of measurement of angle scope and the height of angular resolution are counted both decisions by the distance and the CCD pixel on slit and line array CCD 8 pixels surface;
Measuring slit 5 center lines are N0 at the resulting pixel coding site of the lip-deep orthogonal projection of CCD pixel, and as the benchmark initial point, corresponding position of sun 1;
Measure when the sun runs to position 2, the incident ray of the sun is imaged onto on the CCD pixel surface through image-generating unit, obtains new pixel coding site N1;
Can be obtained by geometric relationship, the angle θ of sunshine off-vertical incident is:
When sun incident light is positioned at the left side of slit 5, promptly during N1＜N0, the incident angle θ that records is a negative value; When sun incident light is positioned at the right side of slit 5, promptly during N1＞N0, the incident angle θ that records on the occasion of.
Described slit 5 is an optical slot, is processed by machining or glass etch technique.
Described slit 5 center lines are vertical each other with the one dimension pixel center line of the line array CCD 8 of optical detection unit, and foundation takes measurement of an angle and the requirement of precision, confirms the distance on slit and line array CCD 8 pixels surface and the pixel number of line array CCD 8.
Described housing 6 is made up of lighttight material, and it is shaped as square or cylindrical shape.
The invention solves analog photoelectric sensor sensibility that prior art exists along with time and temperature drift, measuring error is big, measuring accuracy is low, shortcoming such as lose objects sometimes.The angle measurement method that is used for sun precision tracking of the present invention is based on the slit image-forming principle, with the directional light of sun incident through the optical imagery cell imaging to the photosensitive unit of digital optoelectronic angle sensor; Through measuring the pairing pixel encoded position signal of facula mass center, utilize the known parameters that is stored in the microprocessor again, through arctangent computation, try to achieve the incident angle on direction of a certain moment sunshine.Adopt line array CCD (Charge Coupled Device: the subtle change of perception sun incident directional light angle charge-coupled image sensor); The luminous energy conversion of signals that line array CCD will be radiated in the photosensitive unit becomes the electric signal accurate relevant with the pixel position; Because arrangement evenly between the line array CCD pixel, size is accurate, consistance is high, is particularly suitable for minute sized high-acruracy survey, the location of one dimension, can obtain very high measurement and bearing accuracy easily; Line array CCD utilizes accurate space distribution information but not the light intensity signal itself of light intensity to take measurement of an angle, and has avoided analog photoelectric sensor to utilize light intensity signal itself to carry out the defective that angle measurement produces merely.The center line of slit is vertical each other with the one dimension pixel array centerline of line array CCD, and foundation takes measurement of an angle and the requirement of precision, confirms the distance and the CCD pixel number on slit and line array CCD pixel surface; Promptly adjust the distance and the line array CCD pixel number on slit and line array CCD pixel surface, just can adjust the size of angle measurement scope and the height of angle resolution.The angle measurement method that is used for sun precision tracking according to the invention; Based on slit image-forming principle and digital line array CCD sensor, the size of angle measurement scope and the height of angular resolution are counted both by the distance on slit and line array CCD pixel surface and line array CCD pixel and are determined jointly.
The workflow that is used for the digital optoelectronic angle sensor of sun precision tracking according to the invention is:
The directional light of sun incident forms a branch of and the perpendicular wire hot spot of one dimension pixel array line array CCD through the optical imagery unit, and this hot spot is imaged onto on the pixel of line array CCD.Under the accurate gating pulse effect that microprocessor A sends, each pixel after the amplification of photodetection circuit, filtering, sampling, through the microprocessor computing, obtains the position encoded information of facula mass center on the CCD pixel through the electric signal after the opto-electronic conversion.Utilize this position encoded information and the known constant that is stored in the microprocessor,, can try to achieve the angle of a deviation in driction vertical incidence of a certain moment sunshine, realize the object of the invention through the arctangent computation of microprocessor.
The present invention has following advantage:
1, adopt the slit imaging, simple in structure, volume is little, aberrationless.
2, adopt digital line array CCD photoelectric sensor to detect the sunshine space distribution information of incident ray intensity at a time; Overcome the drawback that analog photoelectric sensor exists, solved intrinsic sensitivity drift of analog photoelectric sensor and discreteness problem.
3, utilize the consistent characteristics of line array CCD pixel dimension height, the precision measurement angle, accuracy is high, and angle calibration is simple, helps batch assembling, debugging and the demarcation of sensor.
4, the angle signal of this digital optoelectronic angle sensor output can be used as the foundation that solar tracking system or solar radiation measuring system are carried out accurate tracking, realizes improving sun power utilization ratio and the purpose that improves the actinometry precision.
Description of drawings:
Fig. 1 is the schematic diagram of measuring method of the present invention;
Fig. 2 is the perspective exploded view of sensor of the present invention;
Fig. 3 is the section of structure of sensor of the present invention;
Fig. 4 is the block scheme of sensor of the present invention;
Fig. 5 is the front view of sensor of the present invention.
Embodiment:
Describe the present invention below in conjunction with accompanying drawing and embodiment.The concrete technical indicator of embodiment is following: the visual field: ± 24 °, and 0.025 ° of resolution, line array CCD is 2048 pixels, slit length 30mm.
The sun directional light incident angle photoelectric measurement method that is used for sun precision tracking of the present invention is based on the slit image-forming principle and adopts digital line array CCD photoelectric sensor to realize.Its fundamental measurement principle is as shown in Figure 1, and the basic step of measuring method is following:
Known line array CCD pixel width is a, and the distance on slit center line and line array CCD sensitization pixel surface is H.
The slit center line is N0 at the resulting pixel coding site of the lip-deep orthogonal projection of CCD pixel, and as the benchmark initial point, corresponding position of sun 1.For example, if adopt the line array CCD device of 2048 pixels, then under the ideal situation, N0 i.e. the coding site of 1024 or 1025 pixels,
When the sun ran to position 2, the incident ray of the sun was imaged onto on the CCD pixel surface through image-generating unit, obtained new pixel encoded position signal N1.
Can be easy to obtain by geometric relationship, at a time the angle θ of sunshine off-vertical incident is:
Can know when sun incident light by Fig. 1 to be positioned at the left side of slit that promptly during N1＜N0, the incident angle θ that records is a negative value; When sun incident light is positioned at the right side of slit, promptly during N1＞N0, the incident angle θ that records on the occasion of.
The principal character of measuring method of the present invention is: slit center line and the mutual vertical installation of the center line of the one dimension pixel array of line array CCD, the distance on slit center line and line array CCD sensitization pixel surface is known.The size of angle measurement scope and the height of angular resolution are counted both by the distance on slit and line array CCD pixel surface and CCD pixel and are determined jointly.Promptly adjust the distance and the line array CCD pixel number on slit and line array CCD pixel surface, just can adjust the size of angle measurement scope and the height of angle resolution.
The line array CCD of being selected for use among the present invention is the CCD device of 2048 pixels, can also select the CCD device of 256,1024,1728,2700,3468,5000 or 7500 pixels for use according to the difference of use needs certainly.
Referring to Fig. 2 and Fig. 3, the digital optoelectronic angle sensor that is used for the precision tracking solar azimuth of the present invention mainly comprises optical imagery unit, photodetection unit, information process unit, output interface unit, housing etc.Housing one end is the optical imagery unit, and sunshine gets into sensor from image-generating unit; The other end of housing is arranged photodetection unit, information process unit, output interface unit etc. respectively.
This sensor is by housing 6 and the slit 5 that is arranged in order at these housing 6 front ends; Neutral colour filter 4; Ring washer 3; Glass protecting cover 2; Trim ring 1 and the spike interference filter of installing successively in this housing rear end 7; Line array CCD 8; Welded the printed circuit board 9 of line array CCD 8; O RunddichtringO 10; Information process unit 11; The tapped copper post 12 of hexagon; Output interface unit 13; The tapped copper post 14 of hexagon; The trip bolt 16 of bonnet 15 and bonnet 15 is formed.Concrete assembly relation is following:
Said housing 6 is made up of lighttight material, and its shape can be for square or be cylindrical shape;
The front end of said housing 6 is opened an oval type entrance pupil, before this hole, sticks with glue slit 5; The front end of slit 5 is provided with circular neutral colour filter 4, ring washer 3, circular glass protective cover 2, and they are fastened on the front end of slit 5 in order with trim ring 1.
The rear end of said housing 6 is installed spike interference filter 7, line array CCD 8 successively and has been welded the trip bolt 16 of the tapped copper post of the tapped copper post of printed circuit board 9, O RunddichtringO 10, information process unit 11, the hexagon of line array CCD 8 12, output interface unit 13, hexagon 14, bonnet 15 and bonnet 15.Described spike interference filter 7 sticks with glue the fixed position at housing 6;
Described line array CCD 8 is welded on the printed circuit board 9, and printed circuit board 9 is screwed on the step of housing 6; O RunddichtringO 10 is enclosed within on the step cutting pattern of bonnet 13, realizes sealing functions with bonnet 13 and housing 6;
The tapped copper post 12 of described information process unit 11 usefulness hexagons is fastened on the output interface unit 13, and output interface unit 13 utilizes the tapped copper post 14 of hexagon to be fastened on the bonnet 15.Bonnet 15 is provided with wire hole and is anchored on the housing 6 with trip bolt 16.
Two tablet filters among the present invention (neutral colour filter 4, spike interference filter 7) place the front end assembling of the light-sensitive surface of line array CCD 8, its objective is in order to improve the optical purity of CCD picture, eliminate the influence of parasitic light to measuring accuracy; Wherein neutral colour filter is the energy for the sunshine that is used for decaying, and the adjustment incident flux guarantees that CCD is operated in optimum condition.Spike interference filter is in order to select the stable zone of CCD spectral response, the part spectral energy that filtering is useless, and the spectral bandwidth of restriction incident light reduces the aberration of optical system, and CCD is operated on the stable band of response.
The present invention requires the center line of slit 5 vertical each other with the one dimension pixel array centerline of line array CCD 8, and foundation takes measurement of an angle and the requirement of precision, confirms the distance on slit and line array CCD 8 pixels surface and the pixel number of line array CCD 8.
Referring to Fig. 4, the workflow of digital optoelectronic angle sensor of the present invention is:
The parallel rays that the sun sends is after glass protecting cover 2, neutral colour filter 4, the slit 5 of optical imagery unit X, Y form images; Again through spike interference filter 7; Form a branch of and the perpendicular wire hot spot of one dimension pixel array line array CCD 8, be imaged onto respectively in the photosensitive unit of line array CCD 8 separately.The light signal that is directions X (like horizontal direction) is received by the line array CCD of directions X; The light signal of Y direction (like pitch orientation) is received by the line array CCD of Y direction.
Under the accurate pulse signal and on-off circuit control that first microprocessor A sends; The light signal of both direction replaces the entering signal pre-process circuit; Through signal processing circuit amplification, filtering, be input to high-speed a/d converter, convert digital signal to; Be input in the first microprocessor A, gather and processing, metadata cache etc.The SPI interface that data transmission between first, second microprocessor A, the B adopts processor inside to carry.
The second microprocessor B utilizes spi bus to receive through the pretreated facula position coded signal of first microprocessor A N1.Utilization is stored in the line array CCD pixel width parameter a in the second microprocessor B; The distance parameter H on slit center line and line array CCD sensitization pixel surface; The slit center line is in the resulting pixel coding site of the lip-deep orthogonal projection of line array CCD pixel parameter N 0, can be by formula:
Calculate the angle θ of sunshine off-vertical incident at a time.It is the incident angle on direction of a certain moment sun incident light.
The second microprocessor B promptly can be transferred to PC through USB interface with angle information and show, also can directly deliver to LCD and show, can also measurement of angle information directly be exported to the real-time follow-up that topworks carries out sun target.
Referring to Fig. 5, according to the mutually perpendicular requirement of slit direction, two sensors are installed on the two-dimentional Plane of rotation that is driven at the same time or separately by two stepper motors, just can realize the measurement and the tracking of the level angle and the luffing angle of the sun simultaneously.Each Self Control of twin shaft is independent of each other.
It is following to utilize digital optoelectronic angle sensor of the present invention to carry out the concrete control procedure of solar tracking:
Digital optoelectronic angle sensor of the present invention is installed in the topworks that is made up of stepper motor and machine driven system.The incident angle that detects certain direction of sunshine when digital photoelectric sensor is greater than some values; For example 1 ° the time; Information process unit just sends drive signal through interface circuit to stepper motor driver; The angle that the rotation of step motor drive machine driven system need to be followed the tracks of, the light-sensitive surface that just can guarantee to be installed in the transducer in the topworks is vertical with sunshine again, the precision tracking of the realization sun.
Digital optoelectronic angle sensor of the present invention can also have multiple concrete measurement of angle embodiment.
For example:
(1), digital optoelectronic angle sensor of the present invention under static state, can measure ± the θ angular region in the angle of parallel incident light change.
(2), digital optoelectronic angle sensor of the present invention under motion state, in conjunction with multi-form topworks, can carry out the directional light incident angle of multiple mode and measure.
For example, an angular transducer is installed on the one dimension rotary actuator driven by stepper motors, the parallel installation with rotation of slit length direction just can be measured the angle signal of one dimension.Under this measurement pattern, the angle variation range can reach 0～360 °.
Two angular transducers are loaded on two orthogonal two-dimentional rotary actuators driven by stepper motors slit length direction and the parallel installation of rotation separately, angle signal that just can the luminous target of measure two dimensional respectively.
By that analogy; If three digital optoelectronic angle sensors that are used for sun precision tracking are loaded on three orthogonal three-dimensional rotation driven by stepper motors topworkies respectively; Can also measure the angle signal of three-dimensional luminous target, be used for catching, following the tracks of of space luminescence target.
(3), digital optoelectronic angle sensor of the present invention not only can be measured the relative angle variation of luminous target; Realize the precision tracking of luminous target; And the present invention is through the suitable variation of control system structure and algorithm, and the absolute angle that can also measure luminous target changes.
For example, measure some longitudes and latitudes solar azimuth at a time on the earth.Preset an angle initial value to angular transducer, the angle that angular transducer is at a time detected adds this initial value, just can detect the absolute position of a certain moment sun.Angular transducer of the present invention since the mutual angle position relation of sensor and the sun can confirm through the presetting angle initial value, so do not need the adjustment of complicacy such as position of sun demarcation.
Further, if dispose convex lens at the optical window of sensor, the angle that can also within wideer angular range, measure incident light changes.
Adopt the line array CCD sensor array to describe in the foregoing description, but also can adopt photodiode array sensor etc. and line array CCD sensor can bring into play the linear photoconductor sensors of same purpose.
Angle of incidence of sunlight degree photoelectric measurement method and the digital optoelectronic angle sensor that is used for sun precision tracking of the present invention; Not only can be used for the Application of Solar Energy field; Like solar electrical energy generation, solar energy heating, solar energy drying etc.; Can also be used for the meteorological observation field, as following the tracks of in the meteorologic instruments such as radiometer, pyranometer.For example, digital optoelectronic angle sensor is configured in the tracking mode solar radiation table, can realizes the requirement real-time, quick, that accurately follow the tracks of of sun target.
Claims (4)
1. digital optoelectronic angle sensor that is used for sun precision tracking; Mainly comprise optical imagery unit, photodetection unit, information process unit, output interface unit and housing; It is characterized in that: described optical imagery unit is fixed on the front end of housing (6); This optical imagery unit is made up of trim ring (1), glass protecting cover (2), ring washer (3), neutral colour filter (4) and slit (5); Said slit (5) is bonded in the entrance pupil front of housing (6), and neutral colour filter (4), ring washer (3) and glass protecting cover (2) are fastened on the front end of slit (5) in regular turn through trim ring (1);
Described photodetection unit places the rear end of housing (6); The photodetection unit comprises spike interference filter (7), line array CCD (8) and link to each other in regular turn signal pre-processing circuit, automatic gain control circuit, high-speed a/d converter, first microprocessor (A); Said spike interference filter (7) is bonded on the housing (6); Line array CCD (8) is welded on the printed circuit board (9), and printed circuit board (9) is fixed on the step of housing (6); Said first microprocessor (A) adopts arm processor;
Described information process unit (11) comprises second microprocessor (B) and peripheral circuit, and information process unit (11) is fixed on the output interface unit (13), and output interface unit (13) are fixed on the bonnet (15), and bonnet (15) is fixed on the housing (6);
With the center line each other vertical installation of above-mentioned slit (5) center line with the one dimension pixel array of line array CCD (8), CCD pixel width is known a, and the distance on slit center line and CCD sensitization pixel surface is known H; The size of measurement of angle scope and the height of angular resolution are by the distance and the decision of CCD pixel number on slit and line array CCD (8) pixel surface;
Measuring slit (5) center line is N0 at the resulting pixel coding site of the lip-deep orthogonal projection of CCD pixel, and as the benchmark initial point, corresponding position of sun 1;
Measure when the sun runs to position 2, the incident ray of the sun is imaged onto on the CCD pixel surface through image-generating unit, obtains new pixel coding site N1;
Can be obtained by geometric relationship, the angle θ of sunshine off-vertical incident is:
When sun incident light is positioned at the left side of slit (5), promptly during N1＜N0, the incident angle θ that records is a negative value; When sun incident light is positioned at the right side of slit (5), promptly during N1＞N0, the incident angle θ that records on the occasion of.
2. the digital optoelectronic angle sensor that is used for sun precision tracking according to claim 1 is characterized in that: described slit (5) is an optical slot, is processed by machining or glass etch technique.
3. the digital optoelectronic angle sensor that is used for sun precision tracking according to claim 1 and 2; It is characterized in that: described slit (5) center line is vertical each other with the one dimension pixel center line of the line array CCD (8) of optical detection unit; And foundation takes measurement of an angle and the requirement of precision, confirms the distance and the CCD pixel number on slit and line array CCD pixel surface.
4. the digital optoelectronic angle sensor that is used for sun precision tracking according to claim 1 is characterized in that: described housing (6) is made up of lighttight material.
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| CN102223470A (en) * | 2011-06-13 | 2011-10-19 | 中国科学院西安光学精密机械研究所 | CCD camera image signal processing method and system |
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| CN103217141A (en) * | 2013-03-18 | 2013-07-24 | 大连宏海新能源发展有限公司 | Sun position detection device and method |
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