CN109253820A - A kind of water environment temperature gradient monitoring device and method based on dim light grid - Google Patents
A kind of water environment temperature gradient monitoring device and method based on dim light grid Download PDFInfo
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- CN109253820A CN109253820A CN201811184887.9A CN201811184887A CN109253820A CN 109253820 A CN109253820 A CN 109253820A CN 201811184887 A CN201811184887 A CN 201811184887A CN 109253820 A CN109253820 A CN 109253820A
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Abstract
A kind of water environment temperature gradient monitoring device and method based on dim light grid, including dim light grid demodulation module are transmitted for the generation of light pulse signal, reception, demodulation, record and data；Dim light grid temperature sensing optical cable is formed by being carved with the optical fiber armoured of dim light grid array, can be used as the transmission of optical signal and the induction medium of temperature environment；Data processing and communication terminal, for sending operational order to grating and handling return data；Monitoring method of the invention are as follows: the Bragg peak wavelength and environment temperature of superweak fiber grating reflection are linearly related, based on this, establish the calibration curve of " temperature-peak wavelength ", by successively inquiring the drift value of Bragg grating peak wavelength in different spatial, the fast accurate ground corresponding water temperature value of inverting.The present invention overcomes deficiency of the existing water temperature detection equipment in measurement density, measurement accuracy and real-time; have many advantages, such as that distributed, high-precision, response are fast, there is important application value in water project operation, environmental protection, aquatic product fishery, the navigation channel field Wei Guandeng.
Description
Technical field
The present invention relates to optical fiber sensing fields, and in particular to a kind of water environment temperature gradient monitoring based on dim light grid
Device and method.
Background technique
Water temperature is the fundamental physical quantity for characterizing water body heat spatial and temporal distributions, is an important water body environment parameter.To water
Temperature carries out real-time high-precision measurement, in fields such as water project operation, environmental protection, aquatic product fishery, navigation channel dimension pipe, waterwork addressings
It is of great significance.Studies have shown that the effects of solar radiation, waste heat discharge, waterwork retardance, often enables big depth water body
There is the phenomenon that water temperature delamination distribution in (such as river, Hu Bo, reservoir, ocean etc.), this greatly affected the associated production of the mankind
Practical activity.For example, river upstream silt evolutionary process of building a dam has substantial connection with temperature of river water layering；It sluices under large reservoir
Water temperature downstream ecology environment can be had an important influence on；Nuclear power station waste heat discharge can make discharge outlet, and nearby water temperature is increased and then is made
At microorganism enrichment etc..It is high that these phenomenons require that people can simultaneously realize water temperature on the different depth of a certain water body section
Precision intensively monitors, and then instructs associated production practical activity.Existing water temperature detection equipment often be faced with measurement accuracy it is low,
The problems such as time-consuming, closeness is low.Develop that a kind of high-precision, distribution, quickly and easily water temperature gradient monitoring device will be
Related fields generates important application value.
Optical fiber, can not only be used for the transmission channel of optical signal, also can be used as environment parameter (such as temperature, stress, vibration)
Induction medium has many advantages, such as small in size, light-weight, easy laying, electromagnetism interference, is widely used in sensory field.It is existing
Some optical fiber water temperature detection equipment can be divided into two major classes: the distribution type fiber-optic prison based on scattering (Raman scattering or Brillouin scattering)
Measurement equipment and the fiber-optic monitoring equipment for being based on high reflectance grating (FBG).Often there is rate of false alarm height in the former, positioning accuracy is poor,
The problems such as anti-interference ability is weak, and data demodulation is complicated.The latter is depicted on optical fiber with the period by particular technology means
Property structure high reflectance grating, the characteristic for utilizing optical grating construction sensitive to environmental parameter variation realizes water temperature detection.But it is common
The reflectivity of grating is high, and grating multiplexing number is few, and spatial resolution is often restricted, in addition, common grating mostly uses stripping
Skin is coated with after inscribing, and coating uniformity is poor, and temperature linearity degree is bad, is difficult meet the needs of high-precision temperature monitoring.It is superweak
Fiber grating refers to the fiber grating (reflectivity of usual grating is lower than 0.1%) with extremely low reflectivity, single light pulse letter
, can be through a large amount of superweak fiber grating when number propagating in a fiber, and successively leave reflection signal.These reflection signals
Although absolute intensity less, is really enough to be collected and detected by existing photoelectric detector.Therefore, by high in an optical fiber
Density inscribes dim light grid, and then constitutes superweak optical fiber optical grating array, can greatly improve the density of effective sensing unit.This
Outside, wavelength-division multiplex technique is introduced in superweak fiber grating, can be further improved sensing density, this is terraced to carry out water environment temperature
The sensing of degree provides solid physical basis.
In conclusion designing a kind of water environment temperature gradient monitoring device based on dim light grid and method will be with great
Application potential.The relevant technologies are had no at present.
Summary of the invention
For overcome the shortcomings of existing water temperature detection equipment detect density, in terms of.The present invention provides one
Kind of water environment temperature gradient monitoring device and method based on dim light grid, overcome existing water temperature detection equipment measurement density,
Deficiency in measurement accuracy and real-time has many advantages, such as that distributed, high-precision, response are fast；It is protected in water project operation, environment
Shield, aquatic product fishery, the navigation channel field Wei Guandeng have important application value.
The technical scheme adopted by the invention is as follows:
A kind of water environment temperature gradient monitoring device based on dim light grid, including dim light grid temperature sensing optical cable, weak grating demodulation
Module, data processing and communication terminal；
One end of the dim light grid temperature sensing optical cable is connected with the dim light grid demodulation module, the other end be dipped vertically into
It surveys in water environment, for sensing the water temperature of different depth in water environment.
The dim light grid demodulation module is connected with one end of dim light grid temperature sensing optical cable, anti-for demodulating dim light grid array
The wavelength change penetrated.
The data output of the data processing and communicating terminal and dim light grid demodulation module passes through wired or wireless
Mode be connected, the processing of wavelength data obtains the temperature gradient information of water environment, and connect with outer net.
The dim light grid temperature sensing optical cable includes dim light grid array, and fixed guide wire, covers in dim light grating array with dim light grid
Plastic tube outside column and guide wire, plastic tube are coated with braiding layer.
Multiple complete same or wavelength-division multiplex antiradar reflectivity optical fiber optical grating arrays are carved on the dim light grid array, use is non-
Peeling technique is inscribed, and the coat of grating array is modified acrylate layer or saturating ultraviolet coat, and thickness is about 20um.
The guiding linear diameter about 0.5mm~1mm, the guide wire after applying pretension with the optical fiber optical grating array
Interval is fixed, and is divided into 30cm between fixed point.
Described sleeve pipe empty set in the periphery of the special optical fiber grating array and the guide wire, casing inner diameter 2.0mm~
3.0mm, outer diameter 4.0mm~5.0mm, with a thickness of 2mm.
The dim light grid temperature sensing optical cable tail portion is connected with the weight with depth of water sensing function, for feeding back temperature-sensitive institute thermometric
The depth of water at degree corresponds water environment temperature and the depth of water.
The dim light grid temperature sensing optical cable is wound on turntable, is discharged by controlled motor, and the water depth sensor on weight can will be believed
Number it is transmitted to controlled motor, to adjust the release length of dim light grid temperature sensing optical cable.
The dim light grid demodulation module is that dim light is incident on after Electro-optical Modulation as light source using narrow band scanning laser
In fine grating array, the signal light of weak optical fiber Bragg grating array reflection is acquired by high-speed collection card, filters out non-grating using algorithm
Reflected light, extract the reflection signal of each grating, be fitted by wavelength, obtain weak optical fiber Bragg grating array in each grating peak
It is worth wavelength.
The dim light grid demodulation module is on buoy or by manually laying or being scheduled on dam body or bank；Data
Processing and communication terminal with being disposed along bank base, are connect by Ethernet or WIFI or GPS with communication network.
A kind of water environment temperature gradient monitoring method based on dim light grid, comprising the following steps:
Temperature calibration: step 1 demarcates the reflection wavelength of used weak optical fiber Bragg grating using high-precision dot measurement thermometer
The relationship of drift value and absolute temperature obtains " temperature-wavelength " calibration curve；
Step 2: dim light grid temperature sensing optical cable is laid: the monitoring device of water environment temperature gradient being moved to waters to be measured, is controlled
Extension and retraction system processed slowly places dim light grid temperature sensing optical cable, guarantees the vertical runs of dim light grid temperature sensing optical cable；
Step 3: grating positioning: dim light grid demodulation module issues continuous laser, and light pulse is formed after ovennodulation, couples
Into dim light grid temperature sensing optical cable, the wavelength of continuous laser successively increases according to specified interval；The optical pulse strikes of different wave length
On the different grating in spatial position, the time for reaching detector after reflection is different, calculates by wavelength and time, in conjunction with auxiliary
The sounding mark helped establishes the relationship of stop position and the depth of water；
Step 4: temperature measurement:
(1) according to the wavelength information for obtaining different location grating in step 3, calibration file is established, and be stored at data
It manages in module；
(2) wavelength of continuous wave laser is resetted, again scanning wavelength, records the reflective information of corresponding position grating, passes through
Algorithm fitting, obtains the grating wavelength at current time, is stored in data processing module.
(3) it repeats previous action n-1 times, the peak wavelength data measured every time is saved, array is established.
(4) algorithm process is carried out to the data of n times measurement, obtains the normalization wavelength value of Millisecond in current slot；
(5) in data processing and the pre-set algorithm of communication terminal, by the temperature-for currently normalizing wavelength value and calibration
Wavelength curve, the distribution of water temperature of inverting different location optical grating point；
Step 5: circulation measurement: repeating said steps four obtain the temperature of different depth position in subsequent time water environment
Value；
Step 6: the building of water environment temperature gradient: it will be uploaded to data processing after the position of grating and Temperature Matching and lead to
Believe that terminal establishes the temperature gradient distribution of water environment by algorithm process.
A kind of water environment temperature gradient monitoring device and method based on dim light grid of the present invention, has the advantages that
1): the time-division/wavelength-division hybrid multiplex, the density of sensing unit is big on water depth direction.
The ultra-low reflectance characteristic of superweak fiber grating allows light pulse continuously to penetrate thousands of gratings, and successively produces
Raw reflection signal, the spatial resolution of time-division demodulation techniques is 2 meters at present；In conjunction with wavelength-division multiplex technique, by stages when each
Interior, the wavelength of wavelength-division multiplex 40, spatial resolution can achieve 0.05 meter again, and high density temperature on water depth direction may be implemented
Spend field sensing.
2): being easy to lay, networking is convenient.
For static reservoir, dim light grid temperature sensing optical cable is directly placed into water by weight, and temperature gradient can be realized
On-line monitoring；For flowing water domain, after dim light grid temperature sensing optical cable and auxiliary positioning cable machinery bondage, it is put into togerther in water, i.e.,
Temperature gradient monitoring can be achieved.Since fibre loss is low, signal propagation distance is remote, and Multi-point detection networking is convenient.
3): measurement accuracy height, fast response time.
Superweak fiber grating pair ambient temperature variation is very sensitive, this creates advantageous item for high-precision water temperature detection
Part.Reachable ± 0.05 DEG C of the water temperature detection precision of monitoring device and method of the invention.Further, since modulation /demodulation speed is fast,
Algorithm is flexible, and single query time is all in millisecond magnitude, far faster than traditional measurement method (hour grade).
4): cost performance is high.
Superweak fiber grating is identical as the inscription technology of ordinary optic fibre grating, when only accordingly reducing the exposure of single grating
Between, technology maturation, grating cost performance height.In addition, water environment temperature monitoring device of the invention is also only needed in a wide range of interior measurement
A set of demodulated equipment has good cost performance compared to more traditional single high-precision electronic measurement sensor.
Detailed description of the invention
Fig. 1 is apparatus of the present invention schematic diagram；
Wherein: 1 is data processing and communication terminal；2 be dim light grid demodulation module；3 be dim light grid temperature sensing optical cable；4 be to turn
Disk；5 be weight
Fig. 2 is dim light grid temperature sensing optical cable diagrammatic cross-section；
Wherein: 6 be braided fabric；7 casings；8 be dim light grid array；9 guide wires；
Fig. 3 is that embodiment schematic diagram is laid in present invention installation；
Wherein: 10 be to be fixed on buoy；11 be to be fixed on bank；
Fig. 4 is " temperature-wavelength " calibration curve figure of single dim light grid.
Specific embodiment
A kind of water environment temperature gradient monitoring device based on dim light grid, including dim light grid temperature sensing optical cable 3, weak grating demodulation
Module 2, data processing and communication terminal 1.
One end of the dim light grid temperature sensing optical cable 3 is connect with the dim light grid demodulation module 1, and the other end is dipped vertically into
In water environment to be measured, for dynamically sensing the water temperature of different depth in water environment.
The dim light grid demodulation module 2 is connect with 3 one end of temperature sensing optical cable, for demodulating the wave of the reflection of dim light grid array 8
Long variation；There are multiple demodulation channels on dim light grid demodulation module, multi-channel demodulator can be carried out, realize space division multiplexing.
The data processing and communication terminal 1 can by gigabit Ethernet into or 5G-WIFi and weak grating demodulation mould
Block 2 is attached, and the acquisition for wavelength data and the operation control to dim light grid demodulation module, data processing and communication are eventually
Water environment temperature gradient information is obtained after holding the wavelength data that will acquire to be handled, and terminal data is uploaded to by outer net
Library.
The dim light grid temperature sensing optical cable 3 includes dim light grid array 8, and the fixed guide wire with dim light grid array 8 covers dim light
The plastic tube of 9 outside of grid array 8 and guide wire, plastic tube outside is coated with braiding layer 6；
Inscribing on the dim light grid array 8 has multiple complete same or wavelength-division multiplex antiradar reflectivity optical fiber optical grating arrays,
It is inscribed using non-peeling technique, the coat of optical fiber optical grating array is modified acrylate layer or saturating ultraviolet coat, thickness
About 20um.
9 diameter of guide wire about 0.5mm~1mm, the guide wire 9 after applying pretension with the fiber grating battle array
The interval of column 8 is fixed, and is divided into 30cm between fixed point.
7 empty set of described sleeve pipe is in the periphery of the special optical fiber grating array 8 and the guide wire 9,7 internal diameter of casing
2.0mm~3.0mm, outer diameter 4.0mm~5.0mm, with a thickness of 2mm.Casing 7 uses plastic bushing.
3 tail portion of dim light grid temperature sensing optical cable is connected with the weight 5 with depth of water sensing function.
The dim light grid temperature sensing optical cable 3 is wound on turntable 4, is discharged by controlled motor, and the water depth sensor on weight 5 can incite somebody to action
Signal is transmitted to controlled motor, to adjust the release length of dim light grid temperature sensing optical cable 3.
The dim light grid demodulation module 2 is to be incident on after Electro-optical Modulation weak using narrow band scanning laser as light source
In optical fiber optical grating array 8, the signal light that weak optical fiber Bragg grating array 8 reflects is acquired by high-speed collection card, is filtered out using algorithm non-
The reflected light of grating is extracted the reflection signal of each grating, is fitted by wavelength, and each light in weak optical fiber Bragg grating array 8 is obtained
The peak wavelength of grid.
The dim light grid demodulation module 2 is on buoy 9 or by manually laying or being scheduled on dam body or bank 10；
Data processing and communication terminal 1 with being disposed along bank base, by Ethernet or WIFI or GPS are connect with communication network.
A kind of water environment temperature gradient monitoring method based on dim light grid, comprising the following steps:
Temperature calibration: step 1 uses the back wave of superweak fiber grating using high-precision dot measurement thermometer calibration
The relationship of long drift value and absolute temperature obtains " temperature-wavelength " calibration curve；
Step 2: dim light grid temperature sensing optical cable 3 is laid: the monitoring device of water environment temperature gradient is moved to waters to be measured,
Extension and retraction system is controlled, dim light grid temperature sensing optical cable 3 is slowly placed, guarantees the vertical runs of dim light grid temperature sensing optical cable 3；
Step 3: grating positioning: dim light grid demodulation module 2 issues continuous laser, and light pulse is formed after ovennodulation, couples
Into dim light grid temperature sensing optical cable 3, the wavelength of continuous laser successively increases according to specified interval；The light pulse of different wave length enters
It penetrates on the different grating in spatial position, the time for reaching detector after reflection is different, it is calculated by wavelength and time, in conjunction with
The sounding mark of auxiliary establishes the relationship of stop position and the depth of water；
Step 4: temperature measurement:
(1) according to the wavelength information for obtaining different location grating in step 3, calibration file is established, and be stored at data
It manages in module；
(2) wavelength of continuous wave laser is resetted, again scanning wavelength, records the reflective information of corresponding position grating, passes through
Algorithm fitting, obtains the grating wavelength at current time, is stored in data processing module.
(3) it repeats previous action n-1 times, the peak wavelength data measured every time is saved, array is established.
(4) algorithm process is carried out to the data of n times measurement, obtains the normalization wavelength value of Millisecond in current slot；
(5) in data processing and the pre-set algorithm of communication terminal 1, by the temperature for currently normalizing wavelength value and calibration
Degree-wavelength curve, the distribution of water temperature of inverting different location optical grating point；
Step 5: circulation measurement: repeating said steps four obtain the temperature of different depth position in subsequent time water environment
Value；
Step 6: the building of water environment temperature gradient: it will be uploaded to data processing after the position of grating and Temperature Matching and lead to
Believe that terminal 1 establishes the temperature gradient distribution of water environment by algorithm process.
" temperature-wavelength " calibration curves of single dim light grid as shown in figure 4, the temperature range of the calibration curve be 27 DEG C~
39℃.The wavelength with temperature linear change of weak optical fiber Bragg grating as seen from the figure, and the linearity is greater than 0.999, the temperature of the dim light grid
Sensitivity is 10.83pm/ DEG C, and temperature measurement precision is better than ± 0.05 DEG C, can satisfy extensive water environment temperature gradient monitoring
Requirement.
In conclusion a kind of water environment temperature gradient monitoring device and method based on dim light grid of the present invention, is based on grating
Reflecting light wavelength and environment temperature have strong characteristic, establish " temperature-peak wavelength " calibration curve, anti-by successively inquiring
Peak wavelength drift value is penetrated, the water temperature value of corresponding position has been measured to fast accurate.The present invention overcomes existing water temperature prisons
Deficiency of the measurement equipment in measurement density and measurement accuracy, have many advantages, such as distributed, high-precision, respond it is fast, water project operation,
Environmental protection, aquatic product fishery, the navigation channel field Wei Guandeng have important application value.
Claims (10)
1. a kind of water environment temperature gradient monitoring device based on dim light grid, it is characterised in that: including dim light grid temperature sensing optical cable
(3), dim light grid demodulation module (2), data processing and communication terminal (1)；
One end of the dim light grid temperature sensing optical cable (3) is connected with the dim light grid demodulation module (2), and the other end is dipped vertically into
In water environment to be measured, for dynamically sensing the water temperature of different depth in water environment；
The dim light grid demodulation module (2) connect with one end of dim light grid temperature sensing optical cable (3), for demodulating the reflection of dim light grid array
Wavelength change；
The data processing and communication terminal (1) are connect with dim light grid demodulation module (2) data output, for wavelength data
Processing, obtains the temperature gradient information of water environment, and connect with outer net.
2. a kind of water environment temperature gradient monitoring device based on dim light grid according to claim 1, it is characterised in that: described
Dim light grid temperature sensing optical cable (3) includes dim light grid array (8), and fixed guide wire (9), covers in dim light grid with dim light grid array (8)
Casing (7) outside array (8) and guide wire (9), casing (7) are coated with braiding layer (6).
3. a kind of water environment temperature gradient monitoring device based on dim light grid according to claim 1 or claim 2, it is characterised in that:
Multiple complete same or wavelength-division multiplex antiradar reflectivity optical fiber optical grating arrays are carved on the weak optical fiber Bragg grating array (8), using non-stripping
Skin technique is inscribed, and the coat of optical fiber optical grating array is modified polyacrylic acid ester layer or saturating ultraviolet coat.
4. a kind of water environment temperature gradient monitoring device based on dim light grid according to claim 1 or claim 2, it is characterised in that:
The guide wire (9) is spaced with the optical fiber optical grating array (8) after applying pretension and fixes.
5. a kind of water environment temperature gradient monitoring device based on dim light grid according to claim 2, it is characterised in that: described
Casing (7) empty set is in the periphery of the special optical fiber grating array (8) and the guide wire (9).
6. a kind of water environment temperature gradient monitoring device based on dim light grid according to claim 1, it is characterised in that: described
Dim light grid temperature sensing optical cable (3) tail portion be connected with the weight (5) with depth of water sensing function.
7. a kind of water environment temperature gradient monitoring device based on dim light grid according to claim 1, it is characterised in that: described
Dim light grid temperature sensing optical cable (3) is wound on turntable (4), is discharged by controlled motor, and the water depth sensor on weight (5) can pass signal
To controlled motor, to adjust the release length of dim light grid temperature sensing optical cable (3).
8. a kind of water environment temperature gradient monitoring device based on dim light grid according to claim 1, it is characterised in that: described
Dim light grid demodulation module (2) is that weak optical fiber Bragg grating battle array is incident on after Electro-optical Modulation as light source using narrow band scanning laser
It arranges in (8), the signal light of weak optical fiber Bragg grating array (8) reflection is acquired by high-speed collection card, filters out non-grating using algorithm
Reflected light is extracted the reflection signal of each grating, is fitted by wavelength, and each grating in weak optical fiber Bragg grating array (8) is obtained
Peak wavelength.
9. a kind of water environment temperature gradient monitoring device based on dim light grid according to claim 1, it is characterised in that: described
Dim light grid demodulation module (2) on buoy (10) or by manually laying or being scheduled on dam body or bank (11)；Data
Processing and communication terminal (1) with being disposed along bank base, are connect by Ethernet or WIFI or GPS with communication network.
10. a kind of water environment temperature gradient monitoring method based on dim light grid, it is characterised in that the following steps are included:
Temperature calibration: step 1 is drifted about using the reflection wavelength that high-precision dot measurement thermometer demarcates used weak optical fiber Bragg grating
The relationship of amount and absolute temperature obtains " temperature-wavelength " calibration curve；
Step 2: dim light grid temperature sensing optical cable (3) is laid: the monitoring device of water environment temperature gradient being moved to waters to be measured, is controlled
Extension and retraction system processed slowly places dim light grid temperature sensing optical cable (3), guarantees the vertical runs of dim light grid temperature sensing optical cable (3)；
Step 3: grating positioning: dim light grid demodulation module (2) issues continuous laser, forms light pulse after ovennodulation, is coupled into
Enter dim light grid temperature sensing optical cable (3), the wavelength of continuous laser successively increases according to specified interval；The light pulse of different wave length enters
It penetrates on the different grating in spatial position, the time for reaching detector after reflection is different, it is calculated by wavelength and time, in conjunction with
The sounding mark of auxiliary establishes the relationship of stop position and the depth of water；
Step 4: temperature measurement:
(1) according to the wavelength information for obtaining different location grating in step 3, calibration file is established, and be stored in data processing mould
In block；
(2) wavelength of continuous wave laser is resetted, again scanning wavelength, records the reflective information of corresponding position grating, passes through algorithm
Fitting, obtains the grating wavelength at current time, is stored in data processing module；
(3) it repeats previous action n-1 times, the peak wavelength data measured every time is saved, array is established；
(4) algorithm process is carried out to the data of n times measurement, obtains the normalization wavelength value of Millisecond in current slot；
(5) in data processing and communication terminal (1) pre-set algorithm, by the temperature-for currently normalizing wavelength value and calibration
Wavelength curve, the distribution of water temperature of inverting different location optical grating point；
Step 5: circulation measurement: repeating said steps four obtain the temperature value of different depth position in subsequent time water environment；
Step 6: the building of water environment temperature gradient: it will be uploaded to data processing behind the position of grating and Temperature Matching and communicate eventually
(1) is held to establish the temperature gradient distribution of water environment by algorithm process.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113288055A (en) * | 2021-05-20 | 2021-08-24 | 中国科学技术大学 | Distributed Raman fiber multi-target detection system |
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| CN115792664A (en) * | 2023-02-08 | 2023-03-14 | 山东省科学院激光研究所 | Battery parameter detection device |
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| CN112785815B (en) * | 2021-01-27 | 2024-05-28 | 哈尔滨工业大学 | Surge monitoring device and method based on distributed optical fiber sensing technology |
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| CN114674454A (en) * | 2022-03-11 | 2022-06-28 | 武汉理工大学 | Concrete temperature monitoring system and method based on fiber grating array sensing |
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| CN115792664A (en) * | 2023-02-08 | 2023-03-14 | 山东省科学院激光研究所 | Battery parameter detection device |
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