CN111442911A - System and method for measuring consistency of optical axes of high-power pulse laser range finder - Google Patents
System and method for measuring consistency of optical axes of high-power pulse laser range finder Download PDFInfo
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- CN111442911A CN111442911A CN202010327382.4A CN202010327382A CN111442911A CN 111442911 A CN111442911 A CN 111442911A CN 202010327382 A CN202010327382 A CN 202010327382A CN 111442911 A CN111442911 A CN 111442911A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000005337 ground glass Substances 0.000 claims abstract description 34
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 238000004088 simulation Methods 0.000 claims abstract description 17
- 239000005338 frosted glass Substances 0.000 claims abstract description 3
- 238000001228 spectrum Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000002238 attenuated effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/04—Optical benches therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
Abstract
The invention relates to a laser range finder, in particular to a system and a method for measuring consistency of an optical axis of a high-power pulse laser range finder based on scattering sampling. The invention aims to solve the technical problem that the use of the existing system and method for measuring the consistency of the optical axis of the high-power pulse laser range finder is limited, and provides a system and method for measuring the consistency of the optical axis of the high-power pulse laser range finder. The system comprises an off-axis parabolic mirror, a folding axis mirror, ground glass, a sampling mirror, a convergent lens, a CCD detector, a simulation laser and a target switching guide rail; the folding axis mirror and the frosted glass are sequentially arranged on a converging light path of the off-axis parabolic mirror; the sampling mirror, the convergent lens and the CCD detector are sequentially arranged on a collimating light path of the off-axis parabolic mirror; the simulation laser and the ground glass are both arranged on the target switching guide rail, and the target switching guide rail passes through the focus of the off-axis parabolic mirror reflected by the folding shaft mirror. The method is carried out by using the system.
Description
Technical Field
The invention relates to a laser range finder, in particular to a system and a method for measuring consistency of an optical axis of a high-power pulse laser range finder based on scattering sampling.
Background
The high-power pulse laser range finder is important equipment for realizing long-distance accurate range finding. The method is mainly applied to space target monitoring in the field of aerospace, and plays an important role in improving target track measurement accuracy, forecasting capability, cataloguing accuracy and the like. In the field of aviation, a photoelectric load system which is carried on an airborne pod or a small ball has been developed into a complex photoelectric detection system which integrates visible light, laser and infrared light, and a laser ranging system (namely a high-power pulse laser range finder) plays an important role in ensuring the detection capability of the airborne photoelectric load and realizing high-precision distance detection and accurate positioning.
How to assemble and detect the consistency (namely parallelism) between the optical axis of the laser transmitting antenna and the optical axis of the laser receiving antenna of the laser ranging system ensures that the consistency deviation of the transmitting optical axis and the receiving optical axis reaches the allowable minimum range, and is an important factor influencing the ranging precision of high-power pulse laser.
At present, a commonly used method for measuring the consistency of the optical axis of a high-power pulse laser range finder is a conjugate focal plane method, the principle of which is shown in fig. 1, high-power pulse laser emitted by a measured high-power pulse laser range finder 06 is converged by an off-axis parabolic mirror 01, transmitted by a spectroscope 02 and attenuated by an attenuation sheet 03 to reach the focal plane of a CCD detector 04, and the CCD detector 04 extracts the centroid of a laser spot through software and marks the laser spot as an emission optical axis coordinate; the simulated laser 05 with a specific wavelength is reflected by the spectroscope 02 arranged at the focus of the off-axis parabolic mirror 01, is collimated by the off-axis parabolic mirror 01 and then is received by a detector of the high-power pulse laser range finder 06 to be measured, and the centroid of a laser spot is extracted and marked as the coordinate of a receiving optical axis. Because the spectroscope is arranged, the two focal planes of the off-axis parabolic mirror 01 are in a conjugate relation, and the consistency of the optical axis of the CCD detector 04 and the optical axis of the simulated laser 05 is ensured, therefore, the consistency deviation of the transmitting optical axis and the receiving optical axis of the measured high-power pulse laser range finder 06 can be calculated according to the marked centroid coordinates.
The measuring method has the advantages that the measuring equipment is simple in structural form, and has the disadvantages that serious use limitations exist, which are specifically expressed as follows: firstly, the conjugate focal plane method is realized on the basis of plating a special dielectric film on the spectroscope 02, the dielectric film can only aim at the high-power pulse laser range finder 06 with a specific single-point wavelength, and the accurate measurement of other high-power pulse laser range finders 06 in a wide spectrum range cannot be realized; secondly, most of high-power pulse laser emitted by the measured high-power pulse laser range finder 06 can reach megawatt level, and reaches the focal plane of the CCD detector 04 after being converged by the off-axis parabolic mirror 01, the power density will increase in geometric magnitude, so that the high-power laser must be sufficiently attenuated to protect the photosensitive element of the CCD detector 04 from being damaged by the high-power pulse laser, and the attenuation sheet 03 used here cannot realize high suppression ratio attenuation of the wide-spectrum laser.
Disclosure of Invention
The invention aims to solve the technical problem that the use of the consistency measurement of the optical axis of the wide-spectrum laser is limited in the conventional system and method for measuring the consistency of the optical axis of the high-power pulse laser range finder, and provides a system and method for measuring the consistency of the optical axis of the high-power pulse laser range finder based on scattering sampling.
In order to solve the technical problems, the technical solution provided by the invention is as follows:
the invention provides a system for measuring the consistency of an optical axis of a high-power pulse laser range finder, which is characterized in that: the device comprises an off-axis parabolic mirror, a folding axis mirror, ground glass, a sampling mirror, a convergent lens, a CCD detector, a simulation laser and a target switching guide rail;
the folding axis mirror and the frosted glass are sequentially arranged on a converging light path of the off-axis parabolic mirror;
the sampling mirror, the convergent lens and the CCD detector are sequentially arranged on a collimating light path of the off-axis parabolic mirror;
the simulation laser and the ground glass are both arranged on the target switching guide rail, and the target switching guide rail can enable the simulation laser and the ground glass to respectively be positioned at the focus of the off-axis parabolic mirror by moving on the target switching guide rail through the focus of the off-axis parabolic mirror reflected by the folding shaft mirror.
Further, the off-axis parabolic mirror has a focal length of 1000mm and an effective clear aperture of
Further, the effective light-passing aperture of the folding axis mirror is
Further, the surface of the ground glass is plated with a strong laser damage resistant film, and the laser damage resistant threshold value is more than or equal to 300MW/cm2。
Further, the effective clear aperture of the ground glass is
Further, the simulated laser is a semiconductor laser with the wavelength of 1.064um, and the power instability of the simulated laser in continuous operation for 2 hours is 3%.
Furthermore, the working spectrum of the CCD detector is 0.4um-1.1um, and the frame frequency is 200Hz at most.
The invention also provides a method for measuring the consistency of the optical axis by using the system for measuring the consistency of the optical axis of the high-power pulse laser range finder, which is characterized by comprising the following steps:
1) measuring the position of the coordinates of the emission optical axis
The method comprises the following steps that (1) ground glass is placed at the focus of an off-axis parabolic mirror reflected by a folding shaft mirror by a target switching guide rail, high-power pulse laser emitted by a measured high-power pulse laser range finder is converged by the off-axis parabolic mirror and reflected by the folding shaft mirror to reach the ground glass, the ground glass attenuates and scatters the high-power pulse laser, a small part of scattered laser enters a CCD (charge coupled device) detector after being reflected by the folding shaft mirror, collimated by the off-axis parabolic mirror, sampled and reflected by a sampling mirror and transmitted by a converging lens, and the incident laser is converged at the focal plane of the CCD detector by the CCD detector, the mass center of a converged light spot;
2) measuring the position of the coordinates of the receiving optical axis
The simulated laser is switched to the focus of the off-axis parabolic mirror reflected by the folding shaft mirror by utilizing the target switching guide rail, the simulated laser is received by a detector carried by a receiving antenna of the measured high-power pulse laser range finder after being reflected by the folding shaft mirror and collimated by the off-axis parabolic mirror, the detector converges the incident laser to the focal plane of the detector, the mass center of a converged light spot is extracted, and the converged light spot is marked as the coordinate position of a receiving optical axis;
3) calculating the deviation of the consistency of the transmitting optical axis and the receiving optical axis
And calculating the consistency deviation of the transmitting optical axis and the receiving optical axis of the measured high-power pulse laser range finder by using the coordinate position of the transmitting optical axis obtained in the step 1) and the coordinate position of the receiving optical axis obtained in the step 2).
Compared with the prior art, the invention has the following beneficial effects:
1. in the consistency measurement of the transmitting optical axis and the receiving optical axis of the high-power pulse laser range finder, the off-axis parabolic mirror mainly plays the roles of converging laser and collimating and transmitting simulated laser; the folding axial mirror is used for folding the light path, so that the overall dimension of the test equipment is reduced; the ground glass plays a role in attenuating and scattering high-power laser; the sampling mirror is used for receiving and transmitting scattered high-power laser; the converging lens is used for converging the received scattered high-power laser; the CCD detector has the function of imaging the sampled high-power laser; the simulation laser device plays a role of providing simulation laser for the measured high-power pulse laser range finder; the target switching guide rail plays a role in switching the focal plane target of the off-axis paraboloid collimator. The ground glass is adopted to realize scattering sampling with the attenuation function, and a spectroscope plated with a special dielectric film used in the conventional optical axis consistency measurement by a conjugate focal plane method is not needed, so that the method is not limited to a specific single-point wavelength, and has wider applicability, namely, the consistency precision measurement of a wide-spectrum laser emission optical axis and a wide-spectrum laser receiving optical axis is realized.
2. Because the ground glass with the attenuation function and the scattering sampling is adopted, an attenuation device is not required to be arranged in front of the CCD detector, and the development cost of the measuring equipment is reduced.
3. Due to the adoption of the ground glass with the attenuation function and the scattering sampling, the high-power pulse laser emitted by the high-power pulse laser range finder cannot be directly converged on the focal plane of the CCD detector, so that the CCD detector is effectively protected, and the service life of the CCD detector is prolonged.
4. The surface of the ground glass is plated with a strong laser damage resistant film, and the laser damage resistant threshold value is more than or equal to 300MW/cm2And the laser ranging device can bear high-power laser emitted by a high-power pulse laser ranging machine to be measured.
5. The simulated laser is a semiconductor laser with the wavelength of 1.064um, the power instability is 3% after continuous working for 2 hours, and a stable laser simulated light source is provided for the high-power pulse laser range finder to be measured.
6. The work spectrum of the CCD detector is 0.4um-1.1um, the frame frequency is 200Hz at most, and the detection of the low-frequency high-power pulse laser of the high-power pulse laser range finder to be detected can be realized.
Drawings
FIG. 1 is a system for measuring the optical axis consistency of a high-power pulse laser distance measuring machine by a conjugate focal plane method;
FIG. 2 is a system for measuring the optical axis consistency of a high-power pulsed laser range finder according to the scattering sampling method of the present invention;
description of reference numerals:
in the prior art:
01-off-axis parabolic mirror; 02-a spectroscope; 03-an attenuation sheet; 04-CCD detector; 05-analog laser; 06-measured high power pulse laser range finder;
in the invention:
1-off-axis parabolic mirror; 2-a folding axial lens; 3-ground glass; 4-a sampling mirror; 5-a converging lens; 6-CCD detector; 7-analog laser; 8-target switching guide rail; 9-measured high power pulse laser range finder.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
The invention provides a system for measuring the consistency of an optical axis of a high-power pulse laser range finder, which comprises an off-axis parabolic mirror 1, a folding axis mirror 2, ground glass 3, a sampling mirror 4, a convergent lens 5, a CCD detector 6, a simulation laser 7 and a target switching guide rail 8, wherein the off-axis parabolic mirror 2 is arranged on the upper surface of the sampling mirror; the folding axis mirror 2 and the ground glass 3 are sequentially arranged on a convergent light path of the off-axis parabolic mirror 1; the sampling mirror 4, the convergent lens 5 and the CCD detector 6 are sequentially arranged on a collimating light path of the off-axis parabolic mirror 1; the simulation laser 7 and the ground glass 3 are both arranged on the target switching guide rail 8, and the target switching guide rail 8 can enable the simulation laser 7 and the ground glass 3 to respectively be positioned at the focus of the off-axis parabolic mirror 1 by moving on the target switching guide rail 8 through the focus of the off-axis parabolic mirror 1 reflected by the folding axis mirror 2.
The off-axis parabolic mirror 1 has a focal length of 1000mm and an effective clear aperture of
The effective light-passing aperture of the folding axial lens 2 is
The surface of the ground glass 5 is uniformly plated with a strong laser damage resistant film, and the laser damage resistant threshold value is more than or equal to 300MW/cm2The effective clear aperture of the ground glass 5 is
Simulation ofThe laser 7 is a semiconductor laser with the wavelength of 1.064um, and the power instability of the laser in continuous working for 2 hours is 3 percent; the working spectrum of the CCD detector 6 is 0.4um-1.1um, and the frame frequency is 200Hz at most.
The invention also provides a method for measuring the consistency of the optical axis of the high-power pulse laser range finder by using the system, which comprises the following steps:
1) measuring the position of the coordinates of the emission optical axis
The ground glass 3 is placed at the focus of the off-axis parabolic mirror 1 reflected by the folding axis mirror 2 by using a target switching guide rail 8, high-power pulse laser emitted by a measured high-power pulse laser range finder 9 is converged by the off-axis parabolic mirror 1 and reflected by the folding axis mirror 2 to reach the ground glass 3, the ground glass 3 attenuates and scatters the high-power pulse laser, a small part of scattered laser enters the CCD detector 6 after being reflected by the folding axis mirror 2, collimated by the off-axis parabolic mirror 1, sampled and reflected by the sampling mirror 4 and transmitted by the converging lens 5, the incident laser is converged at the focal plane of the CCD detector 6 by the CCD detector 6, the centroid of a converged light spot is extracted, and the centroid of the converged light spot is marked as an emission optical axis coordinate;
2) measuring the position of the coordinates of the receiving optical axis
A target switching guide rail 8 is utilized to switch a simulation laser 7 to the focus of the off-axis parabolic mirror 1 reflected by the folding axis mirror 2, the simulation laser is reflected by the folding axis mirror 2 and is received by a detector carried by a receiving antenna of the measured high-power pulse laser range finder 9 after being collimated by the off-axis parabolic mirror 1, the detector converges the incident laser to the focal plane of the detector, the mass center of a converged light spot is extracted, and the converged light spot is marked as the coordinate position of a receiving optical axis;
3) calculating the deviation of the consistency of the transmitting optical axis and the receiving optical axis
And calculating the consistency deviation of the transmitting optical axis and the receiving optical axis of the measured high-power pulse laser range finder by using the coordinate position of the transmitting optical axis obtained in the step 1) and the coordinate position of the receiving optical axis obtained in the step 2).
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (8)
1. The utility model provides a high power pulse laser range finder optical axis uniformity measurement system which characterized in that: the device comprises an off-axis parabolic mirror (1), a folding axis mirror (2), ground glass (3), a sampling mirror (4), a convergent lens (5), a CCD detector (6), a simulation laser (7) and a target switching guide rail (8);
the folding axis mirror (2) and the frosted glass (3) are sequentially arranged on a convergent light path of the off-axis parabolic mirror (1);
the sampling mirror (4), the convergent lens (5) and the CCD detector (6) are sequentially arranged on a collimating light path of the off-axis parabolic mirror (1);
the simulation laser (7) and the ground glass (3) are arranged on the target switching guide rail (8), the target switching guide rail (8) can enable the simulation laser (7) and the ground glass (3) to move on the target switching guide rail (8) through the focus of the off-axis parabolic mirror (1) reflected by the folding axis mirror (2), and the simulation laser and the ground glass are respectively located at the focus of the off-axis parabolic mirror (1).
2. The system for measuring the consistency of the optical axes of the high-power pulse laser range finder according to claim 1, characterized in that: the focal length of the off-axis parabolic mirror (1) is 1000mm, and the effective clear aperture is
3. The system for measuring the consistency of the optical axes of the high-power pulse laser range finder according to claim 1, characterized in that: the effective light-passing caliber of the folding axial lens (2) is
4. The method of claim 1The high power pulse laser range finder optical axis uniformity measurement system which characterized in that: the surface of the ground glass (3) is plated with a strong laser damage resistant film, and the laser damage resistant threshold value is more than or equal to 300MW/cm2。
5. The system for measuring the optical axis consistency of the high-power pulse laser range finder according to claim 4, characterized in that: the effective clear aperture of the ground glass (3) is
6. The system for measuring the consistency of the optical axes of the high-power pulse laser range finder according to claim 1, characterized in that: the simulated laser (7) is a semiconductor laser with the wavelength of 1.064um, and the power instability of the simulated laser in continuous operation for 2 hours is 3%.
7. The system for measuring the consistency of the optical axes of the high-power pulse laser range finder according to claim 1, characterized in that: the working spectrum of the CCD detector (6) is 0.4um-1.1um, and the frame frequency is 200Hz at most.
8. A method for measuring the optical axis consistency by using the optical axis consistency measuring system of the high power pulse laser range finder as claimed in any one of claims 1 to 7, comprising the steps of:
1) measuring the position of the coordinates of the emission optical axis
The ground glass (3) is placed at the focus of an off-axis parabolic mirror (1) reflected by a folding axis mirror (2) by utilizing a target switching guide rail (8), high-power pulse laser emitted by a measured high-power pulse laser range finder (9) is converged by the off-axis parabolic mirror (1) and reflected by the folding axis mirror (2) to reach the ground glass (3), the high-power pulse laser is attenuated and scattered by the ground glass (3), a small part of scattered laser is reflected by the folding axis mirror (2), collimated by the off-axis parabolic mirror (1), sampled and reflected by a sampling mirror (4), transmitted by a converging lens (5) and enters a CCD detector (6), the CCD detector (6) converges incident laser to the focal plane of the CCD detector (6), the mass center of a converged light spot is extracted, and the mass center is marked as an emission optical axis coordinate;
2) measuring the position of the coordinates of the receiving optical axis
A target switching guide rail (8) is utilized to switch a simulated laser (7) to the focus of the off-axis parabolic mirror (1) reflected by the folding axis mirror (2), the simulated laser is reflected by the folding axis mirror (2) and is received by a detector carried by a receiving antenna of the measured high-power pulse laser range finder (9) after being collimated by the off-axis parabolic mirror (1), the detector converges the incident laser to the focal plane of the detector, the mass center of a converged light spot is extracted, and the converged light spot is marked as the coordinate position of a receiving optical axis;
3) calculating the deviation of the consistency of the transmitting optical axis and the receiving optical axis
And calculating the consistency deviation of the transmitting optical axis and the receiving optical axis of the measured high-power pulse laser range finder (9) by using the coordinate position of the transmitting optical axis obtained in the step 1) and the coordinate position of the receiving optical axis obtained in the step 2).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112539847A (en) * | 2020-11-04 | 2021-03-23 | 中国科学院上海光学精密机械研究所 | Large-caliber ultrashort pulse sampling device |
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| CN102819014A (en) * | 2012-07-23 | 2012-12-12 | 北京理工大学 | Optical system for testing laser distance measurer performance based on off-axis parabolic mirror |
| US20160025960A1 (en) * | 2012-09-10 | 2016-01-28 | Francis Theberge | Telescopic control of high power laser propagation |
| CN108444410A (en) * | 2018-06-20 | 2018-08-24 | 湖北三江航天红峰控制有限公司 | Convergent laser emits optical axis and tracking optical axis parallelism measuring apparatus and method |
| CN109374261A (en) * | 2018-11-22 | 2019-02-22 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of multi-light axis consistency detection device and method based on target switching |
| CN211954620U (en) * | 2020-04-23 | 2020-11-17 | 中国科学院西安光学精密机械研究所 | Optical axis consistency measuring system of high-power pulse laser range finder |
-
2020
- 2020-04-23 CN CN202010327382.4A patent/CN111442911A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102819014A (en) * | 2012-07-23 | 2012-12-12 | 北京理工大学 | Optical system for testing laser distance measurer performance based on off-axis parabolic mirror |
| US20160025960A1 (en) * | 2012-09-10 | 2016-01-28 | Francis Theberge | Telescopic control of high power laser propagation |
| CN108444410A (en) * | 2018-06-20 | 2018-08-24 | 湖北三江航天红峰控制有限公司 | Convergent laser emits optical axis and tracking optical axis parallelism measuring apparatus and method |
| CN109374261A (en) * | 2018-11-22 | 2019-02-22 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of multi-light axis consistency detection device and method based on target switching |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112539847A (en) * | 2020-11-04 | 2021-03-23 | 中国科学院上海光学精密机械研究所 | Large-caliber ultrashort pulse sampling device |
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