CN102507064B - Detection device of pressure distribution of laser impact waves - Google Patents
Detection device of pressure distribution of laser impact waves Download PDFInfo
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- CN102507064B CN102507064B CN201110381076XA CN201110381076A CN102507064B CN 102507064 B CN102507064 B CN 102507064B CN 201110381076X A CN201110381076X A CN 201110381076XA CN 201110381076 A CN201110381076 A CN 201110381076A CN 102507064 B CN102507064 B CN 102507064B
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Abstract
The invention relates to the field of laser processing, in particular to a detection device of pressure distribution of laser impact waves. The detection device of the pressure distribution of the laser impact waves is mainly suitable for pressure distribution of laser impact waves under specific parameters and is used for optimizing laser impact intensification technology. According to the detection device of the pressure distribution of the laser impact waves, disclosed by the invention, an IPC (Industrial Personal Computer) controls a power source of a laser device to enable the laser device to generate pulse lasers according to preset parameters; through a water film, laser beams are radiated on a surface of a test piece, on which an absorbing layer is coated; the material of the absorbing layer is gasified and ionized to generate impact waves; after subjected to the pressure function of the impact waves, the test piece starts moving; a speed measuring system measures an initial velocity and acquires data to the IPC; and the pressure of the impact waves is displayed through program processing. The detection device of the pressure distribution of the laser impact waves, disclosed by the invention, utilizes the momentum theorem. The measuring principle and used measuring device are simple; under the precondition that the energy of the laser device is steady, the detection device of the pressure distribution of the laser impact waves, disclosed by the invention, is steady in a measuring process, high in repeatability and easy to realize.
Description
Technical field
The present invention relates to field of laser processing, refer in particular to a kind of pick-up unit of laser blast wave pressure distribution, mainly be applicable to the laser blast wave pressure distribution under special parameter, optimize laser impact intensified technique.
background of invention
Along with the development of the technology such as green energy resource, Aero-Space, oceanographic engineering, laser impact intensified having obtained studied widely and applies.Because laser pulse width is very narrow, action time short (femtosecond, picosecond), the shock wave of its generation is also very short effective acting time, thereby adopts the restraint layer technology in shock peening.With the Ear Mucosa Treated by He Ne Laser Irradiation metal surface absorption layer of short pulse peak value, instantaneous steam raising, ionization occur after absorption layer absorbing laser energy, produce the plasma gas of High Temperature High Pressure.Due to the restriction of the layer that suffers restraints, plasma is known from experience the generation high-pressure shocking wave and is acted on substrate surface, makes it instantaneous surrender, and produces strain hardening.
Patent has been declared by AM General company in 2007: Laser Shock peening System With Tiome-of-flight Monitoring: Patent Number:US20070119824A1 (the laser impact intensified system of flight time monitoring), and 2009, the patent that Jiangsu University declares: laser impact intensified online test method and device based on the laser blast wave waveform character.Above-mentioned two kinds of methods rely on environment, when ambient humidity and temperature change, can affect wave propagation, and then affect measurement result.
Immediate with the present invention is assay method and the device of related parameter of underwater laser shock formation.The determinator of laser impact forming water film thickness shock wave parameter influence, comprise laser generator, laser generator control system, water film thickness regulating system, pressure detecting system, restraint layer and absorption layer material.Control laser generator by control system and press preset parameter generation laser pulse, laser beam shines on the absorption layer be coated on the sensor protection film by restraint layer, the vaporization of absorption layer material, ionization produces shock wave, be delivered to sensor surface through diaphragm, the sensor generation electric signal that deforms under pressure, pick-up unit detects this signal through amplifying, demonstrate the pressure curve of shock wave after the value conversion on oscillograph, said method, after Laser shock loading, absorption layer can not all gasify and come off, also can damage the sensor reason if energy is excessive, confidence level on test result has produced impact.
The laser facula energy distribution is inhomogeneous, on laser impact intensified, significant impact is arranged, but also about shock wave pressure in the laser emission hot spot, does not distribute and detect relevant research report and patent of invention at present.
Summary of the invention
The object of the invention is to detect the distribution of shock wave pressure, Yi Shui, water-transparent membrane and glass-water are restraint layer respectively, and a kind of method and apparatus that processing environment strong adaptability, reliable and stable, lower-cost detection shock wave pressure are distributed is provided.
A kind of pick-up unit of laser blast wave pressure distribution, comprise the laser instrument, laser power supply and the industrial computer that are positioned on the laser works platform, it is characterized in that: described device also is provided with laser beam multiplying arrangement, light splitting equipment, water film thickness regulating system and velocity-measuring system; The laser beam multiplying arrangement is for laser beam is amplified, and light-dividing device is for the laser beam piecemeal by amplifying, and velocity-measuring system is for detection of shock wave pressure, and industrial computer is for controlling laser power supply, workstation control system and velocity-measuring system.
Described laser beam multiplying arrangement is comprised of dovetail slide rail, large lens and lenslet, the dovetail slide rail is fixed on an end of the close laser instrument light-emitting window of laser instrument installment work platform, lenslet is arranged on the end near laser instrument on the dovetail slide rail and also can moves in the dovetail slide rail, large lens are installed the end away from laser instrument on the dovetail slide rail and also can be moved in the dovetail slide rail, by regulating the distance between lenslet and large lens, and then the size of regulating light beam.
Described velocity-measuring system is by test specimen, speed measuring device, electromagnet, electromagnet limit switch and worktable form, this system is for the speed of test specimen after the measuring shock waves effect, because the pulsewidth of laser is known, the quality of test specimen and speed can be measured, by theorem of momentum: the initial velocity that the quality of test specimen is multiplied by test specimen is again divided by the laser pulse width of 3 times, just can calculate shock wave pressure, test specimen is placed in the groove of worktable, scribbling one of absorption layer rectifies the light splitting herringbone wheel in the light splitting equipment, speed measuring device is fixed on worktable, be positioned at the end that test specimen is not coated with restraint layer, speed for test specimen after the measuring shock waves effect, electromagnet is fixed on the end away from laser instrument of worktable, the electromagnet limit switch is arranged in the groove of worktable, between test specimen and electromagnet and near electromagnet, after shock wave, test specimen obtains certain speed and moves in the groove of worktable, while touching the electromagnet limit switch, the electromagnet energising is for adsorbing test specimen, prevent from rebounding after test specimen from clashing into.
Described light splitting equipment is by beam splitting system, 2 herringbone wheels, servomotor, the horizontal direction guide rail, the vertical direction guide rail, gear case and Electric Appliance Cabinet form, beam splitting system is become with 2 herringbone gear sets by the light splitting herringbone wheel, the light splitting herringbone wheel is positioned in the middle of 2 herringbone wheels and intermeshing fixing, be provided with fan-shaped pylone in the middle of the light splitting gear, be provided with the slide block of regulating through hole printing opacity position on fan-shaped pylone, beam splitting system is arranged in gear case, the shaft coupling that the left side herringbone wheel of beam splitting system is interior by gear case and gear are by the first driven by servomotor, the first servomotor and gear case are fixed on the horizontal direction guide rail and can move by the along continuous straight runs guide rail, horizontal direction guide rails assembling on the vertical direction guide rail and vertically guide rail moves, the right side herringbone wheel is fixed on gear case by gear shaft and bearing, by the accurate anglec of rotation of servomotor, fan-shaped pylone can be rotated along the light splitting herringbone wheel center of circle, therefore light splitting accurately, Electric Appliance Cabinet moves in guide rail in the horizontal direction by the second servomotor driven gear case on the level of control traversing guide and the first servomotor, move in the vertical direction guide rail by the 3rd servomotor drive horizontal direction guide rail of controlling on the vertical direction guide rail, realize the two dimensional surface motion of worktable.
Described water film thickness regulating system is comprised of with water pipe and tank draining tap, osculum, the draining tap is arranged on an end of the close light splitting equipment of worktable, osculum and water pipe are fixed on worktable, be positioned at draining tap below, water for the exhaust emission constraint layer, tank be positioned at osculum and water pipe under, for storing the water of osculum and water pipe discharge, water film thickness is controlled by the draining tap, the end face that water scribbles absorption layer from the outflow of draining tap at test specimen forms moisture film, and enters tank by osculum and water pipe.
Described speed measuring device is speed pickup.
The alloy that described sample is iron, cobalt or nickel.
Described industrial computer is for controlling speed measuring device and the regulator cubicle of laser power supply, velocity-measuring system.
Control laser power supply by industrial computer, make laser instrument produce pulse laser by preset parameter, laser beam is radiated on the test specimen surface that scribbles absorption layer by moisture film, the gasification of absorption layer material, ionization produce shock wave, test specimen setting in motion after the shock wave pressure effect, velocity-measuring system is measured starting velocity, and data acquisition is arrived to industrial computer, by routine processes, demonstrates shock wave pressure.
Implementation process of the present invention is as follows:
1, the end face at smooth cylinder specimen is coated with the absorption layer material;
2, test specimen is arranged on worktable;
3, open Laser Power Devices, industrial computer, speed measuring device, Electric Appliance Cabinet, beat in the industrial computer operating system platform
Open process software, and detect the communication conditions of industrial computer and Laser Power Devices, industrial computer and speed measuring device and industrial computer and Electric Appliance Cabinet, determine that communication conditions is good;
4, control laser power supply by industrial computer, make laser instrument energy and the interior hot spot of certain limit on request
Diameter, send laser pulse, and the laser beam scioptics amplify lasing beam diameter;
5, the laser beam that diameter amplifies is by light-dividing device, and wherein a tuftlet laser penetrates from light-dividing device;
6, the laser beam restraint layer is radiated on absorption layer, and the gasification of absorption layer material, ionization produce shock wave, punching
Test specimen setting in motion after the pressure of hammer wave effect, velocity-measuring system is measured starting velocity, and data acquisition is arrived to industrial computer;
7, shock wave pressure is processed and demonstrated to messaging software according to the data that collect;
8, regulate the slide block of light-dividing device light splitting herringbone gear through hole printing opacity position, make light hole change a position,
And repeating step 4-7 draws the shock wave pressure of the 2nd position, again repeat, until the laser-impact wave pressure of scallop hole position is measured.
9, the light splitting herringbone wheel turns an angle, and repeating step 4-8 is until by the impact of all positions of laser beam
Wave pressure is measured, and can draw the laser blast wave pressure distribution.
Advantage of the present invention:
1, usining during liquid detects as the laser-impact of restraint layer, the thickness of moisture film is wayward, this device employing standard series, the fixing tap cover of liquid exit thickness, and then accurately control water film thickness, the impact of shock wave parameter, and then Optimization Technology;
2, adopt lens that laser beam is amplified, and the laser piecemeal after amplifying, and then can determine accurately the distribution of laser-impact wave pressure, significant for the optimization of impact process;
3, utilize theorem of momentum.The measurement mechanism of measuring principle and use is simple, and in energy of lasers, under stable prerequisite, measuring process is stable, repeatable high, is easy to realize.
The accompanying drawing explanation
Apparatus of the present invention structure accompanying drawing is described as follows:
Fig. 1 is laser blast wave pressure distribution detection device schematic diagram;
Fig. 2 is water film thickness regulating system structural representation;
Fig. 3 is laser beam light-dividing device structural representation;
Fig. 4 is light splitting herringbone wheel structural representation;
1, laser instrument; 2, laser power supply; 3, dovetail slide rail; 4, lenslet; 5, large lens; 6, vertical direction guide rail; 7, the 3rd servomotor; 8, light splitting herringbone wheel; 9, osculum and water pipe; 10, test specimen; 11, draining tap; 12, speed measuring device; 13, worktable; 14, electromagnet limit switch; 15, electromagnet; 16, the second servomotor; 17, horizontal direction guide rail; 18, Electric Appliance Cabinet; 19, tank; 20, herringbone wheel; 21, herringbone wheel; 22, the first servomotor; 23, shaft coupling; 24, slide block; 25, industrial computer; 26, laser instrument installment work platform; 27, bearing; 28, gear case; 29, gear shaft.
Embodiment
Following examples are used for the present invention is described, but are not for limiting the present invention.
A kind of pick-up unit of laser blast wave pressure distribution comprises laser instrument 1, laser power supply 2, industrial computer 25, it is characterized in that: described device also is provided with laser beam multiplying arrangement, light splitting equipment, water film thickness regulating system and velocity-measuring system, the laser beam multiplying arrangement is for amplifying laser beam, light-dividing device is for the laser beam piecemeal by amplifying, and velocity-measuring system is for detection of laser-impact pressure.
The laser beam multiplying arrangement is comprised of dovetail slide rail 3, large lens 5 and lenslet 4; Dovetail slide rail 3 is fixed on an end of close laser instrument 1 light-emitting window of laser instrument installment work platform 26; Lenslet 4 is installed on dovetail slide rail 3 and close laser instrument 1 part, and can be in the interior movement of dovetail slide rail 3; Large lens 5 are installed on dovetail slide rails 3 away from laser instrument 1 part, and can be in the interior movement of dovetail slide rail 3; By regulating the distance of 5, lenslet 4 and large lens, regulate light beam to applicable size.
The light splitting equipment is by light splitting herringbone wheel 8, herringbone wheel 20, herringbone wheel 21, the first servomotor 22, horizontal direction guide rail 17, vertical direction guide rail 6, gear case 28 and Electric Appliance Cabinet 18 form, light splitting herringbone wheel 8 is by the herringbone wheel 20 on the same straight line, herringbone wheel 21 engagements are fixing, be positioned at the centre of light-dividing device, its both sides are herringbone wheel 20 and herringbone wheel 21, left side herringbone wheel 21 is driven by the first servomotor 22 by the shaft coupling 23 in gear case 28 and gear shaft 29, the right side herringbone wheel is fixed on gear case 28 by gear shaft 29 and bearing 27, the first servomotor 22 and gear case 28 are arranged on horizontal direction guide rail 17, a fan-shaped pylone is arranged in the middle of light splitting herringbone wheel 8, the fan-shaped pylone of this light splitting herringbone wheel 8 wound have regulate through hole printing opacity position slide block 24, the first servomotor 22 and gear case 28 are arranged on horizontal direction guide rail 17 and can move by along continuous straight runs guide rail 17, horizontal direction guide rail 17 be arranged on vertical direction guide rail 6 and vertically guide rail 6 move, Electric Appliance Cabinet 18 drives the first servomotor 22 and the gear case 28 interior movement of guide rail 17 in the horizontal direction by controlling the second servomotor 16, drive horizontal direction guide rail 17 in the interior movement of vertical direction guide rail 16 by controlling the 3rd servomotor 7, realize the two dimensional surface motion of worktable.
The light splitting equipment is one of key of this device, on the light splitting herringbone wheel 8 of bombardment with laser beams in light-dividing device that diameter amplifies, because the light splitting herringbone wheel only has a scallop hole and the slide block 24 for the adjustment hole size has been installed on hole, therefore only have the tuftlet laser in laser beam to penetrate from light-dividing device, laser pulse of every output, the first servomotor 22 rotates herringbone wheel 21 by shaft coupling 23 driven gear axles 29, because herringbone wheel 21 is fixing with 8 engagements of light splitting herringbone wheel, thereby drive the position that 8 rotations of light splitting herringbone wheel obtain different fan-shaped pylones, also can regulate the slide block 24 of light splitting herringbone gear 8 through hole printing opacity positions, change the printing opacity position of fan-shaped pylone, also can obtain different impact positions, and obtain the shock wave pressure of each reposition, until the laser-impact wave pressure of scallop hole position is measured, after the laser-impact wave pressure of this position is measured, industrial computer 25 turns an angle by motion control card control the first servomotor 22 that is arranged on 18 li of industrial computer and Electric Appliance Cabinets, make the scallop hole of light splitting herringbone wheel 8 turn an angle thereupon and arrive new position, repeat previous way, until the shock wave pressure of all positions of laser beam is measured, can draw the laser blast wave pressure distribution.
The water film thickness regulating system is comprised of with water pipe 9 and tank 19 draining tap 11, osculum, draining tap 11 is arranged on an end of the close laser instrument 1 of worktable 13, on osculum and water pipe 9 stationary work-tables 13, be positioned at draining tap 11 belows, water for the exhaust emission constraint layer, tank 19 be positioned at osculum and water pipe 9 under, for storing the water of osculum and water pipe 9 discharges, water film thickness is controlled by draining tap 11, the end face that water scribbles absorption layer from 11 outflows of draining tap at test specimen 10 forms moisture film, then by osculum and water pipe 9, enters tank 19.
Velocity-measuring system is by test specimen 10, speed measuring device 12, electromagnet 15, electromagnet limit switch 14 and worktable 13 form, this system is for the speed of test specimen after the measuring shock waves effect, because the pulsewidth of laser is known, the quality of test specimen and speed can be measured, by theorem of momentum: the initial velocity that the quality of test specimen 10 is multiplied by test specimen is again divided by the laser pulse width of 3 times, just can calculate shock wave pressure, test specimen 10 is placed in the groove of worktable 13, scribbling one of absorption layer rectifies laser instrument 1, speed measuring device 12 is fixed on worktable 13, be positioned at the end that test specimen 10 is not coated with restraint layer, speed for test specimen after the measuring shock waves effect, electromagnet 15 is fixed on the end away from laser instrument 1 of worktable 13, electromagnet limit switch 14 is arranged in the groove of worktable 13, between test specimen 10 and electromagnet 15 and near electromagnet 15, after shock wave, the certain speed of test specimen 10 acquisition is moved in the groove of worktable 13, while touching electromagnet limit switch 14, electromagnet 15 energisings, certain absorption affinity is arranged, for adsorbing test specimen 10, prevent from rebounding after test specimen 10 from clashing into.
Specific operation process:
Open Laser Power Devices 2, industrial computer 25, speed measuring device 12, and detection industrial computer 25 and Laser Power Devices 2, industrial computer 25 and speed measuring device 12 communication conditions, determine that communication conditions is good, the smooth specimen 10 that end face is coated with to absorption layer is arranged on worktable 13, control laser power supply 2 by industrial computer 25, make laser instrument 1 energy and the interior spot diameter of certain limit on request, send pulse laser beam, laser beam is by large lens 5, lenslet 4 amplifies laser beam, the laser beam that diameter amplifies is by light splitting herringbone wheel 8, wherein a tuftlet laser is taken turns ejaculation from light splitting herringbone tooth 8, by moisture film, be radiated on absorption layer, the gasification of absorption layer material, ionization produces shock wave, test specimen 10 setting in motions after shock wave, speed measuring device 12 is measured starting velocity, and data acquisition is arrived to industrial computer 25, demonstrate shock wave pressure by routine processes, regulate the slide block 24 of light splitting herringbone gear 8 through hole printing opacity positions, light hole is changed to a position, and obtain the shock wave pressure of each reposition, until the laser-impact wave pressure of scallop hole position is measured, after the laser-impact wave pressure of this position is measured, industrial computer 25 turns an angle by the motion control card control servomotor 22 that is arranged on 18 li of industrial computer and Electric Appliance Cabinets, make the scallop hole of light splitting herringbone wheel 8 turn an angle thereupon and arrive new position, repeat previous way, until the shock wave pressure of all positions of laser beam is measured, can draw the laser blast wave pressure distribution.
Embodiment
Adopt Basic principles and devices of the present invention to carry out single-point to the 7075-T651 aluminium alloy, the initial velocity of sample while measuring respectively the energy at laser spot center, spot radius middle part, hot spot edge, calculate the shock wave pressure of laser blast wave in each position, as shown in table 1; Concrete experiment condition is: the gross mass of sample (sample and aluminium foil) is 40 grams, Gaia-R series high energy pulse lamp LD pumped YAG lasers, pulsed laser energy is respectively 10J, 11 J, 12 J, impact spot diameter 3mm, optical maser wavelength 1064nm, pulsewidth 10ns, calculate corresponding laser power density according to laser energy and the relation of power density and be respectively 14 * 10
9w/cm
2, 16 * 10
9w/cm
2, 17 * 10
9w/cm
2,, as the laser energy absorption layer, water is as restraint layer for Minnesota Mining and Manufacturing Company's aluminum foil special of employing 0.1mm during laser-impact (wherein one side is alite paste, pastes with specimen surface).
Table 1
Claims (4)
1. the pick-up unit of a laser blast wave pressure distribution, comprise the laser instrument, laser power supply and the industrial computer that are positioned on the laser works platform, it is characterized in that: described device also is provided with laser beam multiplying arrangement, light splitting equipment, water film thickness regulating system and velocity-measuring system, described laser beam multiplying arrangement is comprised of dovetail slide rail, large lens and lenslet, the dovetail slide rail is fixed on an end of the close laser instrument light-emitting window of laser instrument installment work platform, lenslet is arranged on the end near laser instrument on the dovetail slide rail and also can moves in the dovetail slide rail, large lens are installed the end away from laser instrument on the dovetail slide rail and also can be moved in the dovetail slide rail, by regulating the distance between lenslet and large lens, and then the size of regulating light beam, described velocity-measuring system is by test specimen, speed measuring device, electromagnet, electromagnet limit switch and worktable form, test specimen is placed in the groove of worktable, scribbling one of absorption layer rectifies the light splitting herringbone wheel in the light splitting equipment, speed measuring device is fixed on worktable, be positioned at the end that test specimen is not coated with restraint layer, speed for test specimen after the measuring shock waves effect, electromagnet is fixed on the end away from laser instrument of worktable, the electromagnet limit switch is arranged in the groove of worktable, between test specimen and electromagnet and near electromagnet, after shock wave, test specimen obtains certain speed and moves in the groove of worktable, while touching the electromagnet limit switch, the electromagnet energising is for adsorbing test specimen, prevent from rebounding after test specimen from clashing into, described light splitting equipment is by beam splitting system, 2 herringbone wheels, servomotor, the horizontal direction guide rail, the vertical direction guide rail, gear case and Electric Appliance Cabinet form, beam splitting system is become with 2 herringbone gear sets by the light splitting herringbone wheel, the light splitting herringbone wheel is positioned in the middle of 2 herringbone wheels and intermeshing fixing, be provided with fan-shaped pylone in the middle of the light splitting gear, be provided with the slide block of regulating through hole printing opacity position on fan-shaped pylone, beam splitting system is arranged in gear case, the shaft coupling that the left side herringbone wheel of beam splitting system is interior by gear case and gear are by the first driven by servomotor, the first servomotor and gear case are fixed on the horizontal direction guide rail and can move by the along continuous straight runs guide rail, horizontal direction guide rails assembling on the vertical direction guide rail and vertically guide rail moves, the right side herringbone wheel is fixed on gear case by gear shaft and bearing, by the accurate anglec of rotation of servomotor, fan-shaped pylone can be rotated along the light splitting herringbone wheel center of circle, therefore light splitting accurately, Electric Appliance Cabinet moves in guide rail in the horizontal direction by the second servomotor driven gear case on the level of control traversing guide and the first servomotor, by the 3rd servomotor drive horizontal direction guide rail of controlling on the vertical direction guide rail, in the vertical direction guide rail, moves, described water film thickness regulating system is comprised of with water pipe and tank draining tap, osculum, the draining tap is arranged on an end of the close light splitting equipment of worktable, osculum and water pipe are fixed on worktable, be positioned at draining tap below, water for the exhaust emission constraint layer, tank be positioned at osculum and water pipe under, for storing the water of osculum and water pipe discharge, water film thickness is controlled by the draining tap, the end face that water scribbles absorption layer from the outflow of draining tap at test specimen forms moisture film, and enters tank by osculum and water pipe.
2. the pick-up unit of a kind of laser blast wave pressure distribution as claimed in claim 1, it is characterized in that: described speed measuring device is speed pickup.
3. the pick-up unit of a kind of laser blast wave pressure distribution as claimed in claim 1, is characterized in that: the alloy that described test specimen is iron, cobalt or nickel.
4. the pick-up unit of a kind of laser blast wave pressure distribution as claimed in claim 1 is characterized in that: described industrial computer is for controlling speed measuring device and the regulator cubicle of laser power supply, velocity-measuring system.
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| CN103203543B (en) * | 2013-02-04 | 2015-03-11 | 中国航空工业集团公司北京航空制造工程研究所 | Method and device for injecting water restraint layer of laser shock processing blade |
| CN103983390B (en) * | 2014-05-09 | 2015-12-30 | 南京理工大学 | Rotary powder extruding pelletizing forming mechanics parameter measurement mechanism |
| CN104614100A (en) * | 2014-09-28 | 2015-05-13 | 李众利 | Device for measuring diffusion type shock wave energy |
| CN106563970B (en) * | 2016-11-10 | 2018-05-22 | 哈尔滨工业大学 | A kind of detection method of hydrostatic slideway oil pocket pressure distribution |
| CN107421680B (en) * | 2017-07-31 | 2019-06-28 | 江苏大学 | Hydraulic oil impact force measurements devices and methods therefor under laser-impact |
| CN113372863A (en) * | 2021-06-22 | 2021-09-10 | 深圳市汇海鑫科技有限公司 | High-thermal-conductivity and high-electric-conductivity organic adhesive and preparation method thereof |
| CN113739971B (en) * | 2021-08-21 | 2022-09-23 | 北京航空航天大学 | Device and method for measuring laser-induced shock wave pressure |
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| CN100409994C (en) * | 2005-10-14 | 2008-08-13 | 江苏大学 | Method and apparatus for supercharging water constraint layer based on laser impact technology |
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