CN101539424B - Nighttime imaging cloud-height measuring method - Google Patents
Nighttime imaging cloud-height measuring method Download PDFInfo
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- CN101539424B CN101539424B CN2009103019865A CN200910301986A CN101539424B CN 101539424 B CN101539424 B CN 101539424B CN 2009103019865 A CN2009103019865 A CN 2009103019865A CN 200910301986 A CN200910301986 A CN 200910301986A CN 101539424 B CN101539424 B CN 101539424B
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Abstract
A nighttime imaging cloud-height measuring method comprises the steps of: 1. arranging an image collector and a laser source respectively at a certain interval and leading lens optical axis of the image collector and optical axis of the laser source to be vertical to the horizontal plane; 2. opening the laser source and simultaneously adopting the image collector to collect imaging plane of a laser beam; 3. respectively selecting the focus of the image collector as B, the launching point of the laser source as C and the top point of laser beam as A; and selecting one point on the lens opticalaxis of the image collector as E and leading the line section between the point A and the point E to be parallel with the line section between the point B and the point C; and respectively finding subpoint A' of point A and subpoint E' of E on the imaging plane and measuring the distance A'E' between the subpoint A' and the subpoint E'; and 4. calculating cloud-height according to a formula: AC equals E'B multiplied by BC/A'E'. The method has the advantages of simple measuring steps and accurate measuring result. The nighttime imaging cloud-height measuring method can solve the cloud-height measurement with lower cost and is applicable to cloud-height measurement of various cloud layers.
Description
Technical field
The present invention relates to a kind of measuring method of the cloud level, particularly a kind of method of measuring the cloud level at night.
Background technology
The cloud level is meant the vertical range of cloud base to ground.The measurement of the cloud level is significant for aerospace field, is the important referential data of spacecraft lift-off.Traditional cloud level measurement mechanism has lamps behind a curtain, infrared cloud detection instrument, laser ceilometer etc.Wherein lamps behind a curtain can only be applied to the high measurement of stratiform clouds stratus, and limitation is bigger.The advantage of laser ceilometer is the accuracy height, uses rapid and convenient, and shortcoming is that cost is higher, can only carry out the sky single-point cloud level and measure.The method of utilizing the Infrared survey cloud level is to adopt the Infrared survey device that the atmosphere infrared radiation is measured, and its measuring method is comparatively complicated, and accuracy is difficult to hold, and the cost of infrared rays survey device is higher equally.
Summary of the invention
The invention provides a kind of nighttime imaging cloud-height measuring method, solve the technical matters of measuring the cloud level with lower cost, simpler method.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of nighttime imaging cloud-height measuring method is characterized in that:
Step 1: the segment distance of being separated by is provided with an image acquisition device and a LASER Light Source respectively, and makes the camera lens optical axis of image acquisition device all vertical with surface level with the optical axis of LASER Light Source.
Step 2: open LASER Light Source, gather the imaging plane of laser light beam simultaneously with image acquisition device.
Step 3: the focus of choosing image acquisition device is B, the launching site of LASER Light Source is C, the summit of laser light beam is A, on the camera lens optical axis of image acquisition device, get 1 E, make the line segment that the A point is ordered to E be parallel to the line segment that the B point is ordered to C, find on the imaging plane A point at subpoint A ' on the imaging plane and E point the subpoint E ' on imaging plane, amount is calculated the distance A between E ' point and the A ' point ' E '.
Step 4: calculate the cloud level according to AC=E ' B * BC/A ' E ', wherein E ' B is the focal length of image acquisition device, and BC is the distance between image acquisition device and the LASER Light Source.
Can be 200～800 meters apart from BC between described image acquisition device and the LASER Light Source.
Described image acquisition device can be visible images collector or infreared imaging device.
Described visible images collector can be camera or video camera.
Beneficial effect of the present invention is as follows:
The present invention has adopted an image acquisition device and a LASER Light Source, both are separated by a distance, take the laser light beam that LASER Light Source is sent with image acquisition device then, to calculate A be the cloud level to the distance on ground to principle by plane geometry again, have measuring method, measuring process is simple, measurement result is advantage accurately.Device structure used in the present invention is simple, only an image acquisition device of need and a LASER Light Source are cheap, have solved the problems of measurement of the cloud level with lower cost, and the cloud level that is applicable to various cloud layers measures, and can be widely used in fields such as Aeronautics and Astronautics, meteorology.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the synoptic diagram of step 1 of the present invention and step 2.
Fig. 2 is the synoptic diagram of step 3 of the present invention and step 4.
1-image acquisition device, 2-LASER Light Source, 3-cloud base, 4-imaging plane, 5-laser light beam.
Embodiment
Embodiment is referring to Fig. 1, Fig. 2, and this nighttime imaging cloud-height measuring method the steps include:
Step 1: the segment distance of being separated by is provided with an image acquisition device 1 and a LASER Light Source 2 respectively, and makes the camera lens optical axis of image acquisition device 1 all vertical with surface level with the optical axis of LASER Light Source 2.
Step 2: open LASER Light Source 2, gather the imaging plane 4 of laser light beam 5 simultaneously with image acquisition device 1.
Step 3: the focus of choosing image acquisition device 1 is B, the launching site of LASER Light Source 2 is C, the summit of laser light beam is A, on the camera lens optical axis of image acquisition device 1, get 1 E, make the line segment that the A point is ordered to E be parallel to the line segment that the B point is ordered to C, on imaging plane 4, find the A point at subpoint A ' on the imaging plane and E point the subpoint E ' on imaging plane, amount is calculated the distance A between E ' point and the A ' point ' E '.
Step 4: calculate the cloud level according to AC=E ' B * BC/A ' E ', wherein E ' B is the focal length of image acquisition device 1, and BC is the distance between image acquisition device 1 and the LASER Light Source 2.
Described image acquisition device 1 is visible images collector or infreared imaging device, general visible images collector can be selected camera or video camera etc., present embodiment adopts camera, the camera lens optical axis of camera is vertical with surface level, establish LASER Light Source 2 at distance camera certain distance, LASER Light Source 2 is BC with the distance of camera, and the summit A of described laser light beam is the intersection point of laser light beam 5 and cloud base 3 just, so AC is the cloud level.General LASER Light Source 2 is 200～800 meters with camera apart from BC, present embodiment is chosen 500 meters, the relation of the summit A of the laser light beam that provides according to Fig. 2 and A ' in imaging plane again, BC/A ' E '=AC/E ' B, E ' B is that focal length is known, BC is known, and A ' E ' can record from photo, so cloud level AC=E ' B * BC/A ' E '.
Claims (4)
1. nighttime imaging cloud-height measuring method is characterized in that:
Step 1: the segment distance of being separated by is provided with an image acquisition device (1) and a LASER Light Source (2) respectively, and makes the camera lens optical axis of image acquisition device (1) all vertical with surface level with the optical axis of LASER Light Source (2);
Step 2: open LASER Light Source (2), use image acquisition device (1) to gather the imaging plane (4) of laser light beam (5) simultaneously;
Step 3: the focus of choosing image acquisition device (1) is B, the launching site of LASER Light Source (2) is C, the summit of laser light beam is A, on the camera lens optical axis of image acquisition device (1), get 1 E, make the line segment that the A point is ordered to E be parallel to the line segment that the B point is ordered to C, on imaging plane (4), find the A point at subpoint A ' on the imaging plane and E point the subpoint E ' on imaging plane, amount is calculated the distance A between E ' point and the A ' point ' E ';
Step 4: calculate the cloud level according to AC=E ' B * BC/A ' E ', wherein E ' B is the focal length of image acquisition device (1), and BC is the distance between image acquisition device (1) and the LASER Light Source (2).
2. nighttime imaging cloud-height measuring method according to claim 1 is characterized in that: between described image acquisition device (1) and the LASER Light Source (2) is 200～800 meters apart from BC.
3. nighttime imaging cloud-height measuring method according to claim 1 and 2 is characterized in that: described image acquisition device (1) is visible images collector or infreared imaging device.
4. nighttime imaging cloud-height measuring method according to claim 3 is characterized in that: described visible images collector is camera or video camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103019865A CN101539424B (en) | 2009-04-29 | 2009-04-29 | Nighttime imaging cloud-height measuring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009103019865A CN101539424B (en) | 2009-04-29 | 2009-04-29 | Nighttime imaging cloud-height measuring method |
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| CN101539424A CN101539424A (en) | 2009-09-23 |
| CN101539424B true CN101539424B (en) | 2010-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106871764A (en) * | 2017-02-28 | 2017-06-20 | 成都金盘电子科大多媒体技术有限公司 | A kind of space length measuring method based on medical image |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103185567B (en) * | 2011-12-27 | 2015-04-29 | 联想(北京)有限公司 | Electronic apparatus and method for measuring distance |
| CN104406569B (en) * | 2014-12-05 | 2017-03-29 | 中国气象局气象探测中心 | Radiation brightness and the photogrammetric height of cloud base measuring system for combining and method |
| JP7386136B2 (en) * | 2020-07-03 | 2023-11-24 | 株式会社日立製作所 | Cloud height measurement device, measurement point determination method, and cloud type determination method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3963347A (en) * | 1974-05-09 | 1976-06-15 | American Optical Corporation | Erbium laser ceilometer |
| US4106872A (en) * | 1977-03-09 | 1978-08-15 | Asea Aktiebolag | Cloud altitude measuring apparatus and method |
| US4355893A (en) * | 1980-09-08 | 1982-10-26 | Sanders Associates, Inc. | Eye-safe laser cloud height rangefinder |
| US4605302A (en) * | 1983-04-18 | 1986-08-12 | Asea Aktiebolag | Cloud height measuring device with compensation for window fouling |
| US4643564A (en) * | 1982-10-15 | 1987-02-17 | Asea Aktiebolag | Cloud height measuring means |
| CN1670479A (en) * | 2004-03-15 | 2005-09-21 | 清华大学 | Method for measuring aircraft flight elevation based on video images |
| CN201152899Y (en) * | 2007-12-03 | 2008-11-19 | 凯迈（洛阳）测控有限公司 | Multi-azimuth pitching measurement apparatus for laser ceilometer |
-
2009
- 2009-04-29 CN CN2009103019865A patent/CN101539424B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3963347A (en) * | 1974-05-09 | 1976-06-15 | American Optical Corporation | Erbium laser ceilometer |
| US4106872A (en) * | 1977-03-09 | 1978-08-15 | Asea Aktiebolag | Cloud altitude measuring apparatus and method |
| US4355893A (en) * | 1980-09-08 | 1982-10-26 | Sanders Associates, Inc. | Eye-safe laser cloud height rangefinder |
| US4643564A (en) * | 1982-10-15 | 1987-02-17 | Asea Aktiebolag | Cloud height measuring means |
| US4605302A (en) * | 1983-04-18 | 1986-08-12 | Asea Aktiebolag | Cloud height measuring device with compensation for window fouling |
| CN1670479A (en) * | 2004-03-15 | 2005-09-21 | 清华大学 | Method for measuring aircraft flight elevation based on video images |
| CN201152899Y (en) * | 2007-12-03 | 2008-11-19 | 凯迈（洛阳）测控有限公司 | Multi-azimuth pitching measurement apparatus for laser ceilometer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106871764A (en) * | 2017-02-28 | 2017-06-20 | 成都金盘电子科大多媒体技术有限公司 | A kind of space length measuring method based on medical image |
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| CN101539424A (en) | 2009-09-23 |
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