Optical installation structure and laser measuring instrument
By setting up a scattering device in the laser measuring instrument and adjusting its position, the energy of the reference beam is adjusted, thus solving the problem of measurement inaccuracy caused by the instability of the reference beam energy and ensuring the accuracy and stability of the measurement results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-03-17
AI Technical Summary
In existing laser measuring instruments, the energy of the reference beam is affected by a variety of factors, resulting in insufficient accuracy and stability of the measurement results.
A light-scattering device is set in the laser measuring instrument. By adjusting its position in the third light guide channel, the energy of the reference beam incident on the light receiver is adjusted to ensure that the energy of the reference beam received by the light receiver is appropriate.
This achieves accuracy and stability in the measurement results of the laser measuring instrument, avoiding measurement inaccuracies caused by excessive or insufficient energy of the reference beam.
Smart Images
Figure CN224005252U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of measurement technology, and in particular to an optical mounting structure and a laser measuring instrument. Background Technology
[0002] Currently, when measuring the distance to an object, a laser measuring instrument emits a modulated laser beam from a laser emitting component. After being collimated by a collimating lens component, the beam is split into two laser beams by a beam splitter. One beam continues to travel along the laser emission axis to the surface of the object being measured. The laser beam reflected or diffusely reflected back by the object is received by the lens component and focused onto a light receiver. This laser beam can be called the measurement beam. The other laser beam continues to travel towards the light receiver and is called the reference beam. By performing techniques such as frequency mixing on the measurement beam and the reference beam, the distance information between the object being measured and the measuring instrument can be obtained.
[0003] As is well known, the energy of the reference beam has a certain impact on the accuracy and stability of the final measurement results. The energy of the reference beam is influenced by various factors, such as the surface reflectivity error of the beam splitter and the installation angle error of the beam splitter. Therefore, how to adjust the energy of the reference beam to ensure that the measurement results of the laser measuring instrument have good accuracy and stability has become an urgent technical problem to be solved. Utility Model Content
[0004] The main objective of this application is to provide an optical mounting structure and a laser measuring instrument that can adjust the energy of a reference beam to ensure the stability and accuracy of the measurement results.
[0005] This application provides an optical mounting structure for mounting optical components of a laser measuring instrument, comprising: a mounting base having a first light guide channel, a second light guide channel, and a third light guide channel;
[0006] The laser measuring instrument comprises a laser emitting component mounted on the fixed base for emitting laser light, which is directed toward the object under test through the first light guide channel; a laser receiving component mounted on the fixed base for receiving laser light returning from the object under test through the second light guide channel; a beam splitter disposed within the first light guide channel for splitting the laser light into a measurement beam and a reference beam, the measurement beam passing through the first light guide channel toward the object under test, and the reference beam propagating through the third light guide channel to the photodetector of the laser receiving component; and a beam astigmatism device disposed within the third light guide channel, the position of which is adjustable, and the energy of the reference beam incident on the photodetector is adjusted by changing its position within the third light guide channel.
[0007] In one embodiment, the third light guide channel is provided with multiple slots, and the multiple slots are at different distances from the light receiver, and the light-scattering device is disposed in the slots.
[0008] In one embodiment, a sliding component is provided in the third light guide channel, and the light-scattering device is disposed on the sliding component. The position of the light-scattering device in the third light guide channel is adjustable through the sliding component.
[0009] In one embodiment, the sliding assembly includes a slide rail and a locking member. The slide rail is fixedly disposed within the third light guide channel, the locking member is slidable on the slide rail, and the light-scattering device is mounted on the locking member.
[0010] In one embodiment, the length of the third light guide channel is less than or equal to 35 mm.
[0011] In one embodiment, the mounting base includes a first mounting slot, which communicates with the first light guide channel; the laser emitting assembly is mounted in the first mounting slot.
[0012] In one embodiment, the mounting base includes a second mounting slot disposed within the second light guide channel, and the lens assembly in the laser receiving assembly is mounted within the second mounting slot.
[0013] In one embodiment, the mounting base includes a third mounting slot, which is disposed at a preset position in the second light guide channel. When the filter device in the laser receiving assembly is installed in the third mounting slot, the filter device does not block the reference beam.
[0014] In one embodiment, the mounting base includes a fourth mounting groove disposed within the first light guide channel, and the angle between the fourth mounting groove and the perpendicular line to the laser emission axis is θ; the angle between the axis of the third light guide channel and the laser emission axis is 2θ, wherein θ ≤ 40°.
[0015] This application also provides a laser measuring instrument, which includes:
[0016] An optical mounting structure, the optical mounting structure including a mounting base, the mounting base having a first light guiding channel, a second light guiding channel and a third light guiding channel;
[0017] A laser emitting assembly is mounted on the fixed base and is used to emit laser light, which is directed toward the object to be measured through the first light guide channel;
[0018] A laser receiving component is mounted on the fixed base and receives laser light reflected from the object under test through the second light guide channel;
[0019] A beam splitter, disposed within the first light guide channel, is used to split the laser into a measurement beam and a reference beam. The measurement beam passes through the first light guide channel and is directed toward the object under test. The reference beam propagates through the third light guide channel to the photoreceiver of the laser receiving component.
[0020] A light-diffusing device is disposed within the third light-guiding channel. The position of the light-diffusing device within the third light-guiding channel is adjustable, and the energy of the reference beam incident on the light receiver is adjusted by changing the position of the light-diffusing device within the third light-guiding channel.
[0021] The optical mounting structure can be any one of the optical mounting structures provided in this application.
[0022] In one embodiment, the astigmatism device is an attenuator, and the attenuator is a diffuse transmission neutral density filter.
[0023] In one embodiment, the beam splitter transmits more than 80% of the total laser energy to form the measurement beam and reflects less than 20% of the total laser energy to form the reference beam.
[0024] This application provides an optical mounting structure for mounting various optical components of a laser measuring instrument and combining them to form the laser measuring instrument. The laser measuring instrument has a diffusing device disposed in a third light guide channel. By adjusting the position of the diffusing device in the third light guide channel, that is, adjusting the distance between the diffusing device and the photoreceiver in the laser receiving assembly, the energy of the reference beam incident on the photoreceiver can be adjusted, so that the energy of the reference beam received by the photoreceiver is more suitable, thus ensuring the accuracy and stability of the measurement results of the laser measuring instrument. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 A schematic diagram of the cross-sectional structure of a laser measuring instrument provided in an embodiment of this application;
[0027] Figure 2 This application provides a schematic diagram of the optical path of a laser measuring instrument.
[0028] Figure 3 This is a schematic diagram of another cross-sectional structure of a laser measuring instrument provided in an embodiment of this application;
[0029] Figure 4 This is a cross-sectional schematic diagram of an optical mounting structure provided in an embodiment of this application.
[0030] Explanation of reference numerals in the attached figures:
[0031] 1000, Laser measuring instrument; 200, Object to be measured; 100, Optical mounting structure; 10, Fixing base; 11, First light guide channel; 110, Laser emission axis; 12, Second light guide channel; 120, Axis of the second light guide channel; 13, Third light guide channel; 130, Axis of the third light guide channel; 131, Slot; 132, Sliding assembly; 1321, Slide rail; 1322, Engaging component; 14, First mounting slot; 15, Second mounting slot; 16, Third mounting slot; 17, Fourth mounting slot; 20, Laser emission assembly; 21, Laser emitter; 22, Collimating lens assembly; 30, Laser receiving assembly; 31, Optical receiver; 32, Lens assembly; 33, Filter device; 40, Beam splitter; 50, Astigmatism device.
[0032] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0035] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0036] Please refer to Figure 1 , Figure 2 and Figure 4 , Figure 1 This is a schematic diagram of the cross-sectional structure of a laser measuring instrument provided in an embodiment of this application. Figure 2 This is a schematic diagram of the optical path of a laser measuring instrument provided in an embodiment of this application. Figure 4 This is a cross-sectional schematic diagram of an optical mounting structure provided in an embodiment of this application. The laser measuring instrument 1000 includes an optical mounting structure 100, a laser emitting component 20, a laser receiving component 30, a beam splitter 40, and a beam deflector 50.
[0037] The optical mounting structure 100 includes a mounting base 10. The mounting base 10 has a first light guide channel 11, a second light guide channel 12, and a third light guide channel 13.
[0038] The laser emitting assembly 20 is mounted on the mounting base 10. Specifically, in one embodiment, the mounting base 10 includes a first mounting groove 14, which communicates with the first light guiding channel 11. The laser emitting assembly 20 is mounted within the first mounting groove 14.
[0039] The laser emitting assembly 20 includes a laser emitter 21 and a collimating lens assembly 22, which are installed in the first mounting slot 14. The laser emitter 21 emits a laser beam, which, after being collimated by the collimating lens assembly 22, is directed towards the object 200 to be measured through the first light guide channel 11.
[0040] The laser receiving assembly 30 is mounted on the mounting base 10 and receives the laser light returned from the object under test 200 through the second light guide channel 12. Specifically, in one embodiment, the mounting base 10 includes a second mounting groove 15 disposed within the second light guide channel 12. The laser receiving assembly 30 includes a light receiver 31 and a lens assembly 32, wherein the lens assembly 32 is mounted within the second mounting groove 15 and is used to focus the laser light returned from the object under test 200 onto the light receiver 31.
[0041] In one embodiment, the light receiver 31 can be an avalanche photodiode (APD).
[0042] In one embodiment, such as Figure 1 and Figure 2 As shown, the laser receiving assembly 30 also includes a filter device 33. The mounting base 10 includes a third mounting groove 16, which is located at a preset position in the second light guide channel 12. The filter device 33 is installed in the third mounting groove 16 so that the filter device 33 does not block the reference beam in the third light guide channel 13.
[0043] It should be noted that, Figure 2 The cross-sectional structural diagram shown omits the filter device 33 to clearly illustrate the third mounting slot 16. Furthermore, this preset position is not limited to the position shown in the diagram; any position is acceptable as long as the filter device 33 does not block the third light guide channel 13 and thus obstruct the reference beam. No specific restrictions are imposed here.
[0044] The beam splitter 40 is disposed within the first light guide channel 11. Specifically, as shown... Figure 2 and Figure 4 As shown, the mounting base 10 includes a fourth mounting groove 17, which is disposed within the first light guide channel 11. The angle between the fourth mounting groove 17 and the perpendicular line to the laser emission axis is θ, where θ ≤ 40°. The beam splitter 40 is mounted within the fourth mounting groove 17. Thus, the beam splitter 40 forms an angle θ with the perpendicular line to the laser emission axis 110. Furthermore, it is easy to see from the figure that, in the direction of laser propagation, the beam splitter 40 is positioned behind the collimating lens assembly 22, meaning that the laser beam collimated by the collimating lens assembly 22 is directed towards the beam splitter 40.
[0045] The beam splitter 40 is used to split the collimated laser into two laser beams, namely a measurement beam and a reference beam. The measurement beam passes through the first light guide channel 11 and is directed toward the object under test 200; the reference beam is propagated through the third light guide channel 13 to the photodetector 31 of the laser receiving assembly 30.
[0046] In one embodiment, the beam splitter 40 allows more than 80% of the total laser energy to be transmitted to form a measurement beam, and allows less than 20% of the total laser energy to be reflected into the third light guide channel 13 to form a reference beam.
[0047] The light-scattering device 50 is disposed within the third light guide channel 13. The angle between the axis 130 of the third light guide channel and the laser emission axis 110 is 2θ. In this embodiment, the axis 130 of the third light guide channel is the line connecting the intersection of the laser emission axis 110 and the beam splitter 40 to the center of the photosensitive area of the light receiver 31; the length of the third light guide channel 13 is less than or equal to 35 mm.
[0048] The position of the scattering device 50 in the third light guide channel 13 is adjustable, and the energy of the reference beam incident on the light receiver 31 can be adjusted by changing the position of the scattering device 50 in the third light guide channel 13.
[0049] It is understandable that adjusting the position of the light-diffusing device 50 within the third light-guiding channel 13 is actually adjusting the distance x between the light-diffusing device 50 and the light receiver 31.
[0050] In one embodiment, the distance x is less than or equal to 35 mm. As the distance x between the astigmatism device 50 and the light receiver 31 increases, the energy of the reference beam reaching the light receiver 31 decreases rapidly, potentially to 10% of its original energy. -7 ~10 -4 The energy of the reference beam incident on the optical receiver 31 is increased by orders of magnitude, thus avoiding inaccurate measurement results due to excessively high energy of the reference beam. Alternatively, the energy of the reference beam incident on the optical receiver 31 can be increased by shortening the distance x between the astigmatism device 50 and the optical receiver 31, thereby avoiding inaccurate measurement results due to excessively low energy of the reference beam. Therefore, the laser measuring instrument 1000 provided in this application can effectively solve the problems of rough surface processing differences, as well as the problems of excessively high or low reference beam energy caused by surface reflectivity errors and installation angle errors of the beam splitter 40, ensuring the accuracy and stability of the final measurement results.
[0051] In one embodiment, such as Figure 1 and Figure 2As shown, the third light guide channel 13 is provided with multiple slots 131, each at a different distance from the light receiver 31. The light-diffusing device 50 is disposed within one of these slots 131. By placing the light-diffusing device 50 within different slots 131, the distance between the light-diffusing device 50 and the light receiver 31 can be adjusted. This adjustment method not only simplifies operation and saves time but also improves the design and manufacturing tolerance of the mounting base 10 of the laser measuring instrument 1000.
[0052] In another embodiment, such as Figure 3 As shown, Figure 3 This is another cross-sectional structural diagram of a laser measuring instrument provided in an embodiment of this application. A sliding component 132 is provided in the third light guide channel 13, and the light-scattering device 50 is disposed on the sliding component 132. The position of the light-scattering device 50 in the third light guide channel 13 is adjustable through the sliding component 132.
[0053] Specifically, the sliding assembly 132 includes a slide rail 1321 and a locking member 1322. The slide rail 1321 is fixedly disposed within the third light guide channel 13, and the locking member 1322 can slide on the slide rail 1321. The astigmatic device 50 is mounted on the locking member 1322. When the locking member 1322 slides on the slide rail 1321, the position of the astigmatic device 50 within the third light guide channel 13 changes, thereby adjusting the distance between the astigmatic device 50 and the light receiver 31. This sliding adjustment method is not only simple to operate but also saves operation time.
[0054] It is understood that the method for adjusting the position of the light-diffusing device 50 within the third light-guiding channel 13 is not limited to the two methods mentioned above, and may include other methods, as long as they enable the adjustment of the position of the light-diffusing device 50 within the third light-guiding channel 13. No specific limitations are imposed here. Furthermore, the Figures 1 to 3 The specific shapes of the card slot 131 and the sliding component 132 shown are just one of many shapes. The shapes of the card slot 131 and the sliding component 132 can also be other shapes, which are not specifically limited here.
[0055] In one embodiment, the light-diffusing device 50 can be an attenuator. The attenuator can be a diffuse transmission neutral density filter. Of course, the light-diffusing device 50 can also be other types of devices, as long as they can adjust light intensity, etc., and no specific limitations are imposed here.
[0056] The laser measuring instrument 1000 in this embodiment of the application has a scattering device 50 disposed in the third light guide channel 13. By adjusting the position of the scattering device 50 in the third light guide channel 13, that is, adjusting the distance between the scattering device 50 and the light receiver 31, the energy of the reference beam incident on the light receiver 31 can be adjusted, so that the energy of the reference beam received by the light receiver 31 is more suitable, thus ensuring the accuracy and stability of the measurement results of the laser measuring instrument.
[0057] This application also provides an optical mounting structure for mounting optical components of a laser measuring instrument, which is then combined with the various optical components to form the laser measuring instrument. For details regarding the specific structure of this optical mounting structure, please refer to the aforementioned embodiments and accompanying drawings of the laser measuring instrument; further details will not be repeated here.
[0058] The optical mounting structure of this application enables the assembled laser measuring instrument to adjust the energy of the reference beam, thereby ensuring the accuracy and stability of the measurement results of the laser measuring instrument.
[0059] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.
Claims
1. An optical mounting structure characterized by, An optical component for installing a laser measuring instrument, comprising: a fixed seat having a first light guide channel, a second light guide channel and a third light guide channel; wherein a laser emitting assembly of the laser measuring instrument is installed on the fixed seat for emitting laser, the laser is emitted to an object to be measured through the first light guide channel; a laser receiving assembly of the laser measuring instrument is installed on the fixed seat and receives laser returned from the object to be measured through the second light guide channel; a light splitting device of the laser measuring instrument is arranged in the first light guide channel, the light splitting device is used for splitting the laser into a measuring beam and a reference beam, the measuring beam is emitted to the object to be measured through the first light guide channel, and the reference beam is propagated to a light receiver of the laser receiving assembly through the third light guide channel; and a light dispersing device of the laser measuring instrument is arranged in the third light guide channel, the light dispersing device is adjustable in position in the third light guide channel, and the energy of the reference beam incident on the light receiver is adjusted by changing the position of the light dispersing device in the third light guide channel.
2. The optical mounting structure according to claim 1, wherein A plurality of clamping grooves are arranged in the third light guide channel, the plurality of clamping grooves are different in distance from the light receiver, and the light dispersing device is arranged in the clamping grooves.
3. The optical mounting structure according to claim 1, wherein A sliding assembly is arranged in the third light guide channel, the light dispersing device is arranged on the sliding assembly, and the light dispersing device is adjustable in position in the third light guide channel through the sliding assembly.
4. The optical mounting structure according to claim 3, wherein The sliding assembly comprises a sliding rail and a clamping piece, the sliding rail is fixedly arranged in the third light guide channel, the clamping piece is slidable on the sliding rail, and the light dispersing device is arranged on the clamping piece.
5. The optical mounting structure according to claim 1, wherein The length of the third light guide channel is less than or equal to 35 mm.
6. The optical mounting structure according to claim 1, wherein The fixed seat comprises a first mounting groove in communication with the first light guide channel, and the laser emitting assembly is arranged in the first mounting groove.
7. The optical mounting structure according to claim 1, wherein The fixed seat comprises a second mounting groove arranged in the second light guide channel, and a lens assembly in the laser receiving assembly is arranged in the second mounting groove.
8. The optical mounting structure according to claim 1, wherein The fixed seat comprises a third mounting groove arranged at a preset position of the second light guide channel, and when a light filtering device in the laser receiving assembly is arranged in the third mounting groove, the light filtering device does not block the reference beam.
9. The optical mounting structure according to claim 1, wherein The fixed seat comprises a fourth mounting groove arranged in the first light guide channel, and the angle between the fourth mounting groove and the perpendicular line of the laser emitting axis is θ; the angle between the axis of the third light guide channel and the laser emitting axis is 2θ, wherein θ≤40°.
10. A laser measuring instrument, characterized by, comprising: an optical mounting structure comprising a fixed seat having a first light guide channel, a second light guide channel and a third light guide channel; a laser emitting assembly installed on the fixed seat for emitting laser, the laser being emitted to an object to be measured through the first light guide channel; a laser receiving assembly mounted on the fixed seat and receiving the laser returned from the object to be measured through the second light guide channel; a light splitting device arranged in the first light guide channel, the light splitting device being configured to split the laser into a measurement beam and a reference beam, the measurement beam being transmitted through the first light guide channel to the object to be measured, and the reference beam being transmitted through the third light guide channel to a light receiver of the laser receiving assembly; and a light dispersing device arranged in the third light guide channel, the light dispersing device being adjustable in position in the third light guide channel, and the energy of the reference beam incident on the light receiver being adjusted by changing the position of the light dispersing device in the third light guide channel. The optical mounting structure is any one of the optical mounting structures of claims 1 to 9. The light dispersing device is an attenuating sheet, and the attenuating sheet is a diffuse transmission attenuating sheet.
11. The laser measuring instrument of claim 10, wherein, The light splitting device transmits more than 80% of the total energy of the laser to form the measurement beam, and reflects less than 20% of the total energy of the laser to form the reference beam.
12. The laser measuring instrument of claim 10, wherein,