Non-contact artillery recoil measuring device based on laser triangulation method

Abstract

The utility model discloses a non-contact artillery recoil measuring device based on a laser triangulation method, which relates to the technical field of artillery recoil measurement and comprises a reflection assembly, a laser transmitter and a laser receiver, the reflection assembly is arranged on a movable artillery body, and the laser transmitter and the laser receiver are arranged on a fixed artillery support; the laser receiver comprises a receiving lens and a photoelectric detector; the receiving lens projects reflected light spots on the target surface of the photoelectric detector, so that the position information of the light spots is obtained, when the artillery shoots, the artillery body performs recoil motion to drive the reflection assembly to move, the spatial position of the light spots projected on the reflection assembly by the laser transmitter changes accordingly, and the position information of the light spots is obtained. And the positions of the light spots projected on the target surface received by the photoelectric detector are synchronously changed, and the backward displacement amount when the artillery is launched is obtained through calculation according to the difference of the positions of the light spots twice.

Description

Technical Field

[0001] The utility model relates to the technical field of infrared light source integration, in particular to a non-contact artillery recoil measuring device based on laser triangulation. Background Art

[0002] The maximum recoil distance of the artillery and the time for the artillery to recover from recoil are important data for judging whether the artillery firing is abnormal, whether the gun body is in place, the service life of the artillery and its sustained combat capability.

[0003] Currently, the existing methods for measuring the recoil distance of artillery are mostly to estimate it through the recoil mechanism pressure, or to measure it by installing a position sensor on the gun body. The method of estimating through the recoil mechanism pressure can only obtain a theoretical estimate value, and cannot give an exact measurement value; since the position sensor needs to be installed on the gun body, the sensor and the electronic device are directly affected by the acceleration impact when the artillery is fired, which makes the measurement accuracy of the detection device low and the service life short.

[0004] In view of this, there is an urgent need for a non-contact artillery recoil measurement device based on laser triangulation. Summary of the invention

[0005] In view of the problems existing in the prior art, the utility model solves the problems with the following technical structure.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A non-contact artillery recoil measuring device based on laser triangulation method, comprising: a reflection component, a laser transmitter and a laser receiver, wherein the reflection component is arranged on a movable gun body, the laser transmitter and the laser receiver are arranged on a fixed gun bracket, and the laser transmitter and the laser receiver are arranged on the gun body, and the optical axis of the laser transmitter, the normal line of the reflection component and the optical axis of the laser receiver are in the same plane;

[0008] The laser receiver comprises a receiving lens and a photoelectric detector, wherein the receiving lens is used to project the light spot reflected by the reflective component onto the photoelectric detector.

[0009] Its further characteristic is that

[0010] The reflection assembly comprises a baffle, and the baffle is arranged on the gun body.

[0011] The laser receiver also includes a filter arranged on a side of the receiving lens away from the photodetector.

[0012] The laser receiver also includes a timing module.

[0013] The laser receiver also includes a display module.

[0014] The photoelectric detector adopts a short-wave infrared movement.

[0015] The wavelength band of the photoelectric detector is 0.9 to 1.7 microns.

[0016] The refresh rate of the photodetector is 50 Hz.

[0017] The laser emitter emits laser light in a wavelength band of 1064 nanometers.

[0018] The laser emitter emits laser at a frequency of 25 kHz.

[0019] The above structure of the utility model can achieve the following beneficial effects:

[0020] When the artillery is in use, the laser transmitter and the laser receiver are turned on so that the light spot emitted by the laser transmitter is reflected by the reflective component to the laser receiver. The receiving lens projects the reflected light spot onto the target surface of the photoelectric detector, thereby obtaining the position information of the light spot. When the artillery is fired, the recoil movement of the gun body drives the reflective component to move. The spatial position of the light spot projected by the laser transmitter on the reflective component changes accordingly, and the position of the light spot received by the photoelectric detector projected on the target surface changes synchronously. From the difference in the two light spot positions, the backward displacement of the artillery when fired is calculated. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of this application;

[0022] Figure 2 It is a schematic diagram of the structure of the laser receiver in this application;

[0023] Figure 3 This is a schematic diagram of the related technology of this application.

[0024] In the figure: 1. Laser transmitter; 2. Receiving lens; 3. Photodetector; 4. Filter; 5. Timing module; 6. Display module; 7. Baffle. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0026] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0027] The following is combined with Figure 1-Figure 2 This application is described in further detail.

[0028] refer to Figure 1-Figure 2 A non-contact artillery recoil measuring device based on laser triangulation is shown, comprising: a reflection component, a laser transmitter 1 and a laser receiver, wherein the reflection component is arranged on a movable gun body, the laser transmitter 1 and the laser receiver are arranged on a fixed gun bracket, the laser transmitter 1 and the laser receiver are arranged on the gun body, the optical axis of the laser transmitter 1 and the normal of the reflection component and the optical axis of the laser receiver are in the same plane; the laser receiver comprises a receiving lens 2 and a photoelectric detector 3, the receiving lens 2 is used to project the light spot reflected by the reflection component onto the photoelectric detector 3, so that when the gun is used, the laser transmitter 1 and the laser receiver are turned on, so that the light spot emitted by the laser transmitter 1 is reflected by the reflection component to the laser receiver, The receiving lens 2 projects the reflected light spot onto the target surface of the photodetector 3, thereby obtaining the position information of the light spot. When the artillery fires, the gun body recoils and drives the reflective component to move. The spatial position of the light spot projected by the laser transmitter 1 on the reflective component changes accordingly, and the position of the light spot projected on the target surface received by the photodetector 3 changes synchronously. From the difference in the two light spot positions, the backward displacement of the artillery when firing is calculated (generally, the light spot position information is converted into an electrical signal by the photodetector 3 and transmitted to the computer for processing. The computer processes and calculates the difference in the electrical signals of the photodetector 3 before and after the artillery is fired (substitute into the formula for calculation), and the backward displacement of the artillery when firing is obtained).

[0029] The reflection component includes a baffle 7, which is arranged on the movable gun body. The baffle 7 has the function of reflecting the light spot from the laser emitter, and the baffle 7 can be composed of a reflecting mirror.

[0030] like Figure 2 As shown, the laser receiver also includes a filter 4 arranged on the side of the receiving lens 2 away from the photodetector 3. The filter 4 needs to perform filtering according to the working band of the specifically selected laser transmitter 1 to eliminate interference from other bands.

[0031] like Figure 2As shown, the laser receiver also includes a timing module 5. After receiving the electrical signal, the photoelectric detector 3 transmits the signal to the timing module for timing. At the same time, the processor is set to count the spot position information and time information from the beginning of recoil to the completion of reset during the entire artillery firing cycle, and the processor obtains accurate measurement values, recoil time and reset time after processing. In order to observe the measured data intuitively, the laser receiver also includes a display module 6, through the display screen of the display module 6, the measured time and distance data can be viewed.

[0032] Further optimization is that the photoelectric detector 3 uses a short-wave infrared movement. Considering the balance between performance and cost, a relatively mature uncooled infrared movement with a range of 0.9-1.7μm, a refresh rate of 50hz, a resolution of 640×512, and a pixel size of 12μm can be selected on the market. According to the different types of artillery being measured and the further requirements for accuracy and range, it can be replaced with an infrared movement with a smaller pixel size, higher resolution, and higher refresh rate. The advantages of choosing this type of photoelectric detector are: the short infrared band can avoid the interference of background light in outdoor working environments; the detector in this band can achieve better fog penetration, which helps to eliminate the influence of environmental flying dust on detection accuracy in outdoor working environments; this band is an eye-safe band.

[0033] Among them, the laser transmitter 1 can use a repetitive frequency laser with a wavelength of 1064nm and a frequency of 25khz. This type of laser has low cost, high power and good stability. The emitted laser needs to be able to project a small-sized spot on the baffle after passing through the collimation system.

[0034] For further optimization, the receiving lens 2 can be a lens group, and its main parameters need to meet the specific artillery recoil distance and accuracy requirements. In order to improve the detection accuracy of the device, the full field of view within the range of the receiving lens 2 needs to strictly control the distortion.

[0035] The specific operation method is combined with the attached Figure 3 As shown below:

[0036] Figure 3 The midpoint A is the intersection of the laser beam and the position of the moving front baffle, and the angle with the normal is γ. Point O is the center point of the receiving lens. The distance from the position of the moving front baffle to the center of the receiving lens is the preset value. Point A' is the intersection of the photoelectric detector target surface and the diffuse reflection beam. The angle between the beam AA' and the photoelectric detector target surface is β, and the angle with the normal is α. The distance from AO is l 1 , the distance between A′O is l 2 , the focal length of the receiving lens is f.

[0037] y is the distance from the front baffle position to the rear baffle position (i.e., the maximum recoil distance), point B is the intersection of the baffle and the laser emitter beam after the baffle moves to the maximum recoil distance, point B′ is the position of the laser projected on the photoelectric detector target surface after diffuse reflection from the baffle at the maximum recoil distance position, points C and D are the intersection points of the perpendicular line connecting points B, B′ and AA′, respectively, and x is the displacement distance of the light spot on the photoelectric detector target surface when the baffle moves to the maximum recoil distance.

[0038] Assume that the object distance is u and the image distance is v when the optical system forms an image. According to the imaging formula It can be seen that formula (1):

[0039]

[0040] According to the triangle similarity theorem, we can get formula (2):

[0041]

[0042] in, And because of formula (3):

[0043]

[0044] Substituting formula (1) and the above formulas into formula (2), we can obtain formula (4):

[0045]

[0046] Substituting formula (3) into formula (4) we can obtain formula (5):

[0047]

[0048] The remaining parameters in formula (5) are all known, and the accurate value can be calculated by the number of pixels that the spot photoelectric detector moves across and the pixel size.

[0049] The working principle of the utility model is as follows: when the artillery is used, the laser transmitter 1 and the laser receiver are turned on, so that the light spot emitted by the laser transmitter 1 is reflected by the reflection component to the laser receiver, and the receiving lens 2 projects the reflected light spot on the target surface of the photoelectric detector 3, thereby obtaining the position information of the light spot. When the artillery is fired, the recoil movement of the gun body drives the reflection component to move, and the spatial position of the light spot projected by the laser transmitter 1 on the reflection component changes accordingly, and the position of the light spot projected on the target surface received by the photoelectric detector 3 changes synchronously accordingly. From the difference in the positions of the two light spots, the amount of backward displacement of the artillery when firing is obtained by calculation;

[0050] This application is a non-contact measurement with high reliability and long service life;

[0051] This application uses an infrared detector as a measuring tool with high accuracy (the accuracy can reach d / 640, d is the estimated recoil travel);

[0052] When measuring this application, it will not be affected by bad weather such as rain, sand and dust;

[0053] This application is simple to operate, and the values ​​are easy to read and analyze;

[0054] This application has small size, light weight and low energy consumption (below 10w).

[0055] The above are only preferred embodiments of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A non-contact artillery recoil measurement device based on laser triangulation, characterized in that: include: A reflection component, a laser transmitter (1) and a laser receiver, wherein the reflection component is arranged on a movable gun body, the laser transmitter (1) and the laser receiver are arranged on a fixed gun bracket, and the laser transmitter (1) and the laser receiver are arranged on the gun body so that the optical axis of the laser transmitter (1), the normal of the reflection component and the optical axis of the laser receiver are in the same plane; The laser receiver comprises a receiving lens (2) and a photoelectric detector (3); the receiving lens (2) is used to project a light spot reflected by a reflective component onto the photoelectric detector (3).

2. The non-contact artillery recoil measurement device based on laser triangulation according to claim 1, characterized in that: The reflection component comprises a baffle (7), and the baffle (7) is arranged on the gun body.

3. The non-contact artillery recoil measurement device based on laser triangulation according to claim 1, characterized in that: The laser receiver also includes a filter (4) arranged on a side of the receiving lens (2) away from the photodetector (3).

4. The non-contact artillery recoil measurement device based on laser triangulation according to claim 1, characterized in that: The laser receiver also includes a timing module (5).

5. The non-contact artillery recoil measurement device based on laser triangulation according to claim 1, characterized in that: The laser receiver also includes a display module (6).

6. The non-contact artillery recoil measurement device based on laser triangulation according to claim 1, characterized in that: The photoelectric detector (3) adopts a short-wave infrared movement.

7. The non-contact artillery recoil measurement device based on laser triangulation according to claim 6 is characterized in that: The waveband of the photoelectric detector (3) is 0.9 to 1.7 micrometers.

8. The non-contact artillery recoil measurement device based on laser triangulation according to claim 6, characterized in that: The refresh rate of the photoelectric detector (3) is 50 Hz.

9. The non-contact artillery recoil measurement device based on laser triangulation according to claim 6, characterized in that: The laser emitter (1) emits laser light in a wavelength band of 1064 nanometers.

10. The non-contact artillery recoil measurement device based on laser triangulation according to claim 9, characterized in that: The laser emitter (1) emits laser light at a frequency of 25 kHz.

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