CN108507697A - 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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- CN108507697A CN108507697A CN201810164410.8A CN201810164410A CN108507697A CN 108507697 A CN108507697 A CN 108507697A CN 201810164410 A CN201810164410 A CN 201810164410A CN 108507697 A CN108507697 A CN 108507697A
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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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 branching device, 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 sent into data collecting card through F P etalons and photoelectric detector successively, sense light is divided into multichannel through optical branching device, it is every to enter optical fiber temperature depth cable through circulator and photoswitch successively all the way, the reflected light of optical fiber temperature depth cable is sent into data collecting card after backtracking to circulator through photoelectric detector, the data collecting card is connect with control unit.The present invention measures the depth and temperature of seawater using optical fiber temperature depth cable, not only realizes real-time, the quasi-distributed measurement of ocean temperature section, but also high certainty of measurement, equipment failure rate are 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 measuring ocean temperature section in real time using optical fiber sensing technology, belong to measuring technique
Field.
Background technology
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 measuring ocean temperature point along depth direction
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 the pressure vessel of high intensity.CTD temperature measurement accuracies can reach 0.001 DEG C etc.
Grade, it patrols testing temperature, salinity and depth point by point by hanging in different depth, 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 measuring 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 easily by signal cross-talk, high failure rate, reliable operation
Property it is poor, cannot achieve in real time and the shortcomings of long-time simultaneous observation, it is necessary to be improved.
Invention content
It is an object of the invention to be directed to the drawback of the prior art, a kind of sea water temperature depth section based on Fibre Optical Sensor is provided
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, composition include the adjustable narrow band light of wavelength value
Source, photo-coupler, optical branching device, 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 etalons and photoelectric detector
It is sent into data collecting card, sense light is divided into multichannel through optical branching device, every to enter optical fiber temperature through circulator and photoswitch successively all the way
The reflected light of deep cable, optical fiber temperature depth cable is sent into data collecting card, the number after backtracking to circulator through photoelectric detector
It is connect with control unit according to capture card.
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 with control unit according to capture card.
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, each deep sensing unit of temperature includes carrying sealing cover
Stainless Steel Shell, twin fiber cable, FBG temperature sensors 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 sensors are fixed on the inner wall of Stainless Steel Shell and are 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 another optical fiber in twin fiber cable and a light in optical signal transmission 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 chip 19 in the through-hole that the silicon base 17 is located in Stainless Steel Shell and pass through
The hole wall of fluid 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
Piece optical fiber is inserted into capillary quartz ampoule 16, on the optical fiber end face opposite with presser sensor silicon chip 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 measures the depth and temperature of seawater using optical fiber temperature depth cable, not only realizes ocean temperature section
Real-time, quasi-distributed measurement, and high certainty of measurement, equipment failure rate are 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 measures the depth and temperature of seawater using optical fiber temperature depth cable, and sensing probe uses parallel arrangement side
Formula, when can avoid series demultiplex when single grating temperature sensor damage, what rear end sensor measurement data can not transmit asks
Topic.The F-P pressure sensors that system uses are 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 more than the wave-length coverage of light source, ensures that the interference spectrum being reflected back includes only within the scope of optical source wavelength
One trough.F-P pressure sensors can be avoided the trough of reflectance spectrum in measurement process from being overlapped and be generated by the way of in parallel
Crosstalk, reduce measurement error.Realize real-time, the quasi-distributed measurement of ocean temperature section, and high certainty of measurement, equipment
Failure rate is low.
Description of the drawings
The invention will be further described below in conjunction with the accompanying drawings.
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 the index path of the present invention；
Fig. 6 is FBG reflectance spectrum schematic diagrames；
Fig. 7 is optical fiber F-P pressure sensor reflectance spectrum schematic diagram.
In figure respectively marked as：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 sensors, 11, no
Become rusty steel sheel, 12, grating sealing bolt, 13, stainless steel wire mesh grid, 14, fluid sealant, 15, optical fiber F-P pressure sensor, 16,
Capillary quartz ampoule, 17, silicon base, 18, high-reflecting film, 19, presser sensor silicon chip.
Specific implementation mode
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 transmission cable 1 and the vulcanization of part Stainless Steel Shell 11 are fixed, while to ensure fiber F-P pressure sensing in warm deep sensing unit
For the measurement end and FBG temperature sensors of device other than vulcanized rubber protection pipe, vulcanized rubber protection pipe is same protection fusion point
When fix the deep sensing unit of temperature.In the present embodiment, the deep sensing unit of 12 temperature is one group, and one 24 is connected to 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, optical fiber ointment is filled in pipe.It is identified using different colours outside stainless steel tube.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 pipes, FBG temperature
Degree sensor 10 is bonded in by epoxy resin 9 on stainless steel stent 8, 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 fluid sealant 14；11 outside of Stainless Steel Shell covers threaded stainless steel wire mesh grid 13；In twin fiber cable 4
Optical fiber 6 pass through FBG temperature sensors 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 with thread seal by sealing rubber ring 7, center hole part encrypts sealing waterproof.
FBG temperature sensors are fiber-optic grating sensor, it is with external parameter using fiber bragg grating center wavelength at one
The principle of fixed functional relation, by detecting the variation of wavelength to obtain a kind of sensor of external environment parameters.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, easily forms sensing network.Fiber bragg grating (FBG) had both may be used in temperature sensor,
Long-period fiber grating (LPG) can also be used.
Optical fiber F-P pressure sensor is based on F-P interferometer principles, using light between fiber end face and presser sensor diaphragm
Multiple roundtrip, so that the reflected light of fiber end face and the reflected light of presser sensor diaphragm is 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 of F-P cavity length can be measured by crossing the variation of detection interference spectrum, and then obtain the pressure value of seawater.Such sensor is to constituting
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 more than the diameter of capillary quartz ampoule 16；The quarter of groove
It is long equal to the chamber of EFPI sensors 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 plates
Plate high-reflecting film 18 in one end face of high-reflecting film, presser sensor silicon chip 19；High-reflecting film can be composite dielectric film；Silicon base 17 and pressure
Power sensitivity silicon chip 19 is connected by the way of anode linkage, and F-P cavity is formed between fiber end face and presser sensor silicon chip 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 etalons, optical branching device, fiber optical circulator, photoswitch, photoelectric detector, data collecting card and control unit group
At.
Wideband light source is the process amplification of C-band or C+L wave bands and gain flattening wideband light source, usually selects 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 is sent out incident tunable TEA CO2 laser after isolator, filters through tunable F-P
Narrowband light wave is formed after device, narrowband light wave is 99 through splitting ratio after image intensifer amplifies and is gain flattening：1 coupler
It is divided into two ways of optical signals, the optical channel that accounting is 1%, which is used as, refers to channel, and reference optical signal is through F-P etalons and Photoelectric Detection
It is acquired by data collecting card after device；It is sensing passage all the way that accounting, which is 99%, and sensing optical signal through 1 × M optical branching devices is divided into M
Road optical signal connects 11 × N photoswitch through circulator again per road optical signal, and photoswitch is controlled by control unit.Due to every
A sensing unit is divided into temperature and depth survey two parts, and therefore, system can access altogetherA sensing unit, according to measurement
Demand selects suitable light source, optical branching device and photoswitch.
Signal is followed by warm deep sensing unit through photoswitch, and two sensing pathway of each deep sensing unit of temperature connect two respectively
The corresponding position of photoswitch ensures 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 centre wavelength of corresponding tunable TEA CO2 laser is the spectrum model when photoelectric detector exports maximum value
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.
The specific measuring process of the present invention is as follows：
A, laboratory temperature calibration is carried out to each FBG temperature sensors, 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：Pass through laboratory temperature
Calibration obtains pressure sensor and only considers the variation of F-P cavity length and pressure sensing when temperature influences at ambient pressure conditions
Device only considers the variation of F-P cavity length 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 on along sea water advanced direction in seawater；
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 diagrames, and FBG is a kind of fiber grating, and refractive index modulation depth and screen periods are general
All it is 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 measured by detecting reflectance spectrum bragg wavelength value using the coefficient of calibration.
Fig. 7 is the reflectance spectrum schematic diagram of optical fiber F-P pressure sensor in the present invention, and F-P pressure sensors are 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 more than the wavelength of light source
Range ensures that the interference spectrum being reflected back includes only a trough within the scope of optical source wavelength.It, can using the variation of wave trough position
To obtain the variation of EFPI chambers length.
The present invention is measured using fiber grating into trip temperature, 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, the component for contacting seawater use 316L stainless steel materials, corrosion resistance 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 some grating damages, other light
Grid remain to continue to measure.
Claims (10)
1. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor, characterized in that composition includes that wavelength value is adjustable
Narrow-band light source, photo-coupler, optical branching device, 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 etalons and photoelectricity
Detector is sent into data collecting card, and sense light is divided into multichannel through optical branching device, 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 after backtracking to circulator through photoelectric detector,
The data collecting card is connect with control unit.
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
The adjustable narrow-band light source of wavelength value includes wideband light source, isolator, tunable TEA CO2 laser and image intensifer, the broadband light
The optical signal of source output is sent into photo-coupler, the tunable F- through isolator, tunable TEA CO2 laser and image intensifer successively
The wavelength value control terminal of P filters is connect by data collecting card with control unit.
3. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor according to claim 1 or 2, characterized in that
The optical fiber temperature depth cable includes optical signal transmission cable (1) and is sensed deeply along multiple temperature that optical signal transmission cable (1) equidistantly arranges
Unit (2), each deep sensing unit (2) of temperature includes the Stainless Steel Shell (11) for carrying 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)
In centre bore, the FBG temperature sensors (10) are fixed on the inner wall of Stainless Steel Shell (11) simultaneously by stainless steel stent (8)
It is connect with an optical fiber in optical signal transmission cable (1) by an optical fiber in twin fiber cable (4), the fiber F-P pressure
Sensor (15) is fixed in the through-hole in Stainless Steel Shell (11) and is believed with light by another optical fiber in twin fiber cable (4)
Optical fiber connection in number transmission cable (1).
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
Optical fiber F-P pressure sensor (15) includes capillary quartz ampoule (16), silicon base (17) and presser sensor silicon chip (19), the silicon substrate
Bottom (17) is located in the through-hole in Stainless Steel Shell (11) and is tightly connected by the hole wall of fluid sealant (14) and through-hole, in silicon substrate
Bottom (17) is equipped with the groove covered by presser sensor silicon chip (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 chip (19) and presser sensor silicon chip (19) and optical fiber phase
To be equipped with high-reflecting film (18) on one side.
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
Stainless Steel Shell (11) is equipped with through-hole corresponding with FBG temperature sensors (10), and the through-hole is by grating sealing bolt (12)
Sealing.
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
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).
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
Optical signal transmission cable (1) includes more stainless steel tubes and Duo Gen single mode optical fibers, the more twisted strandings of stainless steel tube, every stainless steel
A single mode optical fiber is penetrated in pipe, and optical fiber ointment is filled between the single mode optical fiber and stainless steel tube.
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
Warm depth sensing unit (2) is wrapped up by vulcanized rubber protection pipe (3) on optical signal transmission cable (1).
9. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor according to claim 8, 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.
10. a kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor according to claim 9, characterized in that institute
It states and is connected through a screw thread between sealing cover (5) and Stainless Steel Shell (11), be additionally provided with sealing rubber ring (7) between.
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