Multi-rectangular light ring photoacoustic detection combined light curtain measuring device and method

Abstract

The invention belongs to the field of outer ballistic parameter measurement, and particularly relates to a multi-rectangular light ring photoacoustic detection combined light curtain measurement device and method. The device comprises two multi-rectangular light ring photoacoustic detection combined light curtains which are parallel to each other; the multi-rectangular light ring photoacoustic detection combined light curtain comprises a rectangular detection light curtain and 2-N rectangular light ring photoacoustic detection devices, wherein the rectangular detection light curtain is sleeved with the rectangular light ring photoacoustic detection devices at equal intervals. The measurement method comprises the following steps: collecting a projectile shock wave signal, calculating an apparent velocity component of a shock wave in a detection light curtain, calculating a coordinate position and a coordinate difference value of a flying projectile, and calculating an azimuth angle gamma, a pitching projection angle gamma 2 and a pitching angle theta of the flying projectile when the flying projectile passes through a first multi-rectangular light ring photoacoustic detection combined light curtain; and calculating the velocity vector v of the flying projectile. The measuring device is simple, the measuring method is high in precision, the caliber and the incidence condition of the measured projectile are not restrained, the triggering signal is clear and clear, and the triggering uniqueness of the rectangular light ring photoacoustic detection device can be ensured.

Description

Technical Field

[0001] The invention belongs to the field of exterior ballistic parameter measurement, and in particular relates to a multi-rectangular light ring photoacoustic detection combined light curtain measurement device and method. Background Art

[0002] The external ballistic parameters of supersonic projectiles are an important part of the weapon damage effectiveness assessment, and also provide an important reference for the weapon shooting review and evaluation. Supersonic projectiles carry attached shock waves during flight, which will affect the detection light curtain at speeds slightly exceeding the speed of sound, making the trigger signal inaccurate, bringing new challenges to the measurement of flight parameters.

[0003] At present, the sky-curtain target measurement technology with the sky as the measurement background light source is the most widely used method for measuring weapon external ballistic parameters, but due to weather factors, the measurement sensitivity is low under sunny conditions without scattered light. The light curtain array measurement technology with array LED lights as the light source is currently the most accurate way to measure weapon external ballistic parameters, but because it is easily affected by the detached shock wave carried by supersonic projectiles with a speed slightly greater than the speed of sound, the changing radiation flux received by the photodetector at the receiving end is different from the changing radiation flux generated by the flying projectile blocking the light source. Under the condition of inappropriate threshold voltage setting, false triggering or signal correlation calculation errors are prone to occur. The dual CCD intersection measurement technology combined with two speed measurement light curtains can achieve the purpose of measuring weapon external ballistic parameters, but in addition to the speed measurement light curtain being affected by the detached shock wave, the imaging process may be affected by the detached shock wave when the flying projectile passes through the field of view of the CCD camera, resulting in additional shadows, causing the CCD camera to identify the wrong position.

[0004] Patent "ZL202211450015.9" uses four interference optical paths as measurement sensors to measure coordinate positions in the detection area. This method can obtain the coordinate parameters of supersonic projectiles, but it cannot measure information such as flight speed, pitch angle and azimuth, and it is impossible to measure parameters under the condition of non-vertical incidence detection surface. Patent "ZL202310065193.8" places the laser transmitting array and the photodetector receiving array in a sparse form to form a measurement sensor, and the coordinate position of the projectile can be measured within the detection surface. This method can obtain the outer ballistic parameters of supersonic projectiles, but there are the following problems: there is a false triggering situation when the projectile passes through the laser optical path, which requires additional judgment in the calculation process and increases the measurement complexity; the triggering moment of the entire measurement process is calculated by the moment when the shock wave triggers the laser optical path. If a simultaneous triggering occurs, it is impossible to judge the order of the triggering signals, resulting in erroneous measurement results. Summary of the invention

[0005] The present invention provides a multi-rectangular light ring photoacoustic detection combined light curtain measurement device and method to solve the problem in the prior art that the laser light path may be falsely triggered and the outer ballistic parameters of a projectile with a non-vertical incidence detection surface cannot be measured.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a multi-rectangular light ring photoacoustic detection combined light curtain measurement device, comprising two multi-rectangular light ring photoacoustic detection combined light curtains parallel to each other and with a spacing of H, collecting a projectile passing through the curtain signal and its shock wave signal;

[0007] Furthermore, the above-mentioned multi-rectangular light ring photoacoustic detection combined light curtain includes a rectangular detection light curtain in the same plane and 2 to N rectangular light ring photoacoustic detection devices arranged at equal intervals outside the rectangular detection light curtain, wherein the inner rectangular light ring photoacoustic detection device is arranged at a position that coincides with the edge of the rectangular detection light curtain;

[0008] The rectangular light ring photoacoustic detection device is composed of four linear photoacoustic detectors, which are composed of a linear laser emitter and a photoelectric detector with a spacing of L. The four linear photoacoustic detectors constitute the four sides of a rectangle.

[0009] Furthermore, the specific structure of the above-mentioned rectangular light ring photoacoustic detection device is as follows: four linear laser emitters are distributed at the four corners of the rectangle, and adjacent linear laser emitters are arranged perpendicular to each other in space; four photodetectors are distributed at the four corners of the rectangle, and adjacent photodetectors are arranged perpendicular to each other in space; the linear laser emitters and photodetectors arranged on the same side form a linear photoacoustic detector with a spacing of L, and the four groups of linear laser emitters and photodetectors at the four corners of the rectangle constitute a rectangular light ring photoacoustic detection device.

[0010] Furthermore, the specific structure of the above-mentioned rectangular halo photoacoustic detection device is as follows: four linear laser emitters are divided into two groups and are symmetrically distributed on the diagonals of the rectangle, two linear laser emitters are distributed perpendicularly to each other at one corner of the rectangle, and the other group of linear laser emitters is distributed at corresponding positions on the diagonal corner; four photoelectric detectors are arranged in the form of four linear laser emitters, and each group of photoelectric detectors and each group of linear laser emitters are arranged orthogonally to each other at the four corners of the rectangle.

[0011] The above-mentioned multi-rectangular light ring photoacoustic detection combined light curtain measurement method comprises the following steps:

[0012] Step 1: adjust the position of the linear laser emitter and align the laser light path. When the projectile passes through the rectangular detection light curtain, a trigger signal is generated, and the 2 to N rectangular light ring photoacoustic detection devices on the two multi-rectangular light ring photoacoustic detection combination light curtains begin to collect the projectile shock wave signal.

[0013] Step 2: Calculate the apparent velocity component v of the shock wave in the detection light curtain according to the triggering time of the photoacoustic detection devices of several rectangular light rings triggered by the shock wave. x+ 、v x- 、v y+ 、v y- ;

[0014] Step 3, calculate the coordinate position (x, y), (x', y') and coordinate difference (Δx, Δy) of the flying projectile in two multi-rectangular light ring photoacoustic detection combined light curtains;

[0015] Step 4: Calculate the azimuth angle γ and elevation projection angle γ of the flying projectile when it passes through the first multi-rectangular light ring photoacoustic detection combined light curtain 2 and its pitch angle θ;

[0016] Step 5: Calculate the velocity vector v of the flying projectile.

[0017] Furthermore, in the above second step, the calculation formula for the apparent velocity component is:

[0018]

[0019] Where S is the spacing distance between the rectangular light ring photoacoustic detection devices; v x+ 、v x- 、v y+ 、v y- are the apparent velocity components of the shock wave in the positive x-axis, negative x-axis, positive y-axis, and negative y-axis directions, respectively; the 1 to N in the subscripts represent the innermost to outermost rectangular light ring photoacoustic detection devices, respectively; the a, b, c, and d in the subscripts represent the left, bottom, right, and top directions, respectively, so t a1 ,t a2 、···、t an , t b1 ,t b2 、···、t bn , t c1 ,t c2 、···、t cn , t d1 ,t d2 、···、t dn They are respectively the triggering moments of the linear photoacoustic detector at the corresponding position of the rectangular light ring photoacoustic detection device triggered by the shock wave.

[0020] Furthermore, in the third step, the coordinate position (x, y) in the first multi-rectangular light ring photoacoustic detection combined light curtain, the coordinate position (x', y') of the second multi-rectangular light ring photoacoustic detection combined light curtain and their coordinate difference (Δx, Δy) are calculated as follows:

[0021]

[0022] Among them, t 0 The triggering moment of the first multi-rectangular light ring photoacoustic detection combined light curtain is triggered by the flying projectile; t' 0 The triggering moment of the second multi-rectangular light ring photoacoustic detection combined light curtain is triggered by the flying projectile; t' a1 , t' b1 They are respectively the triggering moments of the left and lower linear photoacoustic detectors of the innermost rectangular light ring photoacoustic detection device in the second multi-rectangular light ring photoacoustic detection combined light curtain triggered by the shock wave.

[0023] Furthermore, in the fourth step, the azimuth angle γ and the elevation projection angle γ of the flying projectile when passing through the first multi-rectangular light ring photoacoustic detection combined light curtain are 2 The calculation formula of its pitch angle θ is:

[0024]

[0025] Furthermore, in the fifth step above, the calculation formula for the flying projectile velocity vector v is:

[0026]

[0027] Compared with the prior art, the advantages of the present invention are:

[0028] (1) The measuring device is simple and the measuring method is highly accurate: the present invention uses several layers of N rectangular light ring photoacoustic detection devices arranged at equal intervals to improve the measurement accuracy of the shock wave apparent velocity, and has a coding function based on the position information, without the need to additionally determine the triggering sequence of the rectangular light ring photoacoustic detection device, thereby optimizing the calculation process and reducing the amount of calculation;

[0029] (2) There are no constraints on the caliber and incident conditions of the projectile being measured: Since this measurement method can measure the pitch angle and azimuth angle of the flying projectile passing through the first multi-rectangular light ring photoacoustic detection combined light curtain, there are no special requirements for the state of the flying projectile entering the detection light curtain. The external ballistic parameters can be measured under oblique incidence, and there are no requirements for the caliber of the projectile being measured.

[0030] (3) The trigger signal is clear and distinct: During the measurement process of the present invention, two detection light curtains provide a unified trigger signal, which can clearly provide the trigger sequence and avoid the errors caused by the trigger sequence judgment and calculation process in the combination calculation process of multiple linear photoacoustic detectors. At the same time, it avoids the problem of simultaneous triggering when the shock wave triggers the laser light path.

[0031] (4) Ensure the triggering uniqueness of the rectangular light ring photoacoustic detection device: Since the rectangular light ring photoacoustic detection device is arranged in layers around the detection light curtain in the same plane, the impact of the projectile on the laser light path is avoided when it passes through the detection light curtain, and the situation where the projectile triggers the laser light path is eliminated, ensuring that there are no special circumstances when the shock wave trigger is extracted later. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A diagram of a measuring device for the method of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of a combined light curtain for photoacoustic detection with multiple rectangular light rings;

[0034] Figure 3 It is a schematic diagram of a combined light curtain measurement device for photoacoustic detection of multiple rectangular light rings;

[0035] Figure 4 This is the measurement principle diagram of xoz projection surface;

[0036] Figure 5 This is the principle diagram of measurement within the YOZ projection plane.

[0037] Figure 6 Another structural schematic diagram of a rectangular light ring photoacoustic detection device.

[0038] The accompanying drawings are as follows:

[0039] 1-linear laser emitter; 2-photoelectric detector; 3-first detection light curtain; 4-rectangular light ring photoacoustic detection device; 5-first multi-rectangular light ring photoacoustic detection combination light curtain; 6-second multi-rectangular light ring photoacoustic detection combination light curtain, 7-second detection light curtain. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the technology of the present invention, the present invention will be described in detail below with reference to relevant drawings and embodiments.

[0041] See also Figure 1 The present invention provides a multi-rectangular light ring photoacoustic detection combined light curtain measuring device, comprising two multi-rectangular light ring photoacoustic detection combined light curtains parallel to each other and spaced at a distance H, specifically comprising a first multi-rectangular light ring photoacoustic detection combined light curtain 5 and a second multi-rectangular light ring photoacoustic detection combined light curtain 6, which are used to collect projectile passing curtain signals and shock wave signals thereof;

[0042] See also Figure 2The first multi-rectangular light ring photoacoustic detection combination light curtain 5 and the second multi-rectangular light ring photoacoustic detection combination light curtain 6 respectively include a rectangular detection light curtain in the same plane and N rectangular light ring photoacoustic detection devices 4 arranged at a spacing of S around the periphery of the rectangular detection light curtain, and the innermost rectangular light ring photoacoustic detection device 4 overlaps with the periphery of the rectangular detection light curtain; the rectangular detection light curtain includes a first detection light curtain 3 and a second detection light curtain 7.

[0043] The rectangular light ring photoacoustic detection device 4 is composed of four linear photoacoustic detectors, which are composed of a linear laser emitter 1 and a photoelectric detector 2 with a spacing L. The four linear photoacoustic detectors constitute the four sides of a rectangle.

[0044] One of the specific structures of the rectangular light ring photoacoustic detection device 4 is as follows: four linear laser emitters 1 are distributed at the four corners of the rectangle, and adjacent linear laser emitters 1 are arranged perpendicular to each other in space; four photodetectors 2 are distributed at the four corners of the rectangle, and adjacent photodetectors 2 are arranged perpendicular to each other in space; the linear laser emitters 1 and photodetectors 2 arranged on the same side form a linear photoacoustic detector with a spacing L, and the four groups of linear laser emitters 1 and photodetectors 2 on the four corners of the rectangle constitute a rectangular light ring photoacoustic detection device 4.

[0045] See also Figure 3 In this embodiment, two rectangular light ring photoacoustic detection devices 4 are included. The inner rectangular light ring photoacoustic detection device 4 is stacked on the edge of the rectangular detection light curtain, and the interval distance between the two rectangular light ring photoacoustic detection devices 4 is S.

[0046] The main optical axes of the linear photoacoustic detectors on the left and lower sides of the rectangular light ring photoacoustic detection device 4 inside the first detection light curtain 3 are respectively the x-axis and the y-axis. The first detection light curtain 3 and the second detection light curtain 7 are arranged in parallel at a distance H.

[0047] Based on the above device, see Figure 4 and Figure 5 The present invention provides a method for measuring a multi-rectangular light ring photoacoustic detection combined light curtain, comprising the following steps:

[0048] In the following description, a, b, c, and d represent four directions: left, bottom, right, and top, respectively; 1 and 2 represent the inner and outer rectangular light ring photoacoustic detection devices 4; the definitions of coordinate positions, curtain-crossing times, etc. in the second multi-rectangular light ring photoacoustic detection combination light curtain 6 are the same as those in the first multi-rectangular light ring photoacoustic detection combination light curtain 5; and each symbol is added with “'” to distinguish them.

[0049] Step 1: The inner and outer two rectangular light ring photoacoustic detection devices 4 on the first multi-rectangular light ring photoacoustic detection combined light curtain 5 and the second multi-rectangular light ring photoacoustic detection combined light curtain 6 begin to collect the shock wave signal of the projectile:

[0050] The flying projectile passes through the first multi-rectangular light ring photoacoustic detection combined light curtain 5, and the shock wave propagates in the first multi-rectangular light ring photoacoustic detection combined light curtain 5, passing through the two inner and outer linear photoacoustic detectors on the left, and the passing time is t a1 ,t a2 , v x- is the negative propagation velocity of the x-axis; it passes through the two linear photoacoustic detectors on the right side in sequence, and the passing times are t c1 ,t c2 , v x+ is the positive propagation speed of the x-axis; it passes through the two linear photoacoustic detectors on the lower side in sequence, and the passing time is t b1 ,t b2 , v y- is the negative propagation velocity of the y-axis; it passes through the two linear photoacoustic detectors on the upper side in sequence, and the passing time is t d1 ,t d2 , v y+ is the positive propagation velocity on the y-axis.

[0051] The flying projectile passes through the second multi-rectangular light ring photoacoustic detection combined light curtain 6, and the shock wave propagates in the second multi-rectangular light ring photoacoustic detection combined light curtain 6, passing through the two inner and outer linear photoacoustic detectors on the left, and the passing time is t' a1 , t' a2 , v x- is the negative propagation velocity of the x' axis; it passes through the two inner and outer linear photoacoustic detectors on the right in sequence, and the passing time is t' c1 , t' c2 , v x+ is the positive propagation speed of the x' axis; it passes through the two inner and outer linear photoacoustic detectors below in sequence, and the passing time is t' b1 , t' b2 , v y- is the negative propagation velocity of the y' axis; it passes through the two linear photoacoustic detectors above, and the passing time is t' d1 , t' d2 , v y+ is the positive propagation velocity on the y' axis.

[0052] Step 2: Calculate the apparent velocity component v of the shock wave in the detection light curtain according to the triggering time of the inner rectangular light ring photoacoustic detection device and the outer rectangular light ring photoacoustic detection device triggered by the shock wave. x+ 、v x- 、v y+ 、v y- ;

[0053]

[0054] Step 3, calculating the coordinate position (x, y), (x', y') and the coordinate difference (Δx, Δy) of the flying projectile in the first multi-rectangular light ring photoacoustic detection combined light curtain 5 and the second multi-rectangular light ring photoacoustic detection combined light curtain 6;

[0055]

[0056] Among them, t 0 The triggering moment of the first multi-rectangular light ring photoacoustic detection combined light curtain is triggered by the flying projectile; t' 0 The triggering moment of the second multi-rectangular light ring photoacoustic detection combined light curtain is triggered by the flying projectile; t' a1 , t' b1 They are respectively the triggering moments of the left and lower linear photoacoustic detectors of the inner rectangular light ring photoacoustic detection device 4 in the second multi-rectangular light ring photoacoustic detection combined light curtain 6 triggered by the shock wave;

[0057] Step 4: Calculate the azimuth angle γ and the elevation projection angle γ of the flying projectile when it passes through the first multi-rectangular light ring photoacoustic detection combined light curtain 5 2 and its pitch angle θ;

[0058]

[0059] Step 5: Calculate the velocity vector v of the flying projectile.

[0060]

[0061] See also Figure 6 , the specific structure of the rectangular light ring photoacoustic detection device 4 is as follows: four linear laser emitters 1 are divided into two groups, symmetrically distributed on the diagonals of the rectangle, two linear laser emitters are perpendicularly distributed at one corner of the rectangle, and another group of linear laser emitters are distributed at corresponding positions on the diagonals; four photodetectors 2 are arranged in the form of four linear laser emitters 1, but each group of photodetectors 2 and each group of linear laser emitters 1 are orthogonally arranged at the four corners of the rectangle. The above-mentioned embodiments are only preferred specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any simple change or equivalent replacement of the technical solution that can be obviously obtained by any technician familiar with the field within the technical scope disclosed in the present invention belongs to the protection scope of the present invention.

Claims

1. A multi-rectangular light ring photoacoustic detection combined light curtain measurement device, characterized in that: It includes two multi-rectangular light ring photoacoustic detection combined light curtains parallel to each other and with a spacing of H, which collect the projectile passing through the curtain signal and its shock wave signal; The multi-rectangular light ring photoacoustic detection combined light curtain comprises a rectangular detection light curtain in the same plane and 2 to N rectangular light ring photoacoustic detection devices (4) arranged at equal intervals outside the rectangular detection light curtain, wherein the inner rectangular light ring photoacoustic detection device (4) is arranged at a position that coincides with the edge of the rectangular detection light curtain; The rectangular light ring photoacoustic detection device (4) is composed of four linear photoacoustic detectors, which are composed of a linear laser emitter (1) and a photoelectric detector (2) with a spacing L, and the four linear photoacoustic detectors form the four sides of a rectangle.

2. A multi-rectangular light ring photoacoustic detection combined light curtain measurement device according to claim 1, characterized in that: The specific structure of the rectangular light ring photoacoustic detection device (4) is as follows: four linear laser emitters (1) are distributed at the four corners of the rectangle, and adjacent linear laser emitters (1) are arranged perpendicular to each other in space; four photoelectric detectors (2) are distributed at the four corners of the rectangle, and adjacent photoelectric detectors (2) are arranged perpendicular to each other in space; the linear laser emitters (1) and photoelectric detectors (2) arranged on the same side form a linear photoacoustic detector with a spacing L, and the four groups of linear laser emitters (1) and photoelectric detectors (2) at the four corners of the rectangle form a rectangular light ring photoacoustic detection device (4).

3. The multi-rectangular light ring photoacoustic detection combined light curtain measurement device according to claim 1, characterized in that: The specific structure of the rectangular light ring photoacoustic detection device (4) is as follows: four linear laser emitters (1) are divided into two groups and symmetrically distributed on the diagonals of the rectangle, two linear laser emitters are perpendicularly distributed at one corner of the rectangle, and another group of linear laser emitters are distributed at corresponding positions on the diagonal corner; four photoelectric detectors (2) are arranged in the form of four linear laser emitters (1), and each group of photoelectric detectors (2) and each group of linear laser emitters (1) are orthogonally arranged at the four corners of the rectangle.

4. The method for measuring a multi-rectangular light ring photoacoustic detection combined light curtain according to claim 1, characterized in that: The following steps are involved: Step 1: adjust the position of the linear laser emitter (1) to align the laser light path, wait for the projectile to pass through the rectangular detection light curtain, generate a trigger signal, and 2 to N rectangular light ring photoacoustic detection devices (4) on the two multi-rectangular light ring photoacoustic detection combined light curtains start to collect the projectile shock wave signal; Step 2: Calculate the apparent velocity component v of the shock wave in the detection light curtain according to the triggering time of the plurality of rectangular light ring photoacoustic detection devices (4) triggered by the shock wave. x+ 、v x- 、v y+ 、v y- ; Step 3, calculate the coordinate position (x, y), (x', y') and coordinate difference (Δx, Δy) of the flying projectile in two multi-rectangular light ring photoacoustic detection combined light curtains; Step 4, calculating the azimuth angle γ and the elevation projection angle γ2 and the elevation angle θ of the flying projectile when it passes through the first multi-rectangular light ring photoacoustic detection combined light curtain (5); Step 5: Calculate the velocity vector v of the flying projectile.

5. A multi-rectangular light ring photoacoustic detection combined light curtain measurement method according to claim 4, characterized in that: In the second step, the apparent velocity component is calculated as follows: Wherein, S is the spacing distance between the rectangular light ring photoacoustic detection devices (4); v x+ 、v x- 、v y+ 、v y- are the apparent velocity components of the shock wave in the positive direction of the x-axis, the negative direction of the x-axis, the positive direction of the y-axis, and the negative direction of the y-axis, respectively; the 1 to N in the subscripts represent the innermost to outermost rectangular light ring photoacoustic detection device (4), and the a, b, c, and d in the subscripts represent the left, bottom, right, and top directions, respectively, so t a1 ,t a2 、···、t an , t b1 ,t b2 、···、t bn , t c1 ,t c2 、···、t cn , t d1 ,t d2 、···、t dn They are respectively the triggering moments of the linear photoacoustic detectors at corresponding positions of the rectangular light ring photoacoustic detection device (4) triggered by the shock wave.

6. A multi-rectangular light ring photoacoustic detection combined light curtain measurement method according to claim 5, characterized in that: In the third step, the calculation formulas for the coordinate position (x, y) in the first multi-rectangular light ring photoacoustic detection combined light curtain (5), the coordinate position (x', y') of the second multi-rectangular light ring photoacoustic detection combined light curtain (6) and their coordinate difference (Δx, Δy) are: Among them, t0 is the triggering moment when the flying projectile triggers the first multi-rectangular light ring photoacoustic detection combined light curtain; t'0 is the triggering moment when the flying projectile triggers the second multi-rectangular light ring photoacoustic detection combined light curtain; t' a1 , t' b1 They are respectively the triggering moments of the left and lower linear photoacoustic detectors of the innermost rectangular light ring photoacoustic detection device (4) in the second multi-rectangular light ring photoacoustic detection combined light curtain (6) triggered by the shock wave.

7. A multi-rectangular light ring photoacoustic detection combined light curtain measurement method according to claim 6, characterized in that: In the fourth step, the calculation formulas for the azimuth angle γ, the elevation projection angle γ2 and the elevation angle θ of the flying projectile when passing through the first multi-rectangular light ring photoacoustic detection combined light curtain (5) are as follows:

8. A multi-rectangular light ring photoacoustic detection combined light curtain measurement method according to claim 7, characterized in that: In the fifth step, the calculation formula of the flying projectile velocity vector v is:

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