CN108507697B - A kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor - Google Patents
A kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor Download PDFInfo
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- CN108507697B CN108507697B CN201810164410.8A CN201810164410A CN108507697B CN 108507697 B CN108507697 B CN 108507697B CN 201810164410 A CN201810164410 A CN 201810164410A CN 108507697 B CN108507697 B CN 108507697B
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Abstract
A kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, including narrow-band light source, photo-coupler, optical splitter, circulator, photoswitch, optical fiber temperature depth cable, data collecting card and control unit, the optical signals photo-coupler of the narrow-band light source output is divided into reference light and sense light, reference light is successively sent into data collecting card through F-P etalon and photoelectric detector, sense light is divided into multichannel through optical splitter, it is every successively to enter optical fiber temperature depth cable through circulator and photoswitch all the way, the reflected light of optical fiber temperature depth cable is sent into data collecting card through photoelectric detector after backtracking to circulator, the data collecting card is connect with control unit.The present invention is measured using depth and temperature of the optical fiber temperature depth cable to seawater, not only realizes real-time, the quasi-distributed measurement of ocean temperature section, but also measurement accuracy is high, equipment failure rate is low.Since sensing probe uses parallel arrangement mode, signal cross-talk problem is not present, to improve the functional reliability of equipment.
Description
Technical field
The present invention relates to a kind of devices using optical fiber sensing technology real-time measurement ocean temperature section, belong to measuring technique
Field.
Background technique
Ocean temperature is the important content of oceanographic survey, monitoring, is indispensable in marine hydrology, meteorological observation and investigation
Technical parameter.The measurement of ocean temperature section is to research Marine Sciences, marine environmental monitoring, seasonal climate prediction and ocean
Fishery etc. has highly important Practical significance.So-called seawater temperature profile measurement refers to along depth direction measurement ocean temperature point
Cloth situation provides the temperature information at the depth of water and respective depth, observation will also provide corresponding observation time in real time for a long time.
Currently, being all made of thermohaline deep-sea ocean visualizer (CTD) both at home and abroad to measure ocean temperature section, thermohaline depth Oceanic View
It surveys instrument and is mainly equipped with electronic surveying railway superstructures by three kinds of temperature, salinity and pressure sensors.It passes data collector, data
The electronic part encapsulations such as defeated unit and power supply are in high-intensitive pressure vessel.CTD temperature measurement accuracy can achieve 0.001 DEG C etc.
Grade, it patrols testing temperature, salinity and depth in different depth by hanging point by point, thermohaline depth section is obtained, the disadvantage is that can not achieve
Real-time and long-time simultaneous observation temperature profile variation.
Thermohaline deep-sea ocean visualizer is by measurement seawater pressure come indirect Measuring Oceanic depth, and measurement performance is direct
Determine the positioning accuracy of ocean essential observation level.Marine pressure sensing mainly uses electronic pressure sensor at present, such as
Silicon piezoresistive pressure sensor and quartz resonance pressure sensor etc..Electronic pressure sensor is easy in severe complicated marine environment
By signal cross-talk, cable water inlet also results in the failures such as short circuit, to affect the reliability of marine pressure monitoring.
In conclusion existing sea water temperature depth profile survey device exists vulnerable to signal cross-talk, high failure rate, reliable operation
Property it is poor, cannot achieve in real time and the disadvantages of long-time simultaneous observation, it is necessary to be improved.
Summary of the invention
It is an object of the invention to aiming at the disadvantages of the prior art, provide a kind of sea water temperature depth section based on Fibre Optical Sensor
Measuring system to realize the real-time and long-time simultaneous observation of sea water temperature depth section, and improves the functional reliability of system.
Problem of the present invention is realized with following technical proposals:
A kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor includes the adjustable narrow band light of wavelength value in composition
Source, photo-coupler, optical splitter, circulator, photoswitch, optical fiber temperature depth cable, data collecting card and control unit, the narrow band light
The optical signals photo-coupler of source output is divided into reference light and sense light, and reference light is successively through F-P etalon and photoelectric detector
It is sent into data collecting card, sense light is divided into multichannel through optical splitter, every successively to enter optical fiber temperature through circulator and photoswitch all the way
Deep cable, the reflected light of optical fiber temperature depth cable are sent into data collecting card, the number through photoelectric detector after backtracking to circulator
It is connect according to capture card with control unit.
The above-mentioned sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, the adjustable narrow-band light source of wavelength value include width
Band light source, isolator, tunable TEA CO2 laser and image intensifer, the optical signal of the wideband light source output successively through isolator,
Tunable TEA CO2 laser and image intensifer are sent into photo-coupler, and the wavelength value control terminal of the tunable TEA CO2 laser passes through number
It is connect according to capture card with control unit.
The above-mentioned sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, the optical fiber temperature depth cable includes optical signal transmission cable
With the deep sensing unit of multiple temperature equidistantly arranged along optical signal transmission cable, the deep sensing unit of each temperature includes with sealing cover
Stainless Steel Shell, twin fiber cable, FBG temperature sensor and optical fiber F-P pressure sensor, the twin fiber cable are passed through and are fixed on
In the centre bore of sealing cover, the FBG temperature sensor is fixed on the inner wall of Stainless Steel Shell and is led to by stainless steel stent
It crosses in twin fiber cable a optical fiber to connect with an optical fiber in optical signal transmission cable, the optical fiber F-P pressure sensor is solid
It is scheduled in the through-hole in Stainless Steel Shell and by a light in another optical fiber and optical signal transmission cable in twin fiber cable
Fibre connection.
The above-mentioned sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, the optical fiber F-P pressure sensor includes capillary
Quartz ampoule 16, silicon base 17 and presser sensor silicon wafer 19 in the through-hole that the silicon base 17 is located in Stainless Steel Shell and pass through
The hole wall of sealant and through-hole is tightly connected, and is equipped with towards the one side outside Stainless Steel Shell by presser sensor silicon in silicon base 17
The groove that piece 19 covers, in the through-hole for the bottom portion of groove that the capillary quartz ampoule 16 is fixed on silicon base 17, in twin fiber cable
In piece optical fiber insertion capillary quartz ampoule 16, on the optical fiber end face opposite with presser sensor silicon wafer 19 and presser sensor silicon
Piece 19 it is opposite with optical fiber be equipped with high-reflecting film on one side.
The above-mentioned sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, the Stainless Steel Shell are equipped with and FBG temperature
The corresponding through-hole of sensor, the through-hole are sealed by grating sealing bolt.
The above-mentioned sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, the Stainless Steel Shell are compiled equipped with stainless steel wire
Knitmesh, the stainless steel wire mesh grid cover on grating sealing bolt and optical fiber F-P pressure sensor.
The above-mentioned sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, the optical signal transmission cable include more stainless steels
Pipe and more single mode optical fibers, the more twisted strandings of stainless steel tube penetrate a single mode optical fiber, the single mode in every stainless steel tube
Optical fiber ointment is filled between optical fiber and stainless steel tube.
The above-mentioned sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, the deep sensing unit of the temperature are protected by vulcanized rubber
Pipe is wrapped up on optical signal transmission cable.
The above-mentioned sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, the photoswitch are Multichannel photoswitch, multichannel light
Each channel of switch is corresponding with an optical fiber in optical fiber temperature depth cable.
The above-mentioned sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, passes through between the sealing cover and Stainless Steel Shell
It is threadedly coupled, is additionally provided with sealing rubber ring between.
The present invention is measured using depth and temperature of the optical fiber temperature depth cable to seawater, not only realizes ocean temperature section
Real-time, quasi-distributed measurement, and measurement accuracy is high, and equipment failure rate is low.Since sensing probe uses parallel arrangement mode,
There is no signal cross-talk problems, to improve the functional reliability of equipment.
The present invention is measured using depth and temperature of the optical fiber temperature depth cable to seawater, and sensing probe uses parallel arrangement side
Formula, when single grating temperature sensor damages when can be avoided series demultiplex, what rear end sensor measurement data can not transmit is asked
Topic.The F-P pressure sensor that system uses is based on multiple-beam interference principle, and not only fineness is high for F-P cavity, but also chamber length is very short,
So that its Free Spectral Range is greater than the wave-length coverage of light source, guarantees that the interference spectrum being reflected back only includes within the scope of optical source wavelength
One trough.By the way of in parallel, the trough overlapping that can be avoided reflectance spectrum in measurement process generates F-P pressure sensor
Crosstalk, reduce measurement error.Real-time, the quasi-distributed measurement of ocean temperature section is realized, and measurement accuracy is high, equipment
Failure rate is low.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawing.
Fig. 1 is the structural schematic diagram of optical fiber temperature depth cable used in the present invention；
Fig. 2 is warm deep sensing unit longitudinal sectional drawing；
Fig. 3 is warm deep sensing unit schematic bottom view (eliminating stainless steel wire mesh grid)；
Fig. 4 is optical fiber F-P pressure sensor structural schematic diagram；
Fig. 5 is index path of the invention；
Fig. 6 is FBG reflectance spectrum schematic diagram；
Fig. 7 is optical fiber F-P pressure sensor reflectance spectrum schematic diagram.
Each label in figure are as follows: 1, optical signal transmission cable, 2, the deep sensing unit of temperature, 3, vulcanized rubber protection pipe, 4, twin-core light
Cable, 5, sealing cover, 6, optical fiber, 7, sealing rubber ring, 8, stainless steel stent, 9, epoxy resin, 10, FBG temperature sensor, 11, no
Become rusty steel sheel, 12, grating sealing bolt, 13, stainless steel wire mesh grid, 14, sealant, 15, optical fiber F-P pressure sensor, 16,
Capillary quartz ampoule, 17, silicon base, 18, high-reflecting film, 19, presser sensor silicon wafer.
Specific embodiment
System that the sea water temperature depth section based on Fibre Optical Sensor continuously measures that the present invention provides a kind of, which can be real
When and long-time simultaneous observation temperature profile dynamic change, obtain and deep-sea detecting, take to improve three-dimensional Ocean environment information
Sample ability pushes the development of national marine high tech equipment.
The present invention includes optical fiber temperature depth cable and high-precision demodulating system, and the structure of each section is as follows:
Referring to Fig. 1, optical fiber temperature depth cable includes optical signal transmission cable 1 (the twisted transmission cable of capillary tubing), the deep sensing list of temperature
Member 2 and vulcanized rubber protection pipe 3.Vulcanized rubber protection pipe is by the fusion point and light of warm deep sensing unit and optical signal transmission cable 1
Signal transmits cable 1 and the vulcanization of part Stainless Steel Shell 11 is fixed, while to guarantee fiber F-P pressure sensing in warm deep sensing unit
For the measurement end and FBG temperature sensor of device other than vulcanized rubber protection pipe, vulcanized rubber protection pipe is same protection fusion point
When the fixed deep sensing unit of temperature.In the present embodiment, the deep sensing unit of 12 temperature is one group, is connected to one 24 by fenestration
On core optical cable, totally 5 groups, 60 measurement points, interval of measuring points 5m, overall length 300m.
Optical signal transmission cable 1 uses the twisted structure of capillary stainless steel tube, the more twisted strandings of stainless steel tube, every stainless steel
Include 1 single mode optical fiber in pipe, fills optical fiber ointment in pipe.It is identified outside stainless steel tube using different colours.Optical fiber temperature passes deeply
Unit is felt by welding at equal intervals on optical signal transmission cable 1, and fusion point and the deep sensing unit of temperature are fixed and protected using vulcanized rubber
Shield.
Referring to Fig. 2, temperature depth sensing unit 2 includes Stainless Steel Shell 11, twin fiber cable 4, FBG temperature with sealing cover 5
Sensor 10 and optical fiber F-P pressure sensor 15, sealing cover 5 and Stainless Steel Shell 11 are made of 316L stainless steel sleeve pipe, FBG temperature
Degree sensor 10 is bonded on stainless steel stent 8 by epoxy resin 9, and stainless steel stent 8 is put into Stainless Steel Shell 11, and
Laser welding is utilized at both ends, stainless steel stent 8 is fixed in Stainless Steel Shell 11,11 both ends of Stainless Steel Shell utilize sealing
Cushion rubber 7 and grating sealing bolt 12 are sealed；Optical fiber F-P pressure sensor 15 is put into Stainless Steel Shell 11；Sensor
Surrounding is sealed using sealant 14；Threaded stainless steel wire mesh grid 13 is covered outside Stainless Steel Shell 11；In twin fiber cable 4
Optical fiber 6 pass through FBG temperature sensor 10 in the sealing cover 5 with centre bore and Stainless Steel Shell 11 and fiber F-P pressure passes
15 welding of sensor, fusion point use miniature fibre-optical splice pyrocondensation protection of pipe；Stainless Steel Shell 11 and the sealing cover 5 with centre bore
It is connected by sealing rubber ring 7 with thread seal, center hole part encrypts sealing waterproof.
FBG temperature sensor is fiber-optic grating sensor, it is using fiber bragg grating center wavelength and external parameter at one
The principle of fixed functional relation obtains a kind of sensor of external environment parameters by the variation of detection wavelength.Due to light
Fine grating sensing is detected to the wavelength of light, and light intensity fluctuation does not influence sensing amount (wavelength), therefore its anti-interference energy
Power is strong, high sensitivity, small in size, Yi Zucheng sensing network.Temperature sensor can both use fiber bragg grating (FBG),
Long-period fiber grating (LPG) can also be used.
Optical fiber F-P pressure sensor is based on F-P interferometer principle, using light between fiber end face and presser sensor diaphragm
Multiple roundtrip, make fiber end face reflected light and presser sensor diaphragm reflected light formed interference spectrum, work as sensitive membrane
F-P cavity length is caused to change when being under pressure, the optical path difference of two beam reflected lights changes, and interference spectrum is made to change.It is logical
The variation for crossing detection interference spectrum can measure the long variation of F-P cavity, and then obtain the pressure value of seawater.Such sensor is to composition
Distance change between two reflectings surface of F-P cavity is very sensitive, have sensing sensitivity it is high, it is corrosion-resistant, not by electromagnetic interference, body
The advantages that product is small, durability is strong.
Fig. 4 is the structural schematic diagram of optical fiber F-P pressure sensor, and process is first with high-aspect-ratio processing technology
Silicon base 17 is etched, etching depth is equal to the thickness of silicon base, and through-hole diameter is greater than the diameter of capillary quartz ampoule 16；The quarter of groove
It is long equal to the chamber of EFPI sensor to lose depth, optical fiber connector is equipped with gradient-index lens GRIN；Insert optical fibers into capillary quartz
Guan Zhong, optical fiber are fixed with capillary quartz ampoule welding, and capillary quartz ampoule is connected with silicon base 17 using welding process；Fiber end face plating
Plate high-reflecting film 18 in one end face of high-reflecting film, presser sensor silicon wafer 19；High-reflecting film can be composite dielectric film；Silicon base 17 and pressure
Power sensitivity silicon wafer 19 is connected by the way of anode linkage, forms F-P cavity between fiber end face and presser sensor silicon wafer 19.
Referring to Fig. 5, high-precision demodulating system is by wideband light source, isolator, tunable TEA CO2 laser, image intensifer, light
Coupler, F-P etalon, optical splitter, fiber optical circulator, photoswitch, photoelectric detector, data collecting card and control unit group
At.
Process amplification and gain flattening wideband light source of the wideband light source for C-band or C+L wave band, usually selection SLED
Wideband light source；High-precision demodulating system demodulation rate is 100~500Hz, meets the needs of ocean temperature variation；Isolator is only
The light from wideband light source direction is allowed to pass through, the light being reflected back through sensor can not pass through, to avoid reflected light to broadband light
The influence in source.
The broadband optical signal that wideband light source issues incident tunable TEA CO2 laser after isolator, filters through tunable F-P
Narrowband light wave is formed after device, narrowband light wave is after image intensifer amplifies and is gain flattening, the coupler for being 99:1 through splitting ratio
It is divided into two ways of optical signals, the optical channel that accounting is 1% is as reference channel, and reference optical signal is through F-P etalon and Photoelectric Detection
It is acquired after device by data collecting card；It is sensing passage that accounting is 99% all the way, senses optical signal through 1 × M optical splitter and is divided into M
Road optical signal, every road optical signal connect 11 × N photoswitch through circulator again, and photoswitch is controlled by control unit.Due to every
A sensing unit is divided into temperature and depth measurement two parts, and therefore, system can access altogetherA sensing unit, according to measurement
Demand selects suitable light source, optical splitter and photoswitch.
Signal is followed by warm deep sensing unit through photoswitch, and two sensing pathway of the deep sensing unit of each temperature connect two respectively
The corresponding position of photoswitch guarantees that temperature and depth can measure simultaneously.The sawtooth that control unit is provided by data collecting card
Wave voltage scans tunable TEA CO2 laser, adjusts the wavelength value of tunable TEA CO2 laser transmission narrowband light wave, is allowed to traverse whole
A work spectral range, the reflection of fiber grating of the spectral region in tunable TEA CO2 laser free transmission range in sensing passage
Light intensity is maximum, and the central wavelength that photoelectric detector exports tunable TEA CO2 laser corresponding when maximum value is the spectrum model
The peak wavelength of fiber grating in enclosing.Optical fiber F-P pressure sensor 15 in depth measurement channel is simultaneously by seawater pressure and seawater
The influence of temperature change carries out real-time compensation using the ocean temperature of temperature sensor measurement, obtains high-precision sea water advanced
Measured value.The light that temperature and depth sensing channel return is input to synchronous high-speed data after photoelectric detector is converted to electric signal
The signal of acquisition is sent to control unit and handled by capture card, data collecting card.
Specific measuring process of the invention is as follows:
A, laboratory temperature calibration is carried out to each FBG temperature sensor, obtain the bragg wavelengths of temperature sensor with
Relational expression between temperature T；
B, laboratory temperature calibration and pressure calibration are carried out to each optical fiber F-P pressure sensor: passes through laboratory temperature
Calibration obtains variation and pressure sensing that pressure sensor only considers that F-P cavity is long when temperature influences at ambient pressure conditions
Device only considers F-P cavity long variation when pressure influence under the conditions of reference temperature, obtains F-P cavity length and temperature, the relationship of pressure.
C, optical fiber temperature depth cable is laid in seawater along sea water advanced direction；
D, it is measured using demodulating system and optical fiber temperature depth cable；
E, the signal measured is handled, obtains temperature and depth value.The ocean temperature that is measured according to sensing unit and
It is sea water advanced, draw ocean temperature section curve.
Fig. 6 is FBG reflectance spectrum schematic diagram, and FBG is a kind of fiber grating, and refractive index modulation depth and screen periods are general
It is all constant, when incident light spectrum passes through FBG, the monochromatic light that wavelength is λ returns incidence end, remaining light transmission by optical grating reflection.FBG
Reflected light bragg wavelengths meet λ=2neffΛ, wherein neffFor optical fiber effective refractive index, Λ is the period of grating.Optical fiber
The period of effective refractive index and grating of the basic mode on bragg wavelength is all the function of temperature and strain.Therefore, it temperature and answers
The variation of change can be reflected by the variation of bragg wavelengths.Under conditions of shielding strain, bragg wavelengths are
The function of temperature calculates the temperature of measurement using the coefficient of calibration by detecting reflectance spectrum bragg wavelength value.
Fig. 7 is the reflectance spectrum schematic diagram of optical fiber F-P pressure sensor in the present invention, and F-P pressure sensor is based on multiple beam
Principle of interference, not only fineness is high for the F-P cavity of use, but also chamber length is very short, its Free Spectral Range is made to be greater than the wavelength of light source
Range guarantees the interference spectrum being reflected back within the scope of optical source wavelength only comprising a trough.It, can using the variation of wave trough position
To obtain the long variation of EFPI chamber.
The present invention carries out temperature measurement using fiber grating, while the height of depth is realized using optical fiber F-P pressure sensor
Precision measure improves the positioning accuracy of ocean essential observation level, and temperature sensor and pressure sensor are using waterproof pressure
Seal Design contacts the component of seawater using 316L stainless steel material, and corrosion resistance is good.The sensing probe of system uses parallel connection side
Formula can not only realize real-time, the quasi-distributed measurement of ocean temperature section, and after the damage of some grating, other light
Grid remain to continue to measure.
Claims (8)
1. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, characterized in that include that wavelength value is adjustable in composition
Narrow-band light source, photo-coupler, optical splitter, circulator, photoswitch, optical fiber temperature depth cable, data collecting card and control unit, it is described
The optical signals photo-coupler of narrow-band light source output is divided into reference light and sense light, and reference light is successively through F-P etalon and photoelectricity
Detector is sent into data collecting card, and sense light is divided into multichannel through optical splitter, per all the way successively through circulator and photoswitch entrance
The reflected light of optical fiber temperature depth cable, optical fiber temperature depth cable is sent into data collecting card through photoelectric detector after backtracking to circulator,
The data collecting card is connect with control unit；
The adjustable narrow-band light source of wavelength value includes wideband light source, isolator, tunable TEA CO2 laser and image intensifer, institute
The optical signal for stating wideband light source output is successively sent into photo-coupler through isolator, tunable TEA CO2 laser and image intensifer, described
The wavelength value control terminal of tunable TEA CO2 laser is connect by data collecting card with control unit；
The optical fiber temperature depth cable includes optical signal transmission cable (1) and multiple Wen Shen for equidistantly arranging along optical signal transmission cable (1)
Sensing unit (2), the deep sensing unit (2) of each temperature include the Stainless Steel Shell (11) for having sealing cover (5), twin fiber cable (4),
FBG temperature sensor (10) and optical fiber F-P pressure sensor (15), the twin fiber cable (4) pass through and are fixed on sealing cover (5)
Centre bore in, the FBG temperature sensor (10) is fixed on the inner wall of Stainless Steel Shell (11) by stainless steel stent (8)
And it is connect by an optical fiber in twin fiber cable (4) with an optical fiber in optical signal transmission cable (1), the fiber F-P pressure
Force snesor (15) is fixed in the through-hole on Stainless Steel Shell (11) and by another optical fiber and light in twin fiber cable (4)
Signal transmits the optical fiber connection in cable (1).
2. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor according to claim 1, characterized in that described
Optical fiber F-P pressure sensor (15) includes capillary quartz ampoule (16), silicon base (17) and presser sensor silicon wafer (19), the silicon substrate
Bottom (17) is located in the through-hole on Stainless Steel Shell (11) and is tightly connected by the hole wall of sealant (14) and through-hole, in silicon substrate
Bottom (17) is equipped with the groove covered by presser sensor silicon wafer (19), the capillary stone towards the external one side of Stainless Steel Shell (11)
English pipe (16) is fixed in the through-hole of the bottom portion of groove of silicon base (17), and an optical fiber in twin fiber cable (4) is inserted into capillary stone
In English pipe (16), on the optical fiber end face opposite with presser sensor silicon wafer (19) and presser sensor silicon wafer (19) and optical fiber phase
Pair be equipped with high-reflecting film (18) on one side.
3. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor according to claim 2, characterized in that described
Stainless Steel Shell (11) is equipped with through-hole corresponding with FBG temperature sensor (10), and the through-hole is by grating sealing bolt (12)
Sealing.
4. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor according to claim 3, characterized in that described
Stainless Steel Shell (11) is equipped with stainless steel wire mesh grid (13), and the stainless steel wire mesh grid (13) covers on grating sealing bolt
(12) and on optical fiber F-P pressure sensor (15).
5. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor according to claim 4, characterized in that described
Optical signal transmission cable (1) includes more stainless steel tubes and Duo Gen single mode optical fiber, the more twisted strandings of stainless steel tube, every stainless steel
A single mode optical fiber is penetrated in pipe, fills optical fiber ointment between the single mode optical fiber and stainless steel tube.
6. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor according to claim 5, characterized in that described
Warm depth sensing unit (2) is wrapped up on optical signal transmission cable (1) by vulcanized rubber protection pipe (3).
7. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor according to claim 6, characterized in that described
Photoswitch is Multichannel photoswitch, and each channel of Multichannel photoswitch is corresponding with an optical fiber in optical fiber temperature depth cable.
8. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor according to claim 7, characterized in that described
It is connected through a screw thread between sealing cover (5) and Stainless Steel Shell (11), is additionally provided with sealing rubber ring (7) between.
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| CN109142278A (en) * | 2018-09-14 | 2019-01-04 | 华北电力大学（保定） | A kind of measurement method of seawater salinity |
| CN109459071A (en) * | 2018-11-27 | 2019-03-12 | 北京希卓信息技术有限公司 | Fiber grating monitoring system |
| CN109443405A (en) * | 2018-12-13 | 2019-03-08 | 云南电网有限责任公司电力科学研究院 | A kind of optic fiber grating wavelength demodulating system |
| CN110907401A (en) * | 2019-05-28 | 2020-03-24 | 天津工业大学 | Seawater salinity measuring device based on multi-section conical quartz fiber mode interference structure |
| CN110530550B (en) * | 2019-08-12 | 2020-10-09 | 温州大学 | Signal demodulation method of quasi-distributed temperature sensing system |
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| CN110887525B (en) * | 2019-12-02 | 2021-06-04 | 中国人民解放军国防科技大学 | CTD sensing array based on micro-nano optical fiber coupler SAGNAC ring |
| CN112577622B (en) * | 2020-11-12 | 2022-12-06 | 山东省科学院海洋仪器仪表研究所 | Sectional three-dimensional temperature array sensor for seawater skin temperature measurement |
| CN116105778B (en) * | 2023-04-12 | 2023-06-23 | 广东海洋大学深圳研究院 | Optical fiber sensing system for synchronous measurement of temperature and salt |
| US11965821B1 (en) | 2023-04-12 | 2024-04-23 | Guangdong Ocean University | Optical fiber sensing system for temperature and salinity synchronous measurement |
| CN116147676B (en) * | 2023-04-17 | 2023-11-14 | 广东海洋大学深圳研究院 | Optical fiber sensor for synchronously measuring temperature and salt depth and measuring method |
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| CN101858796B (en) * | 2010-05-18 | 2011-11-16 | 华北电力大学（保定） | Seawater temperature profile measurement method based on fiber grating principle |
| CN201837485U (en) * | 2010-10-30 | 2011-05-18 | 山东省科学院海洋仪器仪表研究所 | Fiber bragg grating detection system for temperature and depth of seawater |
| CN102269573B (en) * | 2011-05-03 | 2014-11-05 | 东华大学 | Quasi-distributed composite structure strain and temperature detection system |
| CN104457803A (en) * | 2014-11-28 | 2015-03-25 | 中南大学 | Wave length demodulating system and method based on F-P etalon and reference gratings |
| CN204855016U (en) * | 2015-04-21 | 2015-12-09 | 国家海洋技术中心 | Optics jettisons formula ocean temperature depth [record] section accuracy of measurement |
| CN206725121U (en) * | 2017-02-28 | 2017-12-08 | 山东省科学院海洋仪器仪表研究所 | One kind jettisons formula all -fiber sea water temperature depth section sensor |
| CN206876317U (en) * | 2017-06-28 | 2018-01-12 | 电子科技大学 | A kind of all -fiber high sensibility pressure transducer |
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2018
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