CN108593106B - System device for detecting stimulated Brillouin scattering transient ultrasonic grating spectrum - Google Patents
System device for detecting stimulated Brillouin scattering transient ultrasonic grating spectrum Download PDFInfo
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- CN108593106B CN108593106B CN201810356576.XA CN201810356576A CN108593106B CN 108593106 B CN108593106 B CN 108593106B CN 201810356576 A CN201810356576 A CN 201810356576A CN 108593106 B CN108593106 B CN 108593106B
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- 230000001052 transient effect Effects 0.000 title claims abstract description 31
- 238000001228 spectrum Methods 0.000 title claims abstract description 20
- 230000010287 polarization Effects 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 101000694017 Homo sapiens Sodium channel protein type 5 subunit alpha Proteins 0.000 claims abstract description 14
- 239000011521 glass Substances 0.000 claims abstract description 11
- 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 abstract description 8
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 17
- 238000009826 distribution Methods 0.000 claims description 10
- 108091006146 Channels Proteins 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000005304 optical glass Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- 238000002834 transmittance Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 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
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
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- 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
- G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
- G01J3/4412—Scattering spectrometry
Abstract
The invention provides a system device for detecting a stimulated Brillouin scattering transient ultrasonic grating spectrum. Including seed injection pulsed Nd, YAG laser, polarization beam splitter, wave plate, etc. The specific process of the system device is that pulse Nd is injected into seeds, a YAG laser emits a laser beam with the wavelength of 532nm, the laser beam passes through a polarization spectroscope which is highly transparent to horizontal light and highly reflective to vertical polarized light, the laser beam passes through an 1/4 wave plate and a convex lens and is focused into a temperature control glass water tank to generate backward stimulated Brillouin scattering spectrum, stimulated Brillouin scattering light passes through a 1/4 wave plate, a polarization spectroscope, a reflector, a concave lens, a convex lens and an F-P etalon in sequence and then enters an ICCD signal acquisition system, a time sequence control device of the ICCD is a pulse delay generator, and the signal is displayed on a computer after being processed and analyzed. The invention has the advantages that: the stimulated Brillouin scattering transient grating structure is detected more accurately to analyze a stimulated Brillouin scattering generation mechanism.
Description
Technical Field
The invention relates to a system device, in particular to a system device for detecting a stimulated Brillouin scattering transient ultrasonic grating spectrum.
Background
The invention is used as a detection system device, which mainly detects a transient ultrasonic grating structure when pump laser generates stimulated Brillouin scattering in water through a double-beam system. The invention has the idea that the stimulated Brillouin scattering has wide application prospect in the field of underwater detection and remote sensing, but the related reports of the action mechanism are not many, and many experimental results cannot be explained. At present, the physical mechanism research related to stimulated brillouin scattering basically analyzes and explains some basic rules by solving the numerical solution of a simplified nonlinear coupled wave equation set, and a corresponding detection method is lacked for the micro mechanism and structure existing in the scattering process. The invention adopts a double-beam detection system to analyze the stimulated Brillouin scattering in water, mainly detects the refractive index modulation distribution and the ultrasonic grating non-uniform distribution of the water after the stimulated Brillouin scattering is generated in the water, obtains the elastic strain distribution of a medium by utilizing devices such as a picosecond laser, an ultra-short pulse measuring instrument and the like through the light intensity distribution of the diffraction spectrum of a detection beam after passing through a transient ultrasonic grating, and then analyzes the structure and the refractive index distribution of the stimulated Brillouin scattering transient ultrasonic grating, and the detection result has potential application value for solving the problems of the detection depth and the detection precision of the current stimulated Brillouin scattering laser radar.
Disclosure of Invention
The invention aims to provide a system device for detecting a stimulated Brillouin scattering transient ultrasonic grating spectrum, which can more accurately detect a stimulated Brillouin scattering transient grating structure to analyze a stimulated Brillouin scattering generation mechanism.
The technical scheme adopted by the invention is as follows: a system device for detecting stimulated Brillouin scattering transient ultrasonic grating spectrum comprises a seed injection pulse Nd; YAG laser (01), polarization beam splitter (02), 1/4 wave plate (03), convex lens I (04), transient state ultrasonic grating (05), temperature control glass water tank (06), ultrashort pulse measuring instrument (07), reflector I (08), concave lens I (09), convex lens II (10), F-P etalon (11), ICCD (12), pulse delay generator (13), computer (14), picosecond laser (15), concave lens II (16), convex lens III (17) and reflector II (18); the method is characterized in that: the specific process of the system device is seed injection pulse Nd; YAG laser (01) emits laser beam with wavelength of 532nm, the laser beam passes through a polarization spectroscope (02), the polarization spectroscope is highly transparent to horizontal light and highly reflective to vertical polarized light, the laser beam passes through a 1/4 wave plate (03) and a convex lens I (04) and is focused into a temperature control glass water tank (06) to generate backward stimulated Brillouin scattering spectrum, stimulated Brillouin scattering light passes through a 1/4 wave plate (03), the polarization spectroscope (02), a reflector I (08), a concave lens I (09), a convex lens II (10) and an F-P etalon (11) in sequence and then enters an ICCD signal acquisition system (12), a time sequence control device of the ICCD is a pulse delay generator (13), and the signal is displayed on a computer (14) after being processed and analyzed; the other light path is that a picosecond laser (15) emits a detection light beam with the wavelength of 532nm, the detection light beam is collimated by a concave lens II (16) and a convex lens III (17), the detection light beam is reflected to the position of the transient ultrasonic grating (05) by a reflecting mirror II (18) through a Bragg angle, and the generated diffraction light is collected by an ultrashort pulse measuring instrument (07). The elastic strain distribution of the medium is obtained through the light intensity distribution of the diffraction spectrum of the detection light beam after passing through the transient ultrasonic grating, so that the structure and the refractive index distribution of the stimulated Brillouin scattering transient ultrasonic grating are analyzed.
The light beam emitted by the picosecond laser (15) is incident into the stimulated Brillouin scattering transient ultrasonic grating (05) at a Bragg angle.
Seed injection pulse Nd is adopted; YAG laser (01), polarization beam splitter (02), 1/4 wave plate (03), convex lens I (04), transient state ultrasonic grating (05), temperature control glass water tank (06), ultrashort pulse measuring instrument (07), reflector I (08), concave lens I (09), convex lens II (10), F-P etalon (11), ICCD (12), pulse delay generator (13), computer (14), picosecond laser (15), concave lens II (16), convex lens III (17) and reflector II (18).
The temperature range of the temperature control glass water tank (06) is 0-40 ℃, the temperature precision is 0.1 ℃, and high-transmittance K9 type optical glass is adopted.
Injecting a pulse Nd into the seed; YAG laser (01), repetition frequency: 10HZ, pulse width: 8ns, single pulse energy: 4J/pulse, line width: 90 MHz; picosecond laser (15), wavelength: 1064/532/355nm, pulse width: 30ps, repetition frequency: 10Hz, output energy: the outgoing beam wavelength was 80 mJ/pulse at 1064nm, 40 mJ/pulse at 532nm, and 24 mJ/pulse at 355 nm.
ICCD (12), narrowest gate width: 2ns, pixel size: 12 μm, number of pixels: 1024x1024, transmission rate: 5MHz, sensitivity: 4-300 ADU/photon; the pulse delay generator (13) is 4 channels, and the time delay is as follows: adjustable in 0-1000 seconds, and precision: 2ps, rising edge: 5 ps.
The invention has the advantages that: the stimulated Brillouin scattering transient grating structure is detected more accurately to analyze a stimulated Brillouin scattering generation mechanism.
Drawings
FIG. 1 is a system block diagram of the present invention.
FIG. 1 shows: injecting a pulse Nd into the seed; YAG laser (01), polarization beam splitter (02), 1/4 wave plate (03), convex lens I (04), transient state ultrasonic grating (05), temperature control glass water tank (06), ultrashort pulse measuring instrument (07), reflector I (08), concave lens I (09), convex lens II (10), F-P etalon (11), ICCD (12), pulse delay generator (13), computer (14), picosecond laser (15), concave lens II (16), convex lens III (17) and reflector II (18).
Detailed Description
①, injecting pulse Nd into the YAG laser (01) emitting a laser beam with a wavelength of 532nm, passing through a polarization spectroscope (02) which highly transmits horizontal light and highly reflects vertical polarized light, passing through a 1/4 wave plate (03) and a convex lens (04), entering a temperature control glass water tank (06), focusing to generate a backward stimulated Brillouin scattering spectrum, sequentially passing through a 1/4 wave plate (03), the polarization spectroscope (02), a reflector I (08), a concave lens I (09), a convex lens II (10) and an F-P etalon (11), entering an ICCD signal acquisition system (12), processing and analyzing signals and displaying on a computer (14), emitting a detection beam with a wavelength of 532nm by a picosecond laser (15), collimating by a concave lens II (16) and a convex lens III (17), reflecting the detection beam to a transient ultrasonic grating position by the reflector II (18) through a Bragg angle, and collecting the generated diffraction light by an ultrashort pulse measuring instrument (07).
② the invention relates to a system device for detecting stimulated Brillouin scattering transient state ultrasonic grating spectrum, which is characterized in that the temperature range of a temperature control glass water tank (06) is 0-40 ℃, the temperature precision is 0.1 ℃, and high-transmittance K9 type optical glass is adopted.
③ the invention relates to a system device for detecting stimulated Brillouin scattering transient state ultrasonic grating spectrum, which is characterized in that the system device comprises a seed injection pulse Nd, a YAG laser (01) with repetition frequency of 10HZ, pulse width of 8ns, single pulse energy of 4J/pulse and line width of 90MHz, a picosecond laser (15) with wavelength of 1064/532/355nm, pulse width of 30ps and repetition frequency of 10Hz, and output energy of 80 mJ/pulse when the wavelength of emergent beam is 1064nm, 40 mJ/pulse when 532nm and 24 mJ/pulse when 355 nm.
④ the invention relates to a system device for detecting stimulated Brillouin scattering transient state ultrasonic grating spectrum, which is characterized in that ICCD (12) has the narrowest gate width of 2ns, the pixel size of 12 μm, the pixel number of 1024x1024, the transmission rate of 5MHz and the sensitivity of 4-300 ADU/photon, a pulse delay generator (13) with 4 channels, the time delay of 0-1000 seconds is adjustable, the precision of 2ps and the rising edge of 5 ps.
Claims (4)
1. A system device for detecting stimulated Brillouin scattering transient ultrasonic grating spectrum comprises a seed injection pulse Nd; YAG laser (01), polarization beam splitter (02), 1/4 wave plate (03), convex lens I (04), transient state ultrasonic grating (05), temperature control glass water tank (06), ultrashort pulse measuring instrument (07), reflector I (08), concave lens I (09), convex lens II (10), F-P etalon (11), ICCD (12), pulse delay generator (13), computer (14), picosecond laser (15), concave lens II (16), convex lens III (17) and reflector II (18); the method is characterized in that: the specific process of the system device is seed injection pulse Nd; YAG laser (01) emits laser beam with wavelength of 532nm, the laser beam passes through a polarization spectroscope (02), the polarization spectroscope is highly transparent to horizontal light and highly reflective to vertical polarized light, the laser beam passes through a 1/4 wave plate (03) and a convex lens I (04) and is focused into a temperature control glass water tank (06) to generate backward stimulated Brillouin scattering spectrum, stimulated Brillouin scattering light passes through a 1/4 wave plate (03), the polarization spectroscope (02), a reflector I (08), a concave lens I (09), a convex lens II (10) and an F-P etalon (11) in sequence and then enters an ICCD signal acquisition system (12), a time sequence control device of the ICCD is a pulse delay generator (13), and the signal is displayed on a computer (14) after being processed and analyzed; the other light path is that a picosecond laser (15) emits a detection light beam with the wavelength of 532nm, the detection light beam is collimated by a concave lens II (16) and a convex lens III (17), and then is reflected to the position of a transient ultrasonic grating (05) by a reflecting mirror II (18) through a Bragg angle, and the generated diffraction light is collected by an ultrashort pulse measuring instrument (07); the elastic strain distribution of the medium is obtained through the light intensity distribution of the diffraction spectrum of the detection light beam after passing through the transient ultrasonic grating, so that the structure and the refractive index distribution of the stimulated Brillouin scattering transient ultrasonic grating are analyzed.
2. The system device for detecting the stimulated brillouin scattering transient state ultrasonic grating spectrum according to claim 1, wherein: the temperature range of the temperature control glass water tank (06) is 0-40 ℃, the temperature precision is 0.1 ℃, and high-transmittance K9 type optical glass is adopted.
3. The system device for detecting the stimulated brillouin scattering transient state ultrasonic grating spectrum according to claim 1, wherein: injecting a pulse Nd into the seed; YAG laser (01), repetition frequency: 10HZ, pulse width: 8ns, single pulse energy: 4J/pulse, line width: 90 MHz; picosecond laser (15), wavelength: 1064/532/355nm, pulse width: 30ps, repetition frequency: 10Hz, output energy: the outgoing beam wavelength was 80 mJ/pulse at 1064nm, 40 mJ/pulse at 532nm, and 24 mJ/pulse at 355 nm.
4. The system device for detecting the stimulated brillouin scattering transient state ultrasonic grating spectrum according to claim 1, wherein: ICCD (12), narrowest gate width: 2ns, pixel size: 12 μm, number of pixels: 1024x1024, transmission rate: 5MHz, sensitivity: 4-300 ADU/photon; the pulse delay generator (13) is 4 channels, and the time delay is as follows: adjustable in 0-1000 seconds, and precision: 2ps, rising edge: 5 ps.
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| CN109443698B (en) * | 2018-10-12 | 2020-09-11 | 南昌航空大学 | System device for directly imaging stimulated Brillouin scattering transient grating structure |
| CN109459415B (en) * | 2018-11-30 | 2021-06-15 | 中国工程物理研究院流体物理研究所 | Laser transient grating system with continuously adjustable space period |
| CN109799192A (en) * | 2019-01-18 | 2019-05-24 | 广东工业大学 | A kind of non-contact laser ultrasonic nondestructive testing and method for arbitrary surface |
| CN110672566A (en) * | 2019-10-18 | 2020-01-10 | 南昌航空大学 | Method for detecting stimulated Brillouin scattering acoustic photonic crystal structure in water |
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| KR20130104127A (en) * | 2012-03-13 | 2013-09-25 | 한국철도기술연구원 | Optical fiber sensor system based brillouin scattering, strain and temperature measuring method using the same |
| CN106442414A (en) * | 2016-11-23 | 2017-02-22 | 南昌航空大学 | Device for conducting fast detection on water body petroleum pollutants based on Brillouin-Raman spectra and method thereof |
| CN107764741A (en) * | 2017-09-28 | 2018-03-06 | 南昌航空大学 | A kind of detection means for integrating stimulated Brillouin scattering and optical coherence elastogram |
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| ITBO20130142A1 (en) * | 2013-03-29 | 2014-09-30 | Filippo Bastianini | QUESTIONER FOR FIBER OPTIC DISTRIBUTED SENSORS FOR STIMULATED BRILLOUIN EFFECT USING A QUICKLY TUNING BRACELET RING LASER |
| WO2015170355A1 (en) * | 2014-05-05 | 2015-11-12 | Filippo Bastianini | Apparatus for interrogating distributed optical fibre sensors using a stimulated brillouin scattering optical frequency-domain interferometer |
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| KR20130104127A (en) * | 2012-03-13 | 2013-09-25 | 한국철도기술연구원 | Optical fiber sensor system based brillouin scattering, strain and temperature measuring method using the same |
| CN106442414A (en) * | 2016-11-23 | 2017-02-22 | 南昌航空大学 | Device for conducting fast detection on water body petroleum pollutants based on Brillouin-Raman spectra and method thereof |
| CN107764741A (en) * | 2017-09-28 | 2018-03-06 | 南昌航空大学 | A kind of detection means for integrating stimulated Brillouin scattering and optical coherence elastogram |
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