CN111829396A - Laser light curtain speed measuring target used under water - Google Patents
Laser light curtain speed measuring target used under water Download PDFInfo
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- CN111829396A CN111829396A CN201910317860.0A CN201910317860A CN111829396A CN 111829396 A CN111829396 A CN 111829396A CN 201910317860 A CN201910317860 A CN 201910317860A CN 111829396 A CN111829396 A CN 111829396A
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- light curtain
- laser
- laser light
- light
- underwater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
- F41J5/00—Target indicating systems; Target-hit or score detecting systems
- F41J5/02—Photo-electric hit-detector systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
- F41J1/00—Targets; Target stands; Target holders
- F41J1/01—Target discs characterised by their material, structure or surface, e.g. clay pigeon targets characterised by their material
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- General Engineering & Computer Science (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses a laser light curtain speed measuring target used underwater, which can realize accurate measurement of the movement speed and passing position of underwater bullets with a simpler structure.
Description
Technical Field
The invention belongs to the technical field of underwater firearm testing, and particularly relates to a device for measuring underwater flying speed and position of a projectile.
Background
As a hotspot of the current global research, the underwater light weapon has very important social value and military significance for developing the technical research in related fields. When the external ballistic performance of an underwater weapon is researched, the flying speed and the landing coordinates of a projectile are important parameters for measuring the performance of the weapon. At present, there are many methods for measuring the flight speed of underwater projectiles, and the methods commonly used include coil target speed measurement, tin foil target speed measurement, high-speed photography speed measurement and light curtain target speed measurement. Among them, the light screen target velocimetry is popular with the broad masses of students because it does not directly contact with the moving projectile.
The light curtain target is a device for converting a received light signal into an electric signal, an instrument for detecting the moment when a flying projectile reaches a space designated position is provided, two light curtain targets are matched with a time measuring instrument and can be used for testing the flying speed of the projectile at a certain point, and a light curtain target speed measuring system is mainly divided into two parts, wherein one part is a light curtain structure which is provided with a light source, forms a light curtain through a series of optical devices and generates and transmits a light signal; the other is a photoelectric conversion system, which receives the optical signal from the light curtain, converts it into an electrical signal, amplifies and shapes it, and outputs it. The light curtain targets are generally placed on the preset tracks of the projectile in pairs, when the projectile passes through the light curtain, a part of the light curtain can be shielded, so that the electric signal generated by the photosensitive element is changed, and the photoelectric conversion system receives the electric signal with the mutation, amplifies and rectifies the electric signal and finally outputs the electric signal as a trigger signal of the time measuring instrument. The time measuring instrument records the time of the projectile passing through the two light curtains with fixed distance in front and back, and the speed of the projectile at the middle point of the two light curtain targets is measured and calculated. For light curtain constructions, the laser light is emitted from the emitting end and received at the detector end, thereby forming a light curtain therebetween, which typically has a certain thickness due to the divergence angle of the laser light.
Currently, there are three common light curtain structures. The first is a single high-power laser as a continuous light source, the laser passes through a laser beam splitter and a focusing mirror array to form a laser beam array, the effective range is about 1.5m by 1.5m, the diameter of the light beam is about 10mm, and the interval between adjacent light beams is 5 mm. The problem with this solution is that the power of the laser source is too high and is easily damaged; the beam splitter and the focusing collimation problem consume light intensity, influence light beam quality, make light curtain light intensity space go up to distribute unevenly, probably make detector digital signal produce the spurious triggering, entire system is totally airtight moreover, is unfavorable for overhauing and maintaining. The second kind is improved on the first kind, uses the multi-channel laser at the transmitting end, fixes on the rigid structure with equal space, the interface designs the X-Y fine adjustment, ensures the laser collimation; the same number of photoelectric detectors are arranged at the receiving end, and 1 to 1 laser signal is received, so that the design has the advantages that the problems of beam splitting and focusing collimation are avoided, the quality of laser is high, other lasers can still work after a single laser is damaged, and the spatial resolution is also high; the disadvantage is that it only spatially resolves the displacement of the projectile in the direction perpendicular to the laser beam, which is not detectable in the other direction. The third is to add the same laser array in the vertical direction of the laser beam in the second device to form another laser light curtain in the vertical direction, so that the displacement of the projectile in the two directions can be measured simultaneously.
Disclosure of Invention
The invention aims to provide a laser light curtain speed measuring target which can be used underwater, and the device can obtain the position and the speed of a projectile passing through the speed measuring target simultaneously.
The technical solution for realizing the purpose of the invention is as follows: a laser light curtain speed measurement target used underwater comprises a first laser light curtain, a second laser light curtain and signal acquisition and processing equipment, wherein the signal acquisition and processing equipment is placed on the shore, and the first laser light curtain and the second laser light curtain are respectively connected with the signal acquisition and processing equipment; when the laser bullet shooting device is used, the two sets of laser light curtains are arranged on the bullet track in parallel, so that bullets pass through the effective areas of the light curtains in the two light curtain frames, and the laser light directions of the two sets of laser light curtains are mutually perpendicular to form the adjacent horizontal laser light curtain and the vertical laser light curtain.
Compared with the prior art, the invention has the following remarkable advantages:
(1) the invention can simultaneously measure the speed and the two-dimensional position of the projectile underwater.
(2) In the invention, the speed and position measurement process can not directly contact with the projectile, and the measurement error can be obviously reduced.
(3) The invention does not need to design a complex light curtain system, has simple integral structure and is easy to realize.
Drawings
Fig. 1 is a three-dimensional schematic diagram of the overall structure of the underwater laser light curtain speed measurement target of the invention.
Fig. 2 is a partial schematic view of a single light curtain in the underwater laser light curtain speed measurement target of the present invention, wherein fig. 2a is a cross-sectional view of a horizontal light curtain, and fig. 2b is a cross-sectional view of a vertical light curtain.
Fig. 3 is a water-proof structure of a single laser transmitter in a laser transmitter array.
Detailed Description
A laser light curtain speed measuring target used underwater comprises a horizontal laser light curtain system 1, a vertical laser light curtain system 2, a signal collector and a signal processor 3. Wherein, 1.1 is a laser emitter array, 1.2 is a photoelectric detector array, and 1.3 is a packaging shell; 2.1 array of laser emitters, 2.2 array of photodetectors, 2.3 encapsulating housing. The laser emitter array is formed by arranging a certain number of same semiconductor lasers at equal intervals and is fixedly arranged on one side in the metal aluminum frame; the photoelectric detector array is correspondingly arranged at the other side in the metal aluminum frame. The photoelectric detector array and the laser emitter array are oppositely arranged on two sides in the metal frame and are respectively sealed in the metal frames on the two sides, and the side edge of the metal frame where the photoelectric detector is arranged is embedded with common glass for water prevention and receives light waves of the laser emitter. The photoelectric detector is connected in parallel with the signal controller. This is the structure of a single laser light curtain.
The invention has the structural characteristics that: the two laser light curtain structures are placed on the moving path of the projectile in parallel, the interval between the two laser light curtain structures cannot be too far (smaller than 0.5 m), wherein the two laser light curtains are placed in the horizontal direction and the vertical direction of laser light respectively, and when the projectile passes through the two laser light curtains, the laser light at the corresponding position can be blocked, so that the light flux received by the photoelectric detector changes, two electric signals are obtained, and the speed and the position of the projectile passing through can be obtained according to the distance between the front and the rear light curtain targets.
The invention will be further explained with reference to the drawings.
As shown in figure 1, the underwater laser light curtain velocity measurement target can be used for an underwater laser light curtain velocity measurement target, the whole measurement system consists of two sets of laser light curtain systems 1 and 2 and a signal acquisition and signal processing system 3, the two sets of laser light curtain systems are arranged on the motion track of a projectile 4 in a tandem and close manner, one set of laser light curtain systems is horizontally arranged according to the laser direction, the other set of laser light curtain systems is vertically arranged according to the laser direction, and the whole set of laser light curtain systems is arranged underwater.
As shown in fig. 2, fig. a and b are laser light curtain systems along the horizontal direction and the vertical direction respectively, the laser arrays 1.1 and 2.1 use blue-green laser, laser light starts from the laser arrays 1.1 and 2.1 at one side and is received by the corresponding photoelectric detector arrays 2.1 and 2.2 at the other side, and horizontal and vertical laser light curtains are formed in the middle of a rectangular metal frame respectively.
As shown in fig. 3, which shows the waterproof treatment of a single laser in a laser transmitter array, the laser 1.1.1 is placed in a cylindrical package casing 1.1.2, and a laser exit port is embedded in a glass panel 1.1.3; the same applies to the waterproof measure of the photoelectric detector. The laser is a blue-green laser which has the slowest attenuation under water.
With reference to fig. 1, in the above speed measurement target of the present invention, when the projectile passes through the two light curtains at a high speed, a part of light of the two light curtains is blocked sequentially, so that the photodetectors in the two sets of light curtain systems respectively detect the change of light flux to generate electrical signals, and according to the electrical signals generated by the photodetectors, the speed of the projectile can be obtained according to a speed calculation formula:
where s is the distance between the two light curtains and t is the time difference between the receipt of the two electrical signals. Secondly, in the system, two laser light curtains are arranged vertically to each other, and under the condition that the distance between the two laser light curtains is small enough, the laser light curtains vertically arranged in two directions can be approximately regarded as a coordinate system, and the two-dimensional position of the projectile passing through the light curtains can be obtained according to the electric signals obtained by the photoelectric detector array.
Claims (7)
1. The utility model provides a can be used to underwater laser light curtain target of testing speed which characterized in that: the system comprises a first laser light curtain (1), a second laser light curtain (2) and signal acquisition and processing equipment (3), wherein the signal acquisition and processing equipment (3) is placed on the shore, and the first laser light curtain (1) and the second laser light curtain (2) are respectively connected with the signal acquisition and processing equipment (3); when the laser bullet shooting device is used, the two sets of laser light curtains are arranged on the bullet track in parallel, so that bullets pass through the effective areas of the light curtains in the two light curtain frames, and the laser light directions of the two sets of laser light curtains are mutually perpendicular to form the adjacent horizontal laser light curtain and the vertical laser light curtain.
2. The underwater laser light curtain speed measurement target as claimed in claim 1, wherein: the first light curtain (1) and the second light curtain (2) are identical in structure, and the distance between the two sets of light curtains is smaller than 0.5 m.
3. The underwater laser light curtain speed measurement target as claimed in claim 1, wherein: the first light curtain (1) comprises a first laser emitter array (1.1), a first photoelectric detector array (1.2) and a first metal packaging shell (1.3); the first laser emitter array (1.1) is fixed on one side in the first metal packaging shell (1.3), the first photoelectric detector array (1.2) is correspondingly fixed on the other side in the first metal packaging shell (1.3), and laser starts from the first laser emitter array (1.1) after electrification and is received by the first photoelectric detector array (1.2);
the second light curtain (2) comprises a second laser emitter array (2.1), a second photoelectric detector array (2.2) and a second metal packaging shell (2.3), and laser starts from the second laser emitter array (2.1) and is received by the second photoelectric detector array (2.2).
4. The underwater laser light curtain speed measurement target as claimed in claim 3, wherein: the first metal packaging shell (1.3) and the second metal packaging shell (2.3) are rectangular.
5. The underwater laser light curtain speed measurement target as claimed in claim 3, wherein: and the side edge of the metal frame where the photoelectric detector is positioned is embedded with glass for water prevention and receives light waves of the laser emitter.
6. The underwater laser light curtain speed measurement target as claimed in claim 3, wherein: the laser array adopts a blue-green laser.
7. The underwater laser light curtain speed measurement target according to any one of claims 1-6, wherein: the two sets of light curtains are electrified, a horizontal light curtain and a vertical light curtain are respectively formed between the two metal frames, the shot (4) penetrates through the two light curtains, the luminous flux changes, a photoelectric detector on one side of each metal frame receives the changed light signals and converts the light signals into electric signals, and the signal acquisition and processing equipment (3) filters, amplifies and shapes the electric signals and outputs pulse signals; the two light screens respectively generate an electric signal, the position coordinate when the projectile passes through is obtained according to the two electric signals, and the distance s between the two light screens and the time difference t generated by the two electric signals are determined according to a speed formula:
the velocity v of the projectile as it passes through is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910317860.0A CN111829396A (en) | 2019-04-19 | 2019-04-19 | Laser light curtain speed measuring target used under water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910317860.0A CN111829396A (en) | 2019-04-19 | 2019-04-19 | Laser light curtain speed measuring target used under water |
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| CN111829396A true CN111829396A (en) | 2020-10-27 |
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| CN201910317860.0A Pending CN111829396A (en) | 2019-04-19 | 2019-04-19 | Laser light curtain speed measuring target used under water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899250A (en) * | 2021-09-15 | 2022-01-07 | 精兵特种装备(福建)有限公司 | Underwater target robot |
| CN115876041A (en) * | 2023-01-12 | 2023-03-31 | 西安工业大学 | Supersonic velocity target outer trajectory parameter measuring device and measuring method |
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| CN102680729A (en) * | 2012-05-18 | 2012-09-19 | 南京理工大学 | Speed measurement device for light curtain targets |
| CN102749470A (en) * | 2012-07-03 | 2012-10-24 | 南京理工大学 | Fragment velocity measuring device |
| CN104792262A (en) * | 2015-04-20 | 2015-07-22 | 张雅声 | Photosensitive plane target |
| CN106885917A (en) * | 2017-04-05 | 2017-06-23 | 西安工业大学 | Active velocity of shot detection light proscenia and Projectile velocity measurements method |
| CN108287252A (en) * | 2018-01-17 | 2018-07-17 | 中北大学 | It is a kind of under water using laser light curtain as the speed testing device of core and method |
-
2019
- 2019-04-19 CN CN201910317860.0A patent/CN111829396A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680729A (en) * | 2012-05-18 | 2012-09-19 | 南京理工大学 | Speed measurement device for light curtain targets |
| CN102749470A (en) * | 2012-07-03 | 2012-10-24 | 南京理工大学 | Fragment velocity measuring device |
| CN104792262A (en) * | 2015-04-20 | 2015-07-22 | 张雅声 | Photosensitive plane target |
| CN106885917A (en) * | 2017-04-05 | 2017-06-23 | 西安工业大学 | Active velocity of shot detection light proscenia and Projectile velocity measurements method |
| CN108287252A (en) * | 2018-01-17 | 2018-07-17 | 中北大学 | It is a kind of under water using laser light curtain as the speed testing device of core and method |
Non-Patent Citations (1)
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| 易治: ""阵列式激光光幕靶测速系统研制与应用"", 《防护工程》, vol. 34, no. 3, pages 12 - 15 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899250A (en) * | 2021-09-15 | 2022-01-07 | 精兵特种装备(福建)有限公司 | Underwater target robot |
| CN115876041A (en) * | 2023-01-12 | 2023-03-31 | 西安工业大学 | Supersonic velocity target outer trajectory parameter measuring device and measuring method |
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