CN107290063A - A kind of ocean temperature measuring method and system - Google Patents
A kind of ocean temperature measuring method and system Download PDFInfo
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- CN107290063A CN107290063A CN201710522997.0A CN201710522997A CN107290063A CN 107290063 A CN107290063 A CN 107290063A CN 201710522997 A CN201710522997 A CN 201710522997A CN 107290063 A CN107290063 A CN 107290063A
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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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0037—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the heat emitted by liquids
Abstract
The invention discloses a kind of ocean temperature measuring method and system, it is related to ocean temperature remote sensing technology field.This method comprises the following steps：Laser is divided into relevant local oscillator light and detection light, and detection light is focused on into designated depth waters；Backward Rayleigh Brillouin scattering is received from designated depth waters；Backward Rayleigh Brillouin scattering and local oscillator light are mixed and by exporting intermediate-freuqncy signal after opto-electronic conversion；Brillouin shift is extracted from intermediate-freuqncy signal, the ocean temperature for obtaining designated depth waters is calculated according to ocean temperature inverse model.The present invention can quickly and accurately obtain Brillouin shift and underwater vertical Temperature Distribution, with the characteristics of cost is low, measurement is easy, real-time is good, noise immunity is good.
Description
Technical field
The present invention relates to ocean temperature remote sensing technology field, a kind of ocean temperature measuring method and system are specifically related to.
Background technology
Brillouin scattering is the inelastic scattering of a kind of photon and medium interaction, when Brillouin scattering occurs, light
Son can annex a phonon by collision increases self-energy, or one phonon of loss self-energy and then generation.It is this to touch
The change of scattering light frequency can be caused by hitting the acousto-optic energy exchange of generation.On frequency spectrum, the change of this light frequency is presented as cloth
In deep scattering peak be divided into Stokes peak and anti-Stokes peak, the both sides for being distributed in laser center frequency of its positional symmetry,
And certain skew is there occurs relative to laser center frequency.The offset is named as Brillouin shift.Brillouin scattering
Energy of this spectrum distribution with acoustical phonon in itself is relevant, can be connected with insulating particles free path etc..Work as Brillouin
When scattering occurs, the not insulating particles interacted with photon, but the density fluctuation of medium, the density of this medium
Fluctuation and the physical attribute of medium, such as temperature have relation.Thus, Brillouin spectrum can reflect that the physics of medium is special
Property, such as velocity of sound, temperature etc..And as spectrum signature parameter Brillouin shift due to the physical characteristic with medium be related and gradually
The physical characteristic of medium is commonly used by people for studying and measures, for example, the Brillouin scattering based on laser is widely used in point
The fields such as cloth optical fiber temperature sensor, ocean temperature remote sensing, for being measured to environmental physicses parameter.
In ocean temperature remote sensing application, the Brillouin scattering spectrum that the laser radar system based on Brillouin scattering is used
E measurement technology mainly has following 2 class：Edge detecting technique and F-P Fabry-Perots (Fabry-P é rot) scanning interferometer skill
Art, wherein, the cost of edge detecting technique is higher, and the sweep time of F-P scanning interferometers is longer, and both technologies are in reality
It is rather limited in.
The content of the invention
For defect present in prior art, it is a primary object of the present invention to provide a kind of ocean temperature measurement side
Method, another object of the present invention is to provide a kind of measurement system for sea water temperature, can quickly and accurately obtain Brillouin
Frequency displacement and underwater vertical Temperature Distribution, with the characteristics of cost is low, measurement is easy, real-time is good, noise immunity is good.
The present invention provides a kind of ocean temperature measuring method, comprises the following steps：
Laser is divided into relevant local oscillator light and detection light, and detection light is focused on into designated depth waters；
Backward Rayleigh Brillouin scattering is received from designated depth waters；
Backward Rayleigh Brillouin scattering and local oscillator light are mixed and by exporting intermediate-freuqncy signal after opto-electronic conversion；
Brillouin shift is extracted from intermediate-freuqncy signal, is calculated according to ocean temperature inverse model and obtains designated depth waters
Ocean temperature.
On the basis of above-mentioned technical proposal, backward Rayleigh Brillouin scattering and local oscillator light are mixed and by light
Output intermediate-freuqncy signal includes after electricity conversion：Backward Rayleigh Brillouin scattering and local oscillator light are mixed using balance heterodyne approach
Frequency simultaneously generates intermediate-freuqncy signal.
On the basis of above-mentioned technical proposal, the frequency range of the intermediate-freuqncy signal is 7GHz-8GHz.
On the basis of above-mentioned technical proposal, the laser is pulse laser.
On the basis of above-mentioned technical proposal, extraction Brillouin shift includes from data signal：
Data signal is subjected to fast Fourier FFT, and pulse echo power spectrum is obtained using period map method；
Multiple pulse echo power spectrum are carried out with the cumulative cumulative power that obtains to compose；
Calculated using Nonlinear Quasi hop algorithm from cumulative power spectrum and obtain Brillouin shift.
On the basis of above-mentioned technical proposal, the ocean temperature inverse model is：
T(S,νB)=a0+a1(νB-7.5)+a2(νB-7.5)2+a3(νB-7.5)3+a4(νB-7.5)6+
S[a5+a6(νB-7.5)+a7(νB-7.5)2+a8(νB-7.5)3]
Wherein, T is temperature, aiFor constant, i=1,2 ... ..., 8, νBFor Brillouin shift, S is the salinity in seawater.
The present invention also provides a kind of measurement system for sea water temperature, including：
Laser emission element, it is used to produce laser, laser is divided into relevant local oscillator light and detection light, and will detect light
Focus on designated depth waters；
Light receiving unit, it is used to receive backward Rayleigh Brillouin scattering from designated depth waters；
Photoelectric conversion unit, it is used to be mixed backward Rayleigh Brillouin scattering and local oscillator light and by photoelectricity turn
Intermediate-freuqncy signal is exported after changing；
Data processing unit, it is used to from intermediate-freuqncy signal extract Brillouin shift, and according to ocean temperature inverse model
Calculate the ocean temperature for obtaining designated depth waters.
On the basis of above-mentioned technical proposal, the laser emission element includes laser, beam splitter, Beam Control and whole
Shape device, laser is used to produce laser, and beam splitter is used to laser being divided into local oscillator light and detection light, and Beam Control and reshaper are used
Designated depth waters is focused in light will be detected.
On the basis of above-mentioned technical proposal, the photoelectric conversion unit includes：
Balanced detector, it is used to receive local oscillator light and backward Rayleigh Brillouin scattering respectively, in backward Rayleigh cloth
Deep scattered light is mixed and by exporting intermediate-freuqncy signal after opto-electronic conversion with local oscillator light；
Amplifier, it is used to be amplified the intermediate-freuqncy signal；
Capture card, it is used to carry out digital sample to the intermediate-freuqncy signal after amplification.
On the basis of above-mentioned technical proposal, the ocean temperature inverse model is：
T(S,νB)=a0+a1(νB-7.5)+a2(νB-7.5)2+a3(νB-7.5)3+a4(νB-7.5)6+
S[a5+a6(νB-7.5)+a7(νB-7.5)2+a8(νB-7.5)3]
Wherein, T is temperature, aiFor constant, i=1,2 ... ..., 8, νBFor Brillouin shift, S is the salinity in seawater.
Compared with prior art, advantages of the present invention is as follows：
(1) the different local oscillator light of frequency and backward Rayleigh Brillouin scattering optical superposition are generated into intermediate-freuqncy signal, based on light outside
Poor probe method, i.e., using light coherent superposition principle (frequency spectrum detection), so that the measurement to Brillouin shift is realized, with classical signal
Receiving processing system is compared, and ocean temperature of embodiment of the present invention measuring method and system quickly and can be obtained accurately in cloth
Deep frequency displacement and underwater vertical Temperature Distribution, with the characteristics of cost is low, measurement is easy, real-time is good, noise immunity is good.
(2) influence of the shot noise to heterodyne detection signal to noise ratio in local oscillator light can be overcome using balance heterodyne approach,
The signal to noise ratio of intermediate-freuqncy signal is improved, noise immunity is further increased.
(3) because seawater channel is accidental channel, the backward Rayleigh brillouin scattering signal of acquisition has stronger fluctuating, to many
Individual pulse echo power spectrum, which add up, further to improve signal to noise ratio with noise reduction.
Brief description of the drawings
Fig. 1 is ocean temperature measuring method flow chart of the embodiment of the present invention；
Fig. 2 is measurement system for sea water temperature schematic diagram of the embodiment of the present invention.
Embodiment
The present invention is based on laser heterodyne technique, is divided into detection light and local oscillator light after beam splitter beam splitting using pulse laser,
Detect after light expands pack shaping through optics and produce scattering in designated depth waters, backward Rayleigh Brillouin scattering connects through telescope
Balanced detector and local oscillator photomixing are imported after receipts.Based on optical heterodyne detection method, i.e., using light coherent superposition principle, by frequency not
Same local oscillator light and backward Rayleigh Brillouin scattering optical superposition, will be used as the backward Rayleigh Brillouin scattering of high frequency lightwave signal
Intermediate frequency envelope signal is converted to, the differential signal after mixing, which enters low-noise amplifier, to carry out electricity amplification to ensure differential signal
Dynamic range, modulus AD samplings are then carried out by capture card and computer is delivered to carrying out follow-up data processing to realize pair
The measurement of Brillouin shift and temperature retrieval.
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of ocean temperature measuring method, comprises the following steps：
S1. laser is divided into relevant local oscillator light and detection light, and detection light is focused on into designated depth waters.Laser is passed through
It is divided into 2 road light after optical beam-splitter, incides designated depth as detection light by Beam Control and after expanding pack shaping all the way
Waters, to detect the temperature information in the waters；Another road is as local oscillator light, with the backward Rayleigh received from designated depth waters
Brillouin scattering is mixed.Laser preferred center wavelength is 532nm pulse laser.
S2. backward Rayleigh Brillouin scattering is received from designated depth waters.
S3. backward Rayleigh Brillouin scattering and local oscillator light are mixed and believed by exporting intermediate frequency after opto-electronic conversion
Number.
Specifically, being mixed and backward Rayleigh Brillouin scattering and local oscillator light by exporting intermediate frequency after opto-electronic conversion
Signal includes：Backward Rayleigh Brillouin scattering and local oscillator light are mixed using balance heterodyne approach and intermediate frequency is generated and is believed
Number.The core devices for balancing heterodyne method are balanced detector.Two paths built in balanced detector, are connect completely using two characteristics
Near photodiode carries out opto-electronic conversion, backward Rayleigh Brillouin scattering and the optical signal exported after local oscillator photomixing respectively
The two paths are respectively enterd, wherein adding delay line all the way, or Mach-Zehnder interferometer are used, the phase of adjustment all the way is anti-
Partially, rear end uses difference amplifier, amplifies difference mode signal, suppression common mode signal.After the output signal of two paths is merged, make an uproar
Sound is offseted completely, and only the difference signal of the two is exported by significantly amplification, therefore with good opto-electronic conversion amplification characteristic.
The frequency range of intermediate-freuqncy signal is 7GHz-8GHz.
Influence of the shot noise to heterodyne detection signal to noise ratio in local oscillator light can be overcome using balance heterodyne approach, improved
The signal to noise ratio of intermediate-freuqncy signal, further increases noise immunity.
S4. Brillouin shift is extracted from data signal, is calculated according to ocean temperature inverse model and obtains designated depth water
The ocean temperature in domain.
In step S4, extraction Brillouin shift includes from data signal：
Data signal is carried out fast Fourier FFT by S4.1, and obtains pulse echo power spectrum using period map method；
S4.2 carries out the cumulative cumulative power that obtains to multiple pulse echo power spectrum and composed；
S4.3 is calculated from cumulative power spectrum using Levenberg-Marquardt Nonlinear Quasis hop algorithm and is obtained Brillouin
Frequency displacement.
Because seawater channel is accidental channel, the backward Rayleigh brillouin scattering signal of acquisition has stronger fluctuating, to multiple
Pulse echo power spectrum, which add up, further to improve signal to noise ratio with noise reduction.
Ocean temperature inverse model is：
T(S,νB)=a0+a1(νB-7.5)+a2(νB-7.5)2+a3(νB-7.5)3+a4(νB-7.5)6+
S[a5+a6(νB-7.5)+a7(νB-7.5)2+a8(νB-7.5)3]
Wherein, T is temperature, aiFor constant, i is positive integer, νBFor Brillouin shift, S is the salinity in seawater, is taken here
35 ‰ (the average salinity in world ocean).
It should be noted that the ocean temperature inverse model is not only relevant with Brillouin shift, and with the salinity S in seawater
It is relevant.When carrying out inverting with the model, salinity S is handled as known quantity 35 ‰ (the average salinity in world ocean)
's.
aiIt is shown in Table 1：
Table 1：Constant ai
| ai | |
| I=0 | 23.5 |
| I=1 | 65.5 |
| I=2 | 75 |
| I=3 | 252 |
| I=4 | 1100 |
| I=5 | -0.402 |
| I=6 | -0.287 |
| I=7 | -0.902 |
| I=8 | -5.5 |
By the different local oscillator light of frequency and backward Rayleigh Brillouin scattering optical superposition generation intermediate-freuqncy signal, visited based on optical heterodyne
Survey method, i.e., using light coherent superposition principle (frequency spectrum detection), so as to realize the measurement to Brillouin shift, receive with classical signal
Processing system is compared, and ocean temperature of embodiment of the present invention measuring method and system can quickly and accurately obtain brillouin frequency
Move and underwater vertical Temperature Distribution, with the characteristics of cost is low, measurement is easy, real-time is good, noise immunity is good.
Shown in Figure 2, the embodiment of the present invention also provides a kind of measurement system for sea water temperature, and this measuring system includes laser
Transmitter unit 1, light receiving unit 2, photoelectric conversion unit 3 and data processing unit 4.
Laser emission element 1 is used to produce laser, and what is be preferred to use in the present invention is pulse laser, and pulse laser relatively connects
Continuous laser has stronger energy, can penetrate deeper seawater, and laser is divided into relevant local oscillator light and detection light, and will detection
Light focuses on designated depth waters.Specifically, laser emission element 1 includes laser 11, beam splitter 12, Beam Control and shaping
Device 13, laser 11 is used to produce laser, and beam splitter 12 is used to laser being divided into local oscillator light and detection light, Beam Control and shaping
Device 13 is used for the waters that detection light is focused on to designated depth.
LASER Light Source occupies very important status as the offer equipment of optical energy in a whole set of measuring system.It is right
For Yu Haiyang remote sensing, because laser radar belongs to active remote sensing equipment, performance of the optical maser wavelength for a whole set of laser radar
There is very important effect, because seawater has different absorptivities for the light of different-waveband.Select the laser of suitable wavelength
Device is not only able to power and cost needed for being effectively reduced laser, moreover it is possible to effectively improve laser and seawater is worn as light source
Permeability, increases remote sensing depth.On the optical absorption spectral line of seawater, there is a transmission in 480nm to 580nm bluish-green optical band
Window, seawater is minimum to the absorptivity in the wave-length coverage.If optical maser wavelength selection is in this wave band, its attenuation coefficient will
0.01 can be less than, and its attenuation length can also reach more than 100 meters.To meet investigation depth demand, this measuring system is preferably adopted
The pulse laser for being 532nm with centre wavelength, compared with even laser, pulse laser has bigger energy, can penetrate deeper
Seawater.The single pulse energy of this other pulse laser is 650mJ, and pulse recurrence frequency is 10Hz, and minimum pulse width is about
2ns。
Beam Control and reshaper 13 can include Beam Control module and expand pack Shaping Module, Beam Control module by
A series of optical lens group compositions, for controlling detection light.The expansion pack Shaping Module that is connected with Beam Control module it is main by
Extender lens and condenser lens composition, for detection light to be focused on into designated depth waters.The pulse laser quilt that laser is produced
Beam splitter is divided into after monochromatic, relevant detection light and local oscillator light, and detection light is first expanded again through Beam Control module and beam expanding lens
Line focus lens focus is to designated depth waters, the ocean temperature for detecting the depth.
Light receiving unit 2 is used to receive backward Rayleigh Brillouin scattering from designated depth waters.Light receiving unit 2 is main
It is made up of telescope 21 and optical lens group 22, telescope 21 is used for the backward Rayleigh Brillouin scattering for receiving designated depth waters
Light, is then adjusted after light path carries out Beam Control and shaping by a series of optical lens groups 22 and is directed into photoelectric conversion unit 3.
Photoelectric conversion unit 3 is used to be mixed and by opto-electronic conversion backward Rayleigh Brillouin scattering and local oscillator light
After export intermediate-freuqncy signal, photoelectric conversion unit 3 is the core of this measuring system, and photoelectric conversion unit 3 includes balance detection
Device 31, amplifier 32 and capture card 33.
Balanced detector 31 is used to receive local oscillator light and backward Rayleigh Brillouin scattering respectively, to backward Rayleigh Brillouin
Scattered light is mixed with local oscillator light and by exporting intermediate-freuqncy signal (electric signal) after opto-electronic conversion, required for intermediate-freuqncy signal is
The Brillouin shift of measurement.Photodetector is one of Primary Component of laser pick-off, according to optical heterodyne detection technology, if this
The light that shakes contains shot noise, then the intermediate-freuqncy signal signal to noise ratio reduction exported, in order to overcome the influence of local oscillator light shot noise, generally
The balanced detector used using balanced type heterodyne technology, i.e. this measuring system.Two paths built in photodetector are balanced,
Opto-electronic conversion, backward Rayleigh Brillouin scattering and local oscillator light are carried out respectively using two characteristics close photodiode completely
The optical signal exported after mixing respectively enters the two paths, wherein add delay line all the way, or uses Mach-Zehnder interferometer,
The phase of adjustment all the way is reverse-biased, and rear end uses difference amplifier, amplifies difference mode signal, suppression common mode signal.By two paths
After output signal merges, noise is offseted completely, and only the difference signal of the two is exported by significantly amplification, therefore is had well
Opto-electronic conversion amplification characteristic.In addition, the backward Rayleigh Brillouin scattering of high frequency is converted into compared with low frequency by balanced detector 31
Intermediate-freuqncy signal, facilitates capture card 33 to carry out digital data samples.
Amplifier 32 is used to be amplified intermediate-freuqncy signal, and amplifier 32 is preferred to use low-noise amplifier, and low noise is put
The intermediate-freuqncy signal that big device is exported to balanced detector 31 carries out electricity amplification, it is ensured that the dynamic range of intermediate-freuqncy signal.
Capture card 33 does rear end for carrying out digital sample to the intermediate-freuqncy signal after amplification, and issuing data processing unit 4
Data processing, capture card 33 can be modulus A/D chip.
Data processing unit 4 is used to extract Brillouin shift from intermediate-freuqncy signal, and according to ocean temperature inverse model meter
Calculate the ocean temperature for obtaining designated depth waters.Data processing unit 4 is mainly made up of computer, and photoelectric conversion system 3 is adopted
The digital data transmission that truck 33 is exported carries out power Spectral Estimation into computer and calculates Brillouin shift, in conjunction with sea water temperature
Spend inverse model and carry out temperature computation.
Ocean temperature inverse model is：
T(S,νB)=a0+a1(νB-7.5)+a2(νB-7.5)2+a3(νB-7.5)3+a4(νB-7.5)6+
S[a5+a6(νB-7.5)+a7(νB-7.5)2+a8(νB-7.5)3]
Wherein, T is temperature, aiFor constant, i=1,2 ... ..., 8, νBFor Brillouin shift, S is the salinity in seawater, this
In take 35 ‰ (the average salinity in world ocean).
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (10)
1. a kind of ocean temperature measuring method, it is characterised in that comprise the following steps：
Laser is divided into relevant local oscillator light and detection light, and detection light is focused on into designated depth waters；
Backward Rayleigh Brillouin scattering is received from designated depth waters；
Backward Rayleigh Brillouin scattering and local oscillator light are mixed and by exporting intermediate-freuqncy signal after opto-electronic conversion；
Brillouin shift is extracted from intermediate-freuqncy signal, the seawater for obtaining designated depth waters is calculated according to ocean temperature inverse model
Temperature.
2. ocean temperature measuring method as claimed in claim 1, it is characterised in that to backward Rayleigh Brillouin scattering and this
The light that shakes is mixed and included by exporting intermediate-freuqncy signal after opto-electronic conversion：Using balance heterodyne approach to backward Rayleigh Brillouin
Scattered light is mixed with local oscillator light and generates intermediate-freuqncy signal.
3. ocean temperature measuring method as claimed in claim 2, it is characterised in that：The frequency range of the intermediate-freuqncy signal is
7GHz-8GHz。
4. ocean temperature measuring method as claimed in claim 1, it is characterised in that：The laser is pulse laser.
5. ocean temperature measuring method as claimed in claim 4, it is characterised in that Brillouin shift is extracted from data signal
Including：
Data signal is subjected to fast Fourier FFT, and pulse echo power spectrum is obtained using period map method；
Multiple pulse echo power spectrum are carried out with the cumulative cumulative power that obtains to compose；
Calculated using Nonlinear Quasi hop algorithm from cumulative power spectrum and obtain Brillouin shift.
6. ocean temperature measuring method as claimed in claim 1, it is characterised in that the ocean temperature inverse model is：
T(S,νB)=a0+a1(νB-7.5)+a2(νB-7.5)2+a3(νB-7.5)3+a4(νB-7.5)6+
S[a5+a6(νB-7.5)+a7(νB-7.5)2+a8(νB-7.5)3]
Wherein, T is temperature, aiFor constant, i=1,2 ... ..., 8, νBFor Brillouin shift, S is the salinity in seawater.
7. a kind of measurement system for sea water temperature, it is characterised in that including：
Laser emission element, it is used to produce laser, laser is divided into relevant local oscillator light and detection light, and detection light is focused on
To designated depth waters；
Light receiving unit, it is used to receive backward Rayleigh Brillouin scattering from designated depth waters；
Photoelectric conversion unit, its be used to be mixed backward Rayleigh Brillouin scattering and local oscillator light and by opto-electronic conversion after
Export intermediate-freuqncy signal；
Data processing unit, it is used to from intermediate-freuqncy signal extract Brillouin shift, and is calculated according to ocean temperature inverse model
Obtain the ocean temperature in designated depth waters.
8. measurement system for sea water temperature as claimed in claim 7, it is characterised in that：The laser emission element includes laser
Device, beam splitter, Beam Control and reshaper, laser are used to produce laser, and beam splitter is used to laser being divided into local oscillator light and spy
Light-metering, Beam Control and reshaper are used to detection light focusing on designated depth waters.
9. measurement system for sea water temperature as claimed in claim 7, it is characterised in that：The photoelectric conversion unit includes：
Balanced detector, it is used to receive local oscillator light and backward Rayleigh Brillouin scattering respectively, and backward Rayleigh Brillouin is dissipated
Light is penetrated to be mixed and by exporting intermediate-freuqncy signal after opto-electronic conversion with local oscillator light；
Amplifier, it is used to be amplified the intermediate-freuqncy signal；
Capture card, it is used to carry out digital sample to the intermediate-freuqncy signal after amplification.
10. measurement system for sea water temperature as claimed in claim 7, it is characterised in that：The ocean temperature inverse model is：
T(S,νB)=a0+a1(νB-7.5)+a2(νB-7.5)2+a3(νB-7.5)3+a4(νB-7.5)6+
S[a5+a6(νB-7.5)+a7(νB-7.5)2+a8(νB-7.5)3]
Wherein, T is temperature, aiFor constant, i=1,2 ... ..., 8, νBFor Brillouin shift, S is the salinity in seawater.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051108A (en) * | 2017-11-30 | 2018-05-18 | 华中科技大学鄂州工业技术研究院 | A kind of seawater temp measuring system and method based on low pulse energy Gao Zhongying laser |
| CN108088481A (en) * | 2017-11-30 | 2018-05-29 | 华中科技大学鄂州工业技术研究院 | One kind is based on the contactless multi-parameter laser measurement system in flow field and method |
| CN111142121A (en) * | 2019-12-20 | 2020-05-12 | 自然资源部第二海洋研究所 | Brillouin scattering temperature measurement laser radar system based on two-stage virtual image phase array |
| CN114353989A (en) * | 2022-01-13 | 2022-04-15 | 江苏海洋大学 | Seawater temperature remote sensing system based on laser scattering |
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| CN114485988A (en) * | 2022-01-18 | 2022-05-13 | 江苏海洋大学 | Underwater temperature remote measuring system based on Raman spectrum |
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