CN201765352U - Sea water temperature profile measuring optical cable based on optical fiber Brillouin scattering principle - Google Patents
Sea water temperature profile measuring optical cable based on optical fiber Brillouin scattering principle Download PDFInfo
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- CN201765352U CN201765352U CN2010201930471U CN201020193047U CN201765352U CN 201765352 U CN201765352 U CN 201765352U CN 2010201930471 U CN2010201930471 U CN 2010201930471U CN 201020193047 U CN201020193047 U CN 201020193047U CN 201765352 U CN201765352 U CN 201765352U
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Abstract
The utility model relates to a sea water temperature profile measuring optical cable based on optical fiber Brillouin scattering principle, comprising a dual-buckle stainless steel hose as well as a temperature sensing sub-optical cable and a pressure sensing sub-optical cable that are arranged in the dual-buckle stainless steel hose; the temperature sensing sub-optical cable comprises a temperature sensing optical fiber and a stainless steel sleeve sheathed outside the temperature sensing optical fiber; the pressure sensing sub-optical cable comprises a pressure sensing optical fiber as well as a spring tube and a stainless steel mesh grid sheathed outside the pressure sensing optical fiber in sequence; the surface of the pressure sensing optical fiber is coated with a polyurethane pressure sensitive material layer. The sea water temperature profile measuring optical cable based on optical fiber Brillouin scattering principle has small volume, convenience in use, high reliability and measuring sensitivity, and is capable of providing continuous temperature field distribution of sea water profile; and the optical cable is particularly applicable to real-time continuous measurement on sea water temperature profile.
Description
Technical field
The utility model relates to a kind of optical cable that is used for measuring along depth direction the ocean temperature distribution situation, belongs to field of measuring technique.
Background technology
Ocean temperature is the important content in oceanographic survey, the monitoring, is indispensable technical parameter in marine hydrology, meteorological observation and the investigation.The measurement of ocean temperature section has crucial Practical significance to research Marine Sciences, marine environmental monitoring, seasonal climate prediction and sea fishery etc.So-called seawater temperature profile measurement is meant along depth direction measures the ocean temperature distribution situation, promptly provides the temperature information at the depth of water and respective depth place, and long-time real-time monitored also will provide corresponding observation time.
The major equipment that is used for seawater temperature profile measurement both at home and abroad is ocean, a thermohaline deep-sea visualizer (CTD), and instrument mainly is equipped with the electronic surveying circuit by temperature, salinity and three kinds of sensors of pressure and constitutes.It with electronic part encapsulations such as data acquisition unit, data transmission unit and power supplys in high-intensity pressure vessel.CTD thermometric degree of accuracy can reach 0.001 ℃ of grade, and it patrols thermometric degree, salinity and the degree of depth by hanging in the different depth pointwise, and shortcoming is to realize the variation of real-time and long-time simultaneous observation temperature profile.
Chinese patent CN2154470Y, open day be that the patent that January 26 in 1994, day, were called " seawater temperature sensor chain " has proposed the quasi-distributed sensor chain structure of a kind of many linear transducer arrays type, its structure comprises temperature sensor, pressure transducer, float, wirerope, hangs steel column, load-bearing steel column and shielded cable.Wherein, the encapsulation type thermistor temperature sensor is embedded on the float, and float is configured on the wirerope with 5cm to 100cm spacing, and the two ends of wirerope are locked in the steel bowl of hanging steel column and load-bearing steel column with wirerope steel bushing and wire fixture respectively.Pressure transducer is fixed on the top of the load-bearing steel column of thermistor chain lower end, and the shielded cable of a branch of 33 each 50m length is passed by the center pit of float, as transmission cable.
In addition, the SEAGUARD sensor chain system of Norway AANDERAA company adopts the quasi-distributed sensor chain structure of many linear transducer arrays type, can be used for measuring ocean environment parameters such as dissolved oxygen DO, conductivity, temperature, electric current, pressure and morning and evening tides, the basic element of character comprises sensor chain and registering instrument.This system can adopt the self-tolerant working method, and each back opening entry measurement data of throwing in after measurement after a while, is salvaged the water surface, and the storage data of extracting in the registering instrument are carried out analyzing and processing.If apolegamy is gathered in real time and the communications accessory also can be realized real-time measurement.This system can establish 25 measurement points, adopts sensor chain stationary fixture fixation of sensor at each measurement point, can fix 2 sensors in each anchor clamps.300 meters of sensor chain length overall Ke Da, system adopts the encapsulation type thermistor temperature sensor.
Though more than two kinds of quasi-distributed sensor chain structures overcome CTD and can only pointwise patrol the shortcoming of surveying and can not measuring in real time, temperature chain volume is huge, is inconvenient to use the winch folding and unfolding; The measured node quantity of total system is limited by power supply capacity, is difficult to satisfy spatial resolution height (observer nodes is intensive) and the big application requirements of the scope that fathoms; Anti-interference and shielding problem in electrical isolation in the needs consideration seawater and the electric signal transmission course; Can only measure fixing spatial point position temperature and depth information, can not implementation space continuous distribution formula truly measure.
Distribution type fiber-optic Brillouin sensing technology is a kind of novel measuring technique, and only having needs one-shot measurement can obtain along distinct advantages such as continuous distribution information, measuring accuracy height, accurate positioning, the distance sensing of tested of whole optical fiber are far away.Adopt distribution type fiber-optic Brillouin sensing technology to realize that seawater temperature profile measurement need use special optical cable, specific (special) requirements such as this optical cable should be able to satisfy the tolerance marine corrosion, have good tension and compressive property, volume is little, in light weight, be easy to lay; In addition, because the influence of ocean current, optical cable can not keep desirable perpendicular attitude, and the depth of water of its length and reality is also inconsistent, so require seawater temperature profile measurement optical cable sense temperature and corresponding Water Depth Information simultaneously.But existing optical cable can not satisfy above application demand.
The utility model content
The purpose of this utility model is to provide a kind of volume little, easy to use, and reliability and measurement are highly sensitive, and can provide the seawater temperature profile measurement optical cable based on the optical fiber Brillouin scattering principle of the continuous temperature field distribution of seawater section.
The alleged purpose of the utility model realizes with following technical proposals:
A kind of seawater temperature profile measurement optical cable based on the optical fiber Brillouin scattering principle, form by two button stainless steel flexible hoses and the sub-optical cable of temperature inside sensing thereof and the sub-optical cable of pressure sensing, the sub-optical cable of described temperature sensing is by temperature sensing optical fiber and be sleeved on its outside stainless steel sleeve pipe and form, the sub-optical cable of described pressure sensing is by pressure sensing optical fiber and be sleeved on its outside bourdon tube successively and the stainless steel wire mesh grid is formed, and described pressure sensing optical fiber surface is coated with polyurethane pressure sensitive material layer.
Above-mentioned seawater temperature profile measurement optical cable based on the optical fiber Brillouin scattering principle, the temperature sensing optical fiber in the sub-optical cable of described temperature sensing is provided with 2～4.
Above-mentioned seawater temperature profile measurement optical cable based on the optical fiber Brillouin scattering principle, the sub-optical cable of described pressure sensing is provided with two.
Above-mentioned seawater temperature profile measurement optical cable based on the optical fiber Brillouin scattering principle is at the periphery coated with thermally conductive ointment layer of temperature sensing optical fiber.
The utility model is applied to advanced person's distribution type fiber-optic Brillouin sensing technology the real-time monitoring of ocean temperature section, during measurement optical cable is vertically put into seawater, end from optical fiber sends light pulse then, because the frequency displacement of optical fiber Brillouin scattered signal is the function of temperature and strain (corresponding different sea water advanced static pressures), the frequency displacement of measuring optical fiber diverse location Brillouin scattering can realize the measurement of ocean temperature and pressure distribution.Bulky, the problem that can not realize continuous monitoring of using that this optical cable measures that ocean temperature can solve well that existing temperature chain exists, and can provide the continuous temperature field distribution of seawater section.Two button stainless steel flexible hoses have good tension and lateral pressure resistant performance, are used for load-bearing so that make optical cable transfer to projected depth, are easy to lay; Adopt the stainless steel sleeve pipe to have the anti-simultaneously seawater pressure of good temperature-sensitive performance, entry terminal water-tight during use makes temperature sensing optical fiber not affected by force, improves thermometric precision; The polyurethane pressure sensitive material has higher pressure sensitivity, can improve spatial resolution when being used for bathymetric survey, proofreaies and correct optical cable and tilts for the influence of temperature-measuring results because of ocean current.Bourdon tube and stainless steel wire mesh grid are used to strengthen the physical strength of optical fiber; Standby many temperature sensing optical fiber and the sub-optical cable of pressure sensing can improve the reliability of optical cable, prolong the serviceable life of optical cable.Other parts beyond the optical fiber all adopt the stainless steel metal structure, are easy to dry, and are anticorrosive.
The utlity model has seawater corrosion resistance, have good tension and compressive property, volume is little, in light weight, be easy to lay, adopt optical signal transmission needn't consider in electrical isolation in the seawater and the electric signal transmission course anti-interference and shielding problem, can the dynamic change of real-time and long-time simultaneous observation temperature profile, the spatial point continuous coverage distributed fully, can measure temperature and advantage such as sea water advanced simultaneously, the real-time continuous that is specially adapted to the ocean temperature section is measured.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is a sectional view of the present utility model;
Fig. 2 is Brillouin's temperature and strain measurement principle three-dimensional curve diagram (shown among the figure when the temperature stepped change, along the Brillouin spectrum of 150m sensor fibre, shown the temperature variant skew of centre frequency (Brillouin shift) of Brillouin's spectrum).
Each label is among the figure: 1, two button stainless steel flexible hoses, 2, temperature sensing optical fiber, 3, the stainless steel sleeve pipe, 4, the stainless steel wire mesh grid, 5, bourdon tube, 6, pressure sensing optical fiber, 7, polyurethane pressure sensitive material layer.
Embodiment
This optical cable is applicable to the seawater temperature profile measurement system of optical fiber Brillouin principle, system is based on Brillouin light Time Domain Reflectometry (BOTDR) or Brillouin optical time domain analysis (BOTDA) measuring principle: during measurement the Brillouin shift detecting instrument is installed in oceanographic buoy, boats and ships or offshore oil platform, sensing optic cable is vertically put into seawater, send light pulse from an end of optical fiber, in fiber medium, produce Brillouin scattering, temperature and pressure can cause that all the frequency displacement of Brillouin scattering changes, Fig. 2 is a kind of embodiment (is stepped appearance along the Temperature Distribution of fiber lengths by 5 intervals and changes, have nothing in common with each other corresponding to the Brillouin shift of each interval peak light strength).The degree of depth of seawater is embodied by the hydrostatic pressing measured value of seawater, is obtained by the sub-optical cable of pressure sensing in the present embodiment.The temperature of seawater is obtained by the sub-optical cable of temperature sensing.Utilize the Brillouin shift detector to measure the frequency displacement numerical value of each sub-optical cable along each scattering point of fiber length.Measure equation is:
v
B1(T)＝v
B1(T
r)[1+C
vT1(T-T
r)] (1)
v
B2(T，P)＝v
B2(T
r，P
r)[1+C
vP(P-P
r)+C
vT2(T-T
r)] (2)；
Wherein, T, P difference representation temperature, pressure; T
r, P
rBe respectively reference temperature, reference pressure; v
B1(T) and v
B1(T
r) be respectively the sub-optical cable of temperature at temperature T and T
rThe time corresponding Brillouin shift; For the sub-optical cable of temperature sensing because the strain that brings of seawater pressure of having adopted the stainless steel sleeve tube shield, Brillouin shift only and temperature correlation, C
VT1Temperature sensing coefficient for the sub-optical cable of temperature; v
B2(T, P) and v
B2(T
r, P
r) be respectively the corresponding Brillouin shift of the sub-optical cable of pressure when temperature T, pressure P and reference temperature, reference pressure; C
VT2, C
VPBe respectively the temperature and pressure transduction factor of the sub-optical cable of pressure.By the system chamber of experimentizing being calibrated to determine coefficient C
VT1, C
VT2, C
VP
Concrete calibration process is as follows:
(1) laboratory temperature is demarcated: get sensing optic cable sample (being no less than 15 meters in the present embodiment) and put into attemperating unit and carry out temperature value calibration normal pressure (reference pressure) under, at first regulate attemperating unit to 35 ℃, successively decrease with the temperature interval of setting then, up to-2 ℃.The demarcation of temperature is determined according to actual measurement requirement at interval, according to the temperature gradient distribution rule of 300 meters seawater, sets series and demarcates temperature value in the present embodiment: 35 ℃, and 25 ℃, 15 ℃, 5 ℃ ,-2 ℃.Here getting reference temperature is 25 ℃.Adopt the Brillouin shift detecting instrument to measure the Brillouin shift v of temperature sensing optical fiber under corresponding each temperature spot T
B1(T), thus same temperature spot measure down repeatedly to nominal data (v
B1(T), repeatedly measured value T) averages to obtain better repeatability and precision, with each temperature value T and corresponding Brillouin shift v thereof
B1(T) mean value carries out linear fit according to formula (1) and finds the solution coefficient C
VT1Because normal pressure is measured down, P-P in the formula (2)
r=0, adopt the Brillouin shift detecting instrument to measure the Brillouin shift v of corresponding each temperature spot T downforce sensor fibre
B2(T, P
r), thereby same temperature spot is measured repeatedly to nominal data (v down
B2(T, P
r), repeatedly measured value T) averages to obtain better repeatability and precision, with each temperature value T and corresponding Brillouin shift v thereof
B2(T, P
r) mean value carries out linear fit according to formula (2) and find the solution coefficient C
VT2.
(2) laboratory pressure calibration: get sensing optic cable sample (being no less than 15 meters in the present embodiment) and put into pressure and regulate container and carry out the calibration of normal temperature (reference temperature) downforce value, at first regulating force value is 0MPa, increase progressively with the pressure intervals of setting then, up to 3MPa.Demarcate at interval and determine, set serial calibration value: 0MPa, 0.5MPa, 1MPa, 1.5MPa, 2MPa, 2.5MPa, 3MPa in the present embodiment according to actual measurement requirement.Because normal temperature is measured down, T-T in the formula (2)
r=0, adopt the Brillouin shift detecting instrument to measure the Brillouin shift v of corresponding each pressure P point downforce sensor fibre
B2(T
r, P), thereby same spot pressure is measured repeatedly to nominal data (v down
B2(T
r, P), repeatedly measured value P) averages to obtain better repeatability and precision, with each pressure value P and corresponding Brillouin shift v thereof
B2(T
r, P) mean value carries out linear fit according to formula (2) and finds the solution coefficient C
Vp.
During actual measurement, send light pulse from an end of sensor fibre constantly, begin to receive a series of backscattering pulse echo at the transmitting terminal of light from t=0 at t=0.Just can determine corresponding scattering point position in the optical fiber, the fiber lengths between this position reflection scattering point and the incident light by measuring time interval between these pulse echos and the input optical pulse.Adopt the Brillouin shift detecting instrument to measure the Brillouin shift v of the sub-optical cable of temperature sensing along the pulse echo of fiber lengths distribution
B1(T), demarcate temperature coefficient C by the laboratory
VT1, can find the solution Temperature Distribution along fiber lengths according to formula (1).For the sub-optical cable of pressure sensing, its Brillouin shift comprises two parts: the frequency displacement that frequency displacement that temperature variation is introduced and hydrostatic pressing are introduced.The Temperature Distribution numerical value that the sub-optical cable of temperature sensing is recorded, adopt the Brillouin shift v of the pulse echo that the sub-optical cable of pressure sensing that the Brillouin shift detecting instrument measures distributes along fiber lengths along cable length
B2(T, P), laboratory calibration coefficient C
VT2And C
VPSubstitution formula (2), find the solution hydrostatic force distribution, the relation of pressure corresponding depth along fiber lengths: common 100 meters corresponding 1MPa, and then acquisition is along the sea water advanced information of fiber lengths.Finally draw out temperature-depth curve by above measured value.
Utilize the attitude of the utility model optical cable can also provide the ocean current distribution situation of coastal water depth direction, the relation that the sub-optical cable of fiber lengths and pressure is measured between sea water advanced promptly reflects the attitude of optical cable.
Main making step of the present utility model comprises:
1, temperature sensing optical fiber 2 coated with thermally conductive ointment (reducing the optical fiber wearing and tearing when improving temperature control) coat stainless steel sleeve pipe 3 then, make the sub-optical cable of temperature sensing;
2, pressure sensing optical fiber 6 is applied polyurethane pressure sensitive material layer 7, the sub-optical cable of pressure sensing (two) is made in outsourcing bourdon tube 5 and stainless steel wire mesh grid 4 then;
3, three strip optical cables are twisted the coiled one so that improve counter-bending ability, the two button of outsourcing stainless steel flexible hoses 1 are made the utility model optical cable then.Attention: earlier with the slight strand of the sub-optical cable of temperature sensing around, windings of again two sub-optical cables of pressure sensing being taken advantage of a situation, defence damage polyurethane pressure sensitive material layer 7.
Cable outer diameter is 10～12mm in the present embodiment, and the resistance to tension maximum can reach 3000 newton, and cable length can reach 350 meters.Two button stainless steel flexible hoses 1 are that the steel band of 0.2～0.3mm is made by thickness.The about 3mm of stainless steel sleeve pipe 3 overall diameters of the sub-optical cable of temperature sensing, thick 0.2mm.The pressure sensitive material that the sub-optical cable of pressure sensing applies requires low Young modulus and higher Poisson ratio (to be respectively 8*10 in the present embodiment
7Pa and 0.4).The naked fibre of the remolding sensitivity of the sub-optical cable of pressure sensing has improved 2～3 orders of magnitude.Stainless steel wire mesh grid (4) adopts the STAINLESS STEEL WIRE braiding of diameter 0.2mm to form; Lateral pressure resistant bourdon tube (5) adopts close the turning to of stainless steel wire of diameter 1mm.
During concrete enforcement, the temperature sensing optical fiber 2 in the sub-optical cable of temperature sensing is bonding by certain spaced points and stainless steel sleeve pipe 3 inwalls in the whole length range of optical fiber along axis direction, guarantee that the optical fiber between the adhesive spots is in the state that freely relaxes.Each parts of the sub-optical cable of pressure also select spaced points bonding, the deadweight of being born sub-optical cable by stainless steel wire mesh grid 4.
Claims (4)
1. seawater temperature profile measurement optical cable based on the optical fiber Brillouin scattering principle, it is characterized in that, it is made up of two button stainless steel flexible hoses (1) and the sub-optical cable of temperature inside sensing thereof and the sub-optical cable of pressure sensing, the sub-optical cable of described temperature sensing is by temperature sensing optical fiber (2) and be sleeved on its outside stainless steel sleeve pipe (3) and form, the sub-optical cable of described pressure sensing is by pressure sensing optical fiber (6) and be sleeved on its outside bourdon tube (5) successively and stainless steel wire mesh grid (4) is formed, and described pressure sensing optical fiber (6) surface-coated has polyurethane pressure sensitive material layer (7).
2. according to the described seawater temperature profile measurement optical cable of claim 1, it is characterized in that the temperature sensing optical fiber (2) in the sub-optical cable of described temperature sensing is provided with 2～4 based on the optical fiber Brillouin scattering principle.
3. according to the described seawater temperature profile measurement optical cable of claim 2, it is characterized in that the sub-optical cable of described pressure sensing is provided with two based on the optical fiber Brillouin scattering principle.
4. according to the described seawater temperature profile measurement optical cable of claim 3, it is characterized in that, at the periphery coated with thermally conductive ointment layer of temperature sensing optical fiber (2) based on the optical fiber Brillouin scattering principle.
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| CN2010201930471U CN201765352U (en) | 2010-05-18 | 2010-05-18 | Sea water temperature profile measuring optical cable based on optical fiber Brillouin scattering principle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201930471U CN201765352U (en) | 2010-05-18 | 2010-05-18 | Sea water temperature profile measuring optical cable based on optical fiber Brillouin scattering principle |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759845A (en) * | 2014-01-22 | 2014-04-30 | 中国科学院半导体研究所 | Pull-type optical fiber temperature depth profile continuous measurement system |
| CN104792437A (en) * | 2015-04-21 | 2015-07-22 | 国家海洋技术中心 | Optical expandable ocean temperature and depth profile measuring probe |
| CN111980684A (en) * | 2019-05-05 | 2020-11-24 | 中国石油天然气股份有限公司 | Continuous tube temperature and pressure monitoring optical cable and manufacturing method thereof |
| EP3767356A1 (en) | 2019-07-17 | 2021-01-20 | Prysmian S.p.A. | Multisensing optical fiber cable |
| EP4024106A1 (en) | 2020-12-31 | 2022-07-06 | Prysmian S.p.A. | Multisensing optical fiber cable |
| US20230085614A1 (en) * | 2020-02-13 | 2023-03-16 | Nippon Telegraph And Telephone Corporation | Device and method for detecting inundation of optical fiber |
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2010
- 2010-05-18 CN CN2010201930471U patent/CN201765352U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759845A (en) * | 2014-01-22 | 2014-04-30 | 中国科学院半导体研究所 | Pull-type optical fiber temperature depth profile continuous measurement system |
| CN103759845B (en) * | 2014-01-22 | 2017-02-08 | 中国科学院半导体研究所 | Pull-type optical fiber temperature depth profile continuous measurement system |
| CN104792437A (en) * | 2015-04-21 | 2015-07-22 | 国家海洋技术中心 | Optical expandable ocean temperature and depth profile measuring probe |
| CN111980684A (en) * | 2019-05-05 | 2020-11-24 | 中国石油天然气股份有限公司 | Continuous tube temperature and pressure monitoring optical cable and manufacturing method thereof |
| CN111980684B (en) * | 2019-05-05 | 2023-09-26 | 中国石油天然气股份有限公司 | Coiled tubing temperature and pressure monitoring optical cable and manufacturing method thereof |
| EP3767356A1 (en) | 2019-07-17 | 2021-01-20 | Prysmian S.p.A. | Multisensing optical fiber cable |
| US20230085614A1 (en) * | 2020-02-13 | 2023-03-16 | Nippon Telegraph And Telephone Corporation | Device and method for detecting inundation of optical fiber |
| US11747294B2 (en) * | 2020-02-13 | 2023-09-05 | Nippon Telegraph And Telephone Corporation | Water immersion detection device and water immersion detection method for detecting inundation of optical fiber |
| EP4024106A1 (en) | 2020-12-31 | 2022-07-06 | Prysmian S.p.A. | Multisensing optical fiber cable |
| US11714245B2 (en) | 2020-12-31 | 2023-08-01 | Prysmian S.P.A. | Multisensing optical fiber cable |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110316 Termination date: 20140518 |