CN209605977U - A kind of temperature-measuring system of distributed fibers containing auto-adaptive filter circuit - Google Patents
A kind of temperature-measuring system of distributed fibers containing auto-adaptive filter circuit Download PDFInfo
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- CN209605977U CN209605977U CN201920067321.1U CN201920067321U CN209605977U CN 209605977 U CN209605977 U CN 209605977U CN 201920067321 U CN201920067321 U CN 201920067321U CN 209605977 U CN209605977 U CN 209605977U
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Abstract
A kind of temperature-measuring system of distributed fibers containing auto-adaptive filter circuit is used for thermometric.Be characterized in: narrow pulse laser is sequentially connected with light dispenser, reference optical fiber box, sensor fibre；Light dispenser is connect with optical splitter；Optical splitter is sequentially connected with A anti-Stokes optical filter, the first APD amplification module, high-speed AD acquisition module respectively；Optical splitter is sequentially connected with B anti-Stokes optical filter, the 2nd APD amplification module, high-speed AD acquisition module respectively；The synchronous triggering port of high-speed AD acquisition module is connect with narrow pulse laser；High-speed AD acquisition module, FPGA data processing module, FPGA auto-adaptive filter circuit, host computer are sequentially connected, wherein the bias tune interface of FPGA data processing module is connect with the 2nd APD amplification module another port, and the 2nd APD amplification module is connect with the first APD amplification module.Advantage: temperature measurement accuracy is high, and conversion speed is fast.
Description
Technical field
The utility model relates to distributed optical fiber temperature measurement technical field, especially a kind of point containing auto-adaptive filter circuit
Cloth optical fiber temperature measurement system.
Background technique
Temperature-measuring system of distributed fibers is widely used in the place for needing to carry out temperature long range on-line monitoring, such as day
Oil gas storage tank and feed-line in right gas petroleum industry, power plant, substation and power cable line in power industry,
The underground pipe gallery etc. of highway and railway tunnel and city in traffic transport industry.And distributed optical fiber temperature measurement
System is limited by hardware computing capability, and temperature measurement accuracy and response speed cannot be optimal simultaneously.When temperature measurement accuracy height
When, carry out signal processing is taken more time, response speed is relatively slow.In practical application, some application requirements response speeds
Fastly, of less demanding to temperature measurement accuracy, such as the fire monitoring of railway tunnel；Some occasion precedence requirement temperature measurement accuracies are high, secondly
Response speed is considered, such as the temperature monitoring of power cable.Therefore, thermometric essence is adjusted flexibly in the requirement for coping with different occasions
Degree and response time have actual use meaning.
First sketch the principle of distributed optical fiber temperature sensing system below: distributed optical fiber temperature sensing system is based on light
Raman scattering principle and OTDR technique, optical fiber (being typically fabricated as optical cable) be both temperature-sensing element and signal transmission unit
Part.Sensibility of the Raman diffused light to temperature of optical fiber is utilized in distributed optical fiber temperature sensing system, i.e. optical fiber is laid with space
The backward Raman scattering light transmitted in optical fiber has been modulated in the temperature field of position, after photoelectric conversion and signal processing, so that it may demodulate
The real time temperature information in temperature field out.The composition of distributed optical fiber temperature sensing system generally comprises narrow pulse laser, light tune
Clutch, optical splitter, optical filter, photodetector, signal amplification module, data acquisition module and system processor.Due to drawing
Graceful scattering light is very faint, therefore generallys use the APD (avalanche photodide) of amplification as photodetector.
APD output electric signal be still it is faint, be submerged in noise, signal-to-noise ratio is very poor.Noise in system includes that APD is generated
Dark current noise, the white noise etc. that element generates in the ASE noise and system that light source generates.For disappearing for white noise
It removes, traditional method is multi collect signal, average again after then these signals are added up.Theory analysis uses averaging method
Noise (noise is eliminated mutually) can be effectively reduced, but the method for cumulative mean takes a long time, and the ability for eliminating white noise has
The limit；Computer disposal speed also limits denoising level, and the influence of white noise is still obvious, and system signal noise ratio is undesirable.
Utility model content
The purpose of this utility model is: a kind of temperature-measuring system of distributed fibers containing auto-adaptive filter circuit is provided,
In the flexibility for improving temperature-measuring system of distributed fibers signal-to-noise ratio usage scenario different with reply.
In order to achieve the above object, the utility model uses a kind of distributed optical fiber temperature measurement containing auto-adaptive filter circuit
System, its main feature is that using the variable-step self-adaptive filter circuit of FPGA design to carry out noise reduction process.
The utility model is generally achieved by the following measures: the coefficient of sef-adapting filter is by adaptively calculating
The time-varying coefficient that method updates, i.e. its coefficient is automatically and continuously adapted to Setting signal, to obtain expected response.Adaptive-filtering
The most important feature of device is that it can effectively work in circumstances not known, and the time-varying that can track input signal is special
Sign.The step-length Adjustment principle of variable step size adaptive filtering algorithm is: when application condition is big, using biggish step-length, to accelerate
Convergence rate；When application condition is small, using lesser step-length, to obtain lesser mean square error.With various serial structure cores
Piece is compared, and the design structure of FPGA and the distributed algorithm of sef-adapting filter are adapted, and can be economized on resources, promotion processing
Efficiency realizes that it is used in the higher system of requirement of real-time.
A kind of temperature-measuring system of distributed fibers containing auto-adaptive filter circuit, it is characterized in that: narrow pulse laser 1 and light
Dispenser 2, reference optical fiber box 3, sensor fibre 4 are sequentially connected；Light dispenser 2 is connect by optical fiber with optical splitter 5, optical splitter 5
Two output ends are separately connected A anti-Stokes optical filter 6 and B anti-Stokes optical filter 7, and A reflected light is divided into this
The respective output end of lentor optical filter 6 and B anti-Stokes optical filter 7, respectively with the first APD amplification module 8 and
The input terminal of two APD amplification modules 9 is connected；The respective output end of first APD amplification module 8 and the 2nd APD amplification module 9 with
Two input terminals of high-speed AD acquisition module 10 are connected；High-speed AD acquisition module 10 synchronizes set out port and narrow pulse laser 1
Connection；High-speed AD acquisition module 10, FPGA data processing module 11, FPGA auto-adaptive filter circuit 12, host computer 13 are successively
Connection, wherein the bias tune interface of FPGA data processing module 11 is connect with 9 another port of the 2nd APD amplification module, and second
APD amplification module 9 is connect with the first APD amplification module 8.
It is characterized in that: being integrated with temperature self calibration module and temperature sensor in the reference optical fiber box 3, can measure
System calibrating is used for after scene temperature.
It is characterized in that: there are two bias tune interface, 8 Hes of the first APD amplification module for the tool of FPGA data processing module 11
2nd APD amplification module 9 respectively has a bias adjustment input port, and FPGA data processing module 11 can be to the first APD
Amplification module 8 and the 2nd APD amplification module 9 carry out bias section.
It is characterized in that: the FPGA auto-adaptive filter circuit 12, is equipped with adjustable precision requirement and algorithm steps based on FPGA
Long auto-adaptive filter circuit.
The utility model, which has the advantage that, reduces system noise, improves system signal noise ratio, improves system
Temperature measurement accuracy, conversion speed is fast, and applicable situation is extensive.
Detailed description of the invention
Fig. 1 is the utility model principle wire figure；Fig. 2 is utility model works flow chart element line chart.
Description of symbols in attached drawing: 1. narrow pulse lasers；2. smooth dispenser；3. reference optical fiber box；4. sensor fibre；5.
Optical splitter；6.A anti-Stokes optical filter；7.B anti-Stokes optical filter；8. the first APD amplification module；9. second
APD amplification module；10. high-speed AD acquisition module；11.FPGA data processing module；12.FPGA auto-adaptive filter circuit；13.
Host computer.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
The present invention uses a kind of distributed optical fiber temperature sensing system noise reduction side based on variable-step self-adaptive filter method
Method, system various pieces function are as follows: the narrow-pulse laser generator 1 is for issuing narrow-pulse laser, narrow-pulse laser hair
The power adjustable of raw device 1, the narrow-pulse laser frequency and pulse width of sending are also adjustable；Narrow-pulse laser is concocted by light
Device 2 and reference optical fiber box (approved product, the module of self calibration containing temperature) 3 enter sensor fibre 4, and forward along sensing optic cable
Transmission, while the Raman diffused light of reverse transfers is generated in cable interior；Raman diffused light is returned to back along optical cable transmission
Light dispenser 2, and enter optical splitter 5；
The narrow pulse laser 1 is driven by the synchronized signal that high-speed AD acquisition module 10 generates, so that high-speed AD
Acquisition module 10 is able to acquire useful signal at the time of correct；
It is integrated with temperature self calibration module in the reference optical fiber box 3, containing temperature sensor, live temperature can be measured
System calibrating is used for after degree；
The smooth dispenser 2, function is: narrow-pulse laser being allowed to pass through light dispenser from narrow pulse laser 1
2, it can only enter reference optical fiber box 3, but not can enter in optical splitter 5；Allow Raman diffused light from reference optical fiber box 3
By light dispenser 2, optical splitter 5 can only enter, but cannot enter narrow-pulse laser light source 1；
The sensor fibre 4, function are the temperature changes of detection optical fiber local environment.When optical cable local environment temperature
When changing, internal Raman scattered light intensity also changes, according to this variation, so that it may demodulate optical cable institute
Locate the temperature information of environment；
Raman diffused light is transmitted to A anti-Stokes optical filter 6 and B Stokes optical filter by the optical splitter 5
7；
The first APD amplification module 8 and the 2nd APD amplification module 9, function are that optical signal is transformed into electric signal
Afterwards, it amplifies, bias voltage is adjustable；
The high-speed AD acquisition module 10 has the function of high-speed AD acquisition and exports the function of synchronous triggering signal；
The FPGA data processing module 11, has the function of signal cumulative mean；The FPGA data processing module 11
There are two bias adjustment output port, the first APD amplification module 8 and the 2nd APD amplification modules 9 respectively to have a bias tune for tool
Input port is saved, FPGA data processing module 11 can carry out partially the first APD amplification module 8 and the 2nd APD amplification module 9
Pressure is adjusted；
The FPGA auto-adaptive filter circuit 12, based on oneself of the requirement of FPGA design adjustable precision and algorithm step-size
Adaptive filtering circuit；
The host computer 13, function are to complete the demodulation of temperature information, display and data base administration of temperature curve etc.
Function.
Utility model works process is summarised as following steps, or as shown in Figure 2:
The initial algorithm step-length of required precision and sef-adapting filter is arranged in step 1；
Step 2, activation system, the first APD amplification module 8 and the output synchronous triggering signal touching of the 2nd APD amplification module 9
Narrow pulse laser 1 is sent out, and acquires data, analog voltage signal is converted into digital signal；
The voltage value of collected two ways of optical signals is carried out cumulative mean by step 3, FPGA data processing module 11；
Step 4, FPGA auto-adaptive filter circuit 12 carry out adaptive-filtering to signal；
Step 5, checks whether precision meets condition, if it is not, repeating step 4 after then reducing algorithm step-size；If so, into
Enter step 6；
Treated data are sent into host computer 13 and carry out temperature demodulation operation by step 6, where obtaining sensing optic cable
The temperature information of each position carries out the display of temperature curve, and stores in the database.
The variable step size adaptive filtering algorithm that the utility model uses is when application condition is big, using biggish step-length, with
Accelerate convergence rate；When application condition is small, using lesser step-length, to obtain lesser mean square error.Based on FPGA design
Variable-step self-adaptive filter, adjustable required precision and algorithm step-size can save system resource, promote treatment effeciency,
Flexibility is good.
The advantages of what is be shown and described above is the basic principles and main features and the utility model of the utility model, this
The technical staff of industry should be recognized that the utility model is not limited by features described above, described in features described above and specification
Only say the principles of the present invention, under the premise of not departing from the utility model principle and range, the utility model is also had
Various changes and modifications, these changes and improvements are both fallen within by the utility model the attached claims and its equivalent thereof
Protection scope in.
Claims (4)
1. a kind of temperature-measuring system of distributed fibers containing auto-adaptive filter circuit, it is characterized in that: narrow pulse laser (1) and light tune
Clutch (2), reference optical fiber box (3), sensor fibre (4) are sequentially connected；Light dispenser (2) another port is by optical fiber and optical splitter
(5) it connects, two output ends of optical splitter (5) are separately connected A anti-Stokes optical filter (6) and the filter of B anti-Stokes light
Wave device (7), by the respective output end of A anti-Stokes optical filter (6) and B anti-Stokes optical filter (7), respectively with
One APD amplification module (8) is connected with the input terminal of the 2nd APD amplification module (9)；First APD amplification module (8) and the 2nd APD
The respective output end of amplification module (9) is connected with two input terminals of high-speed AD acquisition module (10)；High-speed AD acquisition module (10)
Synchronous triggering port connect with narrow pulse laser (1)；High-speed AD acquisition module (10), FPGA data processing module (11),
FPGA auto-adaptive filter circuit (12), host computer (13) are sequentially connected, and wherein the bias tune of FPGA data processing module (11) connects
Mouth is connect with the 2nd APD amplification module (9) another port, and the 2nd APD amplification module (9) and the first APD amplification module (8) are even
It connects.
2. a kind of temperature-measuring system of distributed fibers containing auto-adaptive filter circuit as described in claim 1, it is characterized in that: the ginseng
It examines in fiber termination box (3) and is integrated with temperature self calibration module and temperature sensor, be used for system calibrating after scene temperature can be measured.
3. a kind of temperature-measuring system of distributed fibers containing auto-adaptive filter circuit as described in claim 1, it is characterized in that: described
There are two bias adjustment output port, the first APD amplification module (8) and the 2nd APD amplifications for FPGA data processing module (11) tool
Module (9) respectively has a bias adjustment input port, and FPGA data processing module (11) can be to the first APD amplification module
(8) and the 2nd APD amplification module (9) carries out bias adjustment.
4. a kind of temperature-measuring system of distributed fibers containing auto-adaptive filter circuit as described in claim 1, it is characterized in that: described
FPGA auto-adaptive filter circuit (12) is equipped with the auto-adaptive filter circuit of adjustable precision requirement and algorithm step-size based on FPGA.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289142A (en) * | 2020-03-18 | 2020-06-16 | 太原理工大学 | Signal adaptive interference cancellation method for distributed optical fiber Raman temperature measurement system |
| CN113899465A (en) * | 2021-11-11 | 2022-01-07 | 天津津航技术物理研究所 | Optical fiber temperature-sensing fire detection device for fire fighting |
| CN114046900A (en) * | 2021-11-11 | 2022-02-15 | 许继电气股份有限公司 | Self-adaptive filtering method and device for distributed optical fiber temperature measurement system |
-
2019
- 2019-01-02 CN CN201920067321.1U patent/CN209605977U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289142A (en) * | 2020-03-18 | 2020-06-16 | 太原理工大学 | Signal adaptive interference cancellation method for distributed optical fiber Raman temperature measurement system |
| CN111289142B (en) * | 2020-03-18 | 2021-02-05 | 太原理工大学 | Signal adaptive interference cancellation method for distributed optical fiber Raman temperature measurement system |
| CN113899465A (en) * | 2021-11-11 | 2022-01-07 | 天津津航技术物理研究所 | Optical fiber temperature-sensing fire detection device for fire fighting |
| CN114046900A (en) * | 2021-11-11 | 2022-02-15 | 许继电气股份有限公司 | Self-adaptive filtering method and device for distributed optical fiber temperature measurement system |
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