A laser distance measuring device

Abstract

The application provides a laser ranging device for solving the problem of measuring the absolute distance between two detection points. The laser ranging device comprises a light source, a beam splitting assembly, a detector and two reflectors. The light source is used for emitting a detection beam. The beam splitting assembly is used for splitting the detection beam into a measurement light and a reference light with different polarization directions. The detector is used for receiving the measurement light and the reference light emitted by the beam splitting assembly to detect the distance between the two detection points. The two reflectors have optical centers and are respectively arranged at the positions of the two detection points. The optical centers coincide with the detection points. The beam splitting assembly is configured to guide the measurement light to travel at least between the two reflectors, and the optical path of the measurement light that travels more than the reference light is equal to N times the distance between the two detection points, N >= 1. The application makes the optical path of the measurement light that travels more than the reference light equal to N times the distance between the two detection points, so that the distance between the two detection points can be accurately measured by the optical path difference.

Description

Technical Field

[0001] This application relates to the field of optical metrology technology, specifically to a laser ranging device. Background Technology

[0002] Laser interferometry utilizes the principle of laser coherence to accurately measure optical path difference by observing changes in interference fringes. Furthermore, due to its sub-nanometer resolution, laser interferometry enables non-contact, non-destructive, long-distance detection. Therefore, laser interferometry is widely used in modern ultra-precision manufacturing such as microelectronics, micromechanics, and micro-optics, as well as in high-tech fields like photolithography and aerospace, to improve the processing quality of high-tech products. In existing technologies, laser interferometers are typically used to measure the displacement of a single object, i.e., the change in position. However, when measuring the absolute distance (non-displacement) between two objects, other ranging devices or compensation of the laser interferometer are required, which is not only complex to operate but also results in inaccurate measurements. Utility Model Content

[0003] This application provides a laser ranging device, which aims to solve the technical problem of measuring the absolute distance between two detection points using a laser ranging device.

[0004] Some embodiments of this application provide a laser ranging device for detecting the distance between two detection points, the laser ranging device comprising:

[0005] A light source used to emit a detection beam;

[0006] A beam splitter is used to split the detection beam into a measurement beam and a reference beam with different polarization directions.

[0007] A detector for receiving the measurement light and the reference light emitted by the beam splitter assembly to detect the distance between two detection points; and,

[0008] Two reflectors, each having an optical center, are respectively positioned at two detection points, with the optical centers coinciding with the two detection points.

[0009] The beam splitter is configured to guide the measurement light to travel between at least two of the reflectors, and the measurement light travels an additional path than the reference light equal to N times the distance between the two detection points, where N ≥ 1.

[0010] In some embodiments, the beam-splitting assembly includes a beam splitter and a quarter-wave plate;

[0011] The beam splitter has a first and a second light-transmitting surface arranged opposite to each other, as well as a third and a fourth light-transmitting surface arranged opposite to each other. Two reflectors are configured to reflect light transmitted through the first and second light-transmitting surfaces. Two quarter-wave plates are respectively disposed in the optical path between the beam splitter and the two reflectors. The light source faces the third light-transmitting surface, the detector faces the fourth light-transmitting surface, and the measurement light is transmitted in a straight line between the two reflectors.

[0012] In some embodiments, the beam splitter, the two reflectors, and the two quarter-wave plates are located on the same straight line, and the optical path of the measurement light travels between the optical centers of the two reflectors.

[0013] In some embodiments, the beam splitter assembly further includes a polarizer;

[0014] The polarizer is positioned on the optical path between the beam splitter and the detector.

[0015] In some embodiments, the laser ranging device further includes a carrier;

[0016] Each of the reflectors is mounted on each of the carriers, and the two carriers are respectively placed at the two detection point positions to detect the distance between the two detection points.

[0017] In some embodiments, the carrier includes a measuring ball;

[0018] The measuring ball has an opening, the reflector is installed inside the opening, and the center of the measuring ball coincides with the optical center of the reflector.

[0019] In some embodiments, the laser ranging device further includes an encapsulation body;

[0020] The beam splitter is integrated within the package.

[0021] In some embodiments, one of the two carriers is fixed relative to the package so that the measuring light is incident on the reflector fixed relative to the package.

[0022] In some embodiments, the laser ranging device further includes a housing and two sets of optical fibers;

[0023] The light source and the detector are integrated within the housing. One set of optical fibers connects the light source and the beam splitter, while another set of optical fibers connects the beam splitter and the detector.

[0024] In some embodiments, the laser ranging device further includes two fiber collimators;

[0025] The two fiber collimators are respectively connected between the beam splitter and the two sets of optical fibers.

[0026] According to the laser ranging device in the above embodiments, this application uses a beam splitting component to divide the detection beam emitted by the light source into a measurement beam and a reference beam with different polarization directions. The reference beam travels along a designed optical path and is received by the detector, while the measurement beam is guided to travel between at least two reflectors and is received by the detector. Since the measurement beam travels a greater distance than the reference beam by N times the distance between the two detection points (N≥1), the distance between the two detection points can be accurately measured by the greater distance traveled by the measurement beam than the reference beam. This not only ensures the accuracy of the absolute distance detection result between the two detection points, but also allows the two reflectors to be placed at any measurement position, making the arrangement flexible and convenient. Furthermore, the laser ranging device provided by this application does not require any other ranging equipment or compensation during the measurement process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the optical path structure of a laser ranging device in one embodiment of this application;

[0028] Figure 2 for Figure 1 A schematic diagram of the beam splitter component in a laser ranging device;

[0029] Figure 3 This is a schematic diagram of the optical path structure of the laser ranging device in another embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the overall structure of the laser ranging device in one embodiment of this application.

[0031] in:

[0032] 1-Light source; 2-Beam splitter assembly; 21-Beam splitter; 211-First light-transmitting surface; 212-Second light-transmitting surface; 213-Third light-transmitting surface; 214-Fourth light-transmitting surface; 22-1 / 4 wave plate; 23-Polarizer; 3-Detector; 4-Reflector; 5-Optical center; 6-Carrier; 7-Measuring block; 8-Packaging body; 91-Housing; 92-Fiber optic cable; 93-Fiber optic collimator. Specific Implementation

[0033] The present application will be further described in detail below with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0034] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0035] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0036] In existing technologies, when using a laser interferometer to measure the displacement of an object, at least two measurements are required. The interference fringes obtained from the first measurement, with the object at its initial position, are used as the "zero point" for comparison. Then, the object is moved, and a second measurement is performed. During this second measurement, the optical path of the measuring light changes, causing the interference fringes to shift. The displacement of the object can be determined based on the changes in the two interference fringes. However, if it is necessary to measure the absolute distance (not displacement) between two objects, other ranging devices or compensation of the laser interferometer are required to achieve the distance measurement. This is not only complex to operate but also results in inaccurate measurement accuracy.

[0037] This application provides a laser ranging device for detecting the distance between two detection points, such as... Figures 1 to 3As shown, the laser ranging device may include a light source 1, a beam splitter 2, a detector 3, and two reflectors 4. The light source 1 is used to emit a detection beam; the beam splitter 2 is used to split the detection beam into a measurement beam and a reference beam with different polarization directions; the detector 3 is used to receive the measurement beam and the reference beam emitted by the beam splitter 2 to detect the distance between two detection points; the reflectors 4 have optical centers 5, and the two reflectors 4 are respectively set at the positions of the two detection points, and the two optical centers 5 coincide with the two detection points respectively; wherein, the beam splitter 2 is configured to guide the measurement beam to travel at least between the two reflectors 4, and the optical path traveled by the measurement beam is equal to N times the distance between the two detection points, where N≥1.

[0038] For example, two detection points can be located at a reference point and a measurement point, respectively. Two reflectors 4 can be installed at the reference point and the measurement point, respectively, with the optical centers 5 of the two reflectors 4 coinciding with the reference point and the measurement point, respectively. During measurement, after the light source 1 emits the detection beam, the beam splitting assembly 2 can split the detection beam into a measurement beam and a reference beam with different polarization directions. The reference beam travels along the designed optical path and is received by the detector 3, while the measurement beam is guided at least between the two reflectors 4 and is received by the detector 3. Finally, the detector 3 recombines the measurement beam and the reference beam to form interference fringes. By counting the movement of the interference fringes, the additional optical path traveled by the measurement beam compared to the reference beam can be measured. Since the additional optical path traveled by the measurement beam compared to the reference beam is equal to N times the distance between the two detection points (N≥1), meaning the additional optical path traveled by the measurement beam compared to the reference beam is proportional to the distance between the two detection points, the distance between the two detection points can be accurately measured by using the additional optical path traveled by the measurement beam compared to the reference beam, thus ensuring the accuracy of the absolute distance detection result between the two detection points.

[0039] This application, by measuring the optical path traveled more than the reference light, can not only accurately measure the absolute distance between two detection points, but also allows the two reflectors 4 to be placed at any measurement position, offering flexible and convenient arrangement. This enables the laser ranging device to measure the distance between two detection points at any location. Furthermore, the laser ranging device provided in this application requires no additional ranging equipment or compensation during the measurement process, making the measurement of the distance between two detection points simple and convenient to operate.

[0040] In some embodiments, such as Figure 1 and Figure 2As shown, the beam splitting assembly 2 may include a beam splitter 21 and a quarter-wave plate 22; the beam splitter 21 has a first light-transmitting surface 211 and a second light-transmitting surface 212 arranged opposite to each other, and a third light-transmitting surface 213 and a fourth light-transmitting surface 214 arranged opposite to each other; two reflectors 4 are configured to reflect light transmitted through the first light-transmitting surface 211 and the second light-transmitting surface 212; two quarter-wave plates 22 are respectively arranged in the optical path between the beam splitter 21 and the two reflectors 4; the light source 1 faces the third light-transmitting surface 213; the detector 3 faces the fourth light-transmitting surface 214; and the measurement light is transmitted in a straight line between the two reflectors 4.

[0041] Specifically, such as Figure 1 and Figure 2 As shown, the four light-transmitting surfaces of the beam splitter 21 can be located in the four directions: up, down, left, and right. The left reflector 4 is configured to reflect light transmitted through the first light-transmitting surface 211, and the right reflector 4 is configured to reflect light transmitted through the second light-transmitting surface 212. The left quarter-wave plate 22 is disposed in the optical path between the left reflector 4 and the beam splitter 21, and the right quarter-wave plate 22 is disposed in the optical path between the right reflector 4 and the beam splitter 21. The third light-transmitting surface 213 is disposed in the optical path of the detection beam emitted by the light source 1, and the detector 3 is disposed in the optical path of the light transmitted from the fourth light-transmitting surface 214.

[0042] The detection beam emitted by light source 1 enters beam splitter 21 and is split into reference light and measurement light with different polarization directions by the beam splitter surface of beam splitter 21. The plane containing the incident and reflected light is defined as the incident plane. P-beam (Parallel) is linearly polarized light with its polarization direction parallel to the incident plane, and S-beam (Senkrecht) is linearly polarized light with its polarization direction perpendicular to the incident plane. P-beams pass through the beam splitter surface of beam splitter 21, while S-beams are reflected by the beam splitter surface of beam splitter 21. Figure 1 As shown, solid arrows represent P-beams, and hollow arrows represent S-beams. The P-beam is used as the reference beam, and the S-beam as the measurement beam. When the detection beam emitted by the light source 1 enters the beam splitter 21, the reference beam (P-beam) passes through the beam splitter and directly enters the detector 3 above. The measurement beam (S-beam) is reflected by the beam splitter of the beam splitter 21 to the left quarter-wave plate 22. After passing through the left quarter-wave plate 22, the measurement beam (S-beam) is reflected back to the left quarter-wave plate 22 by the left reflector 4. At this point, the polarization state of the measurement beam (S-beam) is adjusted to that of the measurement beam (P-beam). The measurement beam (P-beam) passes through the beam splitter of the beam splitter 21 and the right quarter-wave plate 22, and is reflected back to the right quarter-wave plate 22 by the right reflector 4. At this point, the polarization state of the measurement beam (P-beam) is adjusted to that of the measurement beam (S-beam). The measurement beam (S-beam) is reflected by the beam splitter of the beam splitter 21 to the detector 3.

[0043] In this way, the measuring light and the reference light coincide on the straight optical path from the light source 1 to the detector 3. The additional optical path traveled by the measuring light compared to the reference light is exactly twice the distance between the optical centers 5 of the two reflectors 4. That is, the optical path difference between the measuring light and the reference light is ΔL = 2S, where S is the distance between the optical centers 5 of the two reflectors 4. Based on the optical path difference ΔL, the distance between the optical centers 5 of the two reflectors 4 can be obtained as S = 1 / 2ΔL. Therefore, before measurement, it is only necessary to set the two reflectors 4 at the two detection points respectively, and make the optical centers 5 of the reflectors 4 coincide with the detection points. The laser ranging device of this application can then accurately measure the absolute distance between the two detection points. The beam splitter 21 can also be configured to be aligned with... Figure 1 The beam splitter 21 has its beam-splitting surfaces arranged in opposite directions, so that when measuring the distance between the two reflectors 4, the measuring light first passes through the right quarter-wave plate 22 and the right reflector 22, and then through the left quarter-wave plate 22 and the left reflector 22. This application does not impose any special restrictions on the arrangement of the beam-splitting surfaces in the beam splitter 21.

[0044] Furthermore, this embodiment requires only one beam splitter 21, two quarter-wave plates 22, and two reflectors 4 to accurately measure the absolute distance between two detection points. This eliminates the need for multiple measurements and other ranging equipment, and also eliminates the need for optical path compensation during the measurement process. This not only reduces the cost of the laser ranging device but also simplifies operation. The beam splitter 21 can be a polarizing beam splitter prism, a wire grid polarizer, or an electro-optic modulator, while the reflectors 4 can be a cornerstone prism, a microprism array, or a combination of plane mirrors. This application does not impose any special limitations on the specific components of the beam splitter 21 and the reflectors 4.

[0045] In some embodiments, such as Figure 1 As shown, the beam splitter 21, two reflectors 4, and two quarter-wave plates 22 are located on the same straight line, and the optical path of the measuring light is contained between the optical centers 5 of the two reflectors.

[0046] Therefore, the two reflectors 4 and the two quarter-wave plates 22 can be symmetrically arranged on both sides of the beam splitter 21, allowing for better arrangement of the optical components of the laser rangefinder and reducing the manufacturing difficulty of the laser rangefinder. Simultaneously, the measuring light can travel between the optical centers 5 of the two reflectors 4, and both the measuring light and the reference light pass through the center of the beam splitter 21, ensuring that the optical path of the measuring light traveling between the two reflectors 4 is a straight line, thus guaranteeing the accuracy of the measurement results.

[0047] In addition, such as Figure 1 As shown, the beam splitter assembly 2 may also include a polarizer 23; the polarizer 23 is disposed in the optical path between the beam splitter 21 and the detector 3.

[0048] The polarizer 23 is used to adjust the polarization direction of the measurement light and the reference light, so that the measurement light and the reference light retain only the same polarization component, thereby improving the interference visibility and suppressing polarization-related noise. This allows the measurement light and the reference light to form interference fringes better within the detector 3, resulting in more accurate measurement information. The polarizer 23 can be an optical device such as a polarizer or a Nicol prism; this application does not impose any special restrictions on the specific structure of the polarizer 23.

[0049] To facilitate the installation of reflector 4, such as Figure 1 As shown, the laser ranging device may also include a carrier 6; each reflector 4 is mounted on each carrier 6, and the two carriers 6 are respectively placed at two detection point positions to detect the absolute distance between the two detection points.

[0050] The support member 6 not only provides space for the reflector 4 to be installed, but also effectively protects the reflector 4 from damage such as impacts that could affect the normal measurement of the laser rangefinder. Furthermore, the support member 6 can be configured with different matching shapes according to the shape of the detection point to be measured, thereby making the absolute distance between the two detection points more accurate.

[0051] In some embodiments, such as Figure 1 As shown, the carrier 6 may include a measuring ball; the measuring ball may have an opening, the reflector 4 may be installed in the opening, and the center of the measuring ball coincides with the optical center 5 of the reflector 4.

[0052] For example, when it is necessary to measure the distance between the inner walls of two oppositely positioned parts in a narrow space, by setting the support member 6 as a measuring ball structure, the two measuring balls can be placed on one side of the inner walls of the two parts respectively, and the measuring balls can be placed against the inner walls of the parts respectively. After the laser rangefinder completes the measurement, the distance between the inner walls of the two oppositely positioned parts can be obtained based on the measurement results and the radius of the measuring balls.

[0053] In this context, the optical center 5 of reflector 4 refers to the point where the incident light, after being reflected within reflector 4, forms a returning light that coincides with the incident light. This ensures that both the incident and returning light travel along the same straight line, guaranteeing that the measuring light returns along its original path without undergoing multiple reflections within reflector 4. This allows the laser ranging device to accurately measure the absolute distance between two detection points, ensuring the accuracy of the measurement structure.

[0054] In other embodiments, such as Figure 3As shown, the support member 6 can also be configured as a measuring block 7. For example, when it is necessary to measure the distance between the inner walls of two oppositely positioned parts in a narrow space, the measuring block 7 can also be configured as a rectangular block, allowing it to be placed against the inner wall of the part for measurement. Alternatively, when it is necessary to detect the center distance between two circular grooves, the measuring block 7 can also be configured as a disc, allowing it to be placed within the circular groove for measurement. This application does not impose any special limitations on the specific shape of the support member 6.

[0055] In addition, such as Figures 1 to 3 As shown, the laser ranging device may also include a package 8; the beam splitter 2 may be integrated into the package 8.

[0056] For example, the beam splitter 21, the quarter-wave plate 22, and the polarizer 23 can be integrated into the package 8. Alternatively, the beam splitter 21, the quarter-wave plate 22, and the reflector 5 can be integrated into the package 8. By integrating the beam splitter assembly 2 into the package 8, the laser rangefinder can be modularly designed, thereby reducing the size of the laser rangefinder and facilitating its portability and measurement.

[0057] Among them, such as Figure 1 and Figure 3 As shown, one of the two carriers 6 can be fixed relative to the package 8 so that the measuring light is incident on the reflector 4 which is fixed relative to the package 8.

[0058] During measurement, since one of the carriers 6 is fixed relative to the package 8, the optical path between the carrier 6 and the package 8 is also fixed. When it is necessary to detect the distance between one detection point and multiple other detection points, the carrier 6, which is fixed relative to the package 8, can always be placed at the same detection point position. During measurement, only the carrier 6, which is movable relative to the package 8, needs to be moved to complete the measurement of the distance between one detection point and multiple other detection points. For example, when the carrier 6 is a measuring ball, one measuring ball can be placed at one detection point position, and the other measuring ball only needs to be placed at different detection point positions for measurement. In other embodiments, both carriers 6 can also be movable relative to the package 8. This application does not impose any special restrictions on whether the carrier 6 is fixed relative to the package 8. The carrier 6 and the package 8 can be fixed relative to each other by means of bonding, fastening, or plugging. This application does not impose any special restrictions on the specific connection method between the carrier 6 and the package 8.

[0059] In addition, such as Figure 4As shown, the laser ranging device may also include a housing 91 and two sets of optical fibers 92; the light source 1 and the detector 3 may be integrated into the housing 91, one set of optical fibers 92 is connected between the light source 1 and the beam splitter 2, and the other set of optical fibers 92 is connected between the beam splitter 2 and the detector 3.

[0060] The light source 1 and detector 3 are integrated within the housing 91 to form a probe device. In this case, the detection beam emitted by the light source 1 can be transmitted to the beam splitter 2 via the optical fiber 92. The beam splitter 2 splits the detection beam into a measurement beam and a reference beam. The reference beam propagates along the optical path designed in the beam splitter 2 and is received by the detector 3. The measurement beam is guided between two reflectors 4 and is ultimately received by the detector 3. The detector 3 performs interferometry on the measurement beam and the reference beam to obtain measurement information. The light source 1 can be a side-emitting laser (EEL) or a vertical-cavity surface-emitting laser (VCSEL). This application does not impose any special restrictions on the specific structure of the light source 1. In other embodiments, the light source 1 and detector 3 can also be directly mounted on the package 8. This application does not impose any special restrictions on the specific locations of the light source 1 and detector 3.

[0061] In some embodiments, such as Figure 4 As shown, the laser ranging device may also include two fiber collimators 93; the two fiber collimators 93 are respectively connected between the beam splitting assembly 2 and the two sets of optical fibers 92.

[0062] The fiber optic collimator 93 can convert a beam with a large divergence angle into a beam with a small divergence angle, thereby coupling it into various optical devices with lower loss. For example, one fiber optic collimator 93 can convert the detection beam emitted by the light source 1 into a beam with a small divergence angle and then direct it into the beam splitter assembly 2. Another fiber optic collimator 93 can convert the detection beam emitted from the beam splitter assembly 2 into a beam with a small divergence angle and then return it to the detector 3 through the fiber optic cable 92 for detection.

[0063] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the ideas presented in the application.

Claims

1. A laser ranging device, characterized in that, The laser ranging device, used for measuring the distance between two detection points, includes: A light source used to emit a detection beam; A beam splitter is used to split the detection beam into a measurement beam and a reference beam with different polarization directions. A detector for receiving the measurement light and the reference light emitted by the beam splitter assembly to detect the distance between two detection points; and, Two reflectors, each having an optical center, are respectively positioned at two detection points, with the optical centers coinciding with the two detection points. The beam splitter is configured to guide the measurement light to travel between at least two of the reflectors, and the measurement light travels an additional path than the reference light equal to N times the distance between the two detection points, where N ≥ 1.

2. The laser ranging device as described in claim 1, characterized in that, The beam splitting assembly includes a beam splitter and a quarter-wave plate; The beam splitter has a first and a second light-transmitting surface arranged opposite to each other, as well as a third and a fourth light-transmitting surface arranged opposite to each other. Two reflectors are configured to reflect light transmitted through the first and second light-transmitting surfaces. Two quarter-wave plates are respectively disposed in the optical path between the beam splitter and the two reflectors. The light source faces the third light-transmitting surface, the detector faces the fourth light-transmitting surface, and the measurement light is transmitted in a straight line between the two reflectors.

3. The laser ranging device as described in claim 2, characterized in that, The beam splitter, the two reflectors, and the two quarter-wave plates are located on the same straight line, and the optical path of the measuring light is contained between the optical centers of the two reflectors.

4. The laser ranging device as described in claim 2, characterized in that, The beam splitter assembly also includes a polarizer; The polarizer is positioned on the optical path between the beam splitter and the detector.

5. The laser ranging device as described in claim 1, characterized in that, The laser ranging device also includes a carrier component; Each of the reflectors is mounted on each of the carriers, and the two carriers are respectively placed at the two detection point positions to detect the distance between the two detection points.

6. The laser ranging device as described in claim 5, characterized in that, The carrier includes a measuring ball; The measuring ball has an opening, the reflector is installed inside the opening, and the center of the measuring ball coincides with the optical center of the reflector.

7. The laser ranging device as described in claim 5, characterized in that, The laser ranging device also includes an encapsulation body; The beam splitter is integrated within the package.

8. The laser ranging device as described in claim 7, characterized in that, One of the two carriers is fixed relative to the package body so that the measuring light is incident on the reflector fixed relative to the package body.

9. The laser ranging device as described in any one of claims 1 to 8, characterized in that, The laser ranging device also includes a housing and two sets of optical fibers; The light source and the detector are integrated within the housing. One set of optical fibers connects the light source and the beam splitter, while another set of optical fibers connects the beam splitter and the detector.

10. The laser ranging device as described in claim 9, characterized in that, The laser ranging device also includes two fiber optic collimators; The two fiber collimators are respectively connected between the beam splitter and the two sets of optical fibers.

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