Single photon laser ranging system's visual axis parallel light machine installation method

Abstract

The present application relates to the field of optical machine adjustment, and particularly relates to a kind of single-photon laser ranging system's visual axis collimator adjustment method, first 45 ° reflector and second 45 ° reflector are sequentially adjusted to the preset position on tooling bottom plate, and the normal relationship of one face of first 45 ° reflector, second 45 ° reflector and high-precision autocollimator is calibrated;Single-photon laser emission end and single-photon laser receiving end are respectively adjusted to the preset position on the ranging system bottom plate, the normal relationship of reference surface of single-photon laser emission end and single-photon laser receiving end and high-precision autocollimator is calibrated, and the normal relationship of the other face of first 45 ° reflector, second 45 ° reflector and high-precision autocollimator is calibrated.The optical machine adjustment method can reach the adjustment accuracy requirement of single-photon laser ranging system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of optical mechanical adjustment, and particularly relates to a line-of-sight parallel optical mechanical adjustment method for a single-photon laser ranging system. BACKGROUND

[0002] The existing laser ranging system comprises a laser transmitting end and a laser receiving end. A traditional line-of-sight parallel optical mechanical adjustment method for the laser transmitting end and the laser receiving end is to measure the span between the laser transmitting end and the laser receiving end (i.e. the distance between the center of the laser transmitting end and the center of the laser receiving end), draw the span on a target paper to form a straight line, fix the target paper with the straight line on a target plate, irradiate the target paper by the laser transmitting end to form a light spot on the target paper, adjust the angle of the laser transmitting end to align the light spot with one end point of the straight line, and adjust the angle of the laser receiving end to align the laser receiving end with the other end point of the straight line, so as to realize the line-of-sight parallel of the laser transmitting end and the laser receiving end. Since the area of the light spot is much larger than that of the end point of the straight line, the adjustment precision of the line-of-sight parallel optical mechanical adjustment method is limited.

[0003] With the accelerated development of scientific undertakings in China, the single-photon laser ranging system is increasingly widely applied in the fields of aviation, aerospace and national defense. In recent years, the single-photon laser ranging system has made remarkable progress in the fields of optical measurement and laser radar due to its high sensitivity and precision. The single-photon ranging system realizes long-distance and high-resolution distance measurement by accurately detecting the time required by a single photon in the propagation process. Compared with conventional laser ranging methods, the single-photon ranging system has obvious advantages.

[0004] However, the adjustment precision of the traditional line-of-sight parallel optical mechanical adjustment method for the laser transmitting end and the laser receiving end cannot meet the adjustment precision requirement of the single-photon laser ranging system. SUMMARY

[0005] Therefore, the present application aims to provide a line-of-sight parallel optical mechanical adjustment method for a single-photon laser ranging system to solve the technical problem that the traditional line-of-sight parallel optical mechanical adjustment method cannot meet the adjustment precision requirement of the single-photon laser ranging system.

[0006] To achieve the above-mentioned purpose, the technical solution of the present application is as follows:

[0007] The application discloses a collimator adjustment method for a visual axis of a single-photon laser ranging system, and the device used in the adjustment process comprises a high-precision autocollimator, a mirror tooling base plate, a first 45-degree mirror, a second 45-degree mirror, a plane mirror, a vernier caliper and a height gauge, the single-photon laser ranging system comprises a ranging system base plate, a single-photon laser transmitting end and a single-photon laser receiving end, a surface parallel to the optical axis of the single-photon laser transmitting end of the first 45-degree mirror is defined as a first calibration surface, a surface perpendicular to the optical axis of the single-photon laser transmitting end of the first 45-degree mirror is defined as a second calibration surface, and an inclined surface of the first 45-degree mirror is defined as a reflecting surface; a surface parallel to the optical axis of the single-photon laser receiving end of the second 45-degree mirror is defined as a third calibration surface, a surface perpendicular to the optical axis of the single-photon laser receiving end of the second 45-degree mirror is defined as a fourth calibration surface, and an inclined surface of the second 45-degree mirror is defined as a reflecting surface; the collimator adjustment method for the visual axis of the single-photon laser ranging system comprises calibration between the first 45-degree mirror and the second 45-degree mirror and calibration between the single-photon laser transmitting end and the single-photon laser receiving end; wherein,

[0008] The calibration process between the first 45-degree mirror and the second 45-degree mirror comprises the following steps:

[0009] The second 45-degree mirror is adjusted to a preset position on the tooling base plate by using the vernier caliper and the height gauge, the third calibration surface of the second 45-degree mirror is calibrated to be perpendicular to the optical axis of the high-precision autocollimator by using the high-precision autocollimator and the plane mirror, the first 45-degree mirror is adjusted to a preset position on the tooling base plate by using the vernier caliper and the height gauge, the first calibration surface of the first 45-degree mirror is calibrated to be perpendicular to the optical axis of the high-precision autocollimator by using the high-precision autocollimator and the plane mirror, the reflecting surfaces of the first 45-degree mirror and the second 45-degree mirror are perpendicular to each other, and the first 45-degree mirror and the second 45-degree mirror are fixed on the tooling base plate at this time;

[0010] The calibration process between the single-photon laser transmitting end and the single-photon laser receiving end comprises the following steps:

[0011] The single-photon laser emitting end and the single-photon laser receiving end are respectively installed and adjusted to preset positions on the bottom plate of the ranging system by using a vernier caliper and a height gauge, the reference surface of the single-photon laser emitting end and the optical axis of the high-precision autocollimator are calibrated to be perpendicular by using the high-precision autocollimator and a plane mirror, the tooling bottom plate for fixing the first 45° mirror and the second 45° mirror is moved to a position between the high-precision autocollimator and the bottom plate of the ranging system, the second calibration surface of the first 45° mirror and the optical axis of the high-precision autocollimator are calibrated to be perpendicular by using the high-precision autocollimator and the plane mirror, the tooling bottom plate for fixing the first 45° mirror and the second 45° mirror is removed, the reference surface of the single-photon laser receiving end and the optical axis of the high-precision autocollimator are calibrated to be perpendicular by using the high-precision autocollimator and the plane mirror, and the single-photon laser emitted by the single-photon laser emitting end is received by the single-photon laser receiving end after being reflected by the first 45° mirror and the second 45° mirror, and the energy is maximum.

[0012] Further, based on the optical axis of the single-photon laser receiving end, the second 45° mirror is installed and adjusted to a preset position on the tooling bottom plate by using a vernier caliper and a height gauge, the high-precision autocollimator is aligned to the third calibration surface of the second 45° mirror, the plane mirror is fixed on the third calibration surface of the second 45° mirror, the plane mirror is adjusted so that the third calibration surface of the second 45° mirror is perpendicular to the optical axis of the high-precision autocollimator, the high-precision autocollimator is kept fixed, based on the optical axis of the single-photon laser emitting end, the first 45° mirror is installed and adjusted to a preset position on the tooling bottom plate by using a vernier caliper and a height gauge, the plane mirror is fixed on the first calibration surface of the first 45° mirror, the plane mirror is adjusted so that the first calibration surface of the first 45° mirror is perpendicular to the optical axis of the high-precision autocollimator, and the reflecting surfaces of the first 45° mirror and the second 45° mirror are perpendicular at this time.

[0013] Further, based on design requirements, the single-photon laser emitting end and the single-photon laser receiving end are respectively installed and adjusted to the preset positions on the bottom plate of the ranging system by using the vernier caliper and the height gauge, the high-precision autocollimator is aligned to the reference surface of the single-photon laser emitting end, the plane mirror is fixed on the reference surface of the single-photon laser emitting end, the plane mirror is adjusted so that the reference surface of the single-photon laser emitting end is perpendicular to the optical axis of the high-precision autocollimator, the tooling bottom plate for fixing the first 45° mirror and the second 45° mirror is moved to the position between the high-precision autocollimator and the bottom plate of the ranging system, the plane mirror is fixed on the second calibration surface of the first 45° mirror, the position of the plane mirror is adjusted so that the second calibration surface of the first 45° mirror is perpendicular to the optical axis of the high-precision autocollimator, the tooling bottom plate for fixing the first 45° mirror and the second 45° mirror is removed, the high-precision autocollimator is aligned to the reference surface of the single-photon laser receiving end, the plane mirror is fixed on the reference surface of the single-photon laser receiving end, and the plane mirror is adjusted so that the reference surface of the single-photon laser receiving end is perpendicular to the optical axis of the high-precision autocollimator, at this time, the single photon emitted by the single-photon laser emitting end is received by the single-photon laser receiving end after being reflected by the first 45° mirror and the second 45° mirror and has the maximum energy.

[0014] Further, the high-precision autocollimator is a Leica theodolite with an autocollimation function.

[0015] Compared with the prior art, the application can achieve the following beneficial effects:

[0016] The application uses the high-precision autocollimator, the mirror tooling bottom plate, the first 45° mirror, the second 45° mirror, the plane mirror, the vernier caliper and the height gauge to realize the installation and adjustment of the single-photon ranging system collimation axis parallel light machine, and has high installation and adjustment accuracy, thereby meeting the installation and adjustment accuracy requirement of the single-photon laser ranging system. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated herein in their entirety. The application illustratively described in these drawings is discussed in conjunction with related information in order to provide a general appreciation of the application. In the drawings:

[0018] Figure 1a and Figure 1b are respectively schematic diagrams of a calibration process between the second 45° mirror and the first 45° mirror according to the embodiments of the application;

[0019] Figures 2a-2c are respectively schematic diagrams of a calibration process between the single-photon laser emitting end and the single-photon laser receiving end according to the embodiments of the application;

[0020] Figure 3 is a schematic diagram of a single-photon ranging system after the collimation of the visual axis is completed according to the inventive embodiment.

[0021] The reference signs are explained as follows: high-precision autocollimation device 1, mirror tooling bottom plate 2, first 45° mirror 3, second 45° mirror 4, plane mirror 5, ranging system bottom plate 6, single-photon laser transmitting end 7, and single-photon laser receiving end 8. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation on the present invention.

[0023] It should be noted that the embodiments in the present invention and the features in the embodiments can be combined with each other without conflict.

[0024] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0026] The present invention will be described in detail below with reference to Figures 1a-3 and in conjunction with the embodiments.

[0027] This invention provides a method for assembling and adjusting the line-of-sight collimator of a single-photon laser ranging system. The apparatus used in the assembly and adjustment process includes a high-precision autocollimator 1, a reflector fixture base plate 2, a first 45° reflector 3, a second 45° reflector 4, a plane reflector 5, a vernier caliper, and a height gauge. The assembled and adjusted single-photon laser ranging system includes a ranging system base plate 6, a single-photon laser transmitter 7, and a single-photon laser receiver 8.

[0028] For ease of description, the following definitions are made: the surface of the first 45° reflector 3 parallel to the optical axis of the single-photon laser emitter 7 is defined as the first calibration surface; the surface of the first 45° reflector 3 perpendicular to the optical axis of the single-photon laser emitter 7 is defined as the second calibration surface; and the inclined surface of the first 45° reflector 3 is defined as the reflecting surface. The surface of the second 45° reflector 4 parallel to the optical axis of the single-photon laser receiver 8 is defined as the third calibration surface; the surface of the second 45° reflector 4 perpendicular to the optical axis of the single-photon laser receiver 8 is defined as the fourth calibration surface; and the inclined surface of the second 45° reflector 4 is defined as the reflecting surface.

[0029] The alignment method of the line-of-sight collimator of the single-photon laser ranging system includes the calibration between the first 45° reflector 3 and the second 45° reflector 4, as well as the calibration between the single-photon laser transmitter 7 and the single-photon laser receiver 8. The calibration process between the first 45° reflector 3 and the second 45° reflector 4, and the calibration process between the single-photon laser transmitter 7 and the single-photon laser receiver 8 are described in detail below with reference to the accompanying drawings.

[0030] like Figure 1a and Figure 1b As shown, the calibration process between the first 45° reflector 3 and the second 45° reflector 4 includes:

[0031] Step 1: Based on the optical axis height when the single-photon laser receiver 8 is installed on the ranging system base plate 6, use a height gauge to adjust the second 45° reflector to the preset position on the tooling base plate 2, and use the high-precision autocollimator 1 and the plane reflector 5 to calibrate the third calibration surface of the second 45° reflector 4 and the optical axis of the high-precision autocollimator 1 to be perpendicular.

[0032] Specifically, the high-precision autocollimator 1 is aligned with the third calibration surface of the second 45° reflector 4, the plane reflector 5 is fixed to the third calibration surface of the second 45° reflector 4, and the plane reflector 5 is adjusted so that the third calibration surface of the second 45° reflector 4 is perpendicular to the optical axis of the high-precision autocollimator 1, thereby calibrating the third calibration surface of the second 45° reflector 4 and the optical axis of the high-precision autocollimator 1 to be perpendicular.

[0033] After completing the calibration of the third calibration surface of the second 45° reflector 4, keep the high-precision autocollimation device 1 fixed.

[0034] Second step: according to the height of the optical axis when the single-photon laser receiving end 8 is installed on the ranging system base plate 6, the first 45° mirror 3 is installed on the preset position of the tool base plate 2 by using the vernier caliper and the height gauge, and the first calibration surface of the first 45° mirror 3 and the optical axis of the high-precision autocollimator device 1 are calibrated to be perpendicular by using the high-precision autocollimator device 1 and the plane mirror 5.

[0035] Specifically, the plane mirror 5 is fixed on the first calibration surface of the first 45° mirror 3, and the plane mirror 5 is adjusted so that the first calibration surface of the first 45° mirror 3 is perpendicular to the optical axis of the high-precision autocollimator device 1, thereby calibrating the first calibration surface of the first 45° mirror 3 and the optical axis of the high-precision autocollimator device 1 to be perpendicular.

[0036] When the first calibration surface of the first 45° mirror 3 is perpendicular to the optical axis of the high-precision autocollimator device 1, and the third calibration surface of the second 45° mirror 4 is perpendicular to the optical axis of the high-precision autocollimator device 1, the reflecting surface of the first 45° mirror 3 is perpendicular to the reflecting surface of the second 45° mirror 4.

[0037] The second 45° mirror 4 far away from the high-precision autocollimator device 1 is calibrated first, and then the first 45° mirror 3 close to the high-precision autocollimator device 1 is calibrated. If the first 45° mirror 3 is calibrated first, the first 45° mirror 3 will block the second 45° mirror 4, and the high-precision autocollimator device 1 cannot calibrate the second 45° mirror 4.

[0038] Third step: the first 45° mirror 3 and the second 45° mirror 4 with perpendicular reflecting surfaces are fixed on the tool base plate 2.

[0039] At this time, the first 45° mirror 3, the second 45° mirror 4 and the tool base plate 2 are as a whole.

[0040] As shown in Figure 2a and Figure 2c the calibration process between the single-photon laser transmitting end and the single-photon laser receiving end, comprising:

[0041] First step: according to the design requirements, the single-photon laser transmitting end 7 and the single-photon laser receiving end 8 are installed on the preset position of the ranging system base plate 6 by using the vernier caliper and the height gauge, and the reference surface of the single-photon laser transmitting end 7 and the optical axis of the high-precision autocollimator device 1 are calibrated to be perpendicular by using the high-precision autocollimator device 1 and the plane mirror 5.

[0042] Specifically, the high-precision autocollimator 1 is aligned to the reference surface of the single-photon laser emitter 7, the plane mirror 5 is fixed to the reference surface of the single-photon laser emitter 7, and the plane mirror 5 is adjusted so that the reference surface of the single-photon laser emitter 7 is perpendicular to the optical axis of the high-precision autocollimator 1, thereby calibrating the reference surface of the single-photon laser emitter 7 to be perpendicular to the optical axis of the high-precision autocollimator 1.

[0043] Step 2: Move the tooling base plate 2 that fixes the first 45° mirror 3 and the second 45° mirror 4 to a position between the high-precision autocollimator 1 and the ranging system base plate 6.

[0044] Step 3: Calibrate the second calibration surface of the first 45° mirror 3 to be perpendicular to the optical axis of the high-precision autocollimator 1 by using the high-precision autocollimator 1 and the plane mirror 5.

[0045] After the reference surface of the single-photon laser emitter 7 is calibrated to be perpendicular to the optical axis of the high-precision autocollimator 1, the high-precision autocollimator 1 is kept fixed, and after the tooling base plate 2 is moved to a position between the high-precision autocollimator 1 and the ranging system base plate 6, the plane mirror 5 is fixed to the second calibration surface of the first 45° mirror 3, and at this time, adjusting the tooling base plate 2 is equivalent to adjusting the plane mirror 5, so that the second calibration surface of the first 45° mirror 3 is perpendicular to the optical axis of the high-precision autocollimator 1, thereby calibrating the second calibration surface of the first 45° mirror 3 to be perpendicular to the optical axis of the high-precision autocollimator 1.

[0046] Step 4: Remove the tooling base plate 2 that fixes the first 45° mirror 3 and the second 45° mirror 4, and calibrate the reference surface of the single-photon laser receiver 8 to be perpendicular to the optical axis of the high-precision autocollimator 1 by using the high-precision autocollimator 1 and the plane mirror 5.

[0047] Specifically, the high-precision autocollimator 1 is moved to align to the reference surface of the single-photon laser receiver 8, the plane mirror 5 is fixed to the reference surface of the single-photon laser receiver 8, and the plane mirror 5 is adjusted so that the reference surface of the single-photon laser receiver 8 is perpendicular to the optical axis of the high-precision autocollimator 1, thereby calibrating the reference surface of the single-photon laser receiver 8 to be perpendicular to the optical axis of the high-precision autocollimator 1.

[0048] When the second calibration surface of the first 45° mirror 3, the reference surface of the single-photon laser emitter 7, and the reference surface of the single-photon laser receiver 8 are all perpendicular to the optical axis of the high-precision autocollimator 1, it is ensured that the single photons emitted by the single-photon laser emitter 7 are received by the single-photon laser receiver 8 after being reflected by the first 45° mirror 3 and the second 45° mirror 4 (as shown in FIG. 4). Figure 3The light energy received by the single-photon laser receiving end 8 is the largest, which indicates that the visual axis of the single-photon laser transmitting end 7 is parallel to the visual axis of the single-photon laser receiving end 8, and the visual axis parallel light machine adjustment of the single-photon laser transmitting end 7 and the single-photon laser receiving end 8 is completed.

[0049] After the visual axis parallel light machine adjustment of the single-photon laser transmitting end 7 and the single-photon laser receiving end 8 is completed, the tooling bottom plate 2 for fixing the first 45° reflector 3 and the second 45° reflector 4 is removed.

[0050] The high-precision autocollimator equipment adopts a Leica theodolite with an autocollimator function. The Leica theodolite has high precision, and ensures that the visual axis parallel light machine adjustment of the single-photon ranging system meets the adjustment precision requirements of the single-photon laser ranging system.

[0051] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present disclosure can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present disclosure can be achieved, and the present disclosure is not limited herein.

[0052] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for assembling and adjusting a line-of-sight collimator in a single-photon laser ranging system, wherein the apparatus used in the assembly and adjustment process includes a high-precision autocollimator, a reflector fixture base plate, a first 45° reflector, a second 45° reflector, a plane reflector, a vernier caliper, and a height gauge; the single-photon laser ranging system includes a ranging system base plate, a single-photon laser transmitter, and a single-photon laser receiver; the surface of the first 45° reflector parallel to the optical axis of the single-photon laser transmitter is defined as a first calibration surface; the surface of the first 45° reflector perpendicular to the optical axis of the single-photon laser transmitter is defined as a second calibration surface; and the inclined surface of the first 45° reflector is defined as a reflecting surface; the surface of the second 45° reflector parallel to the optical axis of the single-photon laser receiver is defined as a third calibration surface; the surface of the second 45° reflector perpendicular to the optical axis of the single-photon laser receiver is defined as a fourth calibration surface; and the inclined surface of the second 45° reflector is defined as a reflecting surface; characterized in that... The collimation method of the visual axis of the single-photon laser ranging system comprises calibration between the first 45° reflector and the second 45° reflector and calibration between the single-photon laser transmitting end and the single-photon laser receiving end. The calibration process between the first 45° reflector and the second 45° reflector comprises: The second 45° reflector is adjusted to a preset position on the tooling bottom plate by using a vernier caliper and a height gauge, the third calibration surface of the second 45° reflector is calibrated to be perpendicular to the optical axis of the high-precision autocollimator by using the high-precision autocollimator and a plane mirror, the first 45° reflector is adjusted to a preset position on the tooling bottom plate by using a vernier caliper and a height gauge, the first calibration surface of the first 45° reflector is calibrated to be perpendicular to the optical axis of the high-precision autocollimator by using the high-precision autocollimator and a plane mirror, and the reflecting surfaces of the first 45° reflector and the second 45° reflector are perpendicular to each other, and at this time, the first 45° reflector and the second 45° reflector are fixed on the tooling bottom plate. The calibration process between the single-photon laser transmitting end and the single-photon laser receiving end comprises: The single-photon laser transmitting end and the single-photon laser receiving end are respectively adjusted to preset positions on the ranging system bottom plate by using a vernier caliper and a height gauge, the reference surface of the single-photon laser transmitting end is calibrated to be perpendicular to the optical axis of the high-precision autocollimator by using the high-precision autocollimator and a plane mirror, the tooling bottom plate for fixing the first 45° reflector and the second 45° reflector is moved to a position between the high-precision autocollimator and the ranging system bottom plate, the second calibration surface of the first 45° reflector is calibrated to be perpendicular to the optical axis of the high-precision autocollimator by using the high-precision autocollimator and a plane mirror, the tooling bottom plate for fixing the first 45° reflector and the second 45° reflector is removed, the reference surface of the single-photon laser receiving end is calibrated to be perpendicular to the optical axis of the high-precision autocollimator by using the high-precision autocollimator and a plane mirror, and the single photon emitted by the single-photon laser transmitting end is received by the single-photon laser receiving end after being reflected by the first 45° reflector and the second 45° reflector, and the energy is maximum.

2. The method of collimating the line of sight of a single-photon laser ranging system according to claim 1, wherein, Based on the optical axis of the single-photon laser receiving end, the second 45° reflector is adjusted to a preset position on the tooling bottom plate by using a vernier caliper and a height gauge, the high-precision autocollimator is aligned with the third calibration surface of the second 45° reflector, the plane mirror is fixed on the third calibration surface of the second 45° reflector, the plane mirror is adjusted so that the third calibration surface of the second 45° reflector is perpendicular to the optical axis of the high-precision autocollimator, the high-precision autocollimator is kept fixed, based on the optical axis of the single-photon laser transmitting end, the first 45° reflector is adjusted to a preset position on the tooling bottom plate by using a vernier caliper and a height gauge, the plane mirror is fixed on the first calibration surface of the first 45° reflector, and the plane mirror is adjusted so that the first calibration surface of the first 45° reflector is perpendicular to the optical axis of the high-precision autocollimator, and at this time, the reflecting surfaces of the first 45° reflector and the second 45° reflector are perpendicular to each other.

3. The method of collimating the line of sight of a single-photon laser ranging system according to claim 1, wherein, Based on design requirements, the single photon laser emitting end and the single photon laser receiving end are respectively installed and adjusted to the preset positions on the bottom plate of the ranging system by using a vernier caliper and a height gauge, the high-precision autocollimator is aligned to the reference surface of the single photon laser emitting end, the plane mirror is fixed on the reference surface of the single photon laser emitting end, the plane mirror is adjusted so that the reference surface of the single photon laser emitting end is perpendicular to the optical axis of the high-precision autocollimator, the high-precision autocollimator is kept fixed, the tooling bottom plate for fixing the first 45° mirror and the second 45° mirror is moved to the position between the high-precision autocollimator and the bottom plate of the ranging system, the plane mirror is fixed on the second calibration surface of the first 45° mirror, the position of the plane mirror is adjusted so that the second calibration surface of the first 45° mirror is perpendicular to the optical axis of the high-precision autocollimator, the tooling bottom plate for fixing the first 45° mirror and the second 45° mirror is removed, the high-precision autocollimator is aligned to the reference surface of the single photon laser receiving end, the plane mirror is fixed on the reference surface of the single photon laser receiving end, the plane mirror is adjusted so that the reference surface of the single photon laser receiving end is perpendicular to the optical axis of the high-precision autocollimator, at this time, the single photon emitted by the single photon laser emitting end is received by the single photon laser receiving end after being reflected by the first 45° mirror and the second 45° mirror and the energy is maximum.

4. The method of collimating the line of sight of a single-photon laser ranging system according to claim 1, wherein, The high-precision autocollimator is a Leica theodolite with an autocollimation function.

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