CN211954620U - Optical axis consistency measuring system of high-power pulse laser range finder - Google Patents
Optical axis consistency measuring system of high-power pulse laser range finder Download PDFInfo
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- CN211954620U CN211954620U CN202020625854.XU CN202020625854U CN211954620U CN 211954620 U CN211954620 U CN 211954620U CN 202020625854 U CN202020625854 U CN 202020625854U CN 211954620 U CN211954620 U CN 211954620U
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Abstract
The utility model relates to a laser rangefinder, concretely relates to high power pulse laser rangefinder optical axis uniformity measurement system based on scattering sample. The utility model aims at solving current high power pulse laser range finder optical axis uniformity measurement system and having the technical problem that uses the limitation to wide band laser optical axis uniformity measurement, provide a high power pulse laser range finder optical axis uniformity measurement system. 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.
Description
Technical Field
The utility model relates to a laser rangefinder, concretely relates to high power pulse laser rangefinder optical axis uniformity measurement system based on scattering sample.
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 utility model aims at solving current high power pulse laser range finder optical axis uniformity measurement system and having the technical problem that uses the limitation to wide band laser optical axis uniformity measurement, provide a high power pulse laser range finder optical axis uniformity measurement system based on scattering sample.
In order to solve the technical problem, the utility model provides a technical solution as follows:
the utility model provides a high power pulse laser range finder optical axis uniformity measurement system, its special character lies in: 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.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model discloses in the transmission optical axis and receiving optical axis uniformity measurement to high power pulse laser range finder, the off-axis parabolic mirror mainly plays the effect of convergent laser and collimation emission simulation 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 the optical axis consistency measuring system of the high power pulse laser distance measuring machine of 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;
the utility model discloses in:
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 present invention will be further described with reference to the accompanying drawings.
The utility model provides a high power pulse laser range finder optical axis uniformity measurement system, as shown in figure 2, comprising 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 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
The analog laser 7 is a semiconductor laser with the wavelength of 1.064um, and the power instability of the analog laser is 3% after the analog laser continuously works for 2 hours; the working spectrum of the CCD detector 6 is 0.4um-1.1um, and the frame frequency is 200Hz at most.
The method for measuring the consistency of the optical axis of the high-power pulse laser range finder by using the system 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 equally replace some technical features of the embodiments, and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (7)
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: 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 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 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020625854.XU CN211954620U (en) | 2020-04-23 | 2020-04-23 | Optical axis consistency measuring system of high-power pulse laser range finder |
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| CN202020625854.XU CN211954620U (en) | 2020-04-23 | 2020-04-23 | Optical axis consistency measuring system of high-power pulse laser range finder |
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| CN211954620U true CN211954620U (en) | 2020-11-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111442911A (en) * | 2020-04-23 | 2020-07-24 | 中国科学院西安光学精密机械研究所 | System and method for measuring consistency of optical axes of high-power pulse laser range finder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111442911A (en) * | 2020-04-23 | 2020-07-24 | 中国科学院西安光学精密机械研究所 | System and method for measuring consistency of optical axes of high-power pulse laser range finder |
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