CN103175629A - Method for fast measuring sea water temperature - Google Patents
Method for fast measuring sea water temperature Download PDFInfo
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- CN103175629A CN103175629A CN2013100767983A CN201310076798A CN103175629A CN 103175629 A CN103175629 A CN 103175629A CN 2013100767983 A CN2013100767983 A CN 2013100767983A CN 201310076798 A CN201310076798 A CN 201310076798A CN 103175629 A CN103175629 A CN 103175629A
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Abstract
The invention relates to a method for fast measuring sea water temperature. A pulse green light transmitted by a seed injection single frequency laser is split into a reference laser beam and a test laser beam through a splitting piece. The reference laser beam radiates into near reference sea water with known temperature. The test layer beam radiates into far to-be-measured seat water. Laser output amount is adjusted to be larger than stimulated Brillouin scattering threshold of sea water. Brillouin scattering optical signals of reference sea water and to-be-measured sea water are reversely transmitted along the incidence direction and combined by the splitting piece to generate a difference frequency optical signal on a broadband detector photosensitive face, and difference frequency is related to temperature difference of reference sea water and to-be-measured sea water. The broadband detector converts the difference frequency optical signal into an electric signal and inputs the electric signal to a broadband oscilloscope to figure out difference frequency, temperature difference of the reference sea water and the to-be-measured sea water can be calculated through data processing, and sea water temperature can be calculated. The method is simple and convenient to operate, fast in measuring, high in stability, and low in system cost.
Description
Technical field
The invention belongs to the marine monitoring field, relate to a kind of method based on laser coherence Brillouin scattering Quick Measurement ocean temperature.
Background technology
Utilize in recent years Brillouin lidar technology that the Brillouin scattering of laser in seawater monitor the ocean because it can be airborne carries out large tracts of land, Quick Measurement to velocity of sound distribution in subsurface sea water temperature, salinity and water etc., have important economy, society and application value in army and be subject to the generally attention in world ocean monitoring field.Compare with the Raman scattering of seawater, the Brillouin frequency shifts amount is less, incident light and the scattered light seawater transmission window that can exist together, and the radar system detectivity is high, and is not subject to the background radiation impact, strong interference immunity, measuring accuracy is high.
Because Brillouin scattering is relevant with the hot Brownian movement of seawater hydrone, obtain ocean temperature by detecting the Brillouin frequency shifts amount, deducing.Although scanning F-P interferometer can accurately be measured Brillouin scattering spectrum, because repetition frequency that at present can the actual high-power pulsed laser that uses is very low, cause the scan period of interferometer to reach 100s, therefore can't realize real-time detection.And the reception solid angle of interferometer is very little, and the depth of parallelism of incident light is proposed very high request; The interferometer shock resistance is poor, can't be used for field experiment.Propose to utilize the precipitous Absorption Line of iodine molecule absorption cell to absorb the Rayleigh scattering echo in " the edge detection method of Brillouin scattering in water " that 1999 " Chinese laser " the 26th the 4th phase of volume delivers, transmission Brillouin peak makes the small change in location of Brillouin spectrum be converted into the great changes of light intensity after absorption cell.The edge detection technology is used for frequency measurement and has very high measuring accuracy and sensitivity, can solve F-P interferometer reception solid angle little long with sweep time, the problem of anti-vibration ability, but in order to control the molecule absorption line style, need to use complicated temperature and pressure control system, and the frequency stability of laser instrument has been proposed very harsh requirement.The Liu Dahe of Beijing Normal University proposes a kind of method (2008 " Northeast China Normal University's journal " (natural science edition), the 40th the 3rd phase of volume) of utilizing solid F-P etalon and ICCD to survey the Brillouin scattering spectrum of water in " brillouin scattering signal in surveying water with F-P etalon and ICCD " article of delivering.But at present the Pixel Dimensions of ICCD is larger, and frame frequency is lower, measuring error and the measuring speed of Brillouin spectrum also had certain limitation, and price is very expensive.
Summary of the invention
Technical matters to be solved by this invention is to overcome above-mentioned the deficiencies in the prior art, provides a kind of simple to operate, and test speed is fast, and stability is high, the method for the Quick Measurement ocean temperature that system cost is low.
The technical scheme that the present invention solves the problems of the technologies described above employing is: a kind of method of Quick Measurement ocean temperature, it is characterized in that: it comprises the following steps: the S polarization state pulse laser of at first the pouring-in pure-tone polse laser instrument of seed being launched is through the polarization beam splitter beam splitting, the laser beam of reflection is as the testing laser bundle, and the laser beam of transmission is as the reference laser beam; Then the testing laser bundle is become circularly polarized light through after quarter-wave plate, focus in tested seawater through focus lens group, make tested seawater produce stimulated Brillouin scattering; By after quarter-wave plate, the polarization direction becomes the P direction to the stimulated Brillouin scattering light signal of tested seawater again, through inciding on the photosurface of wideband detector after the polarization beam splitter transmission; Simultaneously reference laser beam becomes circularly polarized light after by quarter-wave plate, is focused on by condenser lens after coupled lens, fiber delay time device in the reference seawater of known temperature, makes with reference to seawater and produces stimulated Brillouin scattering; Again by after condenser lens, fiber delay time device, coupled lens and quarter-wave plate, the polarization direction becomes the P direction, reflexes on the photosurface of wideband detector through polarization beam splitter with reference to the stimulated Brillouin scattering light signal of seawater; Regulate fiber delay time device delay time, make the stimulated Brillouin scattering light signal stack of reference laser and testing laser interfere generation difference frequency light signal; Change the difference frequency light signal into electric signal by wideband detector, and the input wide-band oscilloscope is measured the difference frequency frequency; At last, according to difference frequency frequency and tested seawater with reference to the relation of temperature difference between seawater, carry out by computing machine the temperature gap that data are processed the reference seawater that obtains tested seawater and known temperature, and then obtain the temperature of tested seawater.
The present invention is based on the laser coherence Brillouin scattering and measure ocean temperature, the pure-tone polse green glow of laser instrument emission is divided into a branch of reference laser beam and a branch of testing laser bundle through beam splitting chip, and reference laser beam incides in the reference seawater of known temperature nearby; The testing laser bundle incides in tested seawater at a distance.Regulate the Laser output energy greater than the stimulated Brillouin scattering threshold value of seawater, with reference to the stimulated Brillouin scattering light signal of seawater and tested seawater along the incident direction reverse transfer, close after bundle at the relevant difference frequency light signal that produces of wideband detector photosurface through beam splitting chip, the difference frequency frequency is with relevant with reference to the temperature difference of seawater and tested seawater.Wideband detector is converted into the difference frequency light signal electric signal and inputs wide-band oscilloscope, measures the difference frequency frequency, processes calculating tested seawater and temperature difference with reference to seawater through data, and then calculates the temperature of tested seawater.against existing technologies, the Brillouin frequency shifts of seawater is measured in laser coherence Brillouin scattering of the present invention, the inverting ocean temperature, substituted the general scanning F-P interferometer that adopts at present, or based on bromine, the edge detecting technology of iodine molecule absorption cell, and the imaging technique that utilizes ICCD, the scan period that both need not to be scanned the F-P interferometer is long, the reception solid angle is little, the restriction of the poor grade of shock resistance, need not again because of bromine, iodine molecule absorption cell spectral absorption poor stability and to bromine, iodine steam carries out complicated constant temperature and pressure and controls, also need not the frequency stability of laser instrument is proposed too harsh requirement, more need not to be subjected to the large Pixel Dimensions of ICCD, low frame rate and the measuring error and the speed restriction that cause.The present invention is simple to operate, convenient, and test speed is fast, and stability is high, and system cost is low, is a kind of method of desirable Quick Measurement ocean temperature.
Description of drawings
Fig. 1 is that the present invention forms device and measuring process schematic diagram.
Label in figure is: 1. the pouring-in pure-tone polse laser instrument of seed, 2. polarization beam splitter, 3. quarter-wave plate, 4. focus lens group, 5. tested seawater, 6. quarter-wave plate, 7. coupled lens, 8. fiber delay time device, 9. condenser lens, 10. with reference to seawater, 11. wideband detectors, 12. wide-band oscilloscope, 13. computing machines.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of method based on Brillouin scattering Quick Measurement ocean temperature, the S polarization state pulse laser of at first the pouring-in pure-tone polse laser instrument of seed (1) being launched is through polarization beam splitter (2) beam splitting.The pouring-in pure-tone polse laser instrument of related seed (1) injects frequency multiplication Nd:YAG laser instrument for seed, output single-frequency 532nm laser, maximum output energy 1J, live width 90MHz, pulse width 10 ns, repetition frequency 10Hz.The laser beam of reflection is as the testing laser bundle, and the laser beam of transmission is as the reference laser beam.Polarization beam splitter (2) is 45 degree with the Output of laser optical axis included angle, and the surface is coated with the polarization deielectric-coating, is 90% for S direction polarized light reflectivity, and transmissivity is 10%.Then will become circularly polarized light after testing laser bundle process quarter-wave plate (3), focus in tested seawater (5) through focus lens group (4), make tested seawater produce stimulated Brillouin scattering.Quarter-wave plate (3) is placed with focus lens group (4) is vertical with laser beam axis, and focus lens group (4) is made of a short focal length negative lens and a long-focus positive lens.Regulate spacing between two lens, can change the focal length of focus lens group (4), make the testing laser bundle focus on the different water depth position, realize different water depth place temperature measurement.By after quarter-wave plate (3), the polarization direction becomes the P direction to the stimulated Brillouin scattering light signal of tested seawater again, through inciding on the photosurface of wideband detector (11) after polarization beam splitter (2) transmission.Reference laser beam becomes circularly polarized light after by quarter-wave plate (6), is focused in the reference seawater (10) of known temperature by condenser lens (9) after coupled lens (7), fiber delay time device (8), makes with reference to seawater and produces stimulated Brillouin scattering.Quarter-wave plate (6), coupled lens (7) and condenser lens (9) is vertical with laser beam axis places have 2 with reference to plane of incidence normal and the optical axis of pond (10)
oThe angle of left and right makes reflected light not overlap with stimulated Brillouin scattering light with reference to seawater.The stimulated Brillouin scattering light signal is again by after condenser lens (9), fiber delay time device (8), coupled lens (7) and quarter-wave plate (6), the polarization direction becomes the P direction, reflexes on the photosurface of wideband detector (11) through polarization beam splitter (2); Regulate the delay time of chronotron (8), the Brillouin scattering light signal of test beams and reference beam is superposeed interfere on wideband detector (11) photosurface and produce the difference frequency light signal, receive through wideband detector (11) and be converted to the difference frequency electric signal, the input wide-band oscilloscope is measured its frequency.At last, according to difference frequency frequency and tested seawater with reference to the relation of temperature difference between seawater, carry out by computing machine the temperature gap that data are processed the reference seawater that obtains tested seawater and known temperature, and then obtain the temperature of tested seawater.Record the delay time of chronotron (8), calculate the degree of depth that in water, institute's location is put.
Device involved in the present invention is general-purpose device, comprise the pouring-in pure-tone polse laser instrument of seed (1), polarization beam splitter (2), quarter-wave plate (3), (6), focus lens group (4), coupled lens (7), fiber delay time device (8), condenser lens (9), wideband detector (11), wide-band oscilloscope (12), computing machine (13) is introduced no longer in detail at this.
The input bandwidth of wideband detector involved in the present invention (11) and wide-band oscilloscope (12) is higher than 1GHz, with the accuracy of the difference frequency signal that guarantees to measure.Computing machine (13) is processed and display device as data, processes by data, accurately obtains tested ocean temperature, and measuring accuracy is high.
Claims (1)
1. the method for a Quick Measurement ocean temperature, it is characterized in that: it comprises the following steps: the S polarization state pulse laser of at first the pouring-in pure-tone polse laser instrument of seed being launched is through the polarization beam splitter beam splitting, the laser beam of reflection is as the testing laser bundle, and the laser beam of transmission is as the reference laser beam; Then the testing laser bundle is become circularly polarized light through after quarter-wave plate, focus in tested seawater through focus lens group, make tested seawater produce stimulated Brillouin scattering; By after quarter-wave plate, the polarization direction becomes the P direction to the stimulated Brillouin scattering light signal of tested seawater again, through inciding on the photosurface of wideband detector after the polarization beam splitter transmission; Simultaneously reference laser beam becomes circularly polarized light after by quarter-wave plate, is focused on by condenser lens after coupled lens, fiber delay time device in the reference seawater of known temperature, makes with reference to seawater and produces stimulated Brillouin scattering; Again by after condenser lens, fiber delay time device, coupled lens and quarter-wave plate, the polarization direction becomes the P direction, reflexes on the photosurface of wideband detector through polarization beam splitter with reference to the stimulated Brillouin scattering light signal of seawater; Regulate fiber delay time device delay time, make the Brillouin scattering light signal stack of reference laser and testing laser interfere generation difference frequency light signal; Change the difference frequency light signal into electric signal by wideband detector, and the input wide-band oscilloscope is measured the difference frequency frequency; At last, according to difference frequency frequency and tested seawater with reference to the relation of temperature difference between seawater, carry out by computing machine the temperature gap that data are processed the reference seawater that obtains tested seawater and known temperature, and then obtain the temperature of tested seawater.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330387A (en) * | 2014-11-13 | 2015-02-04 | 西安电子科技大学 | Liquid-level oil contamination measurement system |
| CN104614343A (en) * | 2015-02-04 | 2015-05-13 | 南昌航空大学 | Brillouin-scattering-based water hardness monitoring method |
| CN105890633A (en) * | 2016-05-24 | 2016-08-24 | 郑州轻工业学院 | Device for measuring Brillouin scattering of sample to be measured under high pressure condition |
| CN107290063A (en) * | 2017-06-30 | 2017-10-24 | 华中科技大学鄂州工业技术研究院 | A kind of ocean temperature measuring method and system |
| CN109946267A (en) * | 2019-04-18 | 2019-06-28 | 南昌航空大学 | Gas Rayleigh-Brillouin spectral lines measuring device and method |
| CN110031128A (en) * | 2019-05-20 | 2019-07-19 | 威海怡和专用设备制造有限公司 | One kind is from difference frequency stimulated Brillouin scattering temperature measurement method |
| CN110686778A (en) * | 2019-09-05 | 2020-01-14 | 天津大学 | Non-contact water temperature measuring device and method based on optical frequency comb |
| CN113776565A (en) * | 2021-07-06 | 2021-12-10 | 田斌 | Underwater Brillouin scattering spectrum measuring device and measuring method |
| CN114485988A (en) * | 2022-01-18 | 2022-05-13 | 江苏海洋大学 | Underwater temperature remote measuring system based on Raman spectrum |
| CN115753682A (en) * | 2022-11-07 | 2023-03-07 | 山东大学 | Seawater salinity measuring device and method with temperature self-decoupling function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104330387A (en) * | 2014-11-13 | 2015-02-04 | 西安电子科技大学 | Liquid-level oil contamination measurement system |
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| CN105890633A (en) * | 2016-05-24 | 2016-08-24 | 郑州轻工业学院 | Device for measuring Brillouin scattering of sample to be measured under high pressure condition |
| CN107290063A (en) * | 2017-06-30 | 2017-10-24 | 华中科技大学鄂州工业技术研究院 | A kind of ocean temperature measuring method and system |
| CN109946267A (en) * | 2019-04-18 | 2019-06-28 | 南昌航空大学 | Gas Rayleigh-Brillouin spectral lines measuring device and method |
| CN109946267B (en) * | 2019-04-18 | 2022-02-25 | 南昌航空大学 | Device and method for measuring gas Rayleigh-Brillouin scattering spectral line |
| CN110031128A (en) * | 2019-05-20 | 2019-07-19 | 威海怡和专用设备制造有限公司 | One kind is from difference frequency stimulated Brillouin scattering temperature measurement method |
| CN110031128B (en) * | 2019-05-20 | 2021-01-12 | 威海怡和专用设备制造有限公司 | Self-difference frequency stimulated Brillouin scattering water temperature measuring method |
| CN110686778A (en) * | 2019-09-05 | 2020-01-14 | 天津大学 | Non-contact water temperature measuring device and method based on optical frequency comb |
| CN110686778B (en) * | 2019-09-05 | 2021-02-19 | 天津大学 | Non-contact water temperature measuring device and method based on optical frequency comb |
| CN113776565A (en) * | 2021-07-06 | 2021-12-10 | 田斌 | Underwater Brillouin scattering spectrum measuring device and measuring method |
| CN114485988A (en) * | 2022-01-18 | 2022-05-13 | 江苏海洋大学 | Underwater temperature remote measuring system based on Raman spectrum |
| CN115753682A (en) * | 2022-11-07 | 2023-03-07 | 山东大学 | Seawater salinity measuring device and method with temperature self-decoupling function |
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