CN103592458A - Laser light curtain blocking type speed measuring system for measuring light-gas gun millimeter-level bullet speed - Google Patents
Laser light curtain blocking type speed measuring system for measuring light-gas gun millimeter-level bullet speed Download PDFInfo
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- CN103592458A CN103592458A CN201310556457.6A CN201310556457A CN103592458A CN 103592458 A CN103592458 A CN 103592458A CN 201310556457 A CN201310556457 A CN 201310556457A CN 103592458 A CN103592458 A CN 103592458A
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Abstract
The invention discloses a laser light curtain blocking type speed measuring system for measuring light-gas gun millimeter-level bullet speed and belongs to the field of ground superspeed crash simulation experiments. The problem that an existing light-gas gun millimeter-level bullet speed measuring method is low in accuracy and low in success rate, repeated tests are needed, and accordingly testing cost is high is solved. The system comprises a laser velocimeter, a laser emitting device, a laser light curtain receiving device, a speed measuring signal display device and a speed measuring channel. The outlet end of a light-gas gun bullet launching device is connected with the speed measuring channel, the laser emitting device and the laser light curtain receiving device are arranged on the opposite faces of the speed measuring channel, a speed measuring signal output end of the laser light curtain receiving device is connected with a speed measuring signal input end of the laser velocimeter, and a display signal output end of the laser velocimeter is connected with a display signal input end of the speed measuring signal display device.
Description
Technical field
The present invention relates to a kind of experimental provision of measuring light-gas gun grade velocity of shot, belong to hypervelocity impact simulated experiment field, ground.
Background technology
In the experiment of light-gas gun hypervelocity impact, stroke speed is to describe space junk state, and therefore a most important parameters of analytical fragments and protection coating materials dynamic perfromance must accurately record the speed of testing bullet in the hypervelocity impact simulated experiment of ground.But in experiment, bullet emission rate is very high (general in the speed magnitude of several kms per second), size smaller (main research is grade bullet now), and bullet material comprises metal and nonmetal, so be an emphasis to the measurement of velocity of shot in experiment, it is also a difficult point.
Light-gas gun uses magnetic induction speed-measuring method to measure velocity of shot conventionally, this method is simple in structure, good economy performance, but bullet material must be conductor material, otherwise can not get induced signal, and when bullet volume is too small, the magnetic field of induced current can not cause the significant change in former magnetic field, thereby cause the failure of testing the speed.For addressing the above problem, people have been developed again laser velocimeter system and on light-gas gun, have been obtained successful Application.For laser velocimeter method, existing interrupter-type laser beam velocimetry has run into bullet off-axis cannot interdict light beam and the difficulty of the failure that causes testing the speed when too much.
The precision of said method is low, and when being less than aluminum bullet that 7km/s, quality be greater than 1.5mg and measuring for speed, success ratio is low, needs repeatedly revision test, causes experimentation cost very high.
Summary of the invention
The present invention seeks in order to solve existing light-gas gun grade velocity of shot measuring method precision low; Success ratio is low, needs revision test, causes the high problem of experimentation cost, provides a kind of for measuring the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot.
It is of the present invention that for measuring the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot, it comprises laser velocimeter, laser beam emitting device, laser light curtain receiving trap, tachometer signal display device and the passage that tests the speed,
The endpiece of light-gas gun projectile transmitting device connects the passage that tests the speed, test the speed on passage opposite face laser beam emitting device and laser light curtain receiving trap are set, the tachometer signal output terminal of laser light curtain receiving trap connects the tachometer signal input end of laser velocimeter, and the display output terminal of laser velocimeter is connected with the display input end of tachometer signal display device.
Advantage of the present invention: of the present inventionly can be less than aluminum bullet that 7km/s, quality be greater than 1.5mg to speed and carry out other precise speed of 0.01m/ level and measure for measuring the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot, improved the measuring accuracy of velocity of shot, reduced because of the inaccurate revision test producing of velocity survey, and then reduced experimentation cost.
Accompanying drawing explanation
Fig. 1 is of the present invention for measuring the structural representation of the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot;
Fig. 2 is of the present invention for measuring the bullet measuring principle figure of the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot;
Fig. 3 is the structural representation of red light semiconductor laser;
Fig. 4 is the right view of Fig. 3;
Fig. 5 is the structural representation of silicon photo diode photodetector;
Fig. 6 is the right view of Fig. 5;
Fig. 7 is the physical circuit figure of laser velocimeter.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, described in present embodiment for measuring the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot, it comprises laser velocimeter 1, laser beam emitting device 2, laser light curtain receiving trap 3, tachometer signal display device 4 and the passage 6 that tests the speed
The endpiece of light-gas gun projectile transmitting device 5 connects the passage 6 that tests the speed, test the speed on passage 6 opposite faces laser beam emitting device 2 and laser light curtain receiving trap 3 are set, the tachometer signal output terminal of laser light curtain receiving trap 3 connects the tachometer signal input end of laser velocimeter 1, and the display output terminal of laser velocimeter 1 is connected with the display input end of tachometer signal display device 4.
Embodiment two: present embodiment is described further embodiment one, laser beam emitting device 2 comprises n red light semiconductor laser 2-1, laser light curtain receiving trap 3 comprises n silicon photo diode photodetector 3-1, n red light semiconductor laser 2-1 and n silicon photo diode photodetector 3-1 form the transmitting of n group light curtain and receive structure, the light curtain of n group light curtain transmitting reception structure is parallel, every group of light curtain transmitting receives structure and comprises 1 red light semiconductor laser 2-1 and 1 silicon photo diode photodetector 3-1, the light curtain that this group light curtain transmitting receives the red light semiconductor laser 2-1 transmitting in structure is received by the silicon photo diode photodetector 3-1 in this group, n is natural number, and n=3-10.
The height of the laser beam emitting device 2 light curtain that obtains is 20mm, and width is 2mm, and wavelength is 650nm, and light intensity can regulate.
The photosurface diameter of laser light curtain receiving trap 3 is 1mm, and the response time is 22ns, and sensitivity is 0.62 μ A/ μ W, and dark current is 50nA, and junction capacity is 30pf, and response spectrum scope is 400 μ m～1100 μ m.
Embodiment three: present embodiment is described below in conjunction with Fig. 7, present embodiment is described further embodiment one or two, laser velocimeter 1 comprises tachometer signal I/V change-over circuit 7 and signal amplification circuit 8, the tachometer signal input end of tachometer signal I/V change-over circuit 7 connects the tachometer signal output terminal of laser light curtain receiving trap 3, the voltage signal output end of tachometer signal I/V change-over circuit 7 connects the voltage signal input end of signal amplification circuit 8, and the output terminal of signal amplification circuit 8 connects the display input end of tachometer signal display device 4.
Embodiment four: present embodiment is described below in conjunction with Fig. 3 and Fig. 4, present embodiment is described further embodiment one, two or three, and red light semiconductor laser 2-1 comprises laser instrument 2-1-1, the first rotatable sleeve 2-1-2, the first convex lens 2-1-3 and the first grating 2-1-4; The light-emitting window of laser instrument 2-1-1 connects the light inlet of the first rotatable sleeve 2-1-2, and the light-emitting window of the first rotatable sleeve 2-1-2 is disposed with the first convex lens 2-1-3 and the first grating 2-1-4 from the inside to the outside.
Laser beam emitting device 2 adopts red light semiconductor laser to make light source, and on the one hand, 3 pairs of these wavelength light of laser light curtain receiving trap have higher responsiveness.In addition on the one hand, ruddiness is visible ray, for reception and the debugging of light curtain in experiment brought convenience.
Embodiment five: present embodiment is described below in conjunction with Fig. 1 to Fig. 6, present embodiment is described further embodiment one, two, three or four, and silicon photo diode photodetector 3-1 comprises silicon photo diode 3-1-1, the second rotatable sleeve 3-1-2, the second convex lens 3-1-3 and the second grating 3-1-4; The light inlet of the second rotatable sleeve 3-1-2 is provided with silicon photo diode 3-1-1, and the light-emitting window of the second rotatable sleeve 3-1-2 sets gradually the second convex lens 3-1-3 and the second grating 3-1-4 from the inside to the outside; Silicon photo diode 3-1-1 is arranged on the focal position of the second convex lens 3-1-3.
Because the photosurface of laser light curtain receiving trap 3 is less than light curtain height, for the light flux variations of any position of light curtain can be detected, so before laser light curtain receiving trap 3, need to converge light curtain, therefore, utilize lens to converge whole light curtain, and focus on the photosurface of laser light curtain receiving trap 3.It is 25.4mm that the second convex lens 3-1-3 selects diameter, the plano-convex lens that focal length is 38.1mm.
Principle of work: when light-gas gun transmitting bullet tests the speed, the laser light curtain receiving trap 3 that is arranged on the light-gas gun section of testing the speed receives the light signal of laser beam emitting device 2 transmittings, and this light signal is changed into current signal input laser velocimeter 1, the current signal of 1 pair of input of laser velocimeter carries out I/V conversion and voltage signal is amplified, then the voltage signal amplifying is inputted in tachometer signal display device 4 to the pellet injection speed that obtains of demonstration.
Wherein, n red light semiconductor laser 2-1 and n silicon photo diode photodetector 3-1 form n road path parallel laser light curtain.During projectile flight, pass through successively the n road parallel laser light curtain being arranged on trajectory, the light signal that laser light curtain receiving trap 3 receives changes, therefore the electric signal that laser light curtain receiving trap 3 produces also changes, through the amplification of 1 pair of signal of laser velocimeter, in tachometer signal display device 4, can show corresponding waveform (crest).When bullet passes through n road parallel optical screen successively, tachometer signal display device 4 can show n waveform, by n crest mistiming, can show that bullet passes the mistiming Δ t of four light curtains, if the distance L S between known light curtain, can calculate speed v=LS/ Δ t of bullet.
When bullet passes through light curtain, block the light curtain of bullet size, laser light curtain receiving trap 3 receives light signal and changes, and by opto-electronic conversion, small variation occurs electric signal, then electric signal is carried out to amplification filtering processing.Whole knotmeter 1 is divided into two parts, is respectively tachometer signal I/V change-over circuit 7 and signal amplification circuit 8.Tachometer signal I/V change-over circuit 7 mainly provides two kinds of optional photoelectric conversion modes, and the biasing resistor situation of connecting and transimpedance amplifier form, carry out opto-electronic conversion.Signal amplification circuit 8 is that the small-signal that tachometer signal sensing part is sent here amplifies processing, then delivers to tachometer signal display device 4 and carries out interpretation demonstration.
Claims (5)
1. for measuring the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot, it is characterized in that, it comprises laser velocimeter (1), laser beam emitting device (2), laser light curtain receiving trap (3), tachometer signal display device (4) and the passage that tests the speed (6)
The endpiece of light-gas gun projectile transmitting device (5) connects the passage (6) that tests the speed, test the speed on passage (6) opposite face laser beam emitting device (2) and laser light curtain receiving trap (3) are set, the tachometer signal output terminal of laser light curtain receiving trap (3) connects the tachometer signal input end of laser velocimeter (1), and the display output terminal of laser velocimeter (1) is connected with the display input end of tachometer signal display device (4).
2. according to claim 1 for measuring the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot, it is characterized in that, laser beam emitting device (2) comprises n red light semiconductor laser (2-1), laser light curtain receiving trap (3) comprises n silicon photo diode photodetector (3-1), n red light semiconductor laser (2-1) and n silicon photo diode photodetector (3-1) form the transmitting of n group light curtain and receive structure, the light curtain of n group light curtain transmitting reception structure is parallel, every group of light curtain transmitting receives structure and comprises 1 red light semiconductor laser (2-1) and 1 silicon photo diode photodetector (3-1), the light curtain that this group light curtain transmitting receives red light semiconductor laser (2-1) transmitting in structure is received by the silicon photo diode photodetector (3-1) in this group, n is natural number, and n=3-10.
3. according to claim 1 for measuring the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot, it is characterized in that, laser velocimeter (1) comprises tachometer signal I/V change-over circuit (7) and signal amplification circuit (8), the tachometer signal input end of tachometer signal I/V change-over circuit (7) connects the tachometer signal output terminal of laser light curtain receiving trap (3), the voltage signal output end of tachometer signal I/V change-over circuit (7) connects the voltage signal input end of signal amplification circuit (8), the output terminal of signal amplification circuit (8) connects the display input end of tachometer signal display device (4).
4. according to claim 1 for measuring the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot, it is characterized in that, red light semiconductor laser (2-1) comprises laser instrument (2-1-1), the first rotatable sleeve (2-1-2), the first convex lens (2-1-3) and the first grating (2-1-4); The light-emitting window of laser instrument (2-1-1) connects the light inlet of the first rotatable sleeve (2-1-2), and the light-emitting window of the first rotatable sleeve (2-1-2) is disposed with the first convex lens (2-1-3) and the first grating (2-1-4) from the inside to the outside.
5. according to claim 1 for measuring the laser light curtain shading type velocity-measuring system of light-gas gun grade velocity of shot, it is characterized in that, silicon photo diode photodetector (3-1) comprises silicon photo diode (3-1-1), the second rotatable sleeve (3-1-2), the second convex lens (3-1-3) and the second grating (3-1-4); The light inlet of the second rotatable sleeve (3-1-2) is provided with silicon photo diode (3-1-1), and the light-emitting window of the second rotatable sleeve (3-1-2) sets gradually the second convex lens (3-1-3) and the second grating (3-1-4) from the inside to the outside; Silicon photo diode (3-1-1) is arranged on the focal position of the second convex lens (3-1-3).
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Cited By (11)
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| CN104020312A (en) * | 2014-06-05 | 2014-09-03 | 湘潭大学 | Laser screen target tachymeter and ballistic trajectory capturing method |
| CN105258902A (en) * | 2015-11-12 | 2016-01-20 | 哈尔滨工业大学 | Device for blocking high speed air flow in target cabin of two-stage light gas gun |
| CN107817361A (en) * | 2017-12-01 | 2018-03-20 | 西安工业大学 | A kind of interfering type shell speed measuring device and its speed-measuring method |
| CN107830772A (en) * | 2017-12-01 | 2018-03-23 | 西安工业大学 | One kind plus wind resistance formula shell speed measuring device and its application method |
| CN107870250A (en) * | 2017-10-30 | 2018-04-03 | 西安工业大学 | A kind of device and its speed-measuring method of laser measurement high-speed motion shell |
| CN108254587A (en) * | 2016-12-29 | 2018-07-06 | 北京京东尚科信息技术有限公司 | Logistics system and halved belt sorter toroid operating speed detection apparatus |
| CN109488500A (en) * | 2018-12-06 | 2019-03-19 | 济南大学 | A kind of wheel abrator pellet jet velocity test method and device based on photoelectric tube |
| CN109580977A (en) * | 2018-11-29 | 2019-04-05 | 天津航天瑞莱科技有限公司 | Air bubble bullet muzzle velocity test macro |
| CN110926282A (en) * | 2019-12-13 | 2020-03-27 | 贵州航天计量测试技术研究所 | Device and method for testing initial velocity of projectile in electromagnetic gun bore |
| CN111505336A (en) * | 2020-04-29 | 2020-08-07 | 中国空气动力研究与发展中心超高速空气动力研究所 | 10 nm-level particle detection device and method applied to ballistic target test |
| CN113567702A (en) * | 2021-08-24 | 2021-10-29 | 化学与精细化工广东省实验室潮州分中心 | Magneto-optical speed measuring system for measuring bullet speed and magneto-optical speed measuring method thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020312A (en) * | 2014-06-05 | 2014-09-03 | 湘潭大学 | Laser screen target tachymeter and ballistic trajectory capturing method |
| CN105258902A (en) * | 2015-11-12 | 2016-01-20 | 哈尔滨工业大学 | Device for blocking high speed air flow in target cabin of two-stage light gas gun |
| CN105258902B (en) * | 2015-11-12 | 2018-04-24 | 哈尔滨工业大学 | High-speed flow retention device in two-stage light gas gun target cabin |
| CN108254587A (en) * | 2016-12-29 | 2018-07-06 | 北京京东尚科信息技术有限公司 | Logistics system and halved belt sorter toroid operating speed detection apparatus |
| CN107870250B (en) * | 2017-10-30 | 2023-06-23 | 西安工业大学 | Device for measuring high-speed moving shell by laser and speed measuring method thereof |
| CN107870250A (en) * | 2017-10-30 | 2018-04-03 | 西安工业大学 | A kind of device and its speed-measuring method of laser measurement high-speed motion shell |
| CN107830772A (en) * | 2017-12-01 | 2018-03-23 | 西安工业大学 | One kind plus wind resistance formula shell speed measuring device and its application method |
| CN107817361B (en) * | 2017-12-01 | 2023-06-23 | 西安工业大学 | Interference type shell speed measuring device and speed measuring method thereof |
| CN107817361A (en) * | 2017-12-01 | 2018-03-20 | 西安工业大学 | A kind of interfering type shell speed measuring device and its speed-measuring method |
| CN109580977A (en) * | 2018-11-29 | 2019-04-05 | 天津航天瑞莱科技有限公司 | Air bubble bullet muzzle velocity test macro |
| CN109488500A (en) * | 2018-12-06 | 2019-03-19 | 济南大学 | A kind of wheel abrator pellet jet velocity test method and device based on photoelectric tube |
| CN110926282A (en) * | 2019-12-13 | 2020-03-27 | 贵州航天计量测试技术研究所 | Device and method for testing initial velocity of projectile in electromagnetic gun bore |
| CN110926282B (en) * | 2019-12-13 | 2022-04-19 | 贵州航天计量测试技术研究所 | Device and method for testing initial velocity of projectile in electromagnetic gun bore |
| CN111505336A (en) * | 2020-04-29 | 2020-08-07 | 中国空气动力研究与发展中心超高速空气动力研究所 | 10 nm-level particle detection device and method applied to ballistic target test |
| CN113567702A (en) * | 2021-08-24 | 2021-10-29 | 化学与精细化工广东省实验室潮州分中心 | Magneto-optical speed measuring system for measuring bullet speed and magneto-optical speed measuring method thereof |
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Application publication date: 20140219 |