Laser range finder ranging performance evaluation test equipment

Abstract

The utility model discloses a laser range finder ranging performance evaluation test equipment, including fixed jig, and the outside contour shape of fixed jig and the laser range finder of measuring is in accord with, and is equipped with respectively in fixed jig simulation receiving installation site and simulation emission receiving site, relative simulation receiving installation site and simulation emission installation site, are equipped with respectively receiving lens module and emission lens module, wherein: receiving lens module includes the receiving lens group, first crosshair scale plate, light attenuator and detector who set up in order along the light path emission direction of measuring laser range finder, emission lens module includes the light source, second crosshair scale plate, focal length adjusting objective and emission lens group who arrange in order according to simulation light path emission direction. The utility model discloses from focusing control, detector protection, beam control to observation reference illumination, each aspect has carried out optimization and improvement, and the performance simulation test of laser range finder has provided more accurate, efficient, stable solution.

Description

Technical Field

[0001] This utility model relates to the field of laser rangefinder testing technology, and in particular to a laser rangefinder ranging performance evaluation and testing device. Background Technology

[0002] Simulation testing of laser rangefinders is a crucial testing method that allows for the evaluation and verification of various performance indicators of laser rangefinders without the need for actual and complex outdoor measurements.

[0003] Traditional laser rangefinder testing typically relies on real-world environmental testing. However, real-world environments contain many uncontrollable factors, such as weather, terrain, and target characteristics, which can interfere with the test results, making it difficult to accurately assess the true performance of the laser rangefinder. Simulation testing, on the other hand, can accurately simulate various real-world measurement scenarios with different distances and reflectivities by constructing specific optical environments and target models.

[0004] In the simulation testing of laser rangefinders, the performance of the transmitting and receiving lens modules is a key factor determining the overall system testing accuracy. In-depth analysis reveals that existing technical solutions have significant limitations in several aspects:

[0005] For the transmitting lens module, on the one hand, in terms of beam control, the traditional transmitting lens system adopts a fixed magnification beam expander objective design. This rigid configuration cannot flexibly adjust the beam divergence angle parameters according to the actual needs of different ranging scenarios, resulting in poor system adaptability. On the other hand, in terms of observation reference, due to the lack of illumination on the reticle, the visual recognition of the crosshairs is significantly reduced in low light environments or complex lighting conditions, which directly affects the operator's alignment accuracy and work efficiency.

[0006] For the receiving lens module, firstly, in terms of focus control, the receiving lens group and the detector use a fixed distance, making it impossible to fine-tune the focal length as needed to achieve precise matching. This makes it difficult to achieve accurate focusing in simulated measurement scenarios, thus affecting the accuracy of test results. Secondly, in terms of detector hardware design, there is a significant risk of fragility. When a high-intensity beam of light is incident on the detector receiver, the detector is easily damaged due to the lack of attenuation mechanism, affecting the stability and reliability of the entire test system. Finally, in terms of observation benchmark, the receiving lens module also suffers from the drawback of insufficient illumination. Utility Model Content

[0007] The purpose of this invention is to propose a laser rangefinder performance evaluation and testing device. This device aims to solve many problems existing in the simulation testing of existing laser rangefinders, providing a more accurate, stable, and efficient solution for the performance evaluation of laser rangefinders. Through a series of unique designs and improvements, it overcomes the limitations of traditional equipment in areas such as focus control, detector protection, beam control, and observation benchmarks.

[0008] To achieve the above objectives, this utility model discloses a laser rangefinder performance evaluation and testing device, the key feature of which is: it includes a fixed fixture that conforms to the outer contour shape of the laser rangefinder under test, and within the fixed fixture, corresponding to the transmitting probe and receiving probe of the laser rangefinder under test, there are simulated receiving mounting positions and simulated transmitting and receiving positions, respectively; relative to the simulated receiving mounting positions and simulated transmitting mounting positions, there are respectively a receiving lens module and a transmitting lens module; wherein:

[0009] The receiving lens module includes a receiving lens group, a first crosshair reticle, an optical attenuator, and a detector arranged sequentially along the optical path emission direction of the laser rangefinder under test. The emitting end of the detector uses the crosshair reference line of the first crosshair reticle to complete the optical axis deviation angle calibration. Between the detector and the receiving lens group, the distance between them is adjusted by a focal length fine-tuning structure to fine-tune the focusing of the emitting end of the detector. A first illumination unit is also provided relative to the first crosshair reticle.

[0010] The transmitting lens module includes a light source, a second crosshair reticle, a focal length adjustment objective, and a transmitting lens group arranged sequentially according to the simulated optical path emission direction; the light source achieves fine adjustment of the optical axis deflection angle through a deflection fine adjustment mechanism to complete calibration under the indication of the second crosshair reticle; the distance between the focal length adjustment objective and the transmitting lens group is adjustable, thereby realizing the change of beam expansion magnification; a second illumination unit is also provided relative to the second crosshair reticle.

[0011] Furthermore, the objective lenses in the receiving lens assembly are respectively assembled in the first receiving lens barrel via the first pressure ring, and the first cross-shaped reticle is provided at the tail end of the first receiving lens barrel.

[0012] Furthermore, the focal length fine-tuning structure includes a second receiving lens tube that is threadedly connected to the first receiving lens tube, and the detector is mounted inside the second receiving lens tube by means of a mounting plate; by rotating the second receiving lens tube, the distance between the receiving lens group and the detector can be adjusted; a set screw for limiting the rotational position of the second receiving lens tube is also provided between the second receiving lens tube and the first lens tube.

[0013] Furthermore, a light attenuator is provided in the second receiving lens tube between the first crosshair reticle and the detector.

[0014] Furthermore, the first lighting unit includes a first LED light arranged laterally and a first power cable, and the first LED light is installed through a first lighting hole reserved on the wall of the second receiving lens barrel.

[0015] Furthermore, both the light source and the second cross-shaped engraving plate can be detachably mounted in the mounting holes of the mounting base, and the optical axis of the light source passes through the center of the cross reference line of the second cross-shaped engraving plate.

[0016] Furthermore, the focal length adjustment objective lens is installed in the internal threaded sleeve via an external threaded retainer, and its installation position can be controlled by rotating the external threaded retainer; the transmitting lens assembly is assembled and fixed by means of a second pressure ring.

[0017] Furthermore, the probe emitting lens module also includes a first emitting lens barrel and a second emitting lens barrel, which are coaxially and detachably connected by mounting screws to form a light guide channel; a mounting base is provided at the first end of the first emitting lens barrel, and a focal length adjustment objective lens and an emitting lens group are respectively provided at the first and last ends of the second emitting lens barrel.

[0018] Furthermore, the deflection fine-tuning mechanism includes at least four fine-tuning screws evenly distributed along the circumference of the first emitting lens barrel. The fine-tuning screws extend radially inward through threaded holes opened on the wall of the first emitting lens barrel, and their ends abut against the mounting base to achieve optical axis deflection compensation.

[0019] Furthermore, the receiving lens module is fixed to a sliding platform by means of a horizontal base plate. The sliding platform is slidably connected by a guide limiting structure, and the sliding position of the sliding platform is controlled by a push-pull handle to correct the relative relationship between the receiving lens module and the simulated receiving mounting position. The transmitting lens module is directly fixed to the simulated transmitting mounting position by means of a vertical base plate.

[0020] Compared with the prior art, the significant advantages of this utility model are:

[0021] (1) In terms of focus control, the focal length can be finely adjusted according to requirements using a focal length fine-tuning structure, thereby achieving precise matching of the focal lengths of the receiving lens group and the detector. In this way, accurate focusing can be achieved in simulated measurement scenarios, effectively improving the accuracy of test results. This improvement solves the problem of fixed distance between the receiving lens group and the detector and inability to fine-tune the focal length in the existing technology, making the testing process more flexible and accurate;

[0022] (2) Regarding detector protection, the optical attenuator effectively solves the problem of detector vulnerability. When a high-intensity beam is incident on the detector receiver, the optical attenuator can attenuate the beam, preventing the detector from being damaged by the high-intensity beam and improving the stability and reliability of the entire test system;

[0023] (3) In terms of beam control, the distance between the focal length adjustment objective of the transmitting lens module and the transmitting lens group is adjustable, which can realize the change of beam expansion ratio. This means that in different ranging scenarios, the beam divergence angle parameter can be precisely adjusted according to actual needs, which greatly improves the adaptability and testing accuracy of the system. For example, in the test scenario of simulating close-range, high-reflectivity targets, the beam expansion ratio can be reduced to make the beam more concentrated and obtain more accurate test data; while in the test scenario of simulating long-range, low-reflectivity targets, the beam expansion ratio can be increased to enable the beam to cover a wider range and ensure the comprehensiveness of the test.

[0024] (4) Regarding the observation reference, both the receiving lens module and the transmitting lens module are equipped with illumination units. These illumination units provide illumination support for the crosshair reticle, ensuring good visual recognition of the crosshairs even in low-light environments or under complex lighting conditions, thereby improving the operator's alignment accuracy and work efficiency;

[0025] (5) The fixed fixture design ensures that the laser rangefinder under test can be accurately installed in the equipment. The simulated receiving and transmitting mounting positions precisely correspond to the transmitting and receiving probes of the laser rangefinder under test, providing a stable and accurate foundation for the entire testing process. At the same time, the receiving lens module can be flexibly adjusted in position according to the actual situation through the sliding stage and guide limiting structure, and precisely matched with the simulated receiving mounting position; the transmitting lens module is firmly fixed on the simulated transmitting mounting position by the vertical base plate, ensuring the stability of the transmitting optical path;

[0026] (6) Each component adopts a detachable design. For example, the objective lens of the receiving lens group is assembled into the first receiving lens barrel via a first retaining ring, and the transmitting lens group is assembled and fixed with the second retaining ring. The first and second transmitting lens barrels are coaxially and detachably connected by mounting screws. This makes equipment maintenance and component replacement more convenient and efficient. In actual use, if a component malfunctions or needs performance upgrade, the operator can quickly disassemble and replace the corresponding component, reducing equipment downtime and improving equipment utilization efficiency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a front view of the laser rangefinder ranging performance evaluation test equipment in Example 1;

[0029] Figure 2 This is a top view of the laser rangefinder ranging performance evaluation test equipment in Example 1;

[0030] Figure 3 yes Figure 2 Sectional view along line AA;

[0031] Figure 4 This is a schematic diagram of the internal structure of the receiving lens module in Embodiment 1 (I);

[0032] Figure 5 This is a schematic diagram (II) of the internal structure of the receiving lens module in Embodiment 1;

[0033] Figure 6 This is a front view of the receiving lens module in Embodiment 1;

[0034] Figure 7 This is a top view of the receiving lens module in Embodiment 1;

[0035] Figure 8 This is a schematic diagram of the internal structure of the transmitting lens module in Embodiment 1 (I);

[0036] Figure 9 This is a schematic diagram (III) of the internal structure of the transmitting lens module in Embodiment 1;

[0037] Figure 10 This is a front view of the transmitting lens module in Embodiment 1;

[0038] The diagram is labeled: 1-fixed fixture, 101-simulated receiver mounting position, 102-simulated transmitter mounting position;

[0039] 2-Receiving lens module, 201-Receiving lens group, 202-First crosshair reticle, 203-Light attenuator, 204-Detector, 205-Focus fine-tuning structure, 206-First illumination unit, 207-First receiving lens barrel, 208-Second receiving lens barrel, 209-Mounting plate, 210-Set screw, 211-First LED illumination lamp, 212-First power cable, 213-First pressure ring, 214-Horizontal base plate;

[0040] 3-Emitting lens module, 301-Light source, 302-Second crosshair reticle, 303-Focus adjustment objective lens, 304-Emitting lens group, 305-Second illumination unit, 306-Mounting base, 307-Mounting hole, 308-External threaded retaining ring, 309-Internal threaded sleeve, 310-Second pressure ring, 311-First transmitting lens barrel, 312-Second transmitting lens barrel, 313-Fine adjustment screw, 314-Second LED illumination lamp, 315-Second power cable, 316-Vertical base plate, 317-Mounting screw;

[0041] 4-Sliding stage, 5-Guide limiting structure, 6-Push-pull handle. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] Please see Figures 1 to 10 As an embodiment of this application: a laser rangefinder ranging performance evaluation and testing device, characterized in that: it includes a fixed fixture 1, which conforms to the outer contour shape of the laser rangefinder under test, and in the fixed fixture 1, a simulated receiving mounting position 101 and a simulated transmitting and receiving position are respectively provided for the transmitting probe and receiving probe of the laser rangefinder under test; a receiving lens module 2 and a transmitting lens module 3 are respectively provided relative to the simulated receiving mounting position 101 and the simulated transmitting mounting position 102; wherein:

[0045] The receiving lens module 2 includes a receiving lens group 201, a first crosshair reticle 202, an optical attenuator 203, and a detector 204 arranged sequentially along the optical path emission direction of the laser rangefinder under test. The emitting end of the detector 204 uses the crosshair reference line of the first crosshair reticle 202 to complete the optical axis deviation angle calibration. Between the detector 204 and the receiving lens group 201, the distance between them is adjusted by a focal length fine-tuning structure 205 to fine-tune the focusing of the emitting end of the detector 204. A first illumination unit 206 is also provided relative to the first crosshair reticle 202.

[0046] The transmitting lens module 3 includes a light source 301, a second crosshair reticle 302, a focal length adjustment objective lens 303, and a transmitting lens group 304 arranged sequentially according to the simulated optical path emission direction. The light source 301 achieves fine adjustment of the optical axis deflection angle through a deflection fine adjustment mechanism to complete calibration under the indication of the second crosshair reticle 302. The distance between the focal length adjustment objective lens 303 and the transmitting lens group 304 is adjustable to change the beam expansion magnification. A second illumination unit 305 is also provided relative to the second crosshair reticle 302.

[0047] The working principle of this testing equipment is as follows: the laser beam emitted by the laser rangefinder under test enters the receiving lens module 2 through the simulated receiving mounting position 101. The laser beam first undergoes preliminary light focusing and adjustment through the receiving lens group 201, and then passes through the first crosshair reticle 202. Its crosshair reference lines facilitate optical axis deviation calibration, ensuring the light propagates in the correct direction. The light attenuator 203 is used to appropriately attenuate the intensity of the laser beam to suit the working range of the detector 204. The detector 204 receives the processed laser beam and converts the optical signal into an electrical signal for subsequent analysis and processing. During this process, the focus fine-tuning structure 205 can adjust the distance between the detector 204 and the receiving lens group 201 according to actual needs, thereby achieving fine-tuning of the focusing at the transmitting end of the detector 204 and ensuring measurement accuracy. The first illumination unit 206 provides sufficient light to the first crosshair reticle 202, making its crosshair reference lines clearer and facilitating calibration operations. For the transmitting lens module 3, the light emitted by the light source 301 propagates according to the simulated optical path emission direction. First, the light passes through the second crosshair reticle 302. The light source 301 fine-tunes the optical axis angle through an angle adjustment mechanism, completing calibration under the guidance of the second crosshair reticle 302 to ensure accurate light emission direction. Then, the light passes through the focal length adjustment objective lens 303 and the emitting lens group 304. The distance between the focal length adjustment objective lens 303 and the emitting lens group 304 is adjustable; changing this distance alters the beam expansion ratio to simulate laser emission under different distances and environments. The second illumination unit 305 provides illumination to the second crosshair reticle 302, making its indication clearer. This design enables the laser rangefinder performance evaluation and testing equipment to accurately simulate different measurement scenarios, providing a comprehensive and accurate evaluation of the laser rangefinder's ranging performance. By precisely adjusting and controlling parameters such as optical axis angle, focus, and beam expansion ratio, the performance of the laser rangefinder in actual use can be more realistically reflected, providing a reliable basis for the research, development, production, and quality inspection of laser rangefinders. Meanwhile, the fixing fixture 1 of the device matches the outer contour shape of the laser rangefinder under test, which can stably fix the device under test and reduce the impact of factors such as equipment shaking on the test results.

[0048] like Figures 6 to 7As shown, in specific implementation, the objective lenses in the receiving lens assembly 201 are respectively assembled in the first receiving lens barrel 207 via the first retaining ring 213, and the first crosshair reticle 202 is provided at the tail end of the first receiving lens barrel 207. This assembly method makes the installation of the receiving lens assembly 201 more stable, ensuring that the light can be accurately focused and adjusted through the receiving lens assembly 201. At the same time, the use of the first retaining ring 213 also facilitates the replacement and maintenance of the objective lenses. When the objective lens is damaged or needs cleaning, the operator can easily remove the first retaining ring 213 and take out the objective lens for corresponding processing. The crosshair reticle provided at the tail end of the first receiving lens barrel 207 provides an important reference for optical axis deviation calibration. In actual operation, the operator can clearly observe the relative positional relationship between the light and the crosshair reference line, thereby accurately judging whether the optical axis deviation meets the requirements and making corresponding adjustments. This design further improves the calibration accuracy of the entire testing equipment and ensures the reliability of the test results. Furthermore, the design of the first receiving lens barrel 207 facilitates the installation of subsequent components such as the focus fine-tuning structure 205 and the optical attenuator 203. It provides a stable mounting base for these components, enabling them to work closely together to process and analyze the laser beam. During subsequent use, the objective lenses of the receiving lens group 201 can be replaced or adjusted according to different testing needs. For example, for laser beams of different wavelengths, appropriate objective lenses can be selected to ensure the light focusing effect; for laser beams of different intensities, the intensity distribution of the light can be adjusted by changing the objective lenses. This flexibility allows the testing equipment to adapt to more testing scenarios, further improving its applicability and practicality. Meanwhile, to ensure the stability and durability of the first receiving lens barrel 207, high-strength, corrosion-resistant materials can be used in its manufacture. During the manufacturing process, dimensional accuracy and surface finish must be strictly controlled to ensure that the performance of the receiving lens group 201 is not affected. Similarly, the manufacturing of the first retaining ring 213 must ensure its precision and quality, enabling it to firmly fix the objective lens while facilitating disassembly and installation.

[0049] In this embodiment, the focus fine-tuning structure 205 includes a second receiving lens barrel 208 that is threadedly connected to the first receiving lens barrel 207. The detector 204 is mounted inside the second receiving lens barrel 208 via a mounting plate 209. By rotating the second receiving lens barrel 208, the distance between the receiving lens group 201 and the detector 204 can be adjusted. A set screw 210 is also provided between the second receiving lens barrel 208 and the first lens barrel 207 to limit the rotational position of the second receiving lens barrel 208. This design makes the focus fine-tuning operation more precise and convenient. When a focus fine-tuning is required, the operator only needs to loosen the set screw 210 and then rotate the second receiving lens barrel 208. Since the second receiving lens barrel 208 is threadedly connected to the first receiving lens barrel 207, during rotation, the second receiving lens barrel 208 will move along the axial direction of the first receiving lens barrel 207, thereby changing the distance between the receiving lens group 201 and the detector 204. Adjusting this spacing allows the detector 204 to receive a clearer and more accurate laser signal, thereby improving the accuracy of the testing equipment's evaluation of the laser rangefinder's ranging performance. After adjusting the appropriate focal length, the operator can tighten the set screw 210 to fix the second receiving lens tube 208 in its current position, preventing displacement due to vibration or other factors during subsequent testing and ensuring the stability and reliability of the test results. Furthermore, this focal length fine-tuning structure 205, which uses a threaded connection and set screw 210, offers good durability and maintainability. The threaded connection ensures smooth movement of the second receiving lens tube 208 during rotation, reducing wear. Simultaneously, the use of the set screw 210 simplifies the structure, facilitating disassembly and installation. When equipment malfunctions or requires maintenance, the second receiving lens tube 208 can be quickly adjusted or replaced, reducing maintenance costs and time. In addition, this focal length fine-tuning structure 205 can be combined with the aforementioned operation of changing or adjusting the objective lens according to different testing needs. After changing the objective lens, the focus may need to be readjusted. The focus fine-tuning structure 205 can quickly and accurately complete this operation, further improving the adaptability and flexibility of the testing equipment in different testing scenarios.

[0050] Specifically, an optical attenuator 203 is installed in the second receiving lens tube 208 between the first crosshair reticle 202 and the detector 204. The optical attenuator 203 plays a crucial role in the entire testing equipment. It can accurately attenuate the intensity of the laser beam according to actual needs. When the intensity of the laser beam emitted by the laser rangefinder under test is too high, the optical attenuator 203 can reduce its intensity to a range that the detector 204 can stably receive and process, avoiding saturation or damage to the detector 204 due to excessive laser intensity, thereby ensuring that the detector 204 can accurately convert the optical signal into an electrical signal for subsequent analysis. Moreover, the installation method of the optical attenuator 203 is convenient for disassembly and replacement. When facing laser beams of different intensities or different types of testing needs, operators can easily replace the optical attenuator 203 with different attenuation coefficients to achieve the best testing results. At the same time, in order to ensure the performance stability of the optical attenuator 203, its material selection and manufacturing process are subject to strict requirements. Materials with good optical properties and chemical stability are typically selected, and high-precision processing and coating are performed during manufacturing to ensure that the optical attenuator 203 maintains stable attenuation performance over long-term use, unaffected by external environmental factors. Furthermore, the optical uniformity of the optical attenuator 203 is also crucial. Uniform optical performance ensures consistent intensity attenuation of the laser beam across the entire cross-section, avoiding the impact of localized attenuation differences on the accuracy of test results. During actual testing, operators can flexibly adjust the attenuation level of the optical attenuator 203 based on the signal strength fed back by the detector 204. For example, when the signal received by the detector 204 is too weak, the attenuation coefficient of the optical attenuator 203 can be appropriately reduced; conversely, when the signal is too strong, the attenuation coefficient can be increased. This real-time adjustment method further enhances the adaptability and flexibility of the testing equipment, ensuring accurate and reliable test results under various testing conditions.

[0051] Specifically, the first illumination unit 206 includes a laterally arranged first LED light 211 and a first power cable 212. The first LED light 211 is installed through a first illumination hole pre-drilled in the wall of the second receiving lens barrel 208. Similarly, the second illumination unit 305 includes a laterally arranged second LED light 314 and a second power cable 315. The second LED light 314 is installed through a second illumination hole pre-drilled in the second mounting base 306. The arrangement of the first illumination unit 206 and the second illumination unit 305 is crucial for the calibration operation of the entire testing equipment. The first LED light 211 is installed on the wall of the second receiving lens barrel 208 through the first illumination hole. Its lateral arrangement allows it to illuminate the first crosshair reticle 202 at a suitable angle, enabling the operator to clearly see the relative position of the crosshair reference line and the transmitter end of the detector 204 when performing optical axis deflection calibration. The first power cable 212 provides a stable power supply to the first LED light 211, ensuring its normal illumination. Furthermore, this lateral mounting method facilitates the replacement and maintenance of the lighting fixtures. When the first LED lighting fixture 211 malfunctions, the operator can easily inspect or replace it through the first lighting hole. The second LED lighting fixture 314 is mounted laterally through the second lighting hole reserved on the second mounting base 306, also providing sufficient illumination for the second crosshair reticle 302. During the calibration process of the transmitting lens module 3, the light emitted by the light source 301 needs to be finely adjusted for optical axis deviation by cooperating with the second crosshair reticle 302. Clear crosshair reference lines help the operator more accurately determine whether the emission direction of the light source 301 meets the requirements, thereby completing the calibration operation. The second power cable 315 provides power support for the second LED lighting fixture 314, ensuring its continuous and stable operation. In order to ensure the stability and uniformity of the lighting effect, there are also certain requirements for the selection of the first LED lighting fixture 211 and the second LED lighting fixture 314. LEDs with stable luminous intensity and suitable color temperature are typically selected to ensure that the first and second crosshair reticles 202 and 302 are evenly illuminated, avoiding shadows or uneven brightness. The design of the first and second illumination holes is also ingenious, ensuring the installation of LEDs while preventing light leakage from interfering with other components. When installing the first LED illuminator 211 and the second LED illuminator 314, their installation position and angle must be strictly controlled to accurately illuminate the crosshair reticles, improving calibration accuracy and efficiency. Furthermore, in actual use, the brightness of the first LED illuminator 211 and the second LED illuminator 314 can be adjusted according to different ambient light conditions. For example, in dimly lit environments, the brightness can be increased; in brightly lit environments, the brightness can be decreased to ensure that the operator can clearly observe the crosshair reference lines.This adjustable lighting method further enhances the applicability of the testing equipment in different environments, ensuring accurate calibration and testing under various conditions. Simultaneously, to extend the lifespan of the LED lights, overcurrent and overvoltage protection devices can be installed in the lighting circuit to prevent damage to the LED lights due to abnormal current or voltage. Furthermore, regular inspection and maintenance of the LED lights and power cables allows for the timely detection and handling of potential faults, ensuring the normal operation of the lighting unit and providing strong support for the stable operation of the entire laser rangefinder performance evaluation testing equipment.

[0052] like Figures 8 to 10 As shown, in practical applications, both the light source 301 and the second crosshair dividing plate can be detachably mounted in the mounting holes 308 of the mounting base 306, and the optical axis of the light source 301 passes through the center of the crosshair reference line of the second crosshair dividing plate. This detachable assembly method has significant advantages. On the one hand, it facilitates the separate maintenance and replacement of the light source 301 and the second crosshair dividing plate. When the light source 301 exhibits abnormal light emission or the second crosshair dividing plate is damaged, it is not necessary to replace the entire mounting base 306; simply remove the corresponding component from the mounting hole 308 and replace it with a new component, greatly reducing maintenance costs and difficulty. On the other hand, under different testing requirements, different specifications of the light source 301 and the second crosshair dividing plate can be easily replaced. For example, for some high-precision ranging performance evaluation tests, it may be necessary to replace the light source 301 with one that has higher luminous intensity and better stability, as well as the second crosshair dividing plate with finer scale. Furthermore, since the optical axis of the light source 301 passes through the center of the crosshair reference line of the second crosshair dividing plate, it ensures that the light is accurately projected onto the target position, providing a precise light reference for evaluating the ranging performance of the laser rangefinder. During installation, strict assembly precision must be ensured to guarantee accurate alignment of the optical axis with the center of the crosshair reference line.

[0053] In specific implementation, the focus-adjusting objective lens 303 is installed within the internally threaded sleeve 309 via an externally threaded retainer, and its installation position can be controlled by rotating the externally threaded retainer. The transmitting lens assembly 304 is assembled and fixed using a second retaining ring 310. This installation method allows for highly flexible position adjustment of the focus-adjusting objective lens 303, enabling operators to precisely control its position within the equipment according to actual testing needs, thereby achieving precise adjustment of the light's focal length. By rotating the externally threaded retainer, the front-to-back position of the focus-adjusting objective lens 303 can be changed with fine precision to adapt to different requirements. The transmitting lens assembly 304 is assembled and fixed using the second retaining ring 310, ensuring the stability of the transmitting lens assembly 304 within the equipment. The second retaining ring 310 effectively prevents the transmitting lens assembly 304 from loosening or shifting during equipment operation, ensuring that the emitted light propagates stably and accurately. Furthermore, this installation method for the focus-adjusting objective lens 303 and the transmitting lens assembly 304 also facilitates equipment maintenance and upkeep. When the focus adjustment objective lens 303 malfunctions or needs to be replaced with a different lens, it can be easily removed by rotating the external threaded retainer. Similarly, for the transmitting lens assembly 304, if repair or replacement is required, the second retaining ring 310 can be loosened relatively easily. This design improves the maintainability of the equipment and reduces downtime caused by component damage or the need for adjustments.

[0054] In this embodiment, the probe emitting lens module 3 further includes a first emitting lens barrel 311 and a second emitting lens barrel 312, which are coaxially and detachably connected by mounting screws 317 to form a light guide channel. A mounting base 306 is provided at the first end of the first emitting lens barrel 311, and a focal length adjustment objective lens 303 and an emitting lens group 304 are respectively provided at the first and last ends of the second emitting lens barrel 312. This design makes the assembly and disassembly of the probe emitting lens module 3 more convenient. If the first emitting lens barrel 311 or the second emitting lens barrel 312 or any of the components assembled therein are damaged during use, they can be quickly replaced by unscrewing the mounting screws 317. Moreover, the coaxial and detachable connection ensures the stability and accuracy of the light guide channel, allowing light to propagate efficiently within the lens barrel along a preset path. The mounting base 306 provides a stable mounting foundation for the entire probe emitting lens module 3, allowing it to be firmly installed in the corresponding position on the testing equipment, preventing shaking or displacement during testing. The focus adjustment objective lens 303 and the transmitting lens group 304 are respectively located at the beginning and end of the second transmitting lens tube 312, enabling better focusing and emission of light. In actual laser rangefinder performance evaluation tests, adjusting the focus adjustment objective lens 303 can change the degree of light focusing, thereby simulating light propagation at different distances; the transmitting lens group 304 is responsible for stably and accurately emitting the focused light to achieve the purpose of testing the laser rangefinder performance. In particular, this layout makes it easier to individually debug and maintain the focus adjustment objective lens 303 and the transmitting lens group 304, further improving the practicality and reliability of the testing equipment.

[0055] Specifically, the optical axis deflection fine-tuning mechanism includes at least four fine-tuning screws 313 evenly distributed along the circumference of the first emitting lens barrel 311. Each fine-tuning screw 313 extends radially inward through a threaded hole in the wall of the first emitting lens barrel 311, and its end abuts against the mounting base 306 to achieve optical axis deflection compensation. By rotating the fine-tuning screw 313, it moves radially within the threaded hole, and the force exerted on the mounting base 306 by the end abutting against the mounting base 306 changes according to the direction and number of rotations. When optical axis deflection compensation is required, the operator can adjust the fine-tuning screw 313 at the corresponding position based on the actual measured optical axis deflection data. For example, if an optical axis deflection is detected in a certain direction, the fine-tuning screw 313 in that direction can be fine-tuned. By screwing in the fine-tuning screw 313, it applies greater pressure to the mounting base 306, pushing the mounting base 306 to produce a small displacement in the corresponding direction, thereby achieving optical axis deflection compensation. Furthermore, since the fine-tuning screws 313 are adjusted via threaded holes, this threaded connection method has excellent self-locking properties. Once adjusted to the appropriate position, it stably fixes the mounting base 306 in that position, preventing changes in the optical axis angle due to external vibrations or other factors during subsequent testing. In addition, this fine-tuning method offers high precision and flexibility. Operators can make small, precise adjustments as needed, gradually approaching the ideal optical axis angle to meet the testing requirements of different laser rangefinders. Simultaneously, due to the distribution and independent adjustment characteristics of the fine-tuning screws 313, even in cases with complex optical axis angles, effective compensation for the optical axis angle can be achieved by rationally combining and adjusting the fine-tuning screws 313 in different positions. This ensures that the testing equipment can accurately simulate light propagation under various actual conditions, improving the accuracy and reliability of laser rangefinder ranging performance evaluation tests.

[0056] Please see Figures 1 to 3In specific application scenarios, the receiving lens module 2 is fixed to a sliding stage 4 via a horizontal base plate 214. The sliding stage 4 is slidably connected via a guide limiting structure 5, and its sliding position is controlled by a push-pull handle 6, thereby correcting the relative relationship between the receiving lens module 2 and the simulated receiving mounting position 101. The transmitting lens module 3 is directly fixed to the simulated transmitting mounting position 102 via a vertical base plate 316. This installation method greatly facilitates the operation and adjustment of the entire testing equipment. The receiving lens module 2 is fixed to the sliding stage 4 via the horizontal base plate 214, allowing its position to be flexibly changed. The guide limiting structure 5 ensures the stability and accuracy of the sliding stage 4's movement, avoiding offset and shaking during the sliding process. The operator can easily control the sliding position of the sliding stage 4 via the push-pull handle 6, thereby accurately correcting the relative relationship between the receiving lens module 2 and the simulated receiving mounting position 101. The transmitting lens module 3 is directly fixed to the simulated transmitting mounting position 102 via a vertical base plate 316, ensuring the stability of the transmitting lens module 3. A stable transmitting position is crucial for accurately simulating the transmission of a laser rangefinder, reducing test errors caused by unstable transmitting positions. Furthermore, this layout of the receiving lens module 2 and the transmitting lens module 3 makes the overall structure of the test equipment more rational and compact. Within a limited space, the components can be arranged in an orderly manner, facilitating operation and improving testing efficiency. Moreover, this layout also promotes the integration and modular design of the equipment, making it easier to upgrade and expand in the future. During actual testing, the operator can first adjust the position and angle of the transmitting lens module 3 according to the specific parameters of the laser rangefinder under test and the test requirements, so that it accurately simulates the transmission state of the laser rangefinder. Then, the position of the receiving lens module 2 is adjusted using the push-pull handle 6 to ensure that its relative relationship with the simulated receiving mounting position 101 meets the test standards. During the adjustment process, the functions of the aforementioned focal length fine-tuning structure 205, light attenuator 203, illumination unit, and other components can be combined to further optimize the test conditions and improve the accuracy and reliability of the test results. Preferably, the guide limiting structure 5 includes a slide groove, and the sliding stage 4 is connected to the slide groove via locking bolts.

[0057] In summary, the design of this laser rangefinder ranging performance evaluation and testing equipment has many significant advantages:

[0058] In terms of focus control, the focal length is finely adjusted as needed using the focal length fine-tuning structure 205, thereby achieving precise matching of the focal lengths of the receiving lens group 201 and the detector 204. This enables accurate focusing in simulated measurement scenarios, significantly improving the accuracy of test results. This improvement solves the problem of fixed spacing between the receiving lens group 201 and the detector 204 in existing technologies, which prevents fine-tuning of the focal length, making the testing process more flexible and accurate.

[0059] To protect detector 204, the optical attenuator 203 effectively solves the problem of detector 204's vulnerability. When a high-intensity beam of light is incident on the receiving end of detector 204, the optical attenuator 203 can attenuate the beam, preventing detector 204 from being damaged by the high-intensity beam and improving the stability and reliability of the entire testing system.

[0060] In terms of beam control, the distance between the focal length adjustment objective lens 303 of the transmitting lens module 3 and the transmitting lens group 304 is adjustable, enabling changes in the beam expansion ratio. This means that in different ranging scenarios, the beam divergence angle parameter can be precisely adjusted according to actual needs, greatly improving the system's adaptability and testing accuracy. For example, in simulating a test scenario of close-range, high-reflectivity targets, the beam expansion ratio can be reduced to make the beam more focused, thereby obtaining more accurate test data; while in simulating a long-range, low-reflectivity target, the beam expansion ratio can be increased to allow the beam to cover a wider area, ensuring comprehensive testing.

[0061] Regarding the observation reference, both the receiving lens module 2 and the transmitting lens module 3 are equipped with illumination units. These illumination units provide illumination support for the crosshair reticle, ensuring good visual recognition of the crosshairs even in low-light environments or under complex lighting conditions, thereby improving the operator's alignment accuracy and work efficiency.

[0062] The design of the fixed fixture 1 ensures that the laser rangefinder under test can be accurately installed in the equipment. The simulated receiver mounting position 101 and the simulated transmitter mounting position 102 precisely correspond to the transmitter and receiver probes of the laser rangefinder under test, providing a stable and accurate foundation for the entire testing process. At the same time, the receiver lens module 2 can be flexibly adjusted in position according to the actual situation through the sliding stage 4 and the guide limiting structure 5, precisely matching the simulated receiver mounting position 101; the transmitter lens module 3 is firmly fixed on the simulated transmitter mounting position 102 through the vertical base plate 316, ensuring the stability of the transmission optical path.

[0063] Each component adopts a detachable design. For example, the objective lens of the receiving lens assembly 201 is assembled into the first receiving lens barrel 207 via the first retaining ring 213, the transmitting lens assembly 304 is assembled and fixed by the second retaining ring 310, and the first transmitting lens barrel 311 and the second transmitting lens barrel 312 are coaxially and detachably connected by mounting screws 317. This makes equipment maintenance and component replacement more convenient and efficient. In actual use, if a component malfunctions or requires performance upgrades, operators can quickly disassemble and replace the corresponding component, reducing equipment downtime and improving equipment utilization efficiency.

[0064] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A laser rangefinder ranging performance evaluation and testing device, characterized in that: The system includes a mounting fixture that conforms to the outer contour of the laser rangefinder under test. Within the fixture, corresponding to the transmitting and receiving probes of the laser rangefinder under test, simulated receiving and transmitting / receiving positions are respectively provided. A receiving lens module and a transmitting lens module are respectively provided relative to the simulated receiving and transmitting positions. The receiving lens module includes a receiving lens group, a first crosshair reticle, an optical attenuator, and a detector arranged sequentially along the optical path emission direction of the laser rangefinder under test. The emitting end of the detector uses the crosshair reference line of the first crosshair reticle to complete the optical axis deviation angle calibration. Between the detector and the receiving lens group, the distance between them is adjusted by a focal length fine-tuning structure to fine-tune the focusing of the emitting end of the detector. A first illumination unit is also provided relative to the first crosshair reticle. The transmitting lens module includes a light source, a second crosshair reticle, a focal length adjustment objective, and a transmitting lens group arranged sequentially according to the simulated optical path emission direction; the light source achieves fine adjustment of the optical axis deflection angle through a deflection fine adjustment mechanism to complete calibration under the indication of the second crosshair reticle; the distance between the focal length adjustment objective and the transmitting lens group is adjustable, thereby realizing the change of beam expansion magnification; a second illumination unit is also provided relative to the second crosshair reticle.

2. The laser rangefinder ranging performance evaluation and testing equipment according to claim 1, characterized in that: In the receiving lens assembly, the objective lenses are respectively assembled in the first receiving lens barrel through the first pressure ring, and the first cross-shaped reticle is provided at the tail end of the first receiving lens barrel.

3. The laser rangefinder ranging performance evaluation and testing equipment according to claim 2, characterized in that: The focal length fine-tuning structure includes a second receiving lens tube that is threadedly connected to the first receiving lens tube. The detector is mounted inside the second receiving lens tube by means of a mounting plate. By rotating the second receiving lens tube, the distance between the receiving lens group and the detector can be adjusted. A set screw for limiting the rotational position of the second receiving lens tube is also provided between the second receiving lens tube and the first lens tube.

4. The laser rangefinder ranging performance evaluation and testing equipment according to claim 3, characterized in that: A light attenuator is provided in the second receiving lens tube between the first crosshair reticle and the detector.

5. The laser rangefinder ranging performance evaluation and testing equipment according to claim 4, characterized in that: The first lighting unit includes a first LED light arranged laterally and a first power cable. The first LED light is installed through a first lighting hole reserved on the wall of the second receiving lens.

6. The laser rangefinder ranging performance evaluation and testing equipment according to any one of claims 1-5, characterized in that: Both the light source and the second cross-shaped engraving plate can be detachably mounted in the mounting holes of the mounting base, and the optical axis of the light source passes through the center of the cross-shaped reference line of the second cross-shaped engraving plate.

7. The laser rangefinder ranging performance evaluation and testing equipment according to claim 6, characterized in that: The focal length adjustment objective lens is installed in the internal threaded sleeve via an external threaded retainer, and its installation position can be controlled by rotating the external threaded retainer; the transmitting lens assembly is assembled and fixed by means of a second pressure ring.

8. The laser rangefinder ranging performance evaluation and testing equipment according to claim 7, characterized in that: The probe transmitting lens module also includes a first transmitting lens tube and a second transmitting lens tube, which are coaxially and detachably connected by mounting screws to form a light guide channel; a mounting base is provided at the first end of the first transmitting lens tube, and a focus adjustment objective lens and a transmitting lens group are respectively provided at the first and last ends of the second transmitting lens tube.

9. The laser rangefinder ranging performance evaluation and testing equipment according to claim 8, characterized in that: The deflection adjustment mechanism includes at least four fine-tuning screws evenly distributed along the circumference of the first emitting lens barrel. The fine-tuning screws extend radially inward through threaded holes opened on the wall of the first emitting lens barrel, and their ends abut against the mounting base to achieve optical axis deflection compensation.

10. The laser rangefinder ranging performance evaluation and testing equipment according to claim 1, 5, or 9, characterized in that: The receiving lens module is fixed to a sliding platform by means of a horizontal base plate. The sliding platform is slidably connected by a guide limiting structure, and the sliding position of the sliding platform is controlled by a push-pull handle to correct the relative relationship between the receiving lens module and the simulated receiving mounting position. The transmitting lens module is directly fixed to the simulated transmitting mounting position by means of a vertical base plate.

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