CN107179132B - Optical fiber image transmission beam velocity interferometer and shock wave velocity calculation method - Google Patents
Optical fiber image transmission beam velocity interferometer and shock wave velocity calculation method Download PDFInfo
- Publication number
- CN107179132B CN107179132B CN201710322726.0A CN201710322726A CN107179132B CN 107179132 B CN107179132 B CN 107179132B CN 201710322726 A CN201710322726 A CN 201710322726A CN 107179132 B CN107179132 B CN 107179132B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- laser pulse
- pulse signals
- image transmission
- fiber bundle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 88
- 230000005540 biological transmission Effects 0.000 title claims abstract description 49
- 230000035939 shock Effects 0.000 title claims abstract description 46
- 238000004364 calculation method Methods 0.000 title claims abstract description 12
- 238000003384 imaging method Methods 0.000 claims abstract description 39
- 239000000523 sample Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims description 66
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 46
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000004888 barrier function Effects 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 9
- 238000003745 diagnosis Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000011160 research Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/45—Interferometric spectrometry
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
Abstract
The invention discloses an optical fiber image transmission beam speed interferometer which comprises an imaging module, an optical fiber image transmission beam, an interference module I and an interference module II, wherein the imaging module is used for imaging an image; firstly, a short pulse probe laser is emitted to the optical fiber image transmission beam speed interferometer by a light source, the arrival time difference of two laser pulse signals emitted from an interference module and an interference fringe image are recorded by a fringe camera, then, the short pulse probe laser is emitted to the optical fiber image transmission beam speed interferometer by the light source, the arrival time difference of the two laser pulse signals emitted from a single-mode optical fiber beam branch corresponding to the interference module is recorded by the fringe camera, and finally, the shock wave speed is obtained by calculation. The device and the method can obtain the shock wave speed in a large continuous range, the light path is simple to adjust, the device is not limited by an experimental field and space, the experimental cost is low, and the efficiency is high.
Description
Technical Field
The invention belongs to the technical field of laser measurement, and particularly relates to an optical fiber image transmission beam speed interferometer and a shock wave speed calculation method.
Background
Shock wave diagnostic experiments are commonly used for measuring sample shock characteristics, state equations and the like, and are also used for laser beam modulation in laser fusion research to enhance implosion efficiency. In the shockwave diagnostic experiment, it is necessary to measure the shockwave Velocity in the impact sample using an arbitrary reflecting surface Velocity Interferometer (Velocity Interferometer System for Any Reflector, abbreviated as VISAR).
The VISAR technology is characterized in that: the probe laser hits the shock wave interface of the sample and is reflected and collected, and due to the optical Doppler effect, the returned information light carries the motion information of the shock wave interface. The information light is split and recombined by using a time delay difference frequency technology, interference fringes are generated and recorded on an imaging device. And finally, analyzing the speed information of the loaded and impacted sample by a corresponding image processing technology. Due to differences in experimental conditions or research purposes, VISAR has developed a variety of forms, mainly including two main groups: one is line-VISAR and surface-VISAR technologies based on lensed imaging, and the other is all-fiber VISAR technologies without lensing. The VISAR technology under lens imaging has the advantages that the velocity of shock waves in a large continuous range can be measured simultaneously; the all-fiber VISAR technology has the advantages that complicated adjustment of the light path is not needed, the limitation of the space of an experiment site is avoided, and the experiment cost is low.
With the rapid development of information communication technology, optical fibers have been greatly developed. In the field of optical fibers, single-mode optical fibers do not have the problems of mode dispersion and the like when conducting light beams, so that the characteristics of original input light can be better kept, and the technology of dividing the optical fibers into two or even more than one is mature. I.e. the input light at the entrance can be split into two or more light beams by the single-mode fiber itself, and temporal spatial coherence is still maintained between the light beams. Multiple such fibers may be combined to achieve image propagation and splitting.
In order to enhance the efficiency of the shockwave diagnosis experiment, a new optical fiber image transmission beam velocity interferometer needs to be designed, and can combine two light guide modes of a lens and an optical fiber, and has the advantages of the lens and the optical fiber (the shockwave velocity in a larger continuous range can be obtained, complicated adjustment of a light path is not needed, the shock wave diagnosis experiment is not limited by the space of an experiment site, and the experiment cost is low). More importantly, a method is needed for analyzing the sample speed information of the loaded shock wave through the information acquired by the optical fiber image transmission beam speed interferometer, namely obtaining the shock wave speed.
Disclosure of Invention
In order to solve the technical problems, the invention provides an optical fiber image transmission beam velocity interferometer and a shock wave velocity calculation method, which can obtain shock wave velocity in a large continuous range, are simple in light path adjustment, are not limited by an experiment field and space, and are low in experiment cost and high in efficiency.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides an optic fibre passes image bundle velocity interferometer which the main points lie in: the optical fiber image transmission device comprises an imaging module, an optical fiber image transmission bundle, a first interference module and a second interference module; the probe laser is focused on a target surface through the imaging module and reflects back a laser pulse signal, the laser pulse signal is imaged at the input end of the optical fiber image transmission beam through the imaging module, the laser pulse signal is divided into four parts through the optical fiber image transmission beam I, two laser pulse signals are imaged on the fringe camera I after passing through the interference module I, and the other two laser pulse signals are imaged on the fringe camera II after passing through the interference module II
Structure more than adopting, the image that forms on fringe camera one and fringe camera two all has difference frequency interference fringe, can read respective standing wave number change value and respective two laser pulse signal arrival time differences, can set up the position of keeping away from the target room with interfering module one and interfering module two, can reach conveniently to debugging the light path, saved the space again for laser fusion diagnosis experiment platform, make things convenient for going on of other diagnosis work, do not receive the restriction of experiment place space, the experiment is with low costs, high efficiency, and can acquire great continuous range's shock wave speed.
Preferably, the method comprises the following steps: the imaging module comprises a first collimating lens, a second collimating lens, a converging lens, a beam splitter and a light collecting lens; the probe laser sequentially passes through the second collimating lens, the converging lens, the beam splitter, the first collimating lens and the light collecting lens and then is focused on a target surface and reflected back to a laser pulse signal, and the laser pulse signal sequentially passes through the light collecting lens, the collimating lens and the beam splitter and then is imaged at the input end of the optical fiber image transmission beam. By adopting the structure, the beam splitter, the convergent lens and the collimating lens are located near the target chamber, and the light collecting lens and the collimating lens are located in the target chamber, so that the imaging module has a compact structure, and further saves space for a laser fusion diagnosis experiment platform.
Preferably, the method comprises the following steps: the optical fiber image transmission bundle comprises a single-mode optical fiber bundle trunk, a single-mode optical fiber bundle branch I, a single-mode optical fiber bundle branch II, a single-mode optical fiber bundle branch III and a single-mode optical fiber bundle branch IV which are all communicated with the single-mode optical fiber bundle trunk; laser pulse signals reflected by the target surface are imaged at the input end of the single-mode fiber bundle trunk, laser pulse signals emitted by the single-mode fiber bundle branch I and the single-mode fiber bundle branch II are emitted into the interference module I, and laser pulse signals emitted by the single-mode fiber bundle branch III and the single-mode fiber bundle branch IV are emitted into the interference module II. By adopting the structure, the single-mode optical fiber bundle trunk can be very long and can be bent, and the optical path can be led to a position far away from a target chamber, so that the convenience of optical path debugging is greatly improved; and the laser pulse signal (imaging information) is divided into four by the single-mode optical fiber beam branch I, the single-mode optical fiber beam branch II, the single-mode optical fiber beam branch III and the single-mode optical fiber beam branch IV, and a difference frequency effect is formed.
Preferably, the method comprises the following steps: the first interference module comprises a third collimating lens, a fourth collimating lens, a first etalon, a first reflecting mirror, a first beam combining mirror and a first imaging lens; laser pulse signals incident from the single-mode fiber bundle branch circuit I sequentially pass through the collimating lens III and the etalon I and then are emitted to the beam combining mirror I, laser pulse signals incident from the single-mode fiber bundle branch circuit II sequentially pass through the collimating lens IV and the reflector I and then are emitted to the beam combining mirror I, the beam combining mirror combines laser pulse signals incident from the etalon I and the reflector I, and the combined laser pulse signals are emitted outwards through the imaging lens I. By adopting the structure, the laser pulse signal with difference frequency information can enable an image formed on the fringe camera I to have interference fringes through the interference module I, and the shock wave speed is calculated according to information such as the interference fringes.
Preferably, the method comprises the following steps: the second interference module comprises a fifth collimating lens, a sixth collimating lens, a second etalon, a second reflecting mirror, a second beam combining mirror and a second imaging lens; laser pulse signals incident from the single-mode fiber bundle branch circuit IV sequentially pass through the collimating lens VI and the etalon II and then are emitted to the beam combining mirror II, laser pulse signals incident from the single-mode fiber bundle branch circuit III sequentially pass through the collimating lens V and the reflector II and then are emitted to the beam combining mirror II, the laser pulse signals incident from the etalon II and the reflector II are combined by the beam combining mirror II, and the combined laser pulse signals are emitted outwards through the imaging lens II. By adopting the structure, the laser pulse signal with difference frequency information can enable an image formed on the fringe camera II to have interference fringes through the interference module I, and the shock wave speed is calculated according to information such as the interference fringes.
Preferably, the method comprises the following steps: the length of the first etalon is larger than or smaller than that of the second etalon. By adopting the structure, double-sensitivity measurement is formed, and the acquisition of the difference frequency interference pattern is completed.
Preferably, the method comprises the following steps: the length of the single-mode optical fiber bundle branch I is larger than or smaller than that of the single-mode optical fiber bundle branch II. By adopting the structure, the length difference of the image transmission light path is formed, and the difference frequency effect is formed.
Preferably, the method comprises the following steps: the length of the third single-mode fiber bundle branch is greater than or less than that of the fourth single-mode fiber bundle branch. By adopting the structure, the length difference of the image transmission light path is formed, and the difference frequency effect is formed.
Preferably, the method comprises the following steps: the imaging module further comprises a light barrier, probe laser sequentially passes through a second collimating lens and a converging lens and then is emitted to the beam splitter, the beam splitter divides the probe laser into two beams, one beam of the probe laser is emitted to the first collimating lens, and the other beam of the probe laser is emitted to the light barrier. By adopting the structure, the probe laser can be effectively prevented from emitting outwards through the light barrier.
A shock wave velocity calculation method based on an optical fiber image transmission beam velocity interferometer is characterized by comprising the following steps:
s1: transmitting a short wave length of lambda from light source to optical fiber image transmission beam speed interferometerPulse probe laser, and fringe camera for recording arrival time difference tau of two laser pulse signals emitted from interference module 1 And a standing wave number variation value F (t) of the interference fringe image;
s2: emitting a short pulse probe laser with the wavelength of lambda from a light source to an optical fiber image transmission beam speed interferometer, and recording the arrival time difference tau of laser pulse signals emitted by two single-mode optical fiber beam branches corresponding to an interference module by using a fringe camera 2 ；
S3: calculating to obtain the shock wave velocity u (t), and the specific steps comprise:
s31: the standing wave number change value F (t) of the laser pulse signal recorded by the fringe camera due to difference frequency interference satisfies the following conditions:
in the formula (1), c is the speed of light, lambda is the wavelength of the probe laser, and tau 1 The time difference of arrival of two laser pulse signals emitted from the interference module is recorded by a fringe camera;
according to the optical Doppler effect formula
Substituting the compound into formula (1) to obtain:
s32: arrival time difference tau of two laser pulse signals emitted from interference module 1 Satisfies the following conditions:
in the formula (3), n is refractive index of the optical fiber and etalon, l 1 Difference in fiber length of two single-mode fiber bundle branches for transmitting laser pulse signals to interference module 2 Is the difference in length of the two imaging paths of the interference module, h 1 Is a labelThe length of the reticle is such that,
and (4) performing differential transformation on the formula (3) to obtain:
s33: substituting the formula (3) and the formula (4) into the formula (2) to obtain:
s34: the arrival time difference of laser pulse signals emitted by two single-mode fiber bundle branches recorded by a fringe camera
Substituting it into formula (5) to obtain:
s35: because one laser pulse signal is delayed by an etalon a ＝nh 1 And/c, substituting the equation into the equation (6) to obtain a calculation formula of the shock wave velocity u (t):
in the formula (7), the refractive index n and the refractive index dispersion value
Factory information of both the optical fiber and the etalon, and the etalon delay tau a The standing wave number variation F (t) is factory information of the etalon by reading an interference fringe image recorded by a fringe camera.
By adopting the method, the shock wave speed can be calculated through the information collected by the optical fiber image transmission beam speed interferometer.
Compared with the prior art, the invention has the beneficial effects that:
the optical fiber image transmission beam velocity interferometer and the shock wave velocity calculation method provided by the invention can obtain the shock wave velocity in a large continuous range, are simple in light path adjustment, are not limited by an experimental field and space, and are low in experimental cost and high in efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an optical fiber image transmission beam velocity interferometer according to the present invention.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
As shown in figure 1, the optical fiber image transmission beam velocity interferometer comprises an imaging module, an optical fiber image transmission beam, a first interference module and a second interference module, probe laser emitted by a light source 8 is focused on a target surface 1 through the imaging module and carries laser pulse signals of shock wave interface motion information from the target surface 1, the laser pulse signals are imaged at the input end of the optical fiber image transmission beam through the imaging module, the laser pulse signals are divided into four through the first optical fiber image transmission beam, two laser pulse signals carrying the shock wave interface motion information and difference frequency information enter the first interference module, finally an image with interference fringes is formed on a first fringe camera 17, and a variation value F of a standing wave number can be read 1 (t) and the arrival time difference τ of the two laser pulse signals 10 The other two laser pulse signals carrying shock wave interface motion information and difference frequency information enter the second interference module, and finally an image with interference fringes is formed on the second fringe camera 25, so that the change value F of the standing wave number can be read 2 (t) and the difference of arrival time of two laser pulse signals 30 。
Referring to fig. 1, the imaging module includes a first collimating lens 3, a second collimating lens 7, a converging lens 6, a beam splitter 5, a light collecting lens 2, and a light barrier 4.
Referring to fig. 1, the optical fiber image-transmitting bundle includes a single-mode fiber bundle trunk 9, and a single-mode fiber bundle branch line i 10, a single-mode fiber bundle branch line ii 12, a single-mode fiber bundle branch line i 18, and a single-mode fiber bundle branch line i 21 all communicated with the single-mode fiber bundle trunk 9, in order to form a difference frequency effect, the length of the single-mode fiber bundle branch line i 10 is greater than or less than the length of the single-mode fiber bundle branch line ii 12, the length of the single-mode fiber bundle branch line i 18 is greater than or less than the length of the single-mode fiber bundle branch line i 21, and a difference between the lengths of the single-mode fiber bundle branch line i 10 and the single-mode fiber bundle branch line ii 12 is different from a difference between the lengths of the single-mode fiber bundle branch line i 18 and the single-mode fiber bundle branch line ii 21, and needs to be set to a specific value actually required.
Referring to fig. 1, the first interference module includes a third collimating lens 11, a fourth collimating lens 13, a first etalon 26, a first reflector 14, a first beam combiner 15 and a first imaging lens 16; the second interference module comprises a fifth collimating lens 19, a sixth collimating lens 22, a second etalon 27, a second reflecting mirror 20, a second beam combiner 23 and a second imaging lens 24; the length of the first etalon 26 is larger than or smaller than that of the second etalon 27, so that the first etalon 26 and the second etalon 27 form different time delays for laser pulse signals, double-sensitivity measurement is further formed, and acquisition of a difference frequency interference pattern is completed.
The probe laser emitted by the light source 8 is collimated by the second collimating lens 7, then focused by the converging lens 6 and emitted to the beam splitter 5, the probe laser is split into two beams by the beam splitter 5, one beam is blocked by the light barrier 4, the other beam is collimated by the first collimating lens 3 again and then converged to the target surface 1 by the light collecting lens 2, the laser pulse signal reflected from the target surface 1 carries shock wave interface motion information and is collected by the light collecting lens 2 and then projected onto the beam splitter 5 by the collimating lens 3, the beam splitter 5 reflects a part of the laser pulse signal to the converging lens 6, the other part of the laser pulse signal is transmitted, the transmitted laser pulse signal is imaged at the input end of the single-mode fiber beam trunk 9, the imaged laser pulse signal is transmitted and split by the single-mode fiber beam and respectively enters the first single-mode fiber beam branch 10, the second single-mode fiber beam branch 12, the third single-mode fiber beam branch 18 and the fourth single-mode fiber beam branch 21, and respective output ends of the imaged laser pulse signal are imaged. Laser pulse signals emitted by the single-mode fiber bundle branch I10 and the single-mode fiber bundle branch II 12 enter the interference module I, and laser pulse signals emitted by the single-mode fiber bundle branch III 18 and the single-mode fiber bundle branch IV 21 enter the interference module II.
Specifically, a laser pulse signal incident from the single-mode fiber bundle branch circuit i 10 sequentially passes through the collimating lens i 11 and the etalon i 26 and then is transmitted to the beam combining mirror i 15, a laser pulse signal incident from the single-mode fiber bundle branch circuit i 12 sequentially passes through the collimating lens i 13 and the reflector i 14 and then is transmitted to the beam combining mirror i 15, the beam combining mirror i 15 combines the laser pulse signals incident from the etalon i 26 and the reflector i 14, the combined laser pulse signal is focused by the imaging lens i 16 and then is transmitted to the fringe camera i 17, an image formed on the fringe camera i 17 has interference fringes, and the shock wave velocity is calculated according to information such as the interference fringes.
Laser pulse signals incident from the single-mode fiber bundle branch circuit four 1 sequentially pass through the collimating lens six 22 and the etalon two 27 and then are emitted to the beam combining mirror two 23, laser pulse signals incident from the single-mode fiber bundle branch circuit three 18 sequentially pass through the collimating lens five 19 and the reflector two 20 and then are emitted to the beam combining mirror two 23, the beam combining mirror two 23 is used for combining laser pulse signals incident from the etalon two 27 and the reflector two 20, the combined laser pulse signals are focused through the imaging lens two 24 and then are emitted to the fringe camera two 25, an image formed on the fringe camera two 25 has interference fringes, and the shock wave speed is calculated according to information such as the interference fringes.
Compared with an all-fiber VISAR, the whole optical path is slightly complex, but is much simpler than the original imaging VISAR optical path, and the debugging is more convenient. The advantages of the imaging type VISAR and the all-fiber VISAR are inherited, the optical path is simple to realize, the debugging is easy, the method is not limited by the space of a target range, and the method is suitable for diagnosis research of various shock wave loading experiments and research of a high-energy density physical state equation.
A shock wave velocity calculation method based on an optical fiber image transmission beam velocity interferometer comprises the following steps:
s1: emitting a short pulse probe laser with the wavelength of lambda from a light source 8 to the optical fiber image transmission beam speed interferometer, and recording the arrival time difference tau of two laser pulse signals emitted from a first interference module by using a first fringe camera 17 10 And the standing wave number variation value F of the interference fringe image 1 (t) recording the arrival time difference τ of the two laser pulse signals emitted from the interference module II by the fringe camera II 25 30 And the standing wave number variation value F of the interference fringe image 2 (t)；
S2: emitting a short pulse probe laser with the wavelength lambda from a light source 8 to the optical fiber image transmission beam speed interferometer, and emitting laser pulse signals from a single-mode optical fiber beam branch circuit I10 and a single-mode optical fiber beam branch circuit II 12 by using a fringe camera I17 to obtain a time difference of arrival tau 20 Recording the arrival time difference tau of the laser pulse signals emitted from the single-mode fiber bundle branch three 18 and the single-mode fiber bundle branch four 21 by using a fringe camera two 25 40 ；
S3: calculating to obtain the shock wave velocity u (t), and the specific steps comprise:
s31: the standing wave number change value F (t) of the laser pulse signal recorded by the fringe camera caused by difference frequency interference satisfies the following conditions:
in the formula (1), c is the speed of light, lambda is the wavelength of the probe laser, and tau 1 The time difference of arrival of two laser pulse signals emitted from the interference module is recorded by a fringe camera;
according to the formula of optical Doppler effect
Substituting the compound into formula (1) to obtain:
s32: arrival time difference tau of two laser pulse signals emitted from interference module 1 Satisfies the following conditions:
in the formula (3), n is refractive index of the optical fiber and etalon, l 1 Difference in fiber length of two single-mode fiber bundle branches for transmitting laser pulse signals to interference module 2 Is the difference in length of the two imaging paths of the interference module, h 1 Is the length of the etalon，
And (3) carrying out differential transformation on the formula to obtain:
s33: substituting the formula (3) and the formula (4) into the formula (2) to obtain:
s33: the laser pulse signal arrival time difference of two single-mode fiber bundle branches recorded by the fringe camera
Substituting the formula into the formula (5) to obtain:
s34: because one laser pulse signal is delayed by an etalon a ＝nh 1 And/c, substituting the equation into the equation (6) to obtain a calculation formula of the shock wave velocity u (t):
in the formula (7), the refractive index n and the refractive index dispersion value
Factory information of both optical fiber and etalon, etalon delay tau a The standing wave number variation F (t) is factory information of the etalon by reading an interference fringe image recorded by a fringe camera.
For stripe camera one 17, τ 1 ＝τ 10 ，τ 2 ＝τ 20 ，F(t)＝F 1 (t) etalon-delay τ a1 Then:
for streak cameras 25, t 1 ＝τ 30 ，τ 2 ＝τ 40 ，F(t)＝F 2 (t) etalon two delay τ a2 And then:
and (8) calculating formulas (8) and (9) to form double-precision shock wave speed detection.
Moreover, because the first etalon 26 and the second etalon 27 can be conveniently replaced, the sensitivity of the optical fiber image transmission beam velocity interferometer can be changed or selected very conveniently, and the dynamic range which can be measured after one-time installation and adjustment is enlarged.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (9)
1. A shock wave velocity calculation method of an optical fiber image transmission beam velocity interferometer is characterized by comprising the following steps:
s1: emitting a short pulse probe laser with wavelength lambda from a light source to an optical fiber image transmission beam speed interferometer, and recording the arrival time difference tau of two laser pulse signals emitted from an interference module by using a fringe camera 1 And a standing wave number variation value F (t) of the interference fringe image;
s2: emitting a short pulse probe laser with the wavelength of lambda from a light source to an optical fiber image transmission beam speed interferometer, and recording the arrival time difference tau of laser pulse signals emitted by two single-mode optical fiber beam branches corresponding to an interference module by using a fringe camera 2 ；
S3: calculating to obtain the shock wave velocity u (t), and the specific steps comprise:
s31: the standing wave number change value F (t) of the laser pulse signal recorded by the fringe camera due to difference frequency interference satisfies the following conditions:
in the formula (1), c is the speed of light, lambda is the wavelength of the probe laser, and tau 1 The time difference of arrival of two laser pulse signals emitted from the interference module is recorded by a fringe camera;
according to the formula of optical Doppler effect
Substituting the formula into the formula (1) to obtain:
s32: arrival time difference tau of two laser pulse signals emitted from interference module 1 Satisfies the following conditions:
in the formula (3), n is refractive index of the optical fiber and etalon, l 1 Difference in fiber length, l, of two single-mode fiber bundle branches for transmitting laser pulse signals to an interference module 2 Is the difference in length of the two imaging paths of the interference module, h 1 Is the length of the etalon and is,
and (4) performing differential transformation on the formula (3) to obtain:
s33: substituting the formula (3) and the formula (4) into the formula (2) to obtain:
s34: the arrival time difference of laser pulse signals emitted by two single-mode fiber bundle branches recorded by a fringe camera
Substituting the formula into the formula (5) to obtain: />
S35: one laser pulse signal is delayed by an etalon by a time tau a ＝nh 1 And/c, substituting the equation into equation (6) to obtain a calculation equation of the shock wave velocity u (t):
in the formula (7), the refractive index n and the refractive index dispersion value
Factory information of both optical fiber and etalon, etalon delay tau a Reading an interference fringe image recorded by a fringe camera for the standing wave number variation value F (t) as factory information of the etalon;
the optical fiber image transmission beam speed interferometer comprises an imaging module, an optical fiber image transmission beam, a first interference module and a second interference module;
the probe laser is focused on a target surface through the imaging module and reflects back a laser pulse signal, the laser pulse signal is imaged at the input end of the optical fiber image transmission beam through the imaging module, the laser pulse signal is divided into four parts through the optical fiber image transmission beam I, two laser pulse signals are imaged on the fringe camera I after passing through the interference module I, and the other two laser pulse signals are imaged on the fringe camera II after passing through the interference module II.
2. The method for calculating the velocity of a shock wave of an optical fiber image transmission beam velocity interferometer according to claim 1, wherein: the imaging module comprises a first collimating lens, a second collimating lens, a converging lens, a beam splitter and a light collecting lens;
the probe laser sequentially passes through the second collimating lens, the converging lens, the beam splitter, the first collimating lens and the light collecting lens, then is focused on a target surface and is reflected back to a laser pulse signal, and the laser pulse signal sequentially passes through the light collecting lens, the collimating lens and the beam splitter and then is imaged at the input end of the optical fiber image transmission beam.
3. The method for calculating the velocity of a shock wave of the optical fiber image transmission beam velocity interferometer according to claim 1 or 2, wherein: the optical fiber image transmission bundle comprises a single-mode optical fiber bundle trunk, and a single-mode optical fiber bundle branch I, a single-mode optical fiber bundle branch II, a single-mode optical fiber bundle branch III and a single-mode optical fiber bundle branch IV which are communicated with the single-mode optical fiber bundle trunk;
laser pulse signals reflected by the target surface are imaged at the input end of the single-mode fiber bundle trunk, laser pulse signals emitted by the single-mode fiber bundle branch I and the single-mode fiber bundle branch II are emitted into the interference module I, and laser pulse signals emitted by the single-mode fiber bundle branch III and the single-mode fiber bundle branch IV are emitted into the interference module II.
4. The method for calculating the velocity of a shock wave of an optical fiber image transmission beam velocity interferometer according to claim 3, wherein: the first interference module comprises a third collimating lens, a fourth collimating lens, a first etalon, a first reflecting mirror, a first beam combining mirror and a first imaging lens;
laser pulse signals incident from the single-mode fiber bundle branch circuit I sequentially pass through the collimating lens III and the etalon I and then are emitted to the beam combining mirror I, laser pulse signals incident from the single-mode fiber bundle branch circuit II sequentially pass through the collimating lens IV and the reflector I and then are emitted to the beam combining mirror I, the beam combining mirror combines laser pulse signals incident from the etalon I and the reflector I, and the combined laser pulse signals are emitted outwards through the imaging lens I.
5. The method for calculating the velocity of a shock wave of an optical fiber image transmission beam velocity interferometer according to claim 4, wherein: the second interference module comprises a fifth collimating lens, a sixth collimating lens, a second etalon, a second reflecting mirror, a second beam combining mirror and a second imaging lens;
laser pulse signals incident from the single-mode fiber bundle branch circuit IV sequentially pass through the collimating lens VI and the etalon II and then irradiate the laser pulse signals to the beam combining mirror II, laser pulse signals incident from the single-mode fiber bundle branch circuit III sequentially pass through the collimating lens V and the reflector II and then irradiate the laser pulse signals to the beam combining mirror II, the beam combining mirror two pairs of laser pulse signals incident from the etalon II and the reflector II are combined, and the combined laser pulse signals are emitted outwards through the imaging lens II.
6. The method for calculating the velocity of a shock wave of an optical fiber image transmission beam velocity interferometer according to claim 5, wherein: the length of the first etalon is larger than or smaller than that of the second etalon.
7. The method for calculating the velocity of a shock wave of an optical fiber image transmission beam velocity interferometer according to claim 3, wherein: the length of the single-mode optical fiber bundle branch I is larger than or smaller than that of the single-mode optical fiber bundle branch II.
8. The method for calculating the velocity of a shock wave of an optical fiber image transmission beam velocity interferometer according to claim 3, wherein: and the length of the third single-mode optical fiber bundle branch is greater than or less than that of the fourth single-mode optical fiber bundle branch.
9. The method for calculating the velocity of a shock wave of an optical fiber image transmission beam velocity interferometer according to claim 2, wherein: the imaging module further comprises a light barrier, the probe laser sequentially passes through a second collimating lens and a converging lens and then emits to the beam splitter, the beam splitter divides the probe laser into two beams, one beam of the probe laser emits to the first collimating lens, and the other beam of the probe laser emits to the light barrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710322726.0A CN107179132B (en) | 2017-05-09 | 2017-05-09 | Optical fiber image transmission beam velocity interferometer and shock wave velocity calculation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710322726.0A CN107179132B (en) | 2017-05-09 | 2017-05-09 | Optical fiber image transmission beam velocity interferometer and shock wave velocity calculation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107179132A CN107179132A (en) | 2017-09-19 |
| CN107179132B true CN107179132B (en) | 2023-04-14 |
Family
ID=59831440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710322726.0A Active CN107179132B (en) | 2017-05-09 | 2017-05-09 | Optical fiber image transmission beam velocity interferometer and shock wave velocity calculation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107179132B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806933B (en) * | 2017-12-08 | 2023-06-13 | 中国工程物理研究院激光聚变研究中心 | Device and method for measuring laser-induced shock wave velocity of optical material |
| CN108036863B (en) * | 2017-12-19 | 2023-08-25 | 中国工程物理研究院激光聚变研究中心 | Wide-range shock wave speed diagnosis device and measurement method |
| 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 |
| CN108871595B (en) * | 2018-07-27 | 2019-11-15 | 中国工程物理研究院激光聚变研究中心 | Super time resolution shock velocity calculation method |
| CN109884588B (en) * | 2019-01-16 | 2020-11-17 | 北京大学 | Distance measurement method and system for pulse sequence |
| CN110672263A (en) * | 2019-09-02 | 2020-01-10 | 南京理工大学 | Shock wave pressure sensor field calibration device and method |
| CN112215770B (en) * | 2020-10-10 | 2022-08-02 | 成都数之联科技股份有限公司 | Image processing method, system, device and medium |
| CN114111565B (en) * | 2021-11-25 | 2023-09-22 | 中国工程物理研究院激光聚变研究中心 | Multidirectional combined diagnosis speed interferometer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1089723A (en) * | 1993-06-16 | 1994-07-20 | 中国科学院上海光学精密机械研究所 | Multi-function laser interferometer |
| CN1959371A (en) * | 2006-09-16 | 2007-05-09 | 中国工程物理研究院流体物理研究所 | Full wave cross-sectional testing system |
| CN202330448U (en) * | 2011-11-25 | 2012-07-11 | 中国原子能科学研究院 | Imaging type laser speed interferometer system used for impulsion diagnosis |
| CN104048944A (en) * | 2014-03-14 | 2014-09-17 | 中国科学院力学研究所 | System and method for differential interferometric imaging |
| CN106547189A (en) * | 2016-11-25 | 2017-03-29 | 西安科技大学 | Reflective digital holographic microscopic imaging system and method based on pulse laser |
| CN206740252U (en) * | 2017-05-09 | 2017-12-12 | 中国工程物理研究院激光聚变研究中心 | Optical fiber image transmission beam velocity interferometer |
-
2017
- 2017-05-09 CN CN201710322726.0A patent/CN107179132B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1089723A (en) * | 1993-06-16 | 1994-07-20 | 中国科学院上海光学精密机械研究所 | Multi-function laser interferometer |
| CN1959371A (en) * | 2006-09-16 | 2007-05-09 | 中国工程物理研究院流体物理研究所 | Full wave cross-sectional testing system |
| CN202330448U (en) * | 2011-11-25 | 2012-07-11 | 中国原子能科学研究院 | Imaging type laser speed interferometer system used for impulsion diagnosis |
| CN104048944A (en) * | 2014-03-14 | 2014-09-17 | 中国科学院力学研究所 | System and method for differential interferometric imaging |
| CN106547189A (en) * | 2016-11-25 | 2017-03-29 | 西安科技大学 | Reflective digital holographic microscopic imaging system and method based on pulse laser |
| CN206740252U (en) * | 2017-05-09 | 2017-12-12 | 中国工程物理研究院激光聚变研究中心 | Optical fiber image transmission beam velocity interferometer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107179132A (en) | 2017-09-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107179132B (en) | Optical fiber image transmission beam velocity interferometer and shock wave velocity calculation method | |
| CN103616164B (en) | A kind of reflectivity based on pulsed laser light source/transmitance comprehensive measuring method | |
| KR100719892B1 (en) | Apparatus for measuring a differential mode delay of a multimode optical fiber | |
| CN101846745B (en) | Laser radar based on highly-correlated quantum imaging principle | |
| CN101634571B (en) | Optical pulse raster distributed fiber sensing device | |
| CN104764898B (en) | It is a kind of to realize two kinds of velocity measuring techniques to a measuring point while the device of repetition measurement using single probe monochromatic light road | |
| CN102519573A (en) | Remote non-contact vibration measuring device | |
| CN107144361B (en) | Multi-sensitivity arbitrary reflection surface velocity interferometer with consistent branch targets | |
| CN108873008A (en) | A kind of Underwater Range high-precision measuring method based on the interference of double light combs | |
| CN103760568B (en) | A kind of ultrahigh time resolution spatial phase shift surface imaging velocity interferometer | |
| CN104199044A (en) | Dual-mode superspeed moving object movement speed measurement device and method | |
| CN109798847A (en) | The measuring device and its test method of the measuring beam angle of divergence and the laser-quality factor | |
| CN102401691A (en) | All-fibre laser Doppler three-dimensional vibration meter | |
| CN101398294A (en) | Compact all optical fiber displacement interferometer | |
| CN105865754A (en) | Measuring device for length difference between arms of optical fiber interferometer | |
| CN108036863B (en) | Wide-range shock wave speed diagnosis device and measurement method | |
| CN206740252U (en) | Optical fiber image transmission beam velocity interferometer | |
| CN102252828B (en) | Method for monitoring real-time changes in reflectivity of highly reflective optical element under laser irradiation | |
| CN107941353A (en) | A kind of mensuration based on the associated coherence vortex topological charge of two-photon | |
| CN107064539A (en) | A kind of big visual field photon Doppler speed measuring device and method | |
| CN108431544A (en) | Equipment for measuring phase component parameters and fibre-optical dispersion and the method for measuring phase component parameters and fibre-optical dispersion | |
| CN113960631B (en) | Radar system | |
| CN108983253A (en) | A kind of high-precision laser microspur measurement method | |
| CN104729424B (en) | Confocal dot laser microscope and its scan method based on self-mixed interference | |
| CN115711633A (en) | Phase noise accurate correction optical frequency domain reflectometer of loop structure reference interferometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |