CN202330448U - Imaging type laser speed interferometer system used for impulsion diagnosis - Google Patents
Imaging type laser speed interferometer system used for impulsion diagnosis Download PDFInfo
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Abstract
The utility model relates to an imaging type laser speed interferometer system used for impulsion diagnosis. The interferometer system is composed of a laser input subsystem, an image transferring subsystem and an interferometer subsystem, wherein the laser input subsystem comprises a detecting laser, a mechanical shutter and a Pockels cell; the rear side of the Pockels cell is provided with a group of reforming cylindrical lenses used for shaping Gaussian beams into rectangle light beams, and beam splitters and a first lens assembly used for adjusting the size of rectangle facula are successively arranged between the reshaping cylindrical lens and a target; the image transferring subsystem comprises three stages of image transferring lens assemblies, wherein the scattered light on the back surface of the target is collected by a first-stage image transferring lens assembly and successively passes through a second-stage image transferring lens assembly and a third-stage image transferring lens assembly to be imaged on a streak camera; and the interferometer subsystem is arranged between the second-stage image transferring lens assembly and the third-stage image transferring lens assembly. The interferometer system provided by the utility model has good spatial discrimination ability, can improve signal to noise ratio of an image under the condition of lower detection laser energy, thereby improving experiment precision.
Description
Technical field
The utility model belongs to optical measuring apparatus, is specifically related to a kind of imaging-type laser speed interferometer system that is used to impact diagnosis.
Background technology
State equation is described is exactly (p, V, T, E, the funtcional relationship between S) of each state parameter in certain thermodynamic system.The experimental study of state equation receives extensive attention in fields such as geophysics, astrophysics, inertial confinement fusion, material science, nuclear weapon physics, and practical application and state equation theoretical developments are had important meaning.The absolute measurement of current state equation requires to measure particle rapidity u behind shock velocity D and the ripple in the shock wave relational expression independently through experiment, and reckoning obtains remaining shock wave parameter of material then, provides the impact adiabat, promptly impacts the adiabatic condition equation.
In the state equation experimental study, generally carry out the shock wave diagnosis through surveying the luminous signal of shock wave when the target back of the body unloads.Yet as the passive measurement method, IMPULSIVE HEATING is luminous not only to be interfered easily, and its signal intensity extremely relies on impact pressure, can't under relatively low pressure conditions, use.Arbitrary surfaces velocity interferometer (VISAR) is a kind of active optics measuring method, with luminous the comparing of passive measurement shock wave target back of the body unloading, does not receive the strong and weak influence of driving impact wave pressure, and its range of application can be from tens of GPa to TPa.Imaging-type velocity interferometer (Imaging-VISAR) is the velocity interferometer with spatial resolving power; The each point velocity information on target back of the body surface is passed through interferometer system; Form with interference fringe is noted by scanning camera, therefrom can analyze the shock wave transmission speed that obtains in free surface velocity and the step target.
In the prior art, about the application of velocity interferometer in state equation, at " measuring free surface velocity " (" light laser and the particle beams " with the optical recording velocity interferometer; 2006; 18 (5): 799-802 author: Lu Jianxin, Wang Zhao is Liang Jing) in the literary composition; Disclose optical recording velocity interferometer system, be used for measuring the free surface velocity of the shock wave state equation that light laser produces.But this system is the spot speed interferometer, does not possess spatial resolving power, can not in experiment, record shock velocity and free surface velocity simultaneously, thereby can't directly obtain the shock-compression curve of material.Moreover because the Argon ion laser power that is adopted is limited, the image that causes streak camera to be gathered, signal to noise ratio (S/N ratio) is not high, influences the experimental data precision.
The utility model content
The purpose of the utility model is the defective to prior art, and a kind of imaging-type laser speed interferometer system that is used to impact diagnosis is provided, and improves the signal to noise ratio (S/N ratio) of detection image and the precision of experiment.
The technical scheme of the utility model is following: a kind of imaging-type laser speed interferometer system that is used to impact diagnosis; By the laser input subsystem, form as transmitting subsystem and interferometer subsystem; Wherein, Described laser input subsystem comprises detecting laser; And the mechanical shutter and the Pockers cell that set gradually in detecting laser outlet, being provided with one group at the rear side of Pockers cell, to be used for Gauss beam reshaping be the shaping cylindrical lens of rectangular light beam, between shaping cylindrical lens and target, sets gradually beam splitter and first lens combination that is used to adjust the rectangular light spot size; Described picture transmits subsystem and comprises three grades as the relay len group; The first order adopts the reverse setting of said first lens combination as the relay len group; Collect the scattered light on target back of the body surface, pass through second, third level then successively, form images to streak camera as the relay len group; Described interferometer subsystem be located at the second level as relay len group and the third level as between the relay len group.
Further; The aforesaid imaging-type laser speed interferometer system that is used to impact diagnosis; Wherein, described interferometer subsystem comprises two beam splitters and two catoptrons, and first beam splitter will be divided into two bundles as the scattered light of relay len group through the second level; A branch of light is through first mirror reflects to the second beam splitter; Another Shu Guang passes quartzy etalon after second mirror reflects to the second beam splitter, and two-beam forms interference fringe second beam splitter stack, is made up of as relay len the third level then to look like to streak camera.
Further, the aforesaid imaging-type laser speed interferometer system that is used to impact diagnosis, wherein, the spectro-film face of two beam splitters in the described interferometer subsystem is in the opposite direction.
Further, the aforesaid imaging-type laser speed interferometer system that is used to impact diagnosis, wherein, described first lens combination comprises plano-convex lens, cemented doublet, the crescent moon lens that set gradually along the light beam direction of transfer; When first lens combination as the first order during as the relay len group, the scattered light of back face of target passes through crescent moon lens, cemented doublet, plano-convex lens successively.
Further, the aforesaid imaging-type laser speed interferometer system that is used to impact diagnosis, wherein, the described second level comprises cemented doublet and the plano-convex lens that sets gradually along the light beam direction of transfer as the relay len group.
Further, the aforesaid imaging-type laser speed interferometer system that is used to impact diagnosis, wherein, the described third level comprises two cemented doublets that set gradually along the light beam direction of transfer as the relay len group.
Further, the aforesaid imaging-type laser speed interferometer system that is used to impact diagnosis, wherein, described detecting laser adopts semiconductor pumped solid state laser.
Further, the aforesaid imaging-type laser speed interferometer system that is used to impact diagnosis wherein, is provided with optical filter before the described streak camera slit.
The beneficial effect of the utility model is following: the imaging-type laser speed interferometer system that is used for the state equation experimental study that the utility model provides; The scioptics group transfers to streak camera with the scattered light imaging that target back of the body surface produces, and makes velocity interferometer have spatial resolving power; One group of plano-convex plano-concave cylindrical lens behind Pockers cell, placing is shaped as circular gaussian beam a certain size rectangular light beam; Penetrate the line style hot spot through lens imaging in the target rear-projection; When keeping one-dimensional space resolution characteristic, improved scattered light intensity effectively; And, promoted the signal to noise ratio (S/N ratio) of interference fringe greatly through optical filter, finally collect the interference fringe image that comprises time and spatial information clearly simultaneously by streak camera.The utility model has good spatial resolving power, and can under the lower condition of exploring laser light energy, improve the signal to noise ratio (S/N ratio) of image, thereby improves experimental precision.
Description of drawings
Fig. 1 is the velocity interferometer system principle structural representation of the utility model;
Fig. 2 is the structural representation of separate unit rank metallic target.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is carried out detailed description.
As shown in Figure 1; The imaging-type laser speed interferometer system laser input subsystem that is used to impact diagnosis that the utility model provides, form as transmitting 3 parts of subsystem and interferometer subsystem, various devices comprise detecting laser, mechanical shutter, Pockers cell, catoptron, beam splitter, lens, streak camera etc.
The major function of laser input subsystem is to project target back of the body surface to the geomery that exploring laser light needs by experiment, comprises detecting laser 1, and at mechanical shutter and Pockers cell that the detecting laser outlet sets gradually, is used to produce laser pulse.At the rear side of Pockers cell one group of Gauss beam reshaping that is used for the output of exploring laser light source being set is the shaping cylindrical lens of rectangular light beam; Comprise plano-concave cylindrical lens 2 peaceful projection face lens 3; Between shaping cylindrical lens and target 8, set gradually beam splitter 4 and first lens combination that is used to adjust the rectangular light spot size, first lens combination comprises plano-convex lens 5, cemented doublet 6, the crescent moon lens 7 that set gradually along the light beam direction of transfer.Between shaping cylindrical lens and the beam splitter 4 catoptron can be set as required, two-face mirror be used to the to transfer light path of laser is set in the present embodiment.Experiment can be selected according to different experiment contents with target, and main employing is separate unit rank metallic targets in the present experiment, and its structure comprises ablation layer 19 and AI film 20, and is as shown in Figure 2.
The detecting laser that uses in the experiment is semiconductor pumped solid state laser, and output wavelength is the single longitudinal mode laser of 532nm, and bandwidth is less than 5MHz.What exported in the exploring laser light source is Gaussian beam, and spot diameter is 2.3mm, through input light path, penetrates a rectangular light spot that is about the wide about 100 μ m of 1mm in the target rear-projection.
Picture transmits subsystem makes interferometer system have spatial discrimination, and its image quality directly influences measuring accuracy.In the present embodiment, form by 7 lens, be divided into three groups, transmit, become intensified image to streak camera the back face of target scattered light through three grades of pictures as transmission system.Wherein, the first order adopts the reverse setting of above-mentioned first lens combination as the relay len group, collects the scattered light on target back of the body surface, and the scattered light of back face of target is passed to the second level as the relay len group through crescent moon lens 7, cemented doublet 6, plano-convex lens 5 successively.The second level comprises the cemented doublet 9 and plano-convex lens 10 that sets gradually along the light beam direction of transfer as the relay len group.The interferometer subsystem be located at the second level as relay len group and the third level as between the relay len group.The third level comprises two cemented doublets 16,17 that set gradually along the light beam direction of transfer as the relay len group.In addition; In the process that whole scattered light transmits; Can be on the light path suitable catoptron direction of light of transferring that is provided with in the present embodiment, is provided with catoptron as the relay len group between the plano-convex lens 5 and the second level the cemented doublet 9 of the first order as the relay len group; Between the second level is as the cemented doublet 9 of relay len group and plano-convex lens 10, be provided with catoptron, and the third level as two cemented doublets 16 of relay len group, be provided with catoptron between 17.
In the present embodiment, as the relay len group, focal length is that crescent moon lens 7 and the focal length of 150mm is that the cemented doublet 6 of the 300mm 50mm of being separated by places combined focal length 113mm, actual logical light diameter 33mm, F=3.4 for the first order.The plano-convex lens 5 of focal length 1200mm is carried on the back the picture that surperficial 1mm field range is amplified 10 times of written treaties to target with crescent moon lens 7, cemented doublet 6 actings in conjunction; Focal length be cemented doublet 9 and the focal length of 600mm be the plano-convex lens 101 composition second level of 1200mm as the relay len group, enlargement factor is 2, forms images to the beam split face of interferometer output beam splitter 15; At last, cemented doublet 16 and the focal length that by focal length is 600mm is that the cemented doublet 17 of 800mm is formed the third level as the relay len group, forms images to data acquisition system (DAS), and promptly streak camera 18, placement one optical filter before the slit of streak camera 18.The main effect of optical filter is to filter parasitic light, improves the precision of equipment.The optical filter that adopts in the present embodiment has the characteristics of narrow bandwidth high-permeability, and centre wavelength is 532nm (with exploring laser light Wavelength matched).
Interferometer subsystem basic structure adopts the Mach-Zehnder interferometer, comprises 11,15 and two catoptrons 12,13 of two beam splitters.First beam splitter 11 will be a two-way as the scattered light 1:1 beam splitting of relay len group through the second level; A branch of light reflexes to second beam splitter 15 through first catoptron 12; Another Shu Guang passes quartzy etalon 14 after second catoptron 13 reflexes to second beam splitter 15; Two-beam in the light splitting surface formation interference fringe of beam splitter, is formed picture to streak camera by the third level as relay len in 15 stacks of second beam splitter then.The spectro-film of two beam splitters 11,15 wants face in the opposite direction, and the two-beam of interfering so all respectively passes through beam splitter once, eliminates the optical path difference of being brought by beam splitter.The striped constant is that stripe displacement equals 1 o'clock corresponding speed, is confirmed by the thickness of quartzy etalon 14.In general, the quartzy standard that is adopted in the experiment has three thickness: 20mm, 30mm, 40mm at present, can calculate the striped constant of different-thickness etalon under the specific wavelength condition according to the formula that tests the speed.In the state equation experiment, need be according to shock velocity to be measured, the etalon of selected suitable thickness.
Because interferometer system is had relatively high expectations to the face type of eyeglass, considers level of processing and cost factor simultaneously, the employed eyeglass of system is the commodity eyeglass of λ/10.Satisfy accurate zero path difference condition for accurately regulating interferometer, and be convenient to target position is monitored all glasses lens plated broadband deielectric-coating that are.Three beam splitters using in the system all have 2 ° of angles of wedge, though increased the adjusting difficulty, have reduced catoptrical influence between the eyeglass front and rear surfaces.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technology thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.
Claims (8)
1. imaging-type laser speed interferometer system that is used to impact diagnosis; By the laser input subsystem, form as transmitting subsystem and interferometer subsystem; It is characterized in that: described laser input subsystem comprises detecting laser (1); And the mechanical shutter and the Pockers cell that set gradually in detecting laser outlet; Being provided with one group at the rear side of Pockers cell, to be used for Gauss beam reshaping be the shaping cylindrical lens (2,3) of rectangular light beam, between shaping cylindrical lens (2,3) and target (8), sets gradually beam splitter (4) and be used to adjust first lens combination of rectangular light spot size; Described picture transmits subsystem and comprises three grades as the relay len group; The first order adopts the reverse setting of said first lens combination as the relay len group; Collect the scattered light on target back of the body surface, pass through second, third level then successively, form images to streak camera (18) as the relay len group; Described interferometer subsystem be located at the second level as relay len group and the third level as between the relay len group.
2. the imaging-type laser speed interferometer system that is used to impact diagnosis as claimed in claim 1; It is characterized in that: described interferometer subsystem comprises two beam splitters and two catoptrons; First beam splitter (11) will be divided into two bundles as the scattered light of relay len group through the second level; A branch of light reflexes to second beam splitter (15) through first catoptron (12); Another Shu Guang passes quartzy etalon (14) after second catoptron (13) reflexes to second beam splitter (15), and two-beam forms interference fringe second beam splitter stack, forms picture to streak camera (18) by the third level as relay len then.
3. the imaging-type laser speed interferometer system that is used to impact diagnosis as claimed in claim 2 is characterized in that: the spectro-film face of two beam splitters in the described interferometer subsystem (11,15) in the opposite direction.
4. the imaging-type laser speed interferometer system that is used to impact diagnosis as claimed in claim 1 is characterized in that: described first lens combination comprises plano-convex lens (5), cemented doublet (6), the crescent moon lens (7) that set gradually along the light beam direction of transfer; When first lens combination as the first order during as the relay len group, the scattered light of back face of target passes through crescent moon lens (7), cemented doublet (6), plano-convex lens (5) successively.
5. like any described imaging-type laser speed interferometer system that is used to impact diagnosis among the claim 1-4, it is characterized in that: the described second level comprises cemented doublet (9) and the plano-convex lens (10) that sets gradually along the light beam direction of transfer as the relay len group.
6. like any described imaging-type laser speed interferometer system that is used to impact diagnosis among the claim 1-4, it is characterized in that: the described third level comprises two cemented doublets (16,17) that set gradually along the light beam direction of transfer as the relay len group.
7. the imaging-type laser speed interferometer system that is used to impact diagnosis as claimed in claim 1 is characterized in that: described detecting laser (1) adopts semiconductor pumped solid state laser.
8. the imaging-type laser speed interferometer system that is used to impact diagnosis as claimed in claim 1 is characterized in that: be provided with optical filter before the slit of described streak camera (18).
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Cited By (8)
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| CN103760568A (en) * | 2014-01-02 | 2014-04-30 | 中国工程物理研究院流体物理研究所 | Ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer |
| CN104730279A (en) * | 2013-12-20 | 2015-06-24 | 中国工程物理研究院激光聚变研究中心 | Chirped pulse velocity interferometer |
| CN106772418A (en) * | 2017-01-23 | 2017-05-31 | 中国工程物理研究院上海激光等离子体研究所 | The adjusting method of interferometer zero path difference in a kind of ORVIS velocity-measuring systems |
| CN106952668A (en) * | 2017-04-07 | 2017-07-14 | 中国工程物理研究院激光聚变研究中心 | Multifunction laser fusion diagnoses interferometer |
| CN107144361A (en) * | 2017-06-12 | 2017-09-08 | 中国科学院西安光学精密机械研究所 | The consistent any reflecting surface velocity interferometer of many sensitivity of branch target |
| CN107179132A (en) * | 2017-05-09 | 2017-09-19 | 中国工程物理研究院激光聚变研究中心 | Optical fiber image transmission beam velocity interferometer and shock velocity computational methods |
| CN108132197A (en) * | 2017-12-26 | 2018-06-08 | 中国工程物理研究院上海激光等离子体研究所 | A kind of analysis on Uncertainty and computational methods of transparent material impact temperature |
| CN108169512A (en) * | 2017-12-25 | 2018-06-15 | 中国科学院西安光学精密机械研究所 | The compound laser-produced fusion shock velocity measuring system of three sensitivity and method |
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- 2011-11-25 CN CN2011204761554U patent/CN202330448U/en not_active Expired - Lifetime
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| CN104730279A (en) * | 2013-12-20 | 2015-06-24 | 中国工程物理研究院激光聚变研究中心 | Chirped pulse velocity interferometer |
| CN103760568A (en) * | 2014-01-02 | 2014-04-30 | 中国工程物理研究院流体物理研究所 | Ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer |
| CN106772418B (en) * | 2017-01-23 | 2019-02-19 | 中国工程物理研究院上海激光等离子体研究所 | The adjusting method of interferometer zero path difference in a kind of ORVIS velocity-measuring system |
| CN106772418A (en) * | 2017-01-23 | 2017-05-31 | 中国工程物理研究院上海激光等离子体研究所 | The adjusting method of interferometer zero path difference in a kind of ORVIS velocity-measuring systems |
| CN106952668A (en) * | 2017-04-07 | 2017-07-14 | 中国工程物理研究院激光聚变研究中心 | Multifunction laser fusion diagnoses interferometer |
| CN106952668B (en) * | 2017-04-07 | 2018-06-19 | 中国工程物理研究院激光聚变研究中心 | Multifunction laser fusion diagnoses interferometer |
| CN107179132A (en) * | 2017-05-09 | 2017-09-19 | 中国工程物理研究院激光聚变研究中心 | Optical fiber image transmission beam velocity interferometer and shock velocity computational methods |
| CN107179132B (en) * | 2017-05-09 | 2023-04-14 | 中国工程物理研究院激光聚变研究中心 | Optical fiber image transmission beam velocity interferometer and shock wave velocity calculation method |
| CN107144361A (en) * | 2017-06-12 | 2017-09-08 | 中国科学院西安光学精密机械研究所 | The consistent any reflecting surface velocity interferometer of many sensitivity of branch target |
| CN107144361B (en) * | 2017-06-12 | 2023-04-11 | 中国科学院西安光学精密机械研究所 | Multi-sensitivity arbitrary reflection surface velocity interferometer with consistent branch targets |
| CN108169512A (en) * | 2017-12-25 | 2018-06-15 | 中国科学院西安光学精密机械研究所 | The compound laser-produced fusion shock velocity measuring system of three sensitivity and method |
| CN108169512B (en) * | 2017-12-25 | 2024-01-05 | 中国科学院西安光学精密机械研究所 | Three-sensitivity composite laser fusion shock wave speed measurement system and method |
| CN108132197A (en) * | 2017-12-26 | 2018-06-08 | 中国工程物理研究院上海激光等离子体研究所 | A kind of analysis on Uncertainty and computational methods of transparent material impact temperature |
| CN108132197B (en) * | 2017-12-26 | 2020-04-21 | 中国工程物理研究院上海激光等离子体研究所 | Uncertainty analysis and calculation method for impact temperature of transparent material |
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Granted publication date: 20120711 |