CN108061812B - A laser velocity measurement system and method for projectile velocity - Google Patents

Abstract

The invention discloses a laser speed measuring system for projectile velocity, which comprises a projectile tube, an impulse force trigger sensing device arranged close to the launching port of the projectile tube, a secondary laser speed measuring device arranged close to the projectile exit port, and an impulse force triggering sensing device arranged A primary laser speed measuring device, a rangefinder, a timing unit and a processing unit between the secondary laser speed measuring device, the rangefinder is respectively arranged between the impulse trigger sensing device and the primary laser speed measuring device, and the primary Between the laser speed measuring device and the secondary laser speed measuring device, the signal input end of the timing unit is respectively connected to the signal output end of the impulse trigger sensing device, the signal output end of the primary laser speed measuring device and the signal output end of the secondary laser speed measuring device connected, the signal output end of the timing unit is connected to the signal input end of the processing unit. The invention provides a projectile velocity laser velocity measuring system and method thereof, which can accurately measure the velocity of the projectile.

Description

A laser velocity measurement system and method for projectile velocity

technical field

The invention belongs to the field of laser velocity measurement, and in particular relates to a laser velocity measurement system and a method thereof for projectile velocity.

Background technique

In the process of ammunition design and production, the velocity of shells is one of the important technical indicators. Therefore, velocity measuring equipment is also a must-installed equipment for artillery and ammunition design and production departments. At present, there are many types of conventionally used speed measurement equipment, among which, based on the principle of section measurement, there are: on-off mesh target, coil target, sky screen target, frame laser target and so on. The measurement principle of this type of speed measuring equipment is: under the premise of knowing the target distance, measure the time of the projectile passing the target, and calculate the average speed at the midpoint of the target distance. In addition, there are solutions for measuring with the aid of speed-measuring radars, which use the Doppler principle for speed measurement. Due to various reasons, the existing speed measurement equipment based on the principle of section measurement basically has problems such as large error in the length of the on-site target distance, inaccurate measurement of the time of the projectile passing the target, or the limited range of the measured artillery caliber; and for Doppler speed measurement Radar has the problem of uncertainty in the position of the speed measuring point, and it is difficult to meet the accuracy requirements. In view of this, for those skilled in the art, how to improve the current situation of insufficient accuracy of the projectile velocity measurement process in the prior art has become an important problem that needs to be solved urgently.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a laser velocity measurement system and method for projectile velocity, which can accurately measure the velocity of projectiles.

Technical scheme: in order to achieve the above object, the technical scheme of the present invention is as follows:

A laser speed measuring system for projectile speed, comprising a bullet tube, an impulse trigger sensing device arranged near the launching port of the bullet tube, a secondary laser speed measuring device disposed near the projectile tube exit, an impulse trigger sensing device and a secondary laser A primary laser speed measuring device, a range finder, a timing unit and a processing unit between the speed measuring devices, the range finder is respectively arranged between the impulse trigger sensing device and the primary laser speed measuring device, and the primary laser speed measuring device and the primary laser speed measuring device Between the secondary laser speed measuring devices, the signal input end of the timing unit is respectively connected with the signal output end of the impulse trigger sensing device, the signal output end of the primary laser speed measuring device and the signal output end of the secondary laser speed measuring device. The signal output end of the timing unit is connected to the signal input end of the processing unit, and the signal output end of the impulse trigger sensing device is connected to the signal input end of the laser light source included in the primary laser speed measuring device and the secondary laser speed measuring device.

Further, the secondary speed measuring device includes a laser excitation module, a second beam splitter and a second photoelectric conversion module, the laser excitation module is arranged on the bomb tube, and the emitted laser light of the laser excitation module is perpendicular to the projectile flight path, the second photoelectric conversion module is arranged on the shell tube wall opposite to the laser excitation module, and the second photoelectric conversion module receives the emitted laser light; the second beam splitter is arranged on the laser excitation module The emitting end, and the second beam splitter divides the emitted light into two mutually perpendicular outgoing rays, one of which is directed to the second photoelectric conversion module, and the other is directed to the trigger sensing device and the primary laser speed measuring device.

Further, the primary speed measuring device includes a first beam splitter and a first photoelectric conversion module, and the first beam splitter and the first photoelectric conversion module are respectively arranged in parallel with the second beam splitter and the second photoelectric conversion module. on the tube, and the first beamsplitter is arranged on the path of the outgoing light after splitting by the second beamsplitter, and the first beamsplitter divides the splitting outgoing light into two beams of outgoing light perpendicular to each other, one of which towards the first photoelectric conversion module, and another beam towards the trigger sensing device.

Further, a light hole is provided inside the wall of the bomb tube, the light hole is arranged along the length direction of the bomb tube, and the two ends of the light hole are respectively connected to the second beam splitter and the impulse sensing trigger device. relative settings.

Further, the impulse trigger sensing device includes a socket plate, a strain gauge and a strain trigger plate, the socket plate is detachably inserted in the bullet tube, and the socket plate is penetrated with a bullet hole for the projectile to pass through. A hole is provided in the plug-in board with at least one side opening, and the cavity is perpendicular to the flight direction of the projectile; The strain gauge is connected, at least a part of the strain trigger plate extends into the bullet hole, and when the projectile passes through the bullet hole, it touches the strain trigger plate and causes the strain gauge to generate a strain signal; the strain gauge and the timing unit connect.

Further, the strain trigger sheet is a thin paper sheet, and the strain trigger sheet is arranged to cover the bullet hole, one side of the strain trigger sheet is pulled with the strain gauge, and the other side is fixed by a fixing member.

Further, the strain gauge is arranged horizontally on one side of the opening in the concave cavity, and the gap between the strain gauge and the two inner walls of the cavity is set, the strain gauge and the inner wall of the cavity form two gaps, and the strain trigger gauge One side can be inserted into one of the slits, and the other side can be bent and inserted into the other slit.

Further, a light-transmitting hole is opened on the wall of the plug-in board facing the side of the secondary laser speed measuring device, and the light-transmitting hole communicates with the concave cavity.

A method for a projectile speed laser speed measuring system: setting the impulse trigger sensing device close to the launching port of the bullet tube, setting the secondary laser speed measuring device close to the projectile tube exit, and setting between the impulse trigger sensing device and the secondary laser speed measuring device The first-level laser speed measuring device emits laser light through the laser excitation module, and the emitted light passes through the first beam splitter and the second beam splitter for splitting, so that the laser light passes through each optical path; The distance between the level speed measuring device and the distance between the impulse trigger sensor device;

After the projectile is launched, it first triggers the sensing device through the momentum, and at the same time triggers the timing unit to start timing. After that, the projectile passes through the first-level laser speed measuring device and the second-level laser speed measuring device in turn, and sequentially makes the timing unit step by step. Three time values and time Interval: The processing unit performs data processing according to the time interval and the distance measured by the rangefinder, and calculates the acceleration and speed.

Beneficial effects: the present invention measures the overall velocity in the bullet tube through two sets of laser velocity measuring devices and impulse trigger sensing devices, can measure the velocity, acceleration and initial velocity of the projectile, and use the same laser light source to measure the distance between targets, and at the same time Ensure the homology of the laser light path when passing the target, reduce the system error while simplifying the system structure, and the measurement of the time of the projectile passing the target has high accuracy, so that the accuracy of the velocity measurement of the projectile is high.

Description of drawings

Accompanying drawing 1 is the overall system schematic diagram of the present invention;

Accompanying drawing 2 is the explosion diagram of the impulse trigger sensing device of the present invention;

Accompanying drawing 3 is the semi-sectional schematic diagram of the impulse trigger sensing device of the present invention;

Accompanying drawing 4 is the partially enlarged schematic diagram of the impulse trigger sensing device of the present invention;

Accompanying drawing 5 is another view schematic diagram of the impulse trigger sensing device of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in accompanying drawing 1, a kind of laser velocity measurement system of projectile velocity, comprises bullet tube 1, the impulse force trigger sensing device 2 that is arranged near the launch port of the bullet tube, the secondary laser speed measurement device that is arranged near the launch port of the bullet tube, the setting A primary laser speed measuring device, a range finder 4, a timing unit 12 and a processing unit 11 between the impulse trigger sensing device 2 and the secondary laser speed measuring device, the range finder 4 is respectively arranged on the impulse trigger sensing device 2 Between the primary laser speed measuring device and between the primary laser speed measuring device and the secondary laser speed measuring device, the signal input end of the timing unit 12 is connected to the signal output end of the impulse trigger sensing device 2 and the signal output end of the primary laser speed measuring device respectively. The signal output end is connected to the signal output end of the secondary laser speed measuring device, and the signal output end of the timing unit 12 is connected to the signal input end of the processing unit 11 . The signal output end of the impulse trigger sensing device 2 is connected to the signal input end of the laser light source included in the primary laser speed measuring device and the secondary laser speed measuring device. In the case of device 2, the laser light source is triggered to emit laser light at the same time, so that the system is more automated, and the laser light source does not need to be manually turned on, saving manpower. The signal output end of the rangefinder 4 is connected to the signal input end of the processing unit, and the The instrument 4 can accurately measure the distance value between the primary laser speed measuring device, the secondary laser device and the impulse trigger sensing device 2. The rangefinder is a laser rangefinder. The ranging light source of the distance meter 4 not only reduces the components of the equipment, but also reduces ranging errors and system errors caused by different light sources, thereby improving the measurement accuracy of the system. At the same time, an impulse trigger sensing device is installed at the launch port of the bullet tube to replace the laser test device to reduce the degree to which the optical path is affected. Since the projectile will generate a lot of smoke and fire after launching, the laser light path closer to the bullet tube's snake opening will be damaged. The inaccuracy of the initial timing is caused by the interference of smoke or fire. Therefore, the impulse trigger sensing device 2 is used. This device is triggered when the projectile touches, which can avoid the interference of smoke or fire and improve the measurement accuracy.

The secondary speed measurement device includes a laser excitation module 7, a second beam splitter 9 and a second photoelectric conversion module 10, the laser excitation module 7 is arranged on the bomb tube 1, and the emitted laser light of the laser excitation module 7 is vertical In the flight path of the projectile, the second photoelectric conversion module 10 is arranged on the wall of the bomb tube opposite to the laser excitation module 7, and the second photoelectric conversion module 10 receives the emitted laser light; the second beam splitter 9 is arranged at the emitting end of the laser excitation module 7, and the second beam splitter 9 divides the emitted light into two beams of outgoing rays perpendicular to each other, one of which is directed towards the second photoelectric conversion module 10, and the other is directed towards the trigger Sensing device 2 and a laser speed measuring device. Through the second beam splitter 9, the emitted light is divided into one beam of outgoing light directed to the second photoelectric conversion module and the other outgoing light directed to the distance detection of the primary laser speed measuring device, which can accurately measure the primary laser measurement The distance between the device and the secondary laser measuring device or the distance between the secondary laser measuring device and the impulse trigger sensing device solves the technical difficulty of inaccurate measurement of the projectile passing the target distance.

The primary velocity measuring device includes a first beam splitter 5 and a first photoelectric conversion module 13, and the first beam splitter 5 and the first photoelectric conversion module 13 are spaced parallel to the second beam splitter 9 and the second photoelectric conversion module 10 respectively. It is arranged on the bomb tube 1, and the first beamsplitter 5 is arranged on the exit light path after the second beam splitter 9 splits, and the first beam splitter 5 divides the split exit light into two beams perpendicular to each other One of the emitted light rays is directed toward the first photoelectric conversion module 13 , and the other is directed toward the trigger sensing device 2 . The outgoing light is split again by the first spectroscope 5 to accurately measure the distance between the secondary laser measuring device and the impulse trigger sensing device. The first beamsplitter and the second beamsplitter are arranged at an angle of 45° relative to the direction of the bomb tube, and are all arranged in the wall of the bomb tube, and part of the light beam split by the beam splitter is irradiated on the photoelectric conversion module through the fine hole 6, The 6 optical slits in the fine hole can reduce the influence of other variegated light and diffuse light, and a condenser lens 8 is arranged at the exit end of the fine hole 6 .

The inside of the wall body of the bomb tube 1 is provided with a light hole 3, and the light hole 3 is arranged along the length direction of the bomb tube 1, and the two ends of the light hole 3 are respectively connected with the second beam splitter 9, the momentum The inductive trigger device 2 is relatively arranged. The first beam splitter 9 is arranged in the light hole 3, and the light hole is arranged in the wall of the bomb tube, which can reduce the influence of smoke and fire or other variegated light on the rangefinder measurement, and reduce the error. Improve ranging accuracy.

Through the measurement of the distance between each target by the range finder 4 and the measurement of the time of passing the target by the timing unit 12, the processing unit can perform data processing to obtain acceleration and average speed, etc., and can also calculate the speed values of the launch port and the exit port. It can measure the velocity change history in the bomb tube, and is suitable for the measurement of bomb tubes with different lengths and different calibers.

As shown in accompanying drawings 2 and 3, the impulse trigger sensing device 2 includes a socket board 23, a strain gauge 24 and a strain trigger sheet 22, and the socket board 23 is detachably inserted in the bomb tube 1, The socket plate 23 is provided with a bullet hole 21 for the projectile 14 to pass through, and the socket plate 23 is provided with a cavity 27 with at least one side open, and the cavity 27 is perpendicular to the flight direction of the projectile 14 The strain gauge 24 and the strain trigger piece 22 are all arranged in the concave cavity 27, the strain trigger piece 22 is connected with the strain gauge 24, and at least part of the strain trigger piece 22 extends into the bullet hole 21

When the projectile 14 passes through the bullet hole 21, it touches the strain trigger plate 22 and causes the strain gauge 24 to generate a strain signal; the strain trigger plate 22 can be a plastic sheet or a metal sheet that slightly protrudes. , the plastic sheet or metal sheet can be touched when the projectile passes through, and the strain gauge 24 is connected to the timing unit 12 to generate a strain signal. Calculate the time after the projectile passes through the impulse trigger sensing device. It is a mechanical structure, which is less affected by the environment and light conditions, and can be adapted to various occasions. When the projectile passes through the strain trigger plate, the strain trigger plate pulls the strain gauge to produce a stress change. , and the timing unit is clocked by the change of the resistance signal or the clock is processed by the strain gauge.

Two locating pins 26 are arranged at the bottom of the socket board 23, and positioning holes cooperating with the locating pins 26 are provided on the wall of the bomb tube 1, so that the socket board can still maintain a relatively stable position after each installation. position to reduce errors.

The strain trigger sheet 22 is a thin paper sheet, and the strain trigger sheet 22 is arranged to cover the bullet hole 21 , one side of the strain trigger sheet 22 is pulled and set with the strain gauge 24 , and the other side is fixed and set by a fixing member 25 . The fixing part 25 is a bolt, and the bolt is screwed and arranged on the socket plate and communicated with the cavity 27, so as to fix one side of the thin paper sheet, make it tight and generate a certain tension force, and when the projectile passes through Outdated, the impact force can make the thin paper trigger the strain gauge to generate a strain signal. At the same time, the thin paper is easy to obtain, cheap, convenient to use, and suitable for a large number of experiments. Moreover, the impact force of the projectile can easily break through the thin paper to avoid damage to the projectile. cause interference or loss of speed. Moreover, the thin paper sheet completely covers the bullet hole 21, which can also prevent the smoke or flash from the exit of the bullet barrel from interfering with other areas in the bullet barrel.

As shown in accompanying drawing 4, described strain gage 24 is horizontally arranged on the opening side in concave cavity 27, and described strain gauge 24 and two inner walls gaps of concave cavity 27 are arranged, and strain gauge 24 and the inner wall of concave cavity form two sides. One side of the strain trigger sheet 22 can be inserted into one of the slots 30 , and the other side can be bent and inserted into the other slot 30 . The installation is convenient, the structure is simple, and the triggering effect of the strain gauge can be better.

As shown in FIG. 5 , further, a light-transmitting hole 230 is opened on the wall of the plug-in board 23 facing the side of the secondary laser speed measuring device, and the light-transmitting hole 230 communicates with the concave cavity 27 . The light-transmitting hole 230 is used for the laser light in the light-through hole 3 to pass through, and make the laser light reach the strain trigger sheet, so as to ensure the accuracy of distance measurement.

A method for a projectile speed laser speed measuring system: setting the impulse trigger sensing device close to the launching port of the bullet tube, setting the secondary laser speed measuring device close to the projectile tube exit, and setting between the impulse trigger sensing device and the secondary laser speed measuring device The first-level laser speed measuring device emits laser light through the laser excitation module, and the emitted light passes through the first beam splitter and the second beam splitter for splitting, so that the laser light passes through each optical path; The distance between the level speed measuring device and the distance between the impulse trigger sensor device;

After the projectile is launched, it first triggers the sensing device through the momentum, and at the same time triggers the timing unit to start timing. After that, the projectile passes through the first-level laser speed measuring device and the second-level laser speed measuring device in turn, and sequentially makes the timing unit step by step. Three time values and time Interval: The processing unit performs data processing according to the time interval and the distance measured by the rangefinder, and calculates the acceleration and speed.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (6)

1. A laser velocity measuring system for projectile velocity, characterized in that: comprising a bomb tube (1), an impulse trigger sensor (2) arranged near the launch port of the bomb tube, and a secondary laser velocity measuring device positioned near the exit port of the bomb tube device, a primary laser speed measuring device arranged between the impulse trigger sensing device (2) and a secondary laser speed measuring device, a range finder (4), a timing unit (12) and a processing unit (11), the range finder (4) respectively arranged between the impulse trigger sensing device (2) and the first-level laser speed measuring device, between the first-level laser speed measuring device and the second-level laser speed measuring device, the signal input ends of the timing unit (12) are respectively It is connected with the signal output end of the impulse trigger sensing device (2), the signal output end of the first-level laser speed measuring device and the signal output end of the second-level laser speed measuring device, and the signal output end of the timing unit (12) is connected with the processing unit (11 ) is connected to the signal input end, and the signal output end of the impulse trigger sensing device (2) is connected to the signal input end of the laser excitation module included in the primary laser speed measuring device and the secondary laser speed measuring device; The secondary laser speed measuring device includes a laser excitation module (7), a second beam splitter (9) and a second photoelectric conversion module (10), the laser excitation module (7) is arranged on the bomb tube (1), and The emitted laser light of the laser excitation module (7) is perpendicular to the flight path of the projectile, the second photoelectric conversion module (10) is arranged on the wall of the bullet tube opposite to the laser excitation module (7), and the first Two photoelectric conversion modules (10) receive the emitted laser light; the second beam splitter (9) is arranged on the emission end of the laser excitation module (7), and the second beam splitter (9) divides the emitted light into two beams Outgoing rays perpendicular to each other, one of which is directed to the second photoelectric conversion module (10), and the other is directed to the impulse trigger sensing device (2) and the primary laser velocity measuring device; The first-level laser speed measuring device comprises a first beam splitter (5) and a first photoelectric conversion module (13), and the first beam splitter (5), the first photoelectric conversion module (13) are respectively connected with the second beam splitter ( 9), the second photoelectric conversion module (10) is arranged on the elastic tube (1) at a parallel distance, and the first beam splitter (5) is arranged on the outgoing light path after the splitting by the second beam splitter (9), and The first beam splitter (5) divides the splitted outgoing light into two mutually perpendicular outgoing light beams, one of which is directed to the first photoelectric conversion module (13), and the other is directed to the impulse trigger sensing device (2) ; The impulse trigger sensing device (2) includes a socket plate (23), a strain gauge (24) and a strain trigger plate (22), and the socket plate (23) is detachably inserted in the bullet tube (1) , the plug plate (23) is provided with bullet holes (21) through which the projectiles (14) pass, and the plug plate (23) is provided with a cavity (27) with at least one side open, so The cavity (27) is perpendicular to the flight direction of the projectile (14); the strain gauge (24) and the strain trigger plate (22) are all arranged in the cavity (27), and the strain trigger plate (22) and the strain gauge (24) connection, at least part of the strain trigger piece (22) extends into the bullet hole (21), and the projectile (14) touches the strain trigger piece when passing through the bullet hole (21) (22) and make the strain gauge (24) generate a strain signal; the strain gauge (24) is connected with the timing unit (12). 2. The laser velocity measurement system of a projectile velocity according to claim 1, characterized in that: a light hole (3) is provided inside the wall body of the bullet tube (1), and the light hole (3) It is arranged along the length direction of the bomb tube (1), and the two ends of the light through hole (3) are respectively arranged opposite to the second beam splitter (9) and the impulse trigger sensing device (2). 3. The laser velocity measuring system of a projectile velocity according to claim 1, characterized in that: the strain trigger sheet (22) is a thin paper sheet, and the strain trigger sheet (22) covers the bullet hole (21) Setting, one side of the strain trigger sheet (22) is pulled and set with the strain gauge (24), and the other side is fixedly set by the fixing piece (25). 4. The laser velocity measuring system of a projectile velocity according to claim 3, characterized in that: the strain gauge (24) is arranged on one side of the opening in the concave cavity (27), and the strain gauge (24) ) and the two inner wall gaps of the cavity (27), the strain gauge (24) and the inner wall of the cavity form two slits (30), and one side of the strain trigger plate (22) can be inserted into one of the slits (30) , and the other side is bent and inserted into another slit (30). 5. A projectile velocity laser velocity measuring system according to claim 1, characterized in that: a light-transmitting hole (230) is opened on the wall of the plug-in board (23) facing the side of the secondary laser velocity measuring device , the light-transmitting hole (230) communicates with the concave cavity (27). 6. A method for measuring projectile velocity by using the laser speed measurement system according to claim 1, characterized in that: the impulse trigger sensing device is arranged close to the launch port of the bullet tube, and the secondary laser speed measurement device is arranged close to the exit port of the bullet tube. A first-level laser speed measurement device is set between the impulse trigger sensing device and the second-level laser speed measurement device, and the laser excitation module emits laser light, and the emitted light is split through the first beam splitter and the second beam splitter, so that the laser light passes through each optical path; and Measure the distance between the first-level laser speed measuring device and the second-level laser speed measuring device, and the distance between the impulse trigger sensing device through the range finder; After the projectile is launched, it first triggers the sensing device through the momentum, and at the same time triggers the timing unit to start timing. After that, the projectile passes through the first-level laser speed measuring device and the second-level laser speed measuring device in turn, and sequentially makes the timing unit step by step. Three time values and time Interval: The processing unit performs data processing according to the time interval and the distance measured by the rangefinder, and calculates the acceleration and speed.

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