Method and device for adjusting light output axis of laser ranging system

Abstract

The present invention provides a method and device for adjusting the light output optical axis of a laser ranging system, and belongs to the field of laser ranging technology. The light output optical axis adjustment method includes: a visible light source emits a visible light beam to a reflector, so that the visible light beam is reflected by the reflector to the exit point of the visible light source, wherein the light spot of the visible light beam on the reflector coincides with the positive projection of the geometric center of the center hole on the reflector; the reflector is unloaded, and a collimator is installed in the center hole of the condenser; the laser emits a light beam, and the light beam is emitted through the optical axis of the collimator; the optical axis inclination angle of the collimator is adjusted so that the light spot of the light beam emitted by the laser is located within a preset range centered on the exit point of the visible light source. The light output optical axis adjustment method and device of the laser ranging system provided by the present invention can improve the adjustment accuracy of the collimator, reduce the angle between the output light of the laser ranging system and the optical axis of the condenser, and thus reduce the error of the coaxial setting of the output light of the laser ranging system and the optical axis of the condenser.

Description

Technical Field

[0001] The present invention relates to the technical field of laser ranging technology, and in particular to a method and device for adjusting a light output optical axis of a laser ranging system. Background Art

[0002] In laser ranging, the target is illuminated by laser. After the laser is diffusely reflected on the surface of the target, part of the backscattered light returns along the original path, reaches the condenser and converges to be received by the photoelectric sensor. The time difference between the time of the emitted light and the time of the received light is obtained, and the distance to the target can be calculated by multiplying it by the speed of light.

[0003] In order to achieve relatively high measurement accuracy, the laser distance measurement system can be set to an optical structure in which the outgoing light is coaxial with the optical axis of the condenser. However, in the current laser distance measurement system, the adjustment accuracy of the optical axis of the collimator is low, and the coaxial setting error between the outgoing light after collimation by the collimator and the optical axis of the condenser is large, resulting in a larger light spot after the condenser of the laser distance measurement system converges the return light, and the distance measurement accuracy is low. Summary of the invention

[0004] The object of the present invention is to provide a method and device for adjusting the optical axis of the output light of a laser ranging system, which can improve the adjustment accuracy of a collimator and reduce the angle between the output light of the laser ranging system and the optical axis of a condenser, thereby reducing the error of the coaxial setting of the output light of the laser ranging system and the optical axis of the condenser.

[0005] The embodiment of the present invention is achieved as follows:

[0006] In one aspect of an embodiment of the present invention, a method for adjusting the light output optical axis of a laser ranging system is provided, which is applied to a light output optical axis adjusting device of the laser ranging system. The laser ranging system includes a condenser having a central hole and a collimator disposed in the central hole. The light output optical axis adjusting device includes a visible light source, a reflector and a laser. The reflector is disposed at a plane end of the condenser and covers the central hole of the condenser. The method includes:

[0007] The visible light source emits a visible light beam to the reflector, so that the visible light beam is reflected by the reflector to the emission point of the visible light source, wherein the light spot of the visible light beam on the reflector coincides with the orthographic projection of the geometric center of the central hole on the reflector;

[0008] Uninstall the reflector and install the collimator into the center hole of the condenser;

[0009] The laser emits a light beam, which exits through the optical axis of the collimator;

[0010] The optical axis inclination angle of the collimator is adjusted so that the light spot of the light beam emitted by the laser is located within a preset range centered on the emission point of the visible light source.

[0011] Optionally, the light-emitting optical axis adjustment device further includes an adjustment platform, and the visible light source emits a visible light beam to the reflector, so that the visible light beam is reflected by the reflector to the emission point of the visible light source, including:

[0012] The visible light source emits a visible light beam toward the reflector;

[0013] The adjusting platform rotates and adjusts the condenser with the light spot of the visible light source on the reflecting mirror as the center, so that the light spot of the visible light beam reflected by the reflecting mirror on the visible light source coincides with the emission point of the visible light source.

[0014] Optionally, the light output optical axis adjustment device further includes a photoelectric sensor, a fixing device and a reflective plate, and after the optical axis inclination of the collimator is adjusted so that the light spot of the light beam emitted by the laser is located within a preset range centered on the exit point of the visible light source, the method further includes:

[0015] The reflector receives and reflects the laser beam emitted through the optical axis of the collimator.

[0016] The photoelectric sensor moves along a first direction so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser lens sweeps across the photoelectric sensor along a straight line in the first direction, and the photoelectric sensor receives the light spot converged by the condenser lens and converts it into an electrical signal, wherein the first direction is perpendicular to the optical axis of the collimator lens;

[0017] If the scanning length of the light spot converged by the condenser mirror across the photoelectric sensor is less than a preset value, the fixing device fixes the collimator mirror in the central hole of the condenser mirror.

[0018] Optionally, after the photoelectric sensor moves along the first direction so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser lens sweeps across the photoelectric sensor along a straight line in the first direction, the method further includes:

[0019] The photoelectric sensor moves along the second direction so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser mirror sweeps across the photoelectric sensor along the straight line of the second direction. The photoelectric sensor receives the light spot converged by the condenser mirror and converts it into an electrical signal, wherein the second direction is perpendicular to the first direction and the optical axis of the collimator mirror respectively.

[0020] Optionally, the light-emitting optical axis adjustment device of the laser ranging system further includes a signal receiver, which is connected to the photoelectric sensor signal; if the scanning length of the light spot after the condenser lens sweeps across the photoelectric sensor is less than a preset value, the collimator lens is fixed in the central hole of the condenser lens, including:

[0021] The signal receiver receives the electrical signal sent by the photoelectric sensor;

[0022] If the displacement of the photoelectric sensor within the start and end time periods of the electrical signal is less than a preset value, the fixing device fixes the collimating lens in the central hole of the condensing lens.

[0023] Optionally, the preset value is the sum of the maximum allowable diameter of the light spot after being focused by the condenser and the diameter of the sensing surface of the photoelectric sensor.

[0024] Another aspect of an embodiment of the present invention provides a light-emitting optical axis adjustment device for a laser ranging system, wherein the laser ranging system comprises a condenser having a central hole and a collimator disposed in the central hole, and the device comprises:

[0025] A reflector, arranged at the flat end of the condenser and covering the central hole of the condenser;

[0026] A visible light source is used to emit a visible light beam to a reflector, so that the visible light beam is reflected by the reflector to an emission point of the visible light source, wherein a light spot of the visible light beam on the reflector coincides with an orthographic projection of a geometric center of the central hole on the reflector;

[0027] A laser, for emitting a light beam, wherein the light beam is emitted through an optical axis of the collimator;

[0028] The collimator adjustment frame is used to adjust the optical axis inclination of the collimator so that the light spot of the light beam emitted by the laser is located within a preset range centered on the emission point of the visible light source.

[0029] Optionally, the device further comprises:

[0030] The adjustment platform is used to rotate and adjust the condenser with the light spot of the visible light source on the reflector as the center, so that the light spot of the visible light beam reflected by the reflector on the visible light source coincides with the emission point of the visible light source.

[0031] Optionally, the device further comprises:

[0032] A reflector plate, used for receiving and reflecting the light beam emitted by the laser and emitted through the optical axis of the collimator;

[0033] A photoelectric sensor is used to move along a first direction so that a light spot of the light beam reflected by the reflector plate after being converged by the condenser lens sweeps across the photoelectric sensor along a straight line where the first direction is located, and the photoelectric sensor receives the light spot converged by the condenser lens and converts it into an electrical signal, wherein the first direction is perpendicular to the optical axis of the collimator lens; or is used to move along a first direction and a second direction respectively so that a light spot of the light beam reflected by the reflector plate after being converged by the condenser lens sweeps across the photoelectric sensor along a straight line where the first direction is located and a straight line where the second direction is located, and the photoelectric sensor receives the light spot converged by the condenser lens and converts it into an electrical signal, wherein the second direction is perpendicular to the first direction and the optical axis of the collimator lens respectively;

[0034] The fixing device is used to fix the collimator in the center hole of the condenser if the scanning length of the light spot after being converged by the condenser sweeping across the photoelectric sensor is less than a preset value.

[0035] Optionally, the device further comprises a signal receiver, which is connected to the photoelectric sensor signal;

[0036] A signal receiver, used for receiving an electrical signal sent by a photoelectric sensor;

[0037] The fixing device is specifically used to fix the collimator in the central hole of the condenser if the displacement of the photoelectric sensor in the start and end time periods of the electrical signal is less than a preset value.

[0038] The beneficial effects of the embodiments of the present invention include:

[0039] A method for adjusting the light output optical axis of a laser ranging system provided by an embodiment of the present invention is applied to a light output optical axis adjusting device of the laser ranging system. The laser ranging system includes a condenser with a central hole and a collimator arranged in the central hole. The light output optical axis adjusting device includes a visible light source, a reflector and a laser. The reflector is arranged at the plane end of the condenser and covers the central hole of the condenser. First, a visible light beam can be emitted to the reflector by the visible light source so that the visible light beam is reflected by the reflector to the emission point of the visible light source. Among them, the light spot of the visible light beam on the reflector coincides with the positive projection of the geometric center of the central hole on the reflector. Since the visible light beam reflected by the reflector returns along the original path of the optical axis of the visible light source, the optical axis of the visible light source is perpendicular to the reflector at this time. Because the light spot of the visible light beam on the reflector coincides with the positive projection of the geometric center of the central hole on the reflector, and the reflector is arranged at the plane end of the condenser and parallel to it, it can be considered that the optical axis of the visible light source coincides with the optical axis of the condenser (and the visible light source is located on the optical axis of the condenser). Then, the reflector is uninstalled and the collimator is installed in the center hole of the condenser, and then the laser emits a light beam so that the light beam is emitted through the optical axis of the collimator. After that, by adjusting the inclination angle of the optical axis of the collimator, the spot of the light beam emitted by the laser is located within a preset range (preset range set according to the allowable error) centered on the exit point of the visible light source. At this time, it can be considered that the optical axis of the collimator coincides with the optical axis of the laser. Since the optical axis of the visible light source coincides with the optical axis of the condenser after the above steps, the optical axis of the collimator coincides with the optical axis of the condenser at this time. Through this method, the optical axis of the collimator can be adjusted relatively accurately to reduce the error of the coaxial setting of the optical axis of the collimator and the optical axis of the condenser, thereby reducing the error of the coaxial setting of the exit light of the laser ranging system and the optical axis of the condenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 One of the flow charts of the method for adjusting the light output optical axis of the laser ranging system provided in an embodiment of the present invention;

[0042] Figure 2 A second flow chart of a method for adjusting the light output optical axis of a laser ranging system provided in an embodiment of the present invention;

[0043] Figure 3 A third flow chart of a method for adjusting the light output optical axis of a laser ranging system provided in an embodiment of the present invention;

[0044] Figure 4 A fourth flow chart of a method for adjusting the light output optical axis of a laser ranging system provided in an embodiment of the present invention;

[0045] Figure 5 One of the structural schematic diagrams of the light output optical axis adjustment device of the laser ranging system provided in an embodiment of the present invention;

[0046] Figure 6 A second structural schematic diagram of a light-emitting optical axis adjustment device for a laser ranging system provided in an embodiment of the present invention;

[0047] Figure 7 The third structural schematic diagram of the light output optical axis adjustment device of the laser ranging system provided in an embodiment of the present invention.

[0048] Icon: 510- condenser; 520- collimator; 610- reflector; 620- visible light source; 630- laser; 640- collimator adjustment frame; 650- reflector; 660- photoelectric sensor. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0052] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0053] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0054] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] An embodiment of the present invention provides a method for adjusting the light output axis of a laser ranging system, which is applied to a light output axis adjusting device of the laser ranging system. The laser ranging system includes a condenser having a central hole and a collimator arranged in the central hole. The light output axis adjusting device includes a visible light source, a reflector and a laser. The reflector is arranged at a plane end of the condenser and covers the central hole of the condenser. Figure 1 As shown, the method includes:

[0056] S101: A visible light source emits a visible light beam to a reflector, so that the visible light beam is reflected by the reflector to an emission point of the visible light source, wherein a light spot of the visible light beam on the reflector coincides with an orthographic projection of a geometric center of the central hole on the reflector.

[0057] S102: Uninstall the reflector and install the collimator into the center hole of the condenser.

[0058] S103: The laser emits a light beam, and the light beam is emitted through the optical axis of the collimator.

[0059] S104: Adjust the optical axis inclination angle of the collimating mirror so that the light spot of the light beam emitted by the laser is located within a preset range centered on the emission point of the visible light source.

[0060] Among them, the visible light source emits a visible light beam to the reflector, so that the visible light beam is reflected by the reflector to the exit point of the visible light source. In the process, when the visible light beam reflected by the reflector does not return to the exit point of the visible light source, the angle of the overall structure of the condenser and the reflector or the angle of the visible light source incident on the reflector can be adjusted so that the emitting mirror can finally reflect the visible light beam to the exit point of the visible light source.

[0061] It should be noted that, in practical applications, the distance between the visible light source and the condenser can be 15 meters to 25 meters, for example, 15 meters, 17 meters, 20 meters, 22 meters, 25 meters, etc. Of course, in practical applications, the distance between the visible light source and the condenser can also be other values, which are not limited here.

[0062] In practical applications, the height of the visible light source may be set flush with the condenser. Of course, in the embodiment of the present invention, the height of the visible light source may also be set to other heights, which is not limited here.

[0063] In an embodiment of the present invention, the visible light source can also be set on an adjustment frame to adjust the position of the visible light source through the adjustment frame, so as to adjust the position of the light spot of the visible light beam on the reflector, so that the light spot of the visible light beam on the reflector coincides with the orthographic projection of the geometric center of the center hole on the reflector.

[0064] In practical applications, the optical axis inclination of the collimator can be adjusted by a collimator adjustment frame. Unloading the reflector and installing the collimator can be operated by a manipulator. Of course, the above is only an exemplary implementation of the embodiment of the present invention. In the embodiment of the present invention, the optical axis inclination of the collimator can be adjusted by other methods, and the unloading of the reflector and the installation of the collimator can also be operated by other methods, which are not specifically limited here, for example, by manually adjusting the collimator, and manually unloading the reflector and installing the collimator.

[0065] In this method, the laser can be directly connected to the collimator lens, or the laser can be connected to the collimator lens through an optical fiber, which is not limited here.

[0066] In practical applications, those skilled in the art can set the preset range in the above steps according to the error range of the actual coaxial setting of the collimator optical axis and the condenser optical axis. Of course, the preset range can also be set to coincide with the emission point of the visible light source to further improve the accuracy of adjusting the optical axis of the collimator.

[0067] The method for adjusting the light output optical axis of a laser ranging system provided in an embodiment of the present invention is applied to a light output optical axis adjusting device of the laser ranging system. The laser ranging system includes a condenser with a central hole and a collimator arranged in the central hole. The light output optical axis adjusting device includes a visible light source, a reflector and a laser. The reflector is arranged at the plane end of the condenser and covers the central hole of the condenser. First, a visible light beam can be emitted to the reflector by the visible light source so that the visible light beam is reflected by the reflector to the exit point of the visible light source. Among them, the light spot of the visible light beam on the reflector coincides with the positive projection of the geometric center of the central hole on the reflector. Since the visible light beam reflected by the reflector returns along the original path of the optical axis of the visible light source, the optical axis of the visible light source is perpendicular to the reflector at this time. Because the light spot of the visible light beam on the reflector coincides with the positive projection of the geometric center of the central hole on the reflector, and the reflector is arranged at the plane end of the condenser and parallel to it, it can be considered that the optical axis of the visible light source coincides with the optical axis of the condenser (and the visible light source is located on the optical axis of the condenser). Then, the reflector is uninstalled and the collimator is installed in the center hole of the condenser, and then the laser emits a light beam so that the light beam is emitted through the optical axis of the collimator. After that, by adjusting the inclination angle of the optical axis of the collimator, the spot of the light beam emitted by the laser is located within a preset range (preset range set according to the allowable error) centered on the exit point of the visible light source. At this time, it can be considered that the optical axis of the collimator coincides with the optical axis of the laser. Since the optical axis of the visible light source coincides with the optical axis of the condenser after the above steps, the optical axis of the collimator coincides with the optical axis of the condenser at this time. Through this method, the optical axis of the collimator can be adjusted relatively accurately to reduce the error of the coaxial setting of the optical axis of the collimator and the optical axis of the condenser, thereby reducing the error of the coaxial setting of the exit light of the laser ranging system and the optical axis of the condenser.

[0068] Optionally, the light-emitting optical axis adjustment device further includes an adjustment platform, and the visible light source emits a visible light beam to the reflector, so that the visible light beam is reflected by the reflector to the emission point of the visible light source, such as Figure 2 As shown, including:

[0069] S201: The visible light source emits a visible light beam toward the reflector.

[0070] S202: The adjusting platform rotates and adjusts the condenser around the light spot of the visible light source on the reflector, so that the light spot of the visible light beam reflected by the reflector on the visible light source coincides with the emission point of the visible light source.

[0071] When the light output optical axis adjustment device of the laser ranging system also includes an adjustment table, the overall structure of the condenser and the reflector is rotated and adjusted by the adjustment table with the light spot of the visible light source on the reflector as the center, so that the position of the light spot of the visible light source on the reflector remains unchanged, and at the same time, the optical path of the visible light beam reflected by the reflector from the visible light source can be changed, so that the light spot of the visible light beam reflected by the reflector on the visible light source coincides with the exit point of the visible light source.

[0072] The condenser is adjusted through the adjustment table so that the light spot of the visible light beam reflected by the reflector on the visible light source coincides with the emission point of the visible light source. The operation is simple and convenient for automatic control.

[0073] Optionally, the light output optical axis adjustment device further includes a photoelectric sensor, a fixing device and a reflective plate, and adjusts the optical axis inclination of the collimator to make the light spot of the light beam emitted by the laser be located within a preset range centered on the emission point of the visible light source, such as Figure 3 As shown, the method also includes:

[0074] S301: The reflector receives and reflects the laser beam emitted through the optical axis of the collimator.

[0075] S302: The photoelectric sensor moves along a first direction so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser lens sweeps across the photoelectric sensor along a straight line in the first direction. The photoelectric sensor receives the light spot converged by the condenser lens and converts it into an electrical signal, wherein the first direction is perpendicular to the optical axis of the collimator lens.

[0076] S303: If the scanning length of the light spot converged by the condenser mirror across the photoelectric sensor is less than a preset value, the fixing device fixes the collimator mirror in the central hole of the condenser mirror.

[0077] Usually, the photoelectric sensor is arranged at the focus of the condenser. The reflector can be arranged at the position of the visible light source or at other positions, which is not limited here.

[0078] The photoelectric sensor is moved so that the light spot after being converged by the condenser can be swept across the photoelectric sensor along the straight line of the first direction. Since the diameter of the sensing surface of the photoelectric sensor is a fixed value, the diameter of the light spot after being converged by the condenser can be characterized according to the scanning length of the light spot after being converged by the condenser sweeping across the photoelectric sensor. Therefore, when the scanning length of the light spot after being converged by the condenser sweeping across the photoelectric sensor is less than the preset value, it indicates that the light spot after being converged by the condenser meets the preset requirements, that is, the error of the coaxial setting of the optical axis of the collimator and the optical axis of the condenser meets the requirements.

[0079] The preset value can be set according to the maximum allowable diameter of the light spot after the condenser is focused. For example, the preset value is the sum of the maximum allowable diameter of the light spot after the condenser is focused and the diameter of the sensing surface of the photoelectric sensor. That is, when the light spot (with a diameter of the maximum allowable diameter) after the condenser is focused passes over the sensing surface of the photoelectric sensor, the moving distance of the photoelectric sensor (that is, the scanning length of the light spot after the condenser is focused when the diameter is the maximum allowable diameter) passes over the sensing surface of the photoelectric sensor. For example, if the maximum allowable diameter of the light spot after the condenser is focused is 0.04 mm, and the diameter of the sensing surface of the photoelectric sensor is 0.5 mm, then the preset value is 0.54 mm.

[0080] Optionally, after the photoelectric sensor moves along the first direction so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser lens sweeps across the photoelectric sensor along a straight line in the first direction, the method further includes:

[0081] The photoelectric sensor moves along the second direction so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser mirror sweeps across the photoelectric sensor along the straight line of the second direction. The photoelectric sensor receives the light spot converged by the condenser mirror and converts it into an electrical signal, wherein the second direction is perpendicular to the first direction and the optical axis of the collimator mirror respectively.

[0082] By moving the photoelectric sensor in the second direction again through the above steps, it is verified whether the error of the coaxial arrangement of the optical axis of the collimator and the optical axis of the condenser meets the requirement, and the adjustment effect of the optical axis of the collimator can be further verified.

[0083] It should be noted that in actual applications, if the scanning length of the light spot after the condenser lens converges and sweeps across the photoelectric sensor in the above embodiment is greater than the preset value, it is necessary to re-adjust the optical axis of the collimator lens using this method. If the scanning length is equal to the preset value, it can be determined whether the optical axis of the collimator lens needs to be re-adjusted according to the actual situation.

[0084] It should also be noted that, in the above-mentioned embodiment, the fixing device can use an ultraviolet curing device to fix the collimator. Accordingly, when the collimator is installed in the central hole of the condenser, ultraviolet glue can be applied to the periphery of the collimator so that the ultraviolet curing device can fix the collimator by curing the ultraviolet glue. Of course, the fixing device can also use other devices, which are not limited here, as long as they can fix the collimator in the central hole. For example, it can also be a thermal curing device.

[0085] Optionally, the light output axis adjustment device of the laser ranging system further comprises a signal receiver, which is connected to the photoelectric sensor signal; if the scanning length of the light spot after the condenser lens sweeps across the photoelectric sensor is less than a preset value, the collimator lens is fixed in the central hole of the condenser lens, such as Figure 4As shown, including:

[0086] S401: The signal receiver receives the electrical signal sent by the photoelectric sensor.

[0087] S402: If the displacement of the photoelectric sensor within the start and end time periods of the electrical signal is less than a preset value, the fixing device fixes the collimating lens in the central hole of the condensing lens.

[0088] By setting up a signal receiver, the electrical signal emitted by the photoelectric sensor can be detected, so as to determine the timing when the light spot converged by the condenser sweeps across the photoelectric sensor, thereby relatively accurately obtaining the displacement of the photoelectric sensor when the light spot sweeps across the photoelectric sensor. The displacement of the photoelectric sensor is the scanning length of the light spot sweeping across the photoelectric sensor.

[0089] The signal receiver may be a device such as an oscilloscope that can display the electrical signal output of the photoelectric sensor.

[0090] Another aspect of the embodiment of the present invention is as follows Figure 5 , Figure 6 As shown, a light output optical axis adjustment device of a laser ranging system is provided. The laser ranging system includes a condenser 510 with a central hole and a collimator 520 arranged in the central hole. The device includes:

[0091] A reflector 610, which is arranged at the flat end of the condenser and covers the central hole of the condenser;

[0092] A visible light source 620 is used to emit a visible light beam to a reflector, so that the visible light beam is reflected by the reflector to an emission point of the visible light source, wherein a light spot of the visible light beam on the reflector coincides with an orthographic projection of a geometric center of the central hole on the reflector;

[0093] A laser 630, for emitting a light beam, wherein the light beam is emitted through the optical axis of the collimator;

[0094] The collimator adjustment frame 640 is used to adjust the optical axis inclination of the collimator so that the light spot of the light beam emitted by the laser is located within a preset range centered on the emission point of the visible light source.

[0095] The laser ranging system provided by the embodiment of the present invention has a light-emitting optical axis adjustment device, wherein the laser ranging system to be adjusted includes a condenser with a central hole, and a collimator arranged in the central hole, and the light-emitting optical axis adjustment device includes a visible light source, a reflector, and a laser, wherein the reflector is arranged at the plane end of the condenser and covers the central hole of the condenser. First, a visible light beam can be emitted to the reflector by the visible light source, so that the visible light beam is reflected to the exit point of the visible light source by the reflector. Among them, the light spot of the visible light beam on the reflector coincides with the positive projection of the geometric center of the central hole on the reflector. Since the visible light beam reflected by the reflector returns along the original path of the optical axis of the visible light source, the optical axis of the visible light source is perpendicular to the reflector at this time. Moreover, because the light spot of the visible light beam on the reflector coincides with the positive projection of the geometric center of the central hole on the reflector, and the reflector is arranged at the plane end of the condenser and parallel to it, it can be considered that the optical axis of the visible light source coincides with the optical axis of the condenser at this time (and the visible light source is located on the optical axis of the condenser). Then, the reflector is uninstalled and the collimator is installed in the center hole of the condenser, and then the laser emits a light beam so that the light beam is emitted through the optical axis of the collimator. After that, by adjusting the inclination angle of the optical axis of the collimator, the spot of the light beam emitted by the laser is located within a preset range (preset range set according to the allowable error) centered on the exit point of the visible light source. At this time, it can be considered that the optical axis of the collimator coincides with the optical axis of the laser. Since the optical axis of the visible light source coincides with the optical axis of the condenser after the above steps, the optical axis of the collimator coincides with the optical axis of the condenser at this time. Through this method, the optical axis of the collimator can be adjusted relatively accurately to reduce the error of the coaxial setting of the optical axis of the collimator and the optical axis of the condenser, thereby reducing the error of the coaxial setting of the exit light of the laser ranging system and the optical axis of the condenser.

[0096] Optionally, the device also includes: an adjustment platform (not shown in the figure), which is used to rotate and adjust the focusing mirror with the light spot of the visible light source on the reflector as the center, so that the light spot of the visible light beam reflected by the reflector on the visible light source coincides with the exit point of the visible light source.

[0097] Alternatively, if Figure 7 As shown, the device also includes:

[0098] The reflector 650 is used to receive and reflect the light beam emitted by the laser that is emitted through the optical axis of the collimator;

[0099] The photoelectric sensor 660 is used to move along a first direction so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser mirror sweeps across the photoelectric sensor along a straight line where the first direction is located, and the photoelectric sensor receives the light spot converged by the condenser mirror and converts it into an electrical signal, wherein the first direction is perpendicular to the optical axis of the collimator mirror; or to move along a first direction and a second direction respectively so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser mirror sweeps across the photoelectric sensor along a straight line where the first direction is located and a straight line where the second direction is located, and the photoelectric sensor receives the light spot converged by the condenser mirror and converts it into an electrical signal, wherein the second direction is perpendicular to the first direction and the optical axis of the collimator mirror respectively;

[0100] The fixing device (not shown in the figure) is used to fix the collimator in the center hole of the condenser if the scanning length of the light spot after being focused by the condenser sweeping across the photoelectric sensor is less than a preset value.

[0101] Optionally, the device further comprises a signal receiver (not shown in the figure), the signal receiver being connected to the photoelectric sensor signal;

[0102] A signal receiver, used for receiving an electrical signal sent by a photoelectric sensor;

[0103] The fixing device is specifically used to fix the collimator in the central hole of the condenser if the displacement of the photoelectric sensor in the start and end time periods of the electrical signal is less than a preset value.

[0104] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process and settings of the above-described device can refer to the corresponding process and description of the method in the aforementioned method embodiment, and will not be repeated in the present invention.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for adjusting the light output axis of a laser ranging system, applied to a device for adjusting the light output axis of a laser ranging system, characterized in that: The laser distance measurement system comprises a condenser having a central hole and a collimator arranged in the central hole, the light output optical axis adjustment device comprises a visible light source, a reflector and a laser, the reflector is arranged at the plane end of the condenser and covers the central hole of the condenser; the method comprises: The visible light source emits a visible light beam to the reflector, so that the visible light beam is reflected by the reflector to the exit point of the visible light source, wherein the light spot of the visible light beam on the reflector coincides with the orthographic projection of the geometric center of the central hole on the reflector; Uninstall the reflecting mirror and install the collimating mirror in the central hole of the condensing mirror; The laser emits a light beam, and the light beam is emitted through the optical axis of the collimator; Adjusting the optical axis inclination angle of the collimator lens so that the spot of the light beam emitted by the laser is located within a preset range centered on the emission point of the visible light source; The light-emitting optical axis adjustment device further comprises a photoelectric sensor, a fixing device and a reflective plate. After the optical axis inclination of the collimator is adjusted so that the light spot of the light beam emitted by the laser is located within a preset range centered on the emission point of the visible light source, the method further comprises: The reflector receives and reflects the light beam of the laser emitted through the optical axis of the collimator; The photoelectric sensor moves along a first direction, so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser lens sweeps across the photoelectric sensor along a straight line where the first direction is located, and the photoelectric sensor receives the light spot converged by the condenser lens and converts it into an electrical signal, wherein the first direction is perpendicular to the optical axis of the collimator lens; If the scanning length of the light spot converged by the condenser mirror sweeping across the photoelectric sensor is less than a preset value, the fixing device fixes the collimator mirror in the central hole of the condenser mirror.

2. The method according to claim 1, characterized in that The light-emitting optical axis adjustment device further includes an adjustment platform, and the visible light source emits a visible light beam to the reflector, so that the visible light beam is reflected by the reflector to the emission point of the visible light source, including: The visible light source emits a visible light beam toward the reflector; The adjusting platform rotates and adjusts the condenser around the light spot of the visible light source on the reflector, so that the light spot of the visible light beam reflected by the reflector on the visible light source coincides with the emission point of the visible light source.

3. The method according to claim 1 or 2, characterized in that After the photoelectric sensor moves along the first direction so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser lens passes through the photoelectric sensor along a straight line in the first direction, the method further includes: The photoelectric sensor moves along the second direction so that the light spot of the light beam reflected by the reflector plate after being converged by the condenser mirror sweeps across the photoelectric sensor along the straight line where the second direction is located, and the photoelectric sensor receives the light spot converged by the condenser mirror and converts it into an electrical signal, wherein the second direction is respectively perpendicular to the first direction and the optical axis of the collimator mirror.

4. The method according to claim 1, characterized in that The light-emitting optical axis adjustment device of the laser ranging system further comprises a signal receiver, and the signal receiver is connected to the photoelectric sensor signal; if the scanning length of the light spot after the condenser lens sweeps across the photoelectric sensor is less than a preset value, the collimator lens is fixed in the central hole of the condenser lens, comprising: The signal receiver receives the electrical signal sent by the photoelectric sensor; If the displacement of the photoelectric sensor within the start and end time period of the electrical signal is less than a preset value, the fixing device fixes the collimating lens in the central hole of the condensing lens.

5. The method according to claim 1, characterized in that The preset value is the sum of the maximum allowable diameter of the light spot after being focused by the condenser and the diameter of the sensing surface of the photoelectric sensor.

6. A light output axis adjustment device for a laser ranging system, characterized in that: The laser distance measurement system comprises a condenser having a central hole and a collimator arranged in the central hole, and the device comprises: A reflector, used to be disposed at the plane end of the condenser and cover the central hole of the condenser; a visible light source, used for emitting a visible light beam to the reflector, wherein the optical axis of the visible light source is perpendicular to the reflector, so that the visible light beam is reflected by the reflector to the emission point of the visible light source, wherein the light spot of the visible light beam on the reflector coincides with the orthographic projection of the geometric center of the central hole on the reflector; A laser, for emitting a light beam, wherein the light beam is emitted through the optical axis of the collimator; A collimator adjustment frame, used for adjusting the optical axis inclination angle of the collimator so that the light spot of the light beam emitted by the laser is located within a preset range centered on the emission point of the visible light source; A reflector plate, used for receiving and reflecting the light beam emitted by the laser and emitted through the optical axis of the collimator; A photoelectric sensor, used to move along a first direction so that the light spot of the light beam reflected by the reflector after being converged by the condenser passes through the photoelectric sensor along a straight line where the first direction is located, and the photoelectric sensor receives the light spot converged by the condenser and converts it into an electrical signal, wherein the first direction is perpendicular to the optical axis of the collimator; or used to move along a first direction and a second direction respectively so that the light spot of the light beam reflected by the reflector after being converged by the condenser passes through the photoelectric sensor along a straight line where the first direction is located and a straight line where the second direction is located, respectively, and the photoelectric sensor receives the light spot converged by the condenser and converts it into an electrical signal, wherein the second direction is perpendicular to the first direction and the optical axis of the collimator respectively; The fixing device is used to fix the collimator in the center hole of the condenser if the scanning length of the light spot after being converged by the condenser sweeping across the photoelectric sensor is less than a preset value.

7. The device according to claim 6, characterized in that The device also includes: The adjustment platform is used to rotate and adjust the condenser around the light spot of the visible light source on the reflector, so that the light spot of the visible light beam reflected by the reflector on the visible light source coincides with the emission point of the visible light source.

8. The device according to claim 6 or 7, characterized in that The device also includes a signal receiver, which is connected to the photoelectric sensor signal; The signal receiver is used to receive the electrical signal sent by the photoelectric sensor; The fixing device is specifically used to fix the collimating lens in the central hole of the condensing lens if the displacement of the photoelectric sensor in the start and end time periods of the electrical signal is less than a preset value.

Images