CN104330316A - Method for producing extremely-narrow acceleration excitation signal based on pulse laser - Google Patents
Method for producing extremely-narrow acceleration excitation signal based on pulse laser Download PDFInfo
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- CN104330316A CN104330316A CN201410586532.8A CN201410586532A CN104330316A CN 104330316 A CN104330316 A CN 104330316A CN 201410586532 A CN201410586532 A CN 201410586532A CN 104330316 A CN104330316 A CN 104330316A
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Abstract
The invention discloses two technical schemes, namely a method for producing an extremely-narrow acceleration excitation signal based on pulse laser and a device for producing extremely-narrow acceleration excitation signal, belonging to the technical field of impact test or experiment. According to the method, the front end of a micro Hopkinson rod is irradiated by high-power pulse laser, so that impact wave which is an extremely-narrow acceleration excitation signal is instantly generated in the micro Hopkinson rod. The device comprises a high-power pulse laser, a micro Hopkinson rod and other auxiliary devices and instruments; the front end of the micro Hopkinson rod is irradiated by the high-power pulse laser, so that the impact wave which is the extremely-narrow acceleration excitation signal is instantly generated in the micro Hopkinson rod. The method has the advantages that a method for obtaining an extremely-narrow acceleration excitation signal by irradiating the micro Hopkinson rod by virtue of high pulse laser is innovatively implemented; the method has a high practical value in dynamic calibration of a high-g-value accelerometer. The device has the advantages that the structure is simple, the test operation process is simple and convenient, and the dynamic calibration of the high-g-value accelerometer in the entire measuring range can be implemented; the method and the device are worthy to apply and popularize.
Description
Technical field
The method producing extremely narrow acceleration pumping signal based on pulse laser disclosed by the invention, belong to shock-testing or experimental technique field, be specifically related to a kind of method adopting pulse laser to produce extremely narrow acceleration pumping signal and the device producing extremely narrow acceleration pumping signal.
Background technology
When a branch of high power pulses (ns magnitude) laser is irradiated to metal material surface, material surface can rapid blasting property of absorbing laser energy be vaporized, ionization simultaneously forms high-temperature, high pressure (being greater than 1GPa), deviates from material and outwards spray dense gas ions, thus bring out a high-pressure shocking wave, and at material surface or an inner applying great pressure.
Along with the development of superpower laser technology, the high power laser light utilizing it to export makes drive source, can produce a very strong shock wave, the pressure that shock wave pressure utilizes other means to obtain under usual laboratory condition in target.Laser-driven shock wave has laser direct driven and laser indirect to drive two kinds of modes.In indirect driving shock wave process, the incident laser energy of superpower laser is absorbed by metal material surface, produce the plasma to vacuum high velocity jet, a reverse Commodity flow can be formed in material in material surface and impact compress is carried out to material, forming the shock wave inwardly propagated.
Hopkinson bar experimental technique is based upon on one dimension elasticity theory of stress wave basis, the propagation of one dimension elastic stress wave will occur after Hopkinson bar is impacted in bar.Free style Hopkinson pole technology has become the effective ways producing high-g level acceleration.
In Hopkinson bar, the total usable spectrum analytical approach of any stress wave is decomposed into the harmonic component of different frequency, due to the transverse inertia effect of particle in bar, speed respectively by oneself is propagated by the harmonic component of different frequency, therefore waveform can not hold its shape and disperse must come in communication process, and namely the geometry diffusing phenomenon of so-called ripple occurs.Due to geometry disperse, in fact the wave front forward position of stress pulse is delayed by abrupt change gradually with the increase of propagation distance, and namely during the rising of stress pulse forward position, ts increases gradually with propagation distance, and bar footpath is larger, and when it rises, change is more remarkable.The experimental formula that can form acceleration pumping signal minimum pulse width in Hopkinson bar is:
In formula, r, l are respectively Hopkinson bar radius and length; C is stress wave velocity of wave.If it is enough narrow to produce excitation pulsewidth, therefore r, l value is little.
The research of penetration and anti-Penetration in weapons science and technology, the research of target plate target property, the penetration of armor-piercing bullet runs through the impact force measurements in process, magnitude of load measurement etc. when car crass, airplane falling, all needs the change procedure measuring its acceleration signal.In modern war, that occurred various high strength, multi-form integrated protection target, as airfield runway, hangar, aircraft carrier and senior commander strategic point etc., in order to attack these high pay-off targets, the earth-drilling bomb body of some " intelligent " occurs in succession, in order to ignite when reaching the maximum damage effectiveness to target at body, require that missile-borne electronic installation had both had the ability identifying different target, the repeatedly HI high impact produced when can resist again the protective layer through various soft or hard is multi-form.Such as, when developing anti-runway Qinzhou harbor, requiring that bullet passes multilayer barrier, arriving the blast of the appropriate degree of depth and can reach best execution.Each dynamic parameter of this bullet that just requires to know for sure, as accekeration, finally to explode time point in order to control earth-drilling bomb.And aforesaid impact is all produce instantaneously, application Hopkinson rod principle, make accelerometer indirectly obtain acceleration signal, these acceleration signals should be all extremely narrow, so simulate extremely narrow acceleration signal will have important actual application value to the test of high impact.
A kind of method producing extremely narrow acceleration pumping signal based on pulse laser disclosed by the invention, front end by YAG high power pulsed laser laser being irradiated to microminiature Hopkinson bar is proposed first, the light laser of this pulsewidth ns magnitude is utilized to produce high-strength impact ripple, make the pulse that in microminiature Hopkinson bar, generation one is extremely narrow, thus give accelerometer pulsewidth extremely narrow acceleration pumping signal.
Summary of the invention
The object of the invention is: provide to society and produce the method for extremely narrow acceleration pumping signal and device two technical schemes of the extremely narrow acceleration pumping signal of generation based on pulse laser.Because these two technical schemes have Practical significance.Two technical schemes of the present invention are:
First technical scheme of the present invention is such: this method producing extremely narrow acceleration pumping signal based on pulse laser, technical characterstic is: the method for the extremely narrow acceleration pumping signal of described generation is: adopt high power pulsed laser to irradiate microminiature Hopkinson bar front end, make to produce the namely extremely narrow acceleration pumping signal of shock wave in microminiature Hopkinson bar instantaneously.The experimental formula that can form acceleration wave minimum pulse width in described microminiature Hopkinson bar is:
In formula, r, l are respectively Hopkinson bar radius and length; C is stress wave velocity of wave.If it is enough narrow to produce excitation pulsewidth, therefore r, l value is little.Extremely narrow acceleration pumping signal to be produced in this method, therefore microminiature Hopkinson bar will be adopted in this method.
According to the above-described method producing extremely narrow acceleration pumping signal based on pulse laser, technical characterstic also has: described high power pulsed laser is the laser sent by YAG high power pulsed laser, and this laser spot diameter size is 4mm ~ 6mm, pulsewidth is 1ns ~ 60ns, energy is 70MJ ~ 1200MJ (megajoule).Described YAG is yttrium aluminum garnet.
According to the above-described method producing extremely narrow acceleration pumping signal based on pulse laser, technical characterstic also has: the structure of described microminiature Hopkinson bar is: waveform adjustment pad is attached to the front end of bar by common adhesive, the coplanar laser illumination of waveform adjustment pad sticks aluminium foil absorption layer by common adhesive equally, again optical glass sheet clear binder is attached on aluminium foil absorption layer, the rear end of microminiature Hopkinson bar is arranged on mount pad front end by vacuum tight adhesive, accelerometer with high g values is arranged on the rear end of mount pad by helicitic texture, in the narrow acceleration pumping signal of this accelerometer output terminal output stage.Described common adhesive includes: butter, vaseline.Described clear binder is 502 cementing agents.Described waveform adjustment pad includes 2A12 aluminium, Q235 steel with Hopkinson bar same diameter, material, and thickness is the pad of 3mm.Said mount pad is one and has the right cylinder of same diameter with microminiature Hopkinson bar, and rear end has vertically for installing ring shaped thread in accelerometer with high g values.Described microminiature Hopkinson rear end is arranged on mount pad front end by vacuum tight adhesive, the structure of its vacuum tight adhesive is a hollow circular cylinder, O-ring seals is provided with for vacuumizing sealing near two ends place in hollow circular cylinder, microminiature Hopkinson rod rear end, mount pad front end is inserted respectively in hollow circular cylinder two ends, hollow circuit cylinder dignity there is linked hole in one and hollow circular cylinder, for vacuumizing.
According to the above-described method producing extremely narrow acceleration pumping signal based on pulse laser, technical characterstic also has: described microminiature Hopkinson bar detailed construction has: microminiature Hopkinson shank diameter is chosen as 5mm or 8mm or 10mm, and length is chosen as 20mm ~ 300mm.
According to the above-described method producing extremely narrow acceleration pumping signal based on pulse laser, technical characterstic also has: the extremely narrow acceleration pumping signal produced described in a., its pulsewidth is less than 6us.B. adjusting shaft orientation laser interferometer makes the extremely narrow acceleration pumping signal of measurement normal.C. computer recording and process are by the signal of the accelerometer with high g values of wave tracer record, and shaft orientation laser interferometer measurement, by the extremely narrow acceleration pumping signal exported from microminiature Hopkinson rod rear end of wave tracer record.Described adjustment shaft orientation laser interferometer is the lens focus of regulating shaft to laser interferometer, makes indicator signal reach full lattice.Described accelerometer with high g values is piezoelectric type, pressure resistance type velograph, and its range index is greater than 100000g.
Second technical scheme of the present invention is as follows: the device of the extremely narrow acceleration pumping signal of this generation, technical characterstic is: the device of the extremely narrow acceleration pumping signal of described generation includes high power pulsed laser, microminiature Hopkinson bar, adopt high power arteries and veins light device to irradiate microminiature Hopkinson bar front end, make in microminiature Hopkinson bar, to produce shock wave i.e. extremely narrow acceleration pumping signal instantaneously.Produce extremely narrow acceleration pumping signal, this device is selected to adopt microminiature Hopkinson bar.
According to the device of the extremely narrow acceleration pumping signal of above-described generation, technical characterstic also has: the device of the extremely narrow acceleration pumping signal of described generation specifically assembles, debugging step is: a. regulates spot diameter and the intensity size of YAG high power pulsed laser Output of laser, makes parameter meet this matching requirements standard.Described YAG is yttrium aluminum garnet.B. select to adopt aluminium foil to do restraint layer as energy-absorbing layer and glass to be attached on the coplanar laser illumination of waveform adjustment pad of protection microminiature Hopkinson bar by common adhesive and clear binder successively.Described common adhesive includes: butter, vaseline.Described clear binder 502 cementing agent.Described waveform adjustment pad includes 2A12 aluminium, Q235 steel with Hopkinson bar same diameter, material, and thickness is the pad of 3mm.C. the front end face of mount pad is closely pull-in on microminiature Hopkinson bar end by vacuum fixture, and accelerometer with high g values is arranged on the rear end of mount pad by helicitic texture, in the narrow acceleration pumping signal of this accelerometer output terminal output stage.Said mount pad is one and has the right cylinder of same diameter with microminiature Hopkinson bar, and rear end has vertically for installing ring shaped thread in accelerometer with high g values.Described microminiature Hopkinson rear end is arranged on mount pad front end by vacuum tight adhesive, the structure of its vacuum tight adhesive is a hollow circular cylinder, O-ring seals is provided with for vacuumizing sealing near two ends place in hollow circular cylinder, microminiature Hopkinson rod rear end, mount pad front end is inserted respectively in hollow circular cylinder two ends, hollow circuit cylinder dignity there is linked hole in one and hollow circular cylinder, for vacuumizing.D. laser is irradiated to the shock zone of microminiature Hopkinson bar, be absorbed by the absorption layer generation plasma, plasma is subject to the constraint of the restraint layer covered above absorption layer, produce high-strength impact wave impact microminiature Hopkinson bar front end, make microminiature Hopkinson bar inside obtain a stress pulse.
According to the device of the extremely narrow acceleration pumping signal of above-described generation, technical characterstic also has: described high power pulsed laser is the laser sent by YAG high power pulsed laser, and this laser spot diameter size is 4mm ~ 6mm, pulsewidth is 1ns ~ 60ns, energy is 70 ~ 1200MJ (megajoule).
According to the device of the extremely narrow acceleration pumping signal of above-described generation, technical characterstic also has: described microminiature Hopkinson bar detailed construction has: microminiature Hopkinson shank diameter is chosen as 5mm or 8mm or 10mm, and length is chosen as 20mm ~ 300mm.
According to the device of the extremely narrow acceleration pumping signal of above-described generation, technical characterstic also has: the extremely narrow acceleration pumping signal produced described in a., its pulsewidth is less than 6us.B. this device also can comprise shaft orientation laser interferometer, and adjustment shaft orientation laser interferometer makes the extremely narrow acceleration pumping signal of measurement normal.Described adjustment shaft orientation laser interferometer is the lens focus of regulating shaft to laser interferometer, makes indicator signal reach full lattice.C. this device also can comprise computing machine, wave tracer and charge amplifier, computer recording and process by the signal of the accelerometer with high g values of wave tracer record, and shaft orientation laser interferometer measurement, by the extremely narrow acceleration pumping signal exported from microminiature Hopkinson rod rear end of wave tracer record.Described accelerometer with high g values is piezoelectric type, pressure resistance type velograph, and its range index is greater than 100000g.
Method advantage based on the extremely narrow acceleration pumping signal of pulse laser generation of the present invention has: 1. propose first to irradiate by intense pulse laser the method that microminiature Hopkinson bar obtains extremely narrow acceleration pumping signal; 2. the method has very high practical value in accelerometer with high g values dynamic calibration.The advantage of the device of the extremely narrow acceleration pumping signal of generation of the present invention has: 1. apparatus structure is simple, and test operation process is easy; 2. can realize the dynamic calibration of accelerometer with high g values gamut scope.Thisly produce the method for extremely narrow acceleration pumping signal based on pulse laser and produce the device value of extremely narrow acceleration pumping signal and must adopt and promote.
Figure of description of the present invention has 2 width:
Fig. 1 is the apparatus structure block diagram producing extremely narrow acceleration pumping signal;
Fig. 2 is microminiature Hopkinson bar front end detailed structure view.
In two figure, have employed generic reference numeral, namely same object uses same label in two figure.In two figure: 1.YAG superpower laser; 2. waveform adjustment pad; 3. microminiature Hopkinson bar; 4. mount pad; 5. accelerometer with high g values; 6. shaft orientation laser interferometer; 7. charge amplifier; 8. wave tracer; 9. computing machine; 10. optical glass sheet; 11. aluminium foils; 12. clear binders; 13. common adhesive.
Accompanying drawing explanation
Embodiment
Embodiments of the invention comprise the embodiment of two technical schemes: the first is about the embodiment of device producing extremely narrow acceleration pumping signal, and it two is embodiments about the method producing extremely narrow acceleration pumping signal based on pulse laser.
The first, the non-limiting examples producing the device of extremely narrow acceleration pumping signal is as follows:
Embodiment one. produce the device of extremely narrow acceleration pumping signal
The device of the extremely narrow acceleration pumping signal of this generation of this example, technical characterstic is: the device of the extremely narrow acceleration pumping signal of generation of this example includes high power pulsed laser, microminiature Hopkinson bar etc., this example produces the concrete structure of the device of extremely narrow acceleration pumping signal by Fig. 1, Fig. 2 combines and illustrates, the device of an extremely narrow acceleration pumping signal of the generation of the whole series with utility appliance instrument is illustrated by Fig. 1, Fig. 1 is the structured flowchart of the device producing extremely narrow acceleration pumping signal, wherein: 1 is YAG superpower laser, 2 is waveform adjustment pads, 3 is microminiature Hopkinson bars, 4 is mount pads, 5 is accelerometer with high g values, 6 is shaft orientation laser interferometers, 7 is charge amplifiers, 8 is wave tracers, 9 is computing machines.This cover produces the device of extremely narrow acceleration pumping signal, adopts high power arteries and veins light device to irradiate microminiature Hopkinson bar front end, makes to produce shock wave i.e. extremely narrow acceleration pumping signal in microminiature Hopkinson bar instantaneously.The device of the extremely narrow acceleration pumping signal of generation of this example specifically assembles, debugging step is: a. regulates spot diameter and the intensity size of YAG high power pulsed laser Output of laser, makes parameter meet this matching requirements standard.Described YAG is yttrium aluminum garnet.B. will produce extremely narrow acceleration pumping signal, this device is selected to adopt microminiature Hopkinson bar.The microminiature Hopkinson bar detailed construction of this example is as follows: microminiature Hopkinson bar 3 diameter is chosen as 5mm, length is chosen as 20mm, microminiature Hopkinson bar front end detailed structure view is illustrated by Fig. 2 and assembles by structure shown in Fig. 2, shown in Fig. 2: 10 is optical glass sheets, 11 is aluminium foils, 12 is clear binders, and 13 is common adhesive.Select to adopt aluminium foil 11 to do restraint layer as energy-absorbing layer and glass 10 to be attached on the coplanar laser illumination of waveform adjustment pad 2 of protection microminiature Hopkinson bar 3 front end by common adhesive 13 and clear binder 12 successively.Described this example of common adhesive 13 selects butter.502 cementing agents selected by described clear binder 12.Described waveform adjustment pad 2 is 2A12 aluminium with Hopkinson bar 3 same diameter, Material selec-tion, and thickness is the pad of 3mm, adopts common adhesive 13 to be attached to microminiature Hopkinson bar 3 front end.C. the front end face of mount pad 4 is closely pull-in on the end of microminiature Hopkinson bar 3 by vacuum fixture, and accelerometer with high g values 5 is arranged on the rear end of mount pad 4 by helicitic texture, in the narrow acceleration pumping signal of this accelerometer 5 output terminal output stage.Said mount pad 4 is one and has the right cylinder of same diameter with microminiature Hopkinson bar 3, and rear end has vertically for installing ring shaped thread in accelerometer with high g values 5.Described microminiature Hopkinson 3 rear end is arranged on mount pad 4 front end by vacuum tight adhesive, the structure of its vacuum tight adhesive is a hollow circular cylinder, O-ring seals is provided with for vacuumizing sealing near two ends place in hollow circular cylinder, microminiature Hopkinson bar 3 rear end is inserted respectively in hollow circular cylinder two ends, mount pad 4 front end, make Hopkinson bar 3 rear end face and mount pad 4 front end face close contact, hollow circuit cylinder dignity there is linked hole in one and hollow circular cylinder, for vacuumizing, vacuumizing in situation, Hopkinson bar 3 rear end face and mount pad 4 front end face form vacuum tight and contact.Mount pad 4 rear end of this example is connected by supporting helicitic texture with accelerometer with high g values 5, and makes mount pad 4 rear end face be formed to contact with accelerometer with high g values 5 input end and connect.Laser is irradiated to the shock zone of microminiature Hopkinson bar 3, absorbed layer 11 absorbs and produces plasma, plasma is subject to the constraint of the restraint layer 10 covered above absorption layer 11, produce the front end of high-strength impact wave impact microminiature Hopkinson bar 3, microminiature Hopkinson bar 3 inside is made to obtain a stress pulse, the i.e. extremely narrow acceleration pumping signal of this example generation, its pulsewidth is less than 6us.D. the high power pulsed laser of this example is the laser sent by YAG high power pulsed laser 1, and this laser spot diameter size is 4mm, pulsewidth is 1ns, energy is 70MJ (megajoule).E. the device of this example also can comprise shaft orientation laser interferometer 6, and adjustment shaft orientation laser interferometer 6 makes the extremely narrow acceleration pumping signal of measurement normal.Described adjustment shaft orientation laser interferometer 6 is regulating shaft lens focus to laser interferometer 6, makes indicator signal reach full lattice.F. the device of this example also can comprise computing machine 9 and wave tracer 8 and charge amplifier 7, computing machine 9 records and processes the signal of the accelerometer with high g values 5 recorded by wave tracer 8, and shaft orientation laser interferometer 6 measure, by wave tracer 8 record from microminiature Hopkinson bar 3 rear end export extremely narrow acceleration pumping signal.The accelerometer with high g values 5 of this example is piezoelectric type, pressure resistance type velograph, and its range index must be greater than 100000g.
Embodiment two. produce the device of extremely narrow acceleration pumping signal
The concrete structure of the device of the extremely narrow acceleration pumping signal of generation of this example is combined by Fig. 1, Fig. 2 and is illustrated, the device difference of the device of the extremely narrow acceleration pumping signal of generation of this example and the extremely narrow acceleration pumping signal of generation of embodiment one has: 1. microminiature Hopkinson bar 3 detailed construction of this example has: microminiature Hopkinson bar 3 diameter is chosen as 8mm, and length is chosen as 50mm.2. the common adhesive 13 of this example is chosen as vaseline.3. the waveform adjustment pad 2 of this example is Q235 steel with Hopkinson bar 3 same diameter, Material selec-tion.4. the high power pulsed laser of this example is the laser sent by YAG high power pulsed laser, and this laser spot diameter size is 5mm, pulsewidth is 10ns, energy is 100MJ or 200MJ (megajoule).The device of the extremely narrow acceleration pumping signal of generation of this example all the other do not state, be entirely same as described in embodiment one, no longer repeat.
Embodiment three. produce the device of extremely narrow acceleration pumping signal
The concrete structure of the device of the extremely narrow acceleration pumping signal of generation of this example is combined by Fig. 1, Fig. 2 and is illustrated, the device difference of the extremely narrow acceleration pumping signal of generation of the device of the extremely narrow acceleration pumping signal of generation of this example and embodiment one, embodiment two has: 1. microminiature Hopkinson bar 3 detailed construction of this example has: microminiature Hopkinson bar 3 diameter is chosen as 10mm, and length is chosen as 100mm or 150mm.2. the high power pulsed laser of this example is the laser sent by YAG high power pulsed laser, and this laser spot diameter size is 6mm, pulsewidth is 20ns or 30ns, energy is 300MJ or 400MJ or 500MJ (megajoule).The device of the extremely narrow acceleration pumping signal of generation of this example all the other do not state, be entirely same as described in embodiment one, embodiment two, no longer repeat.
Embodiment four. produce the device of extremely narrow acceleration pumping signal
The concrete structure of the device of the extremely narrow acceleration pumping signal of generation of this example is combined by Fig. 1, Fig. 2 and is illustrated, the device difference of the device of the extremely narrow acceleration pumping signal of generation of this example and the extremely narrow acceleration pumping signal of generation of embodiment one ~ embodiment three has: 1. microminiature Hopkinson bar 3 detailed construction of this example has: microminiature Hopkinson bar 3 diameter is chosen as 5mm or 8mm or 10mm, and length is chosen as 200mm or 250mm or 300mm.2. the high power pulsed laser of this example is the laser sent by YAG high power pulsed laser, and this laser spot diameter size is 4mm or 5mm or 6mm, pulsewidth is 40ns or 50ns or 60ns, energy is 600MJ or 700MJ or 800MJ or 900MJ or 1000MJ or 1100MJ or 1200MJ (megajoule).The device of the extremely narrow acceleration pumping signal of generation of this example all the other do not state, be entirely same as described in embodiment one ~ embodiment three, no longer repeat.
The second, the non-limiting examples producing the method for extremely narrow acceleration pumping signal based on pulse laser is as follows:
Embodiment one. the method for extremely narrow acceleration pumping signal is produced based on pulse laser
This method producing extremely narrow acceleration pumping signal based on pulse laser of this example, technical characterstic is: the method for the extremely narrow acceleration pumping signal of described generation is: adopt high power pulsed laser to irradiate microminiature Hopkinson bar front end, make to produce the namely extremely narrow acceleration pumping signal of shock wave in microminiature Hopkinson bar instantaneously.The experimental formula that can form acceleration wave minimum pulse width in described microminiature Hopkinson bar is:
In formula, r, l are respectively Hopkinson bar radius and length; C is stress wave velocity of wave.If it is enough narrow to produce excitation pulsewidth, therefore r, l value is little.Will produce extremely narrow acceleration pumping signal in this method, the extremely narrow acceleration pumping signal that this example produces, its pulsewidth is less than 6us, therefore will adopt microminiature Hopkinson bar in this method.In order to realize the method producing extremely narrow acceleration pumping signal based on pulse laser, the device producing extremely narrow acceleration pumping signal must be adopted, this example produces the device concrete structure of extremely narrow acceleration pumping signal by Fig. 1, Fig. 2 combines and illustrates, the device of an extremely narrow acceleration pumping signal of the generation of the whole series with utility appliance instrument is illustrated by Fig. 1, Fig. 1 is the structured flowchart of the device producing extremely narrow acceleration pumping signal, wherein: 1 is YAG superpower laser, 2 is waveform adjustment pads, 3 is microminiature Hopkinson bars, 4 is mount pads, 5 is accelerometer with high g values, 6 is shaft orientation laser interferometers, 7 is charge amplifiers, 8 is wave tracers, 9 is computing machines.Produce in the device of extremely narrow acceleration pumping signal at this cover, the high power pulsed laser of this example is the laser sent by YAG high power pulsed laser 1, and this laser spot diameter size is 4mm, pulsewidth is 1ns, energy is 70MJ (megajoule).Described YAG is yttrium aluminum garnet.The microminiature Hopkinson bar detailed construction of this example is as follows: microminiature Hopkinson bar 3 diameter is chosen as 5mm, length is chosen as 20mm, microminiature Hopkinson bar 3 front end detailed structure view is illustrated by Fig. 2 and assembles by structure shown in Fig. 2, shown in Fig. 2: 10 is optical glass sheets, 11 is aluminium foils, 12 is clear binders, 13 is common adhesive, in fig. 2: waveform adjustment pad 2 is attached to the front end of bar 3 by common adhesive 13, the coplanar laser illumination of waveform adjustment pad 2 sticks aluminium foil 11 absorption layer by common adhesive 13 equally, again optical glass sheet 10 clear binder 12 is attached on aluminium foil 11 absorption layer, the rear end of microminiature Hopkinson bar 3 is arranged on mount pad 4 front end by vacuum tight adhesive, accelerometer with high g values 5 is arranged on the rear end of mount pad 4 by helicitic texture, in the narrow acceleration pumping signal of this accelerometer 5 output terminal output stage.The common adhesive 13 of this example selects butter.502 cementing agents selected by the clear binder 12 of this example.Described waveform adjustment pad 2 is 2A12 aluminium with Hopkinson bar same diameter, Material selec-tion, and thickness is the pad of 3mm.The mount pad 4 of this example is one and has the right cylinder of same diameter with microminiature Hopkinson bar 3, and rear end has vertically for installing ring shaped thread in accelerometer with high g values 5.Microminiature Hopkinson 3 rear end of this example is arranged on mount pad 4 front end by vacuum tight adhesive, the structure of its vacuum tight adhesive is a hollow circular cylinder, O-ring seals is provided with for vacuumizing sealing near two ends place in hollow circular cylinder, microminiature Hopkinson bar 3 rear end is inserted respectively in hollow circular cylinder two ends, mount pad 4 front end, make Hopkinson bar 3 rear end face and mount pad 4 front end face close contact, hollow circuit cylinder dignity there is linked hole in one and hollow circular cylinder, for vacuumizing, vacuumizing in situation, Hopkinson bar 3 rear end face and mount pad 4 front end face form vacuum tight and contact.Mount pad 4 rear end of this example is connected by supporting helicitic texture with accelerometer with high g values 5, and makes mount pad 4 rear end face be formed to contact with accelerometer with high g values 5 input end and connect.Adjustment shaft orientation laser interferometer 6 makes the extremely narrow acceleration pumping signal of measurement normal.Computing machine 9 records and processes the signal of the accelerometer with high g values 5 recorded by wave tracer 8, and shaft orientation laser interferometer 6 is measured, extremely narrow acceleration pumping signal that the rear end from microminiature Hopkinson bar 3 of being recorded by wave tracer 8 is exported.Described adjustment shaft orientation laser interferometer 6 is regulating shaft lens focus to laser interferometer 6, makes indicator signal reach full lattice.Described accelerometer with high g values 5 is piezoelectric type, pressure resistance type velograph, and its range index is greater than 100000g.
Embodiment two. the method for extremely narrow acceleration pumping signal is produced based on pulse laser
The device realization producing the extremely narrow acceleration pumping signal of method employing generation of extremely narrow acceleration pumping signal based on pulse laser of this example, the device concrete structure of the extremely narrow acceleration pumping signal of generation of this example is combined by Fig. 1, Fig. 2 and is illustrated, the method difference producing extremely narrow acceleration pumping signal based on pulse laser producing the method for extremely narrow acceleration pumping signal and embodiment one based on pulse laser of this example has: 1. microminiature Hopkinson bar 3 detailed construction of this example has: microminiature Hopkinson bar 3 diameter is chosen as 8mm, and length is chosen as 50mm.2. the common adhesive 13 of this example is chosen as vaseline.3. the waveform adjustment pad 2 of this example is Q235 steel with Hopkinson bar 3 same diameter, Material selec-tion.4. the high power pulsed laser of this example is the laser sent by YAG high power pulsed laser, and this laser spot diameter size is 5mm, pulsewidth is 10ns, energy is 100MJ or 200MJ (megajoule).This example based on pulse laser produce extremely narrow acceleration pumping signal method all the other do not state, be entirely same as described in embodiment one, no longer repeat.
Embodiment three. the method for extremely narrow acceleration pumping signal is produced based on pulse laser
The device realization producing the extremely narrow acceleration pumping signal of method employing generation of extremely narrow acceleration pumping signal based on pulse laser of this example, the concrete structure of the device of the extremely narrow acceleration pumping signal of generation of this example is by Fig. 1, Fig. 2 combines and illustrates, the method and the embodiment one that produce extremely narrow acceleration pumping signal based on pulse laser of this example, the method difference based on the extremely narrow acceleration pumping signal of pulse laser generation of embodiment two has: 1. microminiature Hopkinson bar 3 detailed construction of this example has: microminiature Hopkinson bar 3 diameter is chosen as 10mm, length is chosen as 100mm, or 150mm.2. the high power pulsed laser of this example is the laser sent by YAG high power pulsed laser, and this laser spot diameter size is 6mm, pulsewidth is 20ns or 30ns, energy is 300MJ or 400MJ or 500MJ (megajoule).This example based on pulse laser produce extremely narrow acceleration pumping signal method all the other do not state, be entirely same as described in embodiment one, embodiment two, no longer repeat.
Embodiment four. the method for extremely narrow acceleration pumping signal is produced based on pulse laser
The device realization producing the extremely narrow acceleration pumping signal of method employing generation of extremely narrow acceleration pumping signal based on pulse laser of this example, the concrete structure of the device of the extremely narrow acceleration pumping signal of generation of this example is by Fig. 1, Fig. 2 combines and illustrates, the method difference producing extremely narrow acceleration pumping signal based on pulse laser producing the method for extremely narrow acceleration pumping signal and embodiment one ~ embodiment three based on pulse laser of this example has: 1. microminiature Hopkinson bar 3 detailed construction of this example has: microminiature Hopkinson bar 3 diameter is chosen as 5mm, or 8mm, or 10mm, length is chosen as 200mm, or 250mm, or 300mm.2. the high power pulsed laser of this example is the laser sent by YAG high power pulsed laser, and this laser spot diameter size is 4mm or 5mm or 6mm, pulsewidth is 40ns or 50ns or 60ns, energy is 600MJ or 700MJ or 800MJ or 900MJ or 1000MJ or 1100MJ or 1200MJ (megajoule).This example based on pulse laser produce extremely narrow acceleration pumping signal method all the other do not state, be entirely same as described in embodiment one ~ embodiment three, no longer repeat.
Claims (10)
1. one kind produces the method for extremely narrow acceleration pumping signal based on pulse laser, be characterised in that: the method for the extremely narrow acceleration pumping signal of described generation is: adopt high power pulsed laser to irradiate microminiature Hopkinson bar front end, make in microminiature Hopkinson bar, to produce the namely extremely narrow acceleration pumping signal of shock wave instantaneously.
2. the method producing extremely narrow acceleration pumping signal based on pulse laser according to claim 1, be characterised in that: described high power pulsed laser is the laser sent by YAG high power pulsed laser, this laser spot diameter size is 4mm ~ 6mm, pulsewidth is 1ns ~ 60ns, energy is 70MJ ~ 1200MJ.
3. the method producing extremely narrow acceleration pumping signal based on pulse laser according to claim 1, be characterised in that: the structure of described microminiature Hopkinson bar is: waveform adjustment pad is attached to the front end of bar by common adhesive, the coplanar laser illumination of waveform adjustment pad sticks aluminium foil absorption layer by common adhesive equally, again optical glass sheet clear binder is attached on aluminium foil absorption layer, the rear end of microminiature Hopkinson bar is arranged on mount pad front end by vacuum tight adhesive, accelerometer with high g values is arranged on the rear end of mount pad by helicitic texture, in the narrow acceleration pumping signal of this accelerometer output terminal output stage, said mount pad is one and has the right cylinder of same diameter with microminiature Hopkinson bar, rear end has vertically for installing ring shaped thread in accelerometer with high g values.
4. the method producing extremely narrow acceleration pumping signal based on pulse laser according to claim 3, be characterised in that: described microminiature Hopkinson bar detailed construction has: microminiature Hopkinson shank diameter is chosen as 5mm or 8mm or 10mm, and length is chosen as 20mm ~ 300mm.
5. the method producing extremely narrow acceleration pumping signal based on pulse laser according to claim 1, is characterised in that:
A. the extremely narrow acceleration pumping signal of described generation, its pulsewidth is less than 6
us;
B. adjusting shaft orientation laser interferometer makes the extremely narrow acceleration pumping signal of measurement normal;
C. computer recording and process are by the signal of the accelerometer with high g values of wave tracer record, and shaft orientation laser interferometer measurement, by the extremely narrow acceleration pumping signal exported from microminiature Hopkinson rod rear end of wave tracer record.
6. one kind produces the device of extremely narrow acceleration pumping signal, be characterised in that: the device of the extremely narrow acceleration pumping signal of described generation includes high power pulsed laser, microminiature Hopkinson bar, adopt high power arteries and veins light laser laser to irradiate microminiature Hopkinson bar front end, make in microminiature Hopkinso n bar, to produce shock wave i.e. extremely narrow acceleration pumping signal instantaneously.
7. the device of the extremely narrow acceleration pumping signal of generation according to claim 6, is characterised in that: the device of the extremely narrow acceleration pumping signal of described generation specifically assembles, debugging step is:
A. regulate spot diameter and the intensity size of YAG high power pulsed laser Output of laser, make parameter meet this matching requirements standard;
B. selecting to adopt aluminium foil to do restraint layer as energy-absorbing layer and glass is attached on the coplanar laser illumination of waveform adjustment pad of protection microminiature Hopkinson bar by common adhesive and clear binder successively;
C. the front end face of mount pad is closely pull-in on microminiature Hopkinson bar end by vacuum fixture, accelerometer with high g values is arranged on the rear end of mount pad by helicitic texture, in the narrow acceleration pumping signal of this accelerometer output terminal output stage, said mount pad is one and has the right cylinder of same diameter with microminiature Hopkinson bar, and rear end has for installing ring shaped thread in accelerometer with high g values vertically;
D. laser is irradiated to the shock zone of microminiature Hopkinson bar, be absorbed by the absorption layer generation plasma, plasma is subject to the constraint of the restraint layer covered above absorption layer, produce high-strength impact wave impact microminiature Hopkinson bar front end, make microminiature Hopkinson bar inside obtain a stress pulse.
8. the device of the extremely narrow acceleration pumping signal of generation according to claim 7, be characterised in that: described high power pulsed laser is the laser sent by YAG high power pulsed laser, this laser spot diameter size is 4mm ~ 6mm, pulsewidth is 1ns ~ 60ns, energy is 70MJ ~ 1200MJ.
9. the device of the extremely narrow acceleration pumping signal of generation according to claim 7, be characterised in that: described microminiature Hopkinson bar detailed construction has: microminiature Hopkinson shank diameter is chosen as 5mm or 8mm or 10mm, and length is chosen as 20mm ~ 300mm.
10. the device of the extremely narrow acceleration pumping signal of generation according to claim 7, is characterised in that:
A. the extremely narrow acceleration pumping signal of described generation, its pulsewidth is less than 6
us;
B. this device also can comprise shaft orientation laser interferometer, and adjustment shaft orientation laser interferometer makes the extremely narrow acceleration pumping signal of measurement normal;
C. this device also can comprise computing machine and wave tracer, computer recording and process by the signal of the accelerometer with high g values of wave tracer record, and shaft orientation laser interferometer measurement, by the extremely narrow acceleration pumping signal exported from microminiature Hopkinson rod rear end of wave tracer record.
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