CN-224216282-U - Laser radar lens testing device

CN224216282UCN 224216282 UCN224216282 UCN 224216282UCN-224216282-U

Abstract

The invention provides a testing device of a laser radar lens, which is a transmitting end lens or a receiving end lens, and comprises a light source, a reference plane, an imaging module and a position detection module, wherein the light source is configured to transmit test light to the laser radar lens, the reference plane is fixedly arranged relative to the laser radar lens and is used for calibrating the position of a light emitting surface or a light sensing surface corresponding to the laser radar lens, the imaging module is configured to be at least movable to a first set position and a second set position along the optical axis of the laser radar lens, the first set position is the position when the imaging module images the test light focused by the laser radar lens, the second set position is the position when the imaging module images the reference plane, and the position detection module is configured to acquire the coordinates of the first set position and the second set position. Thus, through the testing device provided by the embodiment of the disclosure, the common test of the defocusing amount and the focal length of the laser radar lens can be effectively realized, and the hardware cost and the process cost are reduced.

Inventors

YE WENWEI
XIA JIAHUI

Assignees

上海禾赛科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250523

Claims (10)

1. The device for testing the laser radar lens is characterized in that the laser radar lens is a transmitting end lens or a receiving end lens, wherein the transmitting end lens is used for guiding a detection beam emitted by a light emitting surface of the laser radar to the outside of the laser radar, and the receiving end lens is used for guiding an echo beam generated after the detection beam is reflected on an object to a light sensing surface in the laser radar; the test device comprises: A light source configured to emit test light to the lidar lens; The reference plane is fixedly arranged relative to the laser radar lens and is used for calibrating the position of a luminous surface or a photosensitive surface corresponding to the laser radar lens; The imaging module is configured to be at least movable to a first set position and a second set position along the optical axis of the laser radar lens, wherein the first set position is a position when the imaging module images the test light focused by the laser radar lens, and the second set position is a position when the imaging module images the reference plane; and the position detection module is configured to acquire coordinates of the first setting position and the second setting position.
2. The test device of claim 1, further comprising a rail, the imaging module being slidably mounted on the rail.
3. The test device of claim 2, wherein the rail comprises a first rail having a length along an optical axis of the lidar lens and a second rail slidably coupled to the first rail, wherein the imaging module is slidably mounted to the first rail, and wherein the length of the second rail intersects the length of the first rail.
4. The test device of claim 1, wherein the reference plane is a bearing surface of the lidar lens, and the bearing surface is a surface of the lidar lens for fixing a corresponding light emitting surface or light sensing surface.
5. The testing device according to any one of claims 1-4, further comprising a calibration plate detachably fixed between the lidar lens and the imaging module, wherein the calibration plate comprises a first surface and a second surface which are parallel, and the first surface and the second surface are arranged based on a preset interval; The imaging module can also move to a third set position, wherein the third set position is a position when the imaging module images the second surface; the position detection module is further configured to obtain coordinates of the third set position.
6. The test device of claim 5, wherein the imaging module comprises an autocollimator.
7. The test device according to any one of claims 1-4, wherein the imaging module comprises an imaging unit; The test device further includes a displacement sensor fixed to the imaging unit, the displacement sensor configured to detect the reference plane.
8. The test device of claim 7, wherein the displacement sensor is a contact displacement sensor or a non-contact displacement sensor.
9. The test device according to any one of claims 1 to 4, wherein, The imaging module comprises an autocollimator or an imaging unit and an abutting surface fixed relative to the autocollimator or the imaging unit, wherein the autocollimator or the imaging unit can image the abutting surface, and the abutting surface is used for abutting against the reference plane.
10. The test device of claim 9, wherein the imaging module further comprises a target fixture, the target fixture is fixedly connected with the autocollimator or the imaging unit, and a surface of the target fixture facing away from the autocollimator or the imaging unit is the abutment surface.

Description

Laser radar lens testing device Technical Field The disclosure relates to the technical field of lidar, in particular to a testing device of a lidar lens. Background In recent years, with the rapid development of automatic driving and intelligent traffic technology, the laser radar is used as an important environment sensing sensor, and the performance and the accuracy requirements are higher and higher. One of the core components of a lidar system is an optical lens, whose accurate measurement of parameters is critical to ensuring the performance of the overall system. Some lidar systems widely use single photon avalanche diode (single photon avalanche diode, SPAD) detectors. In a SPAD-based lidar system, the coupling efficiency of the optical system is a key parameter that affects ranging capability, signal stability, multi-field calibration accuracy, and the like. The defocusing amount of the optical lens has a remarkable influence on the coupling efficiency, and the larger defocusing amount can reduce the coupling efficiency, further influence the remote measurement capability of the system, and cause the change of a position energy curve, so that the calibration of performance parameters such as the reflectivity of different fields of view is difficult. At the same time, the focal length is also critical, which has a significant impact on the viewing angle range and imaging definition of the optical lens. To ensure the performance of the lidar system, the defocus amount and focal length of the lidar optical lens need to be precisely measured and managed. Therefore, a measuring system capable of rapidly and accurately detecting the defocus amount and the focal length of the laser radar needs to be designed aiming at a special lens of the laser radar. The matters in the background section are only those known to the inventors of the present disclosure and do not, of course, represent prior art in the field. Disclosure of utility model Accordingly, an object of the present disclosure is to provide a testing device for a laser radar lens, which can effectively realize a common test for defocus and focal length of the laser radar lens, and ensure quality of the laser radar optical lens. The invention provides a testing device of a laser radar lens, which is a transmitting end lens or a receiving end lens, wherein the transmitting end lens is used for guiding a detection beam emitted by a light emitting surface of the laser radar to the outside of the laser radar, and the receiving end lens is used for guiding an echo beam generated after the detection beam is reflected on an object to a light sensing surface in the laser radar; the test device comprises: A light source configured to emit test light to the lidar lens; The reference plane is fixedly arranged relative to the laser radar lens and is used for calibrating the position of a luminous surface or a photosensitive surface corresponding to the laser radar lens; The imaging module is configured to be at least movable to a first set position and a second set position along the optical axis of the laser radar lens, wherein the first set position is a position when the imaging module images the test light focused by the laser radar lens, and the second set position is a position when the imaging module images the reference plane; and the position detection module is configured to acquire coordinates of the first setting position and the second setting position. Optionally, the imaging module further comprises a rail, and the imaging module is slidingly assembled on the rail. Optionally, the track comprises a first track with the length direction along the optical axis of the laser radar lens and a second track in sliding connection with the first track, wherein the imaging module is assembled to the first track in a sliding manner, and the length direction of the second track is intersected with the length direction of the first track. Optionally, the reference plane is a bearing surface of the laser radar lens, and the bearing surface is a surface of the laser radar lens for fixing a corresponding light emitting surface or light sensing surface. Optionally, the laser radar imaging device further comprises a calibration plate, wherein the calibration plate is detachably fixed between the laser radar lens and the imaging module, and comprises a first surface and a second surface which are parallel, wherein the first surface and the second surface are arranged based on a preset interval; The imaging module can also move to a third set position, wherein the third set position is a position when the imaging module images the second surface; the position detection module is further configured to obtain coordinates of the third set position. Optionally, the imaging module comprises an autocollimator. Optionally, the imaging module comprises an imaging unit; The test device further includes a displacement sensor fixed to the imaging unit, the displacement sensor