Ranging performance evaluation test equipment for laser range finder

Abstract

The invention discloses laser range finder range finding performance evaluation test equipment, which comprises a fixing jig, the fixing jig is matched with the outer contour shape of a to-be-tested laser range finder, and a simulation receiving installation position and a simulation transmitting and receiving position are respectively arranged in the fixing jig; a receiving lens module and a transmitting lens module are respectively arranged relative to the simulation receiving mounting position and the simulation transmitting mounting position; wherein the receiving lens module comprises a receiving lens group, a first cross scribed line reticle, a light attenuation sheet and a detector which are sequentially arranged along the light path emission direction of the laser range finder to be measured; and the emission lens module comprises a light source, a second cross-shaped scribed line reticle, a focal length adjusting objective lens and an emission lens group which are sequentially arranged according to the emission direction of the simulation light path. According to the invention, all aspects of focusing control, detector protection, light beam control and observation reference illumination are optimized and improved, and a more accurate, efficient and stable solution is provided for the performance simulation test of the laser range finder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser range finder detection, and particularly relates to a laser range finder ranging performance evaluation test equipment. BACKGROUND

[0002] Laser range finder simulation test is a crucial detection method, which can evaluate and verify various performance indicators of the laser range finder without actual and complex outdoor measurement.

[0003] Traditional laser range finder detection usually relies on actual environment test, however, there are many uncontrollable factors in the actual environment, such as weather, terrain, target characteristics, etc., which will interfere with the test results, making it difficult to accurately evaluate the real performance of the laser range finder. The simulation test can accurately simulate various real measurement scenes such as different distances and different reflectivities by constructing specific optical environment and target model.

[0004] In the laser range finder simulation test process, the performance of the transmitting lens module and the receiving lens module is the key element to determine the test accuracy of the whole system. After in-depth analysis, it is found that the existing technical solutions have significant limitations in many 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 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, the visual recognition of the crosshair line is significantly reduced in weak light environment or complex lighting conditions, which directly affects the alignment accuracy and work efficiency of the operator.

[0006] For the receiving lens module, first, in terms of focusing control, the receiving lens group and the detector adopt a fixed distance, which cannot be fine-tuned according to the demand to achieve accurate matching of the two. This makes it difficult to achieve precise focusing in the simulation measurement scene, thereby affecting the accuracy of the test results. Secondly, in terms of detector hardware design, there is an obvious vulnerability risk. When a high-intensity light beam is incident on the detector receiving end, the detector is easily damaged due to the lack of attenuation mechanism, affecting the stability and reliability of the whole test system. Finally, in terms of observation reference, the receiving lens module also has the disadvantage of illumination deficiency. SUMMARY

[0007] The purpose of the present application is to provide a laser range finder ranging performance evaluation test equipment, which aims to solve many problems existing in the simulation test of the existing laser range finder, and provide a more accurate, stable and efficient solution for the performance evaluation of the laser range finder. It overcomes the limitations of traditional equipment in focusing control, detector protection, beam control and observation reference through a series of unique designs and improvements.

[0008] To achieve the above purpose, the present application discloses a laser range finder ranging performance evaluation test equipment, which is characterized by: including a fixing jig, which is matched with the outer contour shape of the laser range finder to be tested, and in the fixing jig, corresponding to the transmitting probe and the receiving probe of the laser range finder to be tested, there are respectively provided a simulated receiving mounting position and a simulated transmitting receiving position; relative to the simulated receiving mounting position and the simulated transmitting mounting position, there are respectively provided a receiving lens module and a transmitting lens module; wherein:

[0009] The receiving lens module comprises a receiving lens group, a first cross-line reticle, an optical attenuation sheet and a detector arranged in sequence along the light path transmission direction of the laser range finder to be tested; the transmitting end of the detector completes the optical axis deflection angle calibration by using the cross reference line of the first cross-line reticle; between the detector and the receiving lens group, a focal length fine adjustment structure is further arranged to adjust the distance between the two, so as to fine tune the focus of the transmitting end of the detector; relative to the first cross-line reticle, a first illumination unit is further provided;

[0010] The transmitting lens module comprises a light source, a second cross-line reticle, a focal length adjustment objective lens and a transmitting lens group arranged in sequence according to the simulated light path transmission direction; the light source realizes the fine adjustment of the optical axis deflection angle through a deflection angle fine adjustment mechanism, so as to complete the calibration under the indication of the second cross-line reticle; the distance between the focal length adjustment objective lens and the transmitting lens group is adjustable, so as to realize the change of the beam expansion ratio; relative to the second cross-line reticle, a second illumination unit is further provided.

[0011] Further, the objective lenses in the receiving lens group are respectively assembled in the first receiving lens barrel through the first compression ring, and the first cross-line reticle is arranged at the tail end of the first receiving lens barrel.

[0012] Further, the focal length fine adjustment structure comprises a second receiving lens barrel which is threadedly connected with the first receiving lens barrel, and the detector is assembled in the second receiving lens barrel through a mounting plate; by rotating the second receiving lens barrel, the distance between the receiving lens group and the detector can be adjusted; a locking screw is further arranged between the second receiving lens barrel and the first lens barrel to limit the rotation position of the second receiving lens barrel.

[0013] Further, an optical attenuation sheet is arranged in the second receiving lens barrel between the first cross-line reticle and the detector.

[0014] Further, the first lighting unit comprises a first LED lighting lamp arranged laterally and a first power cable, and the first LED lighting lamp is installed through a first lighting hole reserved on the second receiving lens barrel wall.

[0015] Further, the light source and the second cross-line differentiation plate are detachably assembled in the mounting hole of the mounting seat, and the optical axis of the light source passes through the center of the cross reference line of the second cross-line differentiation plate.

[0016] Further, the focal length adjusting objective lens is installed in the internally threaded sleeve through an externally threaded snap ring, and the installation position thereof can be controlled by rotating the externally threaded snap ring; and the emission lens group is assembled and fixed by means of a second compression ring.

[0017] Further, the probe emission lens module further comprises a first emission lens barrel and a second emission lens barrel, which are coaxially and detachably connected through mounting screws to form a light guide channel; a mounting seat is arranged at the leading end of the first emission lens barrel, and a focal length adjusting objective lens and an emission lens group are arranged at the leading end and the trailing end of the second emission lens barrel, respectively.

[0018] Further, the deflection angle fine adjustment mechanism comprises at least four fine adjustment screws uniformly distributed along the circumference of the first emission lens barrel, which extend radially inward through the threaded holes arranged on the first emission lens barrel wall, and the distal ends of the fine adjustment screws hold the mounting seat to realize optical axis deflection angle compensation.

[0019] Further, the receiving lens module is fixed on a sliding table through a horizontal base plate, the sliding table is connected to the receiving lens module through a guide limiting structure to realize sliding connection, and the sliding position of the sliding table is controlled by a push-pull handle to correct the relative relationship between the receiving lens module and the simulated receiving installation position; and the emission lens module is directly fixed on the simulated emission installation position through a vertical base plate.

[0020] Compared with the prior art, the present application has the following remarkable effects:

[0021] (1) In the aspect of focus control, the focal length is finely adjusted according to requirements through the focal length fine adjustment structure, so as to realize accurate matching of the receiving lens group and the detector focal length. In this way, accurate focusing can be achieved in the simulated measurement scene, and the accuracy of the test results is effectively improved. This improvement solves the problem of fixed distance between the receiving lens group and the detector in the prior art, and the focal length cannot be fine adjusted, so that the test process is more flexible and accurate;

[0022] (2) For the detector protection, the setting of the light attenuation sheet effectively solves the problem of the detector being easily damaged. When a high-intensity light beam is incident on the receiving end of the detector, the light attenuation sheet can attenuate the light beam, avoiding damage to the detector caused by the high-intensity light beam, and improving the stability and reliability of the entire test system;

[0023] (3) In terms of light beam control, the spacing between the focal length adjustment objective lens and the emission lens group of the emission lens module is adjustable, which can realize the change of the beam expansion ratio. This means that in different ranging scenarios, the beam divergence angle parameters can be accurately adjusted according to actual needs, greatly improving the adaptability and test accuracy of the system. For example, in the test scenario of simulating a close-range, high-reflectivity target, the beam expansion ratio can be reduced to make the light beam more concentrated, so as to obtain more accurate test data; while in the simulation of a long-distance, low-reflectivity target, the beam expansion ratio is increased to make the light beam cover a larger range, ensuring the comprehensiveness of the test;

[0024] (4) In terms of observation reference, the receiving lens module and the emission lens module are each provided with an illumination unit. These illumination units provide illumination support for the crosshair reticle, ensuring that the crosshair has good visual recognition even in weak light environments or complex lighting conditions, improving the alignment accuracy and work efficiency of the operator;

[0025] (5) The fixed jig design ensures that the laser rangefinder to be tested can be accurately installed in the device, and the simulated receiving installation position and the simulated emission installation position accurately correspond to the emission probe and the receiving probe of the laser rangefinder to be tested, providing a stable and accurate basis for the entire test process. At the same time, the receiving lens module can be flexibly adjusted in position through the sliding table and the guide limiting structure, and accurately matched with the simulated receiving installation position; the emission lens module is firmly fixed on the simulated emission installation position through the vertical base plate, ensuring the stability of the emission light path;

[0026] (6) Each component is designed to be detachable, such as the objective lens of the receiving lens group assembled in the first receiving lens barrel through the first compression ring, the emission lens group assembled and fixed by means of the second compression ring, and the first emission lens barrel and the second emission lens barrel coaxially detachably connected through the mounting screws, which makes the maintenance and component replacement of the device more convenient and efficient. In actual use, if a component fails or needs to be upgraded, the operator can quickly disassemble and replace the corresponding component, reducing the downtime of the device and improving the efficiency of the device. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0028] Figure 1 is a front view of the laser range finder ranging performance evaluation test equipment in embodiment one;

[0029] Figure 2 is a top view of the laser range finder ranging performance evaluation test equipment in embodiment one;

[0030] Figure 3 is Figure 2 A-A sectional view in

[0031] Figure 4 is a schematic diagram of the internal structure of the receiving lens module in embodiment one (one);

[0032] Figure 5 is a schematic diagram of the internal structure of the receiving lens module in embodiment one (two);

[0033] Figure 6 is a front view of the receiving lens module in embodiment one;

[0034] Figure 7 is a top view of the receiving lens module in embodiment one;

[0035] Figure 8 is a schematic diagram of the internal structure of the transmitting lens module in embodiment one (one);

[0036] Figure 9 is a schematic diagram of the internal structure of the transmitting lens module in embodiment one (three);

[0037] Figure 10 is a front view of the transmitting lens module in embodiment one;

[0038] Figure reference: 1 - fixed jig, 101 - simulated receiving installation site, 102 - simulated transmitting installation site;

[0039] 2 - receiving lens module, 201 - receiving lens group, 202 - first crosshair reticle, 203 - light attenuation sheet, 204 - detector, 205 - focal length fine adjustment structure, 206 - first illumination unit, 207 - first receiving lens barrel, 208 - second receiving lens barrel, 209 - installation plate, 210 - set screw, 211 - first LED illuminating lamp, 212 - first power cable, 213 - first compression ring, 214 - horizontal base plate;

[0040] 3-emitting lens module, 301-light source, 302-second crosshair reticle, 303-focal length adjustment objective lens, 304-emitting lens group, 305-second illumination unit, 306-mounting seat, 307-mounting hole, 308-external thread snap ring, 309-internal thread sleeve, 310-second compression ring, 311-first emitting lens barrel, 312-second emitting lens barrel, 313-fine adjustment screw, 314-second LED illuminating lamp, 315-second power cable, 316-vertical base plate, 317-mounting screw;

[0041] 4-sliding table, 5-guiding limiting structure, 6-pull handle. DETAILED DESCRIPTION

[0042] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0043] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0044] Please refer to Figures 1 to 10 , as an embodiment of the present application: a laser range finder ranging performance evaluation test equipment, characterized by: including a fixing jig 1, the fixing jig 1 is matched with the outer contour shape of the laser range finder to be measured, and in the fixing jig 1, corresponding to the emitting probe and the receiving probe of the laser range finder to be measured, respectively, a simulated receiving mounting position 101 and a simulated emitting receiving position are arranged; relative to the simulated receiving mounting position 101 and the simulated emitting mounting position 102, a receiving lens module 2 and an emitting lens module 3 are respectively arranged; wherein:

[0045] The receiving lens module 2 comprises a receiving lens group 201, a first cross-line reticle 202, a light attenuation sheet 203 and a detector 204 arranged in sequence along the emission direction of the optical path of the laser range finder to be measured; the emission end of the detector 204 uses the cross reference line of the first cross-line reticle 202 to complete the optical axis deflection angle calibration; between the detector 204 and the receiving lens group 201, a focal length fine adjustment structure 205 is further arranged to adjust the distance between the two to fine tune the emission end focus of the detector 204; a first illumination unit 206 is further arranged relative to the first cross-line reticle 202;

[0046] The transmitting lens module 3 comprises a light source 301, a second cross-line reticle 302, a focal length adjustment objective 303 and a transmitting lens group 304 arranged in sequence along the emission direction of the analog optical path; the light source 301 realizes the fine adjustment of the optical axis deflection angle through a deflection angle fine adjustment mechanism to complete the calibration under the indication of the second cross-line reticle 302; the distance between the focal length adjustment objective 303 and the transmitting lens group 304 is adjustable to change the beam expansion ratio; a second illumination unit 305 is further arranged relative to the second cross-line reticle 302.

[0047] The working principle of the test equipment is that the laser beam emitted by the laser range finder to be tested enters the receiving lens module 2 through the simulated receiving installation site 101. The laser beam first passes through the receiving lens group 201 for preliminary light convergence and adjustment, and then passes through the first crosshair reticle scale plate 202, which can conveniently calibrate the optical axis deflection angle using its crosshair reference line to ensure that the light propagates in the correct direction. The light attenuation sheet 203 is used to properly attenuate the intensity of the laser beam to adapt to 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. In this process, the focal length fine adjustment structure 205 can adjust the distance between the detector 204 and the receiving lens group 201 according to actual needs, thereby realizing fine adjustment of the emission end focusing of the detector 204 and ensuring the accuracy of the measurement. The first illumination unit 206 provides sufficient light for the first crosshair reticle scale plate 202, making its crosshair reference line clearer and facilitating calibration operations. For the emission lens module 3, the light emitted by the light source 301 propagates in the direction of the simulated light path. First, it passes through the second crosshair reticle scale plate 302, and the light source 301 adjusts the optical axis deflection angle through the deflection angle fine adjustment mechanism, and completes the calibration under the indication of the second crosshair reticle scale plate 302, ensuring the accuracy of the light emission direction. Then the light passes through the focal length adjustment objective lens 303 and the emission lens group 304, and the distance between the focal length adjustment objective lens 303 and the emission lens group 304 is adjustable. By changing this distance, the expansion ratio can be changed to simulate laser emission under different distances and environments. The second illumination unit 305 provides illumination for the second crosshair reticle scale plate 302 to make the indication clearer. This design enables the laser range finder range performance evaluation test equipment to accurately simulate different measurement scenarios and comprehensively and accurately evaluate the range performance of the laser range finder. Through precise adjustment and control of parameters such as optical axis deflection angle, focusing, and expansion ratio, the performance of the laser range finder in actual use can be more realistically reflected, providing a reliable basis for the research and development, production, and quality detection of laser range finders. At the same time, the fixture 1 of the equipment is matched with the outer contour shape of the laser range finder to be tested, which can stably fix the equipment to be tested and reduce the influence of equipment shaking and other factors on the test results.

[0048] As preferred, in the laser range finder range performance evaluation test equipment, a simulated signal processing link that can be selected according to the target distance to be simulated is also configured, and the simulated signal processing link includes a short-distance simulation link and a long-distance simulation link:

[0049] If the target distance is less than or equal to 1km, a short-distance simulation link is enabled: a probe receives a laser ranging signal emitted by a laser rangefinder to be measured and converts the laser ranging signal into an electrical signal; the electrical signal is amplified and power-split; the power-split signal is modulated onto an optical fiber optical signal; the optical signal is delayed by an adjustable optical fiber delay line to simulate signal transmission distance; the delayed optical signal is converted back into an electrical signal; the electrical signal is amplified; and the amplified electrical signal is modulated onto a simulation ranging light signal of a light source.

[0050] If the target distance is greater than 1km, a long-distance simulation link is enabled: a probe receives a laser ranging signal emitted by a laser rangefinder to be measured and converts the laser ranging signal into an electrical signal; the electrical signal is high-speed ADC sampled; a high-speed FPGA is used to perform waveform fitting on the sampled signal; digital delay processing is performed according to a delay time set by a digital timer; a high-speed DAC is driven to output the delayed analog waveform; and the waveform output by the DAC is modulated onto a simulation ranging light signal of a light source.

[0051] As Figures 6 to 7As shown, in actual implementation, the objective lens in the receiving lens group 201 is assembled in the first receiving lens barrel 207 through the first compression ring 213, and the first crosshair reticle scale plate 202 is arranged at the tail end of the first receiving lens barrel 207. Such an assembly manner makes the installation of the receiving lens group 201 more stable, ensuring that the light can be accurately converged and adjusted through the receiving lens group 201. At the same time, the use of the first compression ring 213 also facilitates the replacement and maintenance of the objective lens. When the objective lens is damaged or needs to be cleaned, the operator can easily disassemble the first compression ring 213 and take out the objective lens for corresponding processing. The crosshair reticle scale plate arranged at the tail end of the first receiving lens barrel 207 provides an important reference for the optical axis angle calibration. In actual operation, the operator can clearly observe the relative position relationship between the light and the crosshair reference line, so as to accurately judge whether the optical axis angle meets the requirements and make corresponding adjustment. This design further improves the calibration accuracy of the entire test equipment and ensures the reliability of the test results. In addition, the design of the first receiving lens barrel 207 also provides convenience for the installation of the subsequent focal length fine adjustment structure 205 and the light attenuation sheet 203 and other components. It provides a stable installation foundation for these components, so that each component can tightly cooperate with each other and work together to complete the processing and analysis of the laser beam. In the subsequent use process, the objective lens of the receiving lens group 201 can also be replaced or adjusted according to different test requirements. For example, for laser beams of different wavelengths, appropriate objective lenses can be selected to ensure the convergence effect of the light; for laser beams of different intensities, the intensity distribution of the light can also be adjusted by replacing the objective lens. Such flexibility makes the test equipment adapt to more test scenarios, further improving its applicability and practicality. At the same time, in order to ensure the stability and durability of the first receiving lens barrel 207, high-strength and corrosion-resistant materials can be used for manufacturing. And in the manufacturing process, the dimensional accuracy and surface finish must be strictly controlled to ensure that the performance of the receiving lens group 201 is not affected. For the manufacturing of the first compression ring 213, the precision and quality must also be guaranteed, so that it can firmly fix the objective lens, and at the same time, it is convenient to disassemble and install.

[0052] In this embodiment, the focal length fine adjustment structure 205 comprises a second receiving lens barrel 208 threadedly sleeved with the first receiving lens barrel 207, and the detector 204 is assembled in the second receiving lens barrel 208 by means of 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; and a clamping screw 210 is arranged between the second receiving lens barrel 208 and the first lens barrel 207 to limit the rotation position of the second receiving lens barrel 208. Such a design makes the focal length fine adjustment operation more accurate and convenient. When it is necessary to fine adjust the focal length, the operator only needs to loosen the clamping screw 210 and then rotate the second receiving lens barrel 208. Since the second receiving lens barrel 208 is threadedly sleeved with the first receiving lens barrel 207, the second receiving lens barrel 208 will move along the axial direction of the first receiving lens barrel 207 during rotation, thereby changing the distance between the receiving lens group 201 and the detector 204. The adjustment of this distance can make the detector 204 receive clearer and more accurate laser signals, thereby improving the accuracy of the evaluation of the ranging performance of the laser range finder by the test equipment. After the appropriate focal length is adjusted, the operator can tighten the clamping screw 210 to fix the second receiving lens barrel 208 at the current position, so as to prevent it from being displaced due to vibration or other factors in the subsequent test process, and ensure the stability and reliability of the test results. Moreover, this focal length fine adjustment structure 205 with the threadedly sleeved and clamping screw 210 cooperation has good durability and maintainability. The threaded connection mode can ensure the smooth movement of the second receiving lens barrel 208 during rotation, reducing wear and tear. At the same time, the use of the clamping screw 210 makes the structure simple, facilitating disassembly and installation, and when the equipment fails or needs to be maintained, the second receiving lens barrel 208 can be quickly adjusted or replaced, reducing the maintenance cost and time cost of the equipment. In addition, this focal length fine adjustment structure 205 can also be combined with the above operation of replacing or adjusting the objective lens according to different test requirements. After replacing the objective lens, it may be necessary to re-adjust the focal length, at which time this focal length fine adjustment structure 205 can quickly and accurately complete this operation, further improving the adaptability and flexibility of the test equipment in different test scenarios.

[0053] Specifically, a light attenuation sheet 203 is arranged in the second receiving lens barrel 208 between the first crosshair reticle 202 and the detector 204. The light attenuation sheet 203 plays a key role in the entire test device. 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 range finder to be tested is too high, the light attenuation sheet 203 can reduce its intensity to the range that the detector 204 can stably receive and process, avoiding the saturation or damage of the detector 204 due to the excessively high intensity of the laser beam, so as to ensure that the detector 204 can accurately convert the optical signal into an electrical signal for subsequent analysis. Moreover, the light attenuation sheet 203 is installed in a detachable and replaceable manner. When facing laser beams with different intensities or different types of test requirements, the operator can conveniently replace the light attenuation sheet 203 with different attenuation coefficients to achieve the best test effect. At the same time, in order to ensure the performance stability of the light attenuation sheet 203, the selection of its material and the manufacturing process are strictly required. Generally, materials with good optical performance and chemical stability are selected, and high-precision processing and coating treatment are performed during the manufacturing process to ensure that the light attenuation sheet 203 can maintain stable attenuation performance during long-term use and is not affected by external environmental factors. In addition, the optical uniformity of the light attenuation sheet 203 is also very important. Uniform optical performance can ensure that the intensity of the laser beam attenuates uniformly across the entire cross section, avoiding the influence of local attenuation differences on the accuracy of the test results. In the actual test process, the operator can also flexibly adjust the attenuation degree of the light attenuation sheet 203 according to the signal intensity feedback by the detector 204. For example, when the signal received by the detector 204 is too weak, the attenuation coefficient of the light attenuation sheet 203 can be appropriately reduced; conversely, when the signal is too strong, the attenuation coefficient is increased. This real-time adjustment method can further improve the adaptability and flexibility of the test device, ensuring that accurate and reliable test results can be obtained under various test conditions.

[0054] Specifically, the first lighting unit 206 includes a first LED illuminating lamp 211 arranged laterally and a first power cable 212. The first LED illuminating lamp 211 is installed through a first lighting hole reserved on the wall of the second receiving lens barrel 208. Similarly, the second lighting unit 305 includes a second LED illuminating lamp 314 arranged laterally and a second power cable 315. The second LED illuminating lamp 314 is installed through a second lighting hole reserved on the second mounting seat 306. The arrangement of the first lighting unit 206 and the second lighting unit 305 is crucial for the calibration operation of the entire test device. The first LED illuminating lamp 211 is installed on the wall of the second receiving lens barrel 208 through the first lighting hole. The lateral arrangement of the first LED illuminating lamp 211 can illuminate the first crosshair reticle scale plate 202 at a suitable angle, so that the operator can clearly see the relative position relationship between the crosshair reference line and the emission end of the detector 204 when performing the optical axis deviation angle calibration. The first power cable 212 provides stable power supply for the first LED illuminating lamp 211, ensuring its normal lighting. Moreover, this lateral installation method facilitates the replacement and maintenance of the illuminating lamp. When the first LED illuminating lamp 211 fails, the operator can conveniently perform maintenance or replacement through the first lighting hole. The second LED illuminating lamp 314 is installed laterally through the second lighting hole reserved on the second mounting seat 306, and also provides sufficient illumination for the second crosshair reticle scale plate 302. In the calibration process of the emission lens module 3, the light emitted by the light source 301 needs to pass through the second crosshair reticle scale plate 302 to fine-tune the optical axis deviation angle. Clear crosshair reference lines can 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 illuminating lamp 314, ensuring its continuous and stable operation. In order to ensure the stability and uniformity of the illumination effect, there are certain requirements for the selection of the first LED illuminating lamp 211 and the second LED illuminating lamp 314. Generally, LED lamps with stable luminous intensity and appropriate color temperature are selected to ensure that the first crosshair reticle scale plate 202 and the second crosshair reticle scale plate 302 can be uniformly illuminated, avoiding the occurrence of shadows or uneven brightness. At the same time, the design of the first lighting hole and the second lighting hole also has ingenuity, which not only ensures the installation of the LED lamp, but also avoids the interference of light leakage to other components. When installing the first LED illuminating lamp 211 and the second LED illuminating lamp 314, the installation position and angle should be strictly controlled to accurately illuminate the crosshair reticle scale plate, improving the accuracy and efficiency of calibration. In addition, during actual use, the brightness of the first LED illuminating lamp 211 and the second LED illuminating lamp 314 can be adjusted according to different environmental light conditions. For example, in a relatively dark environment, the illumination brightness can be appropriately increased, and in a relatively bright environment, the brightness can be reduced to ensure that the operator can clearly observe the crosshair reference line.The adjustable lighting mode further enhances the applicability of the test equipment in different environments, ensuring accurate calibration and testing under various conditions. At the same time, in order to prolong the service life of the LED lamp, overcurrent and overvoltage protection devices can also be set in the lighting circuit to prevent damage to the LED lamp due to abnormal current or voltage. In addition, regular inspection and maintenance of the LED lamp and power cable can timely detect and handle potential faults, ensuring the normal operation of the lighting unit, thereby providing strong support for the stable operation of the entire laser range finder performance evaluation test equipment.

[0055] As shown in Figures 8 to 10 the actual application, the light source 301 and the second crosshair line differentiation plate are detachably assembled in the mounting hole 308 of the mounting seat 306, and the optical axis of the light source 301 passes through the crosshair reference line center of the second crosshair line differentiation plate. This detachable assembly method has significant advantages. On the one hand, it is convenient to maintain and replace the light source 301 and the second crosshair line differentiation plate separately. When the light source 301 has abnormal light emission or the second crosshair line differentiation plate is damaged, the entire mounting seat 306 does not need to be replaced, only the corresponding components need to be disassembled from the mounting hole 308, and the new components can be replaced, which greatly reduces the maintenance cost and difficulty. On the other hand, different specifications of light sources 301 and second crosshair line differentiation plates can be easily replaced under different testing requirements. For example, for some high-precision range performance evaluation tests, it may be necessary to replace the light source 301 with higher luminous intensity and better stability, and the second crosshair line differentiation plate with more precise scales. Moreover, since the optical axis of the light source 301 passes through the crosshair reference line center of the second crosshair line differentiation plate, it can ensure that the light is accurately projected to the target position, providing accurate light reference for the range performance evaluation of the laser range finder. During installation, the assembly precision must be strictly guaranteed to ensure accurate alignment of the optical axis and the crosshair reference line center.

[0056] In specific implementation, the focal length adjusting objective lens 303 is installed in the internally threaded sleeve 309 through an externally threaded snap ring, and its installation position can be controlled by rotating the externally threaded snap ring; the emission lens group 304 is assembled and fixed by means of the second compression ring 310. Such an installation mode makes the position adjustment of the focal length adjusting objective lens 303 very flexible, and the operator can accurately control its position in the device according to actual testing requirements, thereby realizing precise adjustment of the focal length of light. By rotating the externally threaded snap ring, the front and back positions of the focal length adjusting objective lens 303 can be changed in a fine degree to adapt to different requirements. The emission lens group 304 is assembled and fixed by the second compression ring 310, which ensures the stability of the emission lens group 304 in the device. The second compression ring 310 can effectively prevent the emission lens group 304 from loosening or shifting during the operation of the device, and ensure that the emitted light can be stably and accurately propagated. In addition, such an installation mode of the focal length adjusting objective lens 303 and the emission lens group 304 is also conducive to the maintenance and repair of the device. When the focal length adjusting objective lens 303 fails or needs to be replaced with a lens of different specifications, it can be easily disassembled by rotating the externally threaded snap ring; for the emission lens group 304, if it needs to be repaired or replaced, the second compression ring 310 can also be easily loosened for operation. Such a design improves the maintainability of the device and reduces the downtime of the device due to component damage or adjustment requirements.

[0057] In the embodiment, the probe emission lens module 3 further comprises a first emission lens barrel 311 and a second emission lens barrel 312, which are coaxially and detachably connected by means of mounting screws 317 to form a light guide channel; a mounting seat 306 is arranged at the leading end of the first emission lens barrel 311, and a focal length adjusting objective lens 303 and an emission lens group 304 are arranged at the leading end and the trailing end of the second emission lens barrel 312, respectively. This design makes the assembly and disassembly of the probe emission lens module 3 more convenient. If the first emission lens barrel 311 or the second emission lens barrel 312 or the components assembled therein are damaged during use, they can be quickly replaced by detaching them through the mounting screws 317. Moreover, the coaxial and detachable connection mode ensures the stability and accuracy of the light guide channel, so that the light can be efficiently propagated along the preset path in the lens barrel. The mounting seat 306 provides a stable mounting basis for the entire probe emission lens module 3, which can be firmly installed at the corresponding position of the test equipment to prevent shaking or displacement during testing. The focal length adjusting objective lens 303 and the emission lens group 304 are arranged at the leading end and the trailing end of the second emission lens barrel 312, respectively, which can better realize the functions of light focusing and emission. In the actual performance evaluation test of the laser range finder, the focusing degree of light can be changed by adjusting the focal length adjusting objective lens 303, thereby simulating the light propagation at different distances; the emission lens group 304 is responsible for stably and accurately emitting the focused light, so as to achieve the purpose of testing the performance of the laser range finder. In particular, this layout mode is more convenient for individual debugging and maintenance of the focal length adjusting objective lens 303 and the emission lens group 304, further improving the practicability and reliability of the test equipment.

[0058] Specifically, the declination fine adjustment mechanism includes at least four fine adjustment screws 313 evenly distributed along the circumference of the first emission lens barrel 311, which extend radially inward through the threaded holes in the barrel wall of the first emission lens barrel 311, and the tips of which hold the mounting seat 306 to achieve optical axis declination compensation. By rotating the fine adjustment screw 313, it moves radially in the threaded hole, and the tip of the mounting seat 306 changes the force acting on the mounting seat 306 according to the rotation direction and the number of turns. When optical axis declination compensation is needed, the operator can adjust the fine adjustment screw 313 at the corresponding position according to the actual measured optical axis declination data. For example, if the optical axis has a declination in a certain direction, the fine adjustment screw 313 in that direction can be adjusted. By screwing in the fine adjustment screw 313, it exerts more pressure on the mounting seat 306, pushing the mounting seat 306 to produce a slight displacement in the corresponding direction, thereby achieving compensation for the optical axis declination. Moreover, since the fine adjustment screw 313 is adjusted through the threaded hole, this threaded connection has good self-locking property, which can stably fix the mounting seat 306 at the appropriate position after adjustment, avoiding the optical axis declination from changing again due to external vibration and other factors during subsequent testing. In addition, this fine adjustment method has high precision and flexibility. The operator can make small and accurate adjustments as needed, gradually approaching the ideal optical axis angle, to meet the testing requirements of different laser range finders. At the same time, due to the distribution and independent adjustment characteristics of the fine adjustment screw 313, even in the case of complex optical axis declination, reasonable combination and adjustment of the fine adjustment screws 313 at different positions can achieve effective compensation for the optical axis declination, ensuring that the test equipment can accurately simulate the propagation of light in various actual situations, and improving the accuracy and reliability of the laser range finder ranging performance evaluation test.

[0059] Please refer to Figures 1 to 3In a specific application scenario, the receiving lens module 2 is fixed on a sliding table 4 by means of a horizontal base plate 214, the sliding table 4 is connected by sliding through a guide limiting structure 5, and the sliding position of the sliding table 4 is controlled by a push-pull handle 6, so as to correct the relative relationship between the receiving lens module 2 and the simulated receiving installation position 101; the transmitting lens module 3 is directly fixed on the simulated transmitting installation position 102 through a vertical base plate 316. This installation method provides great convenience for the operation and adjustment of the entire test equipment. The receiving lens module 2 is fixed on the sliding table 4 through the horizontal base plate 214, so that its position can be flexibly changed. The guide limiting structure 5 ensures the stability and accuracy of the sliding of the sliding table 4, avoiding deviation and shaking during sliding. The operator can easily control the sliding position of the sliding table 4 through the push-pull handle 6, so as to accurately correct the relative relationship between the receiving lens module 2 and the simulated receiving installation position 101. The transmitting lens module 3 is directly fixed on the simulated transmitting installation position 102 through the vertical base plate 316, ensuring the stability of the transmitting lens module 3. Stable transmitting position is crucial for accurately simulating the transmitting condition of the laser range finder, which can reduce the test error caused by unstable transmitting position. In addition, this layout of the receiving lens module 2 and the transmitting lens module 3 makes the structure of the entire test equipment more reasonable and compact. In a limited space, the components can be arranged in order, which is convenient for operation and can improve the test efficiency. Moreover, this layout is also conducive to the integration and modularization design of the equipment, facilitating the subsequent upgrading and expansion of the equipment. During the actual test process, the operator can adjust the position and angle of the transmitting lens module 3 according to the specific parameters and test requirements of the laser range finder to be tested, so as to accurately simulate the transmitting state of the laser range finder. Then, the position of the receiving lens module 2 is adjusted through the push-pull handle 6 to ensure that the relative relationship between it and the simulated receiving installation position 101 meets the test standard. During the adjustment process, the functions of the above-mentioned focal length fine adjustment structure 205, light attenuation sheet 203, illumination unit, etc. can be combined to further optimize the test conditions and improve the accuracy and reliability of the test results. As a preferred embodiment, the guide limiting structure 5 includes a sliding groove, and the sliding table 4 is connected with the sliding table through locking bolts.

[0060] In summary, the laser range finder ranging performance evaluation test equipment has many designs with significant advantages:

[0061] In terms of focus control, the focal length is finely adjusted according to the demand by means of the focal length fine adjustment structure 205, so as to realize the accurate matching of the focal length of the receiving lens group 201 and the detector 204. In this way, accurate focusing can be achieved in the simulated measurement scene, which effectively improves the accuracy of the test results. This improvement solves the problem of fixed interval between the receiving lens group 201 and the detector 204 in the prior art, which cannot fine-tune the focal length, making the test process more flexible and accurate;

[0062] For the protection of the detector 204, the arrangement of the light attenuation sheet 203 effectively solves the problem of the vulnerability of the detector 204. When a high-intensity light beam is incident on the receiving end of the detector 204, the light attenuation sheet 203 can attenuate the light beam, avoiding damage to the detector 204 due to high-intensity light beams, and improving the stability and reliability of the entire test system.

[0063] In terms of light 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, which can realize the change of the beam expansion ratio. This means that in different ranging scenarios, the beam divergence angle parameters can be accurately adjusted according to actual needs, greatly improving the adaptability and test accuracy of the system. For example, in the test scenario of simulating a close-range, high-reflectivity target, the beam expansion ratio can be reduced to make the light beam more concentrated, so as to obtain more accurate test data; while in the simulation of a long-distance, low-reflectivity target, the beam expansion ratio is increased to make the light beam cover a larger range, ensuring the comprehensiveness of the test;

[0064] In terms of observation reference, the receiving lens module 2 and the transmitting lens module 3 are each provided with an illumination unit. These illumination units provide illumination support for the crosshair reticle, ensuring that the crosshair has good visual recognition even in weak light environments or complex lighting conditions, improving the alignment accuracy and work efficiency of the operator;

[0065] The design of the fixed jig 1 ensures that the laser rangefinder to be tested can be accurately installed in the device, and the simulated receiving mounting position 101 and the simulated transmitting mounting position 102 accurately correspond to the transmitting probe and the receiving probe of the laser rangefinder to be tested, providing a stable and accurate basis for the entire test process. At the same time, the receiving lens module 2 can be flexibly adjusted in position through the sliding table 4 and the guide limiting structure 5, and accurately matched with the simulated receiving mounting position 101 according to actual conditions; the transmitting lens module 3 is firmly fixed on the simulated transmitting mounting position 102 through the vertical base plate 316, ensuring the stability of the transmitting light path;

[0066] Each component is designed to be detachable, for example, the objective lens of the receiving lens group 201 is assembled in the first receiving lens barrel 207 through the first compression ring 213, the transmitting lens group 304 is assembled and fixed by means of the second compression ring 310, and the first transmitting lens barrel 311 and the second transmitting lens barrel 312 are coaxially detachably connected through the mounting screw 317, etc., which makes the maintenance and component replacement of the device more convenient and efficient. In actual use, if a component fails or needs to be upgraded, the operator can quickly disassemble and replace the corresponding component, reducing the downtime of the device and improving the efficiency of the device.

[0067] The above disclosed is only a preferred embodiment of the present application, of course, cannot be limited by this to limit the scope of the present application, the person skilled in the art can understand that the implementation of all or part of the above-mentioned processes, and according to the equivalent changes of the claims of the present application, still belong to the scope covered by the present application.

Claims

1. A laser range finder ranging performance evaluation test apparatus, characterized by: The fixed jig is matched with the outer contour shape of the laser range finder to be tested, and an analog receiving mounting position and an analog emitting receiving position are respectively arranged in the fixed jig corresponding to the emitting probe and the receiving probe of the laser range finder to be tested; a receiving lens module and an emitting lens module are respectively arranged relative to the analog receiving mounting position and the analog emitting mounting position; wherein: The receiving lens module comprises a receiving lens group, a first cross-line scale plate, an optical attenuation sheet and a detector arranged in sequence along the emitting direction of the light path of the laser range finder to be tested; the emitting end of the detector completes the optical axis deflection angle calibration by using the cross reference line of the first cross-line scale plate; the distance between the detector and the receiving lens group is adjusted by the focal length fine adjustment structure to fine tune the focusing of the emitting end of the detector; a first illumination unit is further arranged relative to the first cross-line scale plate; The emitting lens module comprises a light source, a second cross-line scale plate, a focal length adjustment objective lens and an emitting lens group arranged in sequence according to the analog light path emitting direction; the light source realizes the fine adjustment of the optical axis deflection angle by the deflection angle fine adjustment mechanism to complete the calibration under the indication of the second cross-line scale plate; the distance between the focal length adjustment objective lens and the emitting lens group is adjustable to realize the change of the beam expansion ratio; a second illumination unit is further arranged relative to the second cross-line scale plate.

2. The laser rangefinder ranging performance evaluation test apparatus of claim 1, wherein: The objective lens of the receiving lens group is assembled in the first receiving lens barrel by the first compression ring, and the first cross-line scale plate is arranged at the tail end of the first receiving lens barrel.

3. The laser rangefinder ranging performance evaluation test apparatus of claim 2, wherein: The focal length fine adjustment structure comprises a second receiving lens barrel which is threadedly connected with the first receiving lens barrel, and the detector is assembled in the second receiving lens barrel by means of a mounting plate; the distance between the receiving lens group and the detector can be adjusted by rotating the second receiving lens barrel; a locking screw is further arranged between the second receiving lens barrel and the first lens barrel to limit the rotation position of the second receiving lens barrel.

4. The laser rangefinder ranging performance evaluation test apparatus of claim 3, wherein: An optical attenuation sheet is arranged in the second receiving lens barrel between the first cross-line scale plate and the detector.

5. The laser rangefinder ranging performance evaluation test apparatus of claim 4, wherein: The first illumination unit comprises a first LED illumination lamp arranged laterally and a first power cable, and the first LED illumination lamp is installed through the first illumination hole reserved on the barrel wall of the second receiving lens barrel.

6. The laser rangefinder ranging performance evaluation test apparatus according to any one of claims 1 to 5, characterized by: The light source and the second cross-line scale plate are detachably assembled in the mounting hole of the mounting seat, and the optical axis of the light source passes through the center of the cross reference line of the second cross-line scale plate.

7. The laser rangefinder ranging performance evaluation test apparatus of claim 6, wherein: The focal length adjustment objective lens is installed in the internally threaded sleeve by the externally threaded snap ring, and the installation position thereof can be controlled by rotating the externally threaded snap ring; the emitting lens group is assembled and fixed by the second compression ring.

8. The laser rangefinder ranging performance evaluation test apparatus of claim 7, wherein: The probe emitting lens module further comprises a first emitting lens barrel and a second emitting lens barrel, which are coaxially and detachably connected by means of a mounting screw to form a light guide channel; a mounting seat is arranged at the head end of the first emitting lens barrel, and a focal length adjustment objective lens and an emitting lens group are respectively arranged at the head end and the tail end of the second emitting lens barrel.

9. The laser rangefinder ranging performance evaluation test apparatus of claim 8, wherein: The fine adjustment mechanism of the deflection angle comprises at least four fine adjustment screws uniformly distributed along the circumference of the first transmitting lens barrel, which extend radially inward through the threaded holes formed on the wall of the first transmitting lens barrel, and the ends of the fine adjustment screws abut against the mounting seat to compensate for the deflection angle of the optical axis.

10. The laser rangefinder ranging performance evaluation test apparatus according to claim 1 or 5 or 9, characterized by: The receiving lens module is fixed on a sliding table by means of a horizontal base plate, the sliding table is connected to the receiving lens module through a guide limiting structure, and the sliding position of the sliding table is controlled by a push-pull handle to correct the relative relationship between the receiving lens module and the simulated receiving installation position; the transmitting lens module is directly fixed on the simulated transmitting installation position by means of a vertical base plate.

Images