CN102854510A - High precision laser range finder - Google Patents
High precision laser range finder Download PDFInfo
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- CN102854510A CN102854510A CN2012102919971A CN201210291997A CN102854510A CN 102854510 A CN102854510 A CN 102854510A CN 2012102919971 A CN2012102919971 A CN 2012102919971A CN 201210291997 A CN201210291997 A CN 201210291997A CN 102854510 A CN102854510 A CN 102854510A
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Abstract
The invention provides a high precision laser range finder which comprises a laser transmitter, a laser receiver, a timer and a calculator, wherein the triggering end of the laser transmitter is coupled with a triggering switch and a trigger; the control end of the trigger is coupled with the laser receiver; the laser transmitter is further coupled with the timer; the timer begins to perform timing while the laser transmitter transmits the first laser pulse; the laser receiver is coupled with a counter; for each time that the laser receiver receives one reflection laser pulse, the counter counts for one time; the laser receiver transmits a timing stopping request to the timer through a gate switch; the gate switch is coupled with the counter; the counter releases the timing stopping request to the timer while counting to a set value; and at the same time the counter transmits a stopping receiving request to the laser receiver; and finally the tested range is calculated by the calculator. The laser range finder belongs to pulse type range finders; and not only can a range of a ground object in a long distance be measured, but also the precision is high.
Description
Technical field
The present invention relates to a kind of electronic measuring instrument, particularly, relate to a kind of pulse type laser stadimeter.
Background technology
Laser range finder is a kind of surveying instrument comparatively commonly used on engineering, because it is measured conveniently, therefore looked at by engineering survey personnel's parent.
Present laser range finder has two classes.The first kind is the pulse type laser stadimeter, during measurement, send a laser pulse by generating laser to target, after laser pulse is launched, received by laser pickoff, time that consumes back and forth of timer record laser pulse, according to the theory time-delay of the light velocity and electronic component, can obtain the distance of testee.Equations of The Second Kind is the continuous wave laser stadimeter, also be called the phase laser distance measurement instrument, when measuring, the stadimeter laser beam carries out frequency modulation (PFM) and measures light modulated coming and going the phase delay that survey line once produces, again according to modulation light wavelength, the distance of this phase delay representative that converts; Compare with the pulse type laser stadimeter, the emissive power of continuous wave laser stadimeter is lower, thereby it is relatively relatively poor to survey far distance capabilities, generally can only be applied in the precise distance measurement.
This shows, for the range observation between the ground object, as, the distance more than hundred meters can only adopt the pulse type laser stadimeter to find range usually.And the pulse type laser stadimeter is when work, because the time-delay of electronic component has error, to have influence on measuring accuracy, as, for various semiconductor devices, pressure, temperature, magnetic field, the variation of electric current, the capital affects its job stability, therefore, when semiconductor devices is worked, can produce a stochastic error that is difficult to overcome, usually, this stochastic error is-2% ~+2% (negative number representation real work parameter is less than theoretical parameter) with the ratio of theoretical parameter, for the higher components and parts of manufacture craft, its error also can be smaller, but that error should be thought about 0.5% is very accurate, and it will can not produce on the use of ordinary electronic equipment significantly impact.
Yet for laser range finder, this error effect is very large.Suppose that the pulse type laser stadimeter is when work, the time of laser pulse round trip between generating laser, target object, laser pickoff, that is the laser pulse flight time be t, the time-delay of the theory of stadimeter components and parts is t1, delay time error is Δ t, the error rate of then measuring is Δ t/(t+t1), because measuring distance is very small for the light velocity, as, measuring distance is about 1000m, and the light velocity then is 10
-- 8M/s, so, t ≈ 10-
-5S, and that the order of magnitude of the theory of components and parts time-delay t1 will be accomplished is less than the order of magnitude of t, very difficult, therefore, Δ t also is a numerical value that can not be ignored for t, consequent error rate Δ t/(t+t1) be larger.Generally speaking, for the pulse type laser stadimeter, its precision is generally about 5m, and is high-end then about 0.15m.This shows that the precision of pulse type laser stadimeter is necessary further raising, to satisfy the demand of accurately measuring.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of high-precision laser range-finding instrument, this laser range finder belongs to pulse distancemeter, not only can measure the ground object distance of long distance, and precision is very high.
The present invention solves the first technical scheme that its technical matters adopts: this high-precision laser range-finding instrument comprises generating laser, laser pickoff, timer, arithmetical unit; The trigger end of described generating laser is coupled with the trigger switch of a manual triggers and the trigger of an automatic triggering simultaneously; The control end of the described trigger described laser pickoff that is coupled when described laser pickoff receives the reflector laser pulse, is controlled described trigger and is sent trigger pip to generating laser; Described generating laser also is coupled with described timer; Described timer begins timing when generating laser sends first laser pulse; Counter of described laser pickoff coupling, and laser pickoff whenever receives a reflector laser pulse, first by described rolling counters forward once, sends a timing abort request through a door switch to described timer by laser pickoff again; The described door switch described counter that is coupled, and, described timing abort request is let pass to described timer during to setting value in rolling counters forward, simultaneously, described counter sends a terminating reception request to laser pickoff; After described timer was ended timing, described timer sum counter will be transferred to described arithmetical unit with institute's metering number between institute's timing, and calculates tested distance by arithmetical unit.
Described door switch is an AND circuit, an one input end described laser pickoff that is coupled, another input end described counter that is coupled; It is a high level that described timing stops request, and described rolling counters forward sends a high level to described door switch during to setting value, at this moment, makes this door switch send a high level to described timer, stops timing with the request timer.
As preferably, described counter counts from zero, and ends at a setting value, and this setting value can be regulated; Described setting value is not less than 10
2
Laser range finder provided by the invention triggers relation by the coupling between the electronic component when work, and laser pulse is equivalent to after coming back reflective repeatedly between stadimeter and the measured target just is timed once, and according to the tested distance of computing between institute's timing; So, be located in the one-shot measurement process, and rolling counters forward i time (generally speaking, i〉10
2), then the flight time t of laser pulse is significantly increased with respect to the laser pulse round trip, theoretical total time-delay t1 of stadimeter components and parts also significantly increases, and the time-delay total error Δ t=Δ t1+ Δ t2+ Δ t3+ of components and parts ... + Δ ti but obtains larger reducing with respect to the laser pulse round trip; According to theory of errors as can be known, when i → ∞, Δ t → 0 this shows, measuring error rate Δ t/(t+t1) will greatly reduce, thus significantly improve measuring accuracy; By mathematical relation as can be known, when i=10
NThe time, measuring accuracy will improve at least N order of magnitude.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples:
In the embodiment shown in fig. 1, this high-precision laser range-finding instrument comprises generating laser, laser pickoff, timer, arithmetical unit; The trigger end of described generating laser is coupled with the trigger switch of a manual triggers and the trigger of an automatic triggering simultaneously; The control end of the described trigger described laser pickoff that is coupled when described laser pickoff receives the reflector laser pulse, sends a signal to described trigger, impels described trigger to send trigger pip to generating laser; Described generating laser also is coupled with described timer; Described timer begins timing when generating laser sends first laser pulse; Counter of described laser pickoff coupling, and laser pickoff whenever receives a reflector laser pulse, first by described rolling counters forward once, sends a timing abort request through a door switch to described timer by laser pickoff again; The described door switch described counter that is coupled, and, described timing abort request is let pass to described timer during to setting value in rolling counters forward, simultaneously, described counter sends a terminating reception request to laser pickoff; After described timer was ended timing, described timer sum counter will be transferred to described arithmetical unit with institute's metering number between institute's timing, and calculates tested distance by arithmetical unit.
Described door switch can be an AND circuit, an one input end described laser pickoff that is coupled, another input end described counter that is coupled; It is a high level that described timing stops request, and described rolling counters forward sends a high level to described door switch during to setting value, then this moment, makes this door switch send a high level to described timer, stops timing with the request timer.
Described counter counts from zero, and ends at a setting value, and this setting value can be regulated; Described setting value is not less than 10
2, generally, this setting value is made as 10
3~ 10
4, reach already higher precision.
Above-mentioned high-precision laser range-finding instrument is when work, at first make described generating laser aim at measured target, then the described trigger switch of manual operation once, after this, trigger relation by the coupling between each electronic component, laser pulse is equivalent to after coming back reflective repeatedly between stadimeter and the measured target just is timed once, and according to the tested distance of computing between institute's timing; So, suppose in the one-shot measurement process, and rolling counters forward i time (generally speaking, i〉10
2), then the flight time t of laser pulse is significantly increased with respect to the laser pulse round trip, theoretical total time-delay t1 of stadimeter components and parts also significantly increases, and the time-delay total error Δ t=Δ t1+ Δ t2+ Δ t3+ of components and parts ... + Δ ti but obtains larger reducing with respect to the laser pulse round trip; According to theory of errors as can be known, when i → ∞, Δ t → 0 this shows, measuring error rate Δ t/(t+t1) will greatly reduce, thus significantly improve measuring accuracy; By mathematical relation as can be known, when i=10
NThe time, (t+t1) equal laser pulse round trip required time=10
N, and Δ t reduces, so measuring error rate Δ t/(t+t1) measuring error rate when being reduced at least the laser pulse round trip 1/10
N, namely measuring accuracy will improve at least N order of magnitude.
In tested distance operation process, the T.T. of establishing described timer record is t0, described rolling counters forward i time, theoretical total time-delay of electronic devices and components is t1, the time-delay total error of electronic component is Δ t, and the light velocity is c, then by described arithmetical unit calculate the testee distance L
T=(t0-t1) * c/ (2i); And the actual range L of testee
RShould equal (t0-t1-Δ t) * c/ (2i); Because i → and during ∞, Δ t → 0, so, during i → ∞, L
T→ L
R
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a high-precision laser range-finding instrument comprises generating laser, laser pickoff, timer, arithmetical unit; It is characterized in that: the trigger end of described generating laser is coupled with the trigger switch of a manual triggers and the trigger of an automatic triggering simultaneously; The control end of the described trigger described laser pickoff that is coupled when described laser pickoff receives the reflector laser pulse, is controlled described trigger and is sent trigger pip to generating laser; Described generating laser also is coupled with described timer; Described timer begins timing when generating laser sends first laser pulse; Counter of described laser pickoff coupling, and laser pickoff whenever receives a reflector laser pulse, first by described rolling counters forward once, sends a timing abort request through a door switch to described timer by laser pickoff again; The described door switch described counter that is coupled, and, described timing abort request is let pass to described timer during to setting value in rolling counters forward, simultaneously, described counter sends a terminating reception request to laser pickoff; After described timer was ended timing, described timer sum counter will be transferred to described arithmetical unit with institute's metering number between institute's timing, and calculates tested distance by arithmetical unit.
2. high-precision laser range-finding instrument according to claim 1, it is characterized in that: described door switch is an AND circuit, an one input end described laser pickoff that is coupled, another input end described counter that is coupled; It is a high level that described timing stops request, and described rolling counters forward sends a high level to described door switch during to setting value.
3. high-precision laser range-finding instrument according to claim 1, it is characterized in that: described counter counts from zero, and ends at a setting value, and this setting value can be regulated.
4. high-precision laser range-finding instrument according to claim 3, it is characterized in that: described setting value is not less than 10
2
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| CN2012102919971A CN102854510A (en) | 2012-08-16 | 2012-08-16 | High precision laser range finder |
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| CN2012102919971A CN102854510A (en) | 2012-08-16 | 2012-08-16 | High precision laser range finder |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116163A (en) * | 2013-01-29 | 2013-05-22 | 东南大学 | Laser sense-and-response distance measuring device and control method |
| CN103529454A (en) * | 2013-11-06 | 2014-01-22 | 中国科学院上海天文台 | Multi-telescope laser ranging system and method |
| CN107003408A (en) * | 2014-12-02 | 2017-08-01 | 欧都思影像公司 | Distance measuring equipment and the method for determining distance |
| CN108196245A (en) * | 2018-02-01 | 2018-06-22 | 常州机电职业技术学院 | Design method of laser range finder calibration platform |
| CN110375652A (en) * | 2019-08-28 | 2019-10-25 | 合肥工业大学 | The long range multiple degrees of freedom laser measurement system of beam stability can be improved |
| US10557703B2 (en) | 2014-11-21 | 2020-02-11 | Rockwell Automation Limited | Distance measuring device and method for determining a distance |
| CN112558097A (en) * | 2020-11-23 | 2021-03-26 | Oppo（重庆）智能科技有限公司 | Electronic device, control method of electronic device, and computer-readable storage medium |
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| US4770526A (en) * | 1985-11-13 | 1988-09-13 | Messerschmitt-Boelkow-Blohm Gmbh | Ranging method and apparatus |
| JPH0346589A (en) * | 1989-07-13 | 1991-02-27 | Mitsubishi Electric Corp | Distance measuring device |
| US20020041370A1 (en) * | 2000-08-17 | 2002-04-11 | Pi-Yao Chien | Laser range signal processing method and device |
| CN1448728A (en) * | 2002-03-29 | 2003-10-15 | 蔡成 | Laser range finding method and apparatus |
-
2012
- 2012-08-16 CN CN2012102919971A patent/CN102854510A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4770526A (en) * | 1985-11-13 | 1988-09-13 | Messerschmitt-Boelkow-Blohm Gmbh | Ranging method and apparatus |
| JPH0346589A (en) * | 1989-07-13 | 1991-02-27 | Mitsubishi Electric Corp | Distance measuring device |
| US20020041370A1 (en) * | 2000-08-17 | 2002-04-11 | Pi-Yao Chien | Laser range signal processing method and device |
| CN1448728A (en) * | 2002-03-29 | 2003-10-15 | 蔡成 | Laser range finding method and apparatus |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116163A (en) * | 2013-01-29 | 2013-05-22 | 东南大学 | Laser sense-and-response distance measuring device and control method |
| CN103116163B (en) * | 2013-01-29 | 2015-02-04 | 东南大学 | Laser sense-and-response distance measuring device and control method |
| CN103529454A (en) * | 2013-11-06 | 2014-01-22 | 中国科学院上海天文台 | Multi-telescope laser ranging system and method |
| US10557703B2 (en) | 2014-11-21 | 2020-02-11 | Rockwell Automation Limited | Distance measuring device and method for determining a distance |
| CN107003408A (en) * | 2014-12-02 | 2017-08-01 | 欧都思影像公司 | Distance measuring equipment and the method for determining distance |
| CN107003408B (en) * | 2014-12-02 | 2019-08-16 | 欧都思影像公司 | Distance measuring equipment and the method for determining distance |
| US10401483B2 (en) | 2014-12-02 | 2019-09-03 | Odos Imaging Ltd. | Distance measuring device and method for determining a distance |
| CN108196245A (en) * | 2018-02-01 | 2018-06-22 | 常州机电职业技术学院 | Design method of laser range finder calibration platform |
| CN110375652A (en) * | 2019-08-28 | 2019-10-25 | 合肥工业大学 | The long range multiple degrees of freedom laser measurement system of beam stability can be improved |
| CN112558097A (en) * | 2020-11-23 | 2021-03-26 | Oppo（重庆）智能科技有限公司 | Electronic device, control method of electronic device, and computer-readable storage medium |
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Application publication date: 20130102 |