CN110361107A - A kind of distributed temperature detection system and method based on iir digital filter - Google Patents
A kind of distributed temperature detection system and method based on iir digital filter Download PDFInfo
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- CN110361107A CN110361107A CN201910471168.3A CN201910471168A CN110361107A CN 110361107 A CN110361107 A CN 110361107A CN 201910471168 A CN201910471168 A CN 201910471168A CN 110361107 A CN110361107 A CN 110361107A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01K11/324—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 using Raman scattering
Abstract
The invention discloses a kind of distributed temperature detection system and method based on iir digital filter, the detection system include sequentially connected signal receiving unit, photoelectric conversion unit, signal amplification unit, A/D converting unit, data processing unit, temperature resolution unit, iir digital filter and data outputting unit.The present invention increases the digital filtering to signal after the random noise reduction of cumulative mean, it further reduced noise, under identical time of measuring, better temperature resolution index can be obtained, it is computed, temperature resolution can averagely promote 3dB, and iir digital filter is not influenced by ambient temperature, and performance reliability is high.
Description
Technical field
The invention belongs to optical fiber temperature sensor technology fields, and in particular to a kind of distribution based on iir digital filter
System for detecting temperature and method.
Background technique
Distributed temperature sensing system (DTS), be by send beam of laser to optical fiber in, system acquisition optical fiber generate
Backscattering optical signal parses the temperature value of all location points of optical fiber, since back-scattering light is very faint, signal-to-noise ratio very little,
Influence the index of temperature resolution.Temperature resolution is an important indicator of DTS, and characterization system can measure minimum temperature change
The ability of change, it is in the prior art, general to be averaged again using multiple signal acquisition to improve signal-to-noise ratio, random noise is reduced, but same
When also extend time of measuring.
DTS usually has the data of up to tens of thousands of a location points, and the signal of each location point is irrelevant, since optical time domain is anti-
The characteristic penetrated, distance is longer, and noise is bigger.Noise reduction process needs handle the historical data of each location point, calculation amount
It is very big, it takes a long time.
In the case of time of measuring is more sensitive (such as fire-fighting domain), thermometric in a relatively short period of time, noise is big, although
Better noise reduction algorithm can be used, but DTS needs high-speed data acquisition, real time signal processing occupancy cpu resource is more, time-consuming
Long, can not be averaged noise reduction technology instead of conventional data.Therefore, the considerations of being limited to requirement of real-time or cost, it is common at present
Signal processor (DSP or FPGA) be difficult to that the noise reduction process of every frame data real-time perfoming complexity is limited and further mentioned
Rise the temperature resolution performance of DTS.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides a kind of distributed temperature based on iir digital filter
Detection system, the present invention can effectively improve temperature resolution index under identical time of measuring.
To achieve the above object, the invention adopts the following technical scheme:
The first aspect of the present invention, provides a kind of distributed temperature detection system based on iir digital filter, including according to
Signal receiving unit, photoelectric conversion unit, signal amplification unit, A/D converting unit, the data processing unit, temperature of secondary connection
Resolution unit, iir digital filter and data outputting unit,
The signal receiving unit is for receiving temperature signal, and the photoelectric conversion unit is by the received dim light of receiving unit
Signal is converted into high frequency weak electric signal, and the signal amplification unit amplifies high frequency weak electric signal, the A/D converting unit
For converting digital signal by electric signal for temperature signal, the data processing unit in real time carries out temperature initial data tired
Add averagely to reduce random noise, the temperature resolution unit will be for that will pass through algorithm solution containing the initial data of temperature information
Corresponding temperature value is precipitated, the iir digital filter is used to carry out the temperature value of output noise reduction, the data output
Unit is for exporting the temperature value after noise reduction.
The data processing unit is dsp processor or FPGA processor as a preferred technical solution,.
The iir digital filter connects external RAM as a preferred technical solution,.
The second aspect of the present invention, provides a kind of distributed temperature detection method based on iir digital filter, including with
Lower step:
Step 1: temperature signal receives；Pass through the temperature signal of point each in signal receiving unit reception optical fiber；
Step 2: photoelectric conversion；The temperature signal that step 1 receives is converted into high frequency weak electric signal by low light signals；
Step 3: signal amplifies；Weak electric signal in step 2 is amplified by signal amplification unit；
Step 4: signal is converted；Digital signal is converted by electric signal by amplified temperature signal；
Step 5: cumulative mean；Carrying out cumulative mean to the digital signal that step 4 obtains reduces random noise；
Step 6: temperature parses；Temperature signal parsing after cumulative mean in step 5 is converted into corresponding temperature number
Value；
Step 7: filtering noise reduction；Iir digital filter carries out low-pass filtering to the temperature value in step 6, reduces defeated
The noise of temperature value out；
Step 8: data export；Data outputting unit exports the temperature value after noise reduction.
The intermediate data of the step 7 iir digital filter operation deposits in external RAM as a preferred technical solution,
In, refresh historical data after recursive operation.
As a preferred technical solution, before system each run, iir digital filter is stored in the number in external RAM
According to clearing.
Compared with prior art, the invention has the benefit that
(1) present invention increases the digital filtering to signal after the random noise reduction of cumulative mean, further reduced noise,
Under identical time of measuring, better temperature resolution index can be obtained.
(2) present invention can effectively improve temperature resolution index, be computed, and temperature resolution can averagely promote 3dB.
(3) iir digital filter is not influenced by ambient temperature in the present invention, and performance reliability is high.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram based on iir digital filter distributed temperature detection system of the present invention.
Fig. 2 is the structural schematic diagram of iir digital filter in Fig. 1.
Wherein, appended drawing reference is described as follows: signal receiving unit 1, photoelectric conversion unit 2, signal amplification unit 3,
A/D converting unit 4, data processing unit 5, temperature resolution unit 6, iir digital filter 7 and data outputting unit 8, outside
RAM 9。
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under that premise of not paying creative labor
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the present embodiment provides a kind of distributed temperature detection system based on iir digital filter, successively
The signal receiving unit 1 of connection, photoelectric conversion unit 2, signal amplification unit 3, A/D converting unit 4, data processing unit 5, temperature
Spend resolution unit 6, iir digital filter 7 and data outputting unit 8.Iir digital filter 7 connects external RAM 9.
The signal receiving unit 1 is for receiving temperature signal, containing input optical fibre, Raman signal separation optically filtering
Device.The received low light signals of receiving unit 1 are converted high frequency weak electric signal, the signal amplification by the photoelectric conversion unit 2
Unit 3 amplifies high frequency weak electric signal, and the A/D converting unit 4 is used to convert number by electric signal for temperature signal
Signal, the data processing unit 5 carry out cumulative mean to temperature initial data in real time to reduce random noise, the temperature solution
Analysis unit 6 will be for that will go out corresponding temperature value by arithmetic analysis containing the initial data of temperature information.IIR digital filtering
Device 7 is used to be filtered the temperature value of output noise reduction, and the parameter of low-pass digital filter is determined according to actual use situation, with
Ensure that iir digital filter 7 is stable, filter factor takes into account noise reduction performance and temperature rise response time, using fixed point digit
The iir digital filter 7 of operation and two-level concatenation efficiently rapid computations and can reduce error.Data outputting unit 8 is for defeated
Temperature value after noise reduction out.Detection method includes the following steps for it:
Step 1: temperature signal receives；Pass through the temperature signal of each point in 1 reception optical fiber of signal receiving unit.
Step 2: photoelectric conversion；The temperature signal that photoelectric conversion unit 2 receives step 1 is converted to by low light signals
High frequency weak electric signal.
Step 3: signal amplifies；Weak electric signal in step 2 is amplified by signal amplification unit 3.
Step 4: signal is converted；Digital signal is converted by electric signal by amplified temperature signal.
Step 5: cumulative mean；Carrying out cumulative mean to the digital signal that step 4 obtains reduces random noise.
Step 6: temperature parses；Temperature signal parsing after cumulative mean in step 5 is converted into corresponding temperature number
Value.
Step 7: filtering noise reduction；Iir digital filter 7 carries out low-pass filtering to the temperature value in step 6, reduces defeated
The noise of temperature value out.The intermediate data of 7 operation of iir digital filter is deposited in external RAM 9, is refreshed after recursive operation
Historical data.Before system each run, iir digital filter 7 is stored in the zeros data in external RAM 9, avoids the occurrence of different
7 intermediate variable of iir digital filter is caused to be saturated after regular data.As shown in Fig. 2, history of the iir digital filter 7 for each column
Data carry out operation, and overall length optical fiber amounts to L point, and the low-pass cut-off frequencies of iir digital filter 7 should meet in practical application most
The demand of big temperature rise variation, while effectively filtering out high-frequency noise.
Step 8: data export；Data outputting unit 8 exports the temperature value after noise reduction.
For the present invention under conditions of not changing device hardware performance, by using iir digital filter 7, increased costs are very
It is few, temperature resolution is greatly improved, there is very strong practicability.
Although above-described embodiment makes specific descriptions to the present invention, come for those of ordinary skill in the art
It says, it is understood that can be modified within spirit and scope of the invention based on present disclosure not departing from
Or improve, these modification and improvement are all within spirit and scope of the invention.
Claims (6)
1. a kind of distributed temperature detection system based on iir digital filter, which is characterized in that including sequentially connected signal
Receiving unit (1), photoelectric conversion unit (2), signal amplification unit (3), A/D converting unit (4), data processing unit (5), temperature
Resolution unit (6), iir digital filter (7) and data outputting unit (8) are spent,
The signal receiving unit (1) receives receiving unit (1) for receiving temperature signal, the photoelectric conversion unit (2)
Low light signals be converted into high frequency weak electric signal, the signal amplification unit (3) amplifies high frequency weak electric signal, the A/
D conversion unit (4) is used to convert digital signal by electric signal for temperature signal, and the data processing unit (5) is in real time to temperature
Degree initial data carries out cumulative mean to reduce random noise, and the temperature resolution unit (6) will be for that will contain temperature information
Initial data goes out corresponding temperature value by arithmetic analysis, and the iir digital filter (7) is used for the temperature number to output
Value carries out noise reduction, and the data outputting unit (8) is for exporting the temperature value after noise reduction.
2. a kind of distributed temperature detection system based on iir digital filter as described in claim 1, which is characterized in that
The data processing unit (5) is dsp processor or FPGA processor.
3. a kind of distributed temperature detection system based on iir digital filter as described in claim 1, which is characterized in that
The iir digital filter (7) connects external RAM (9).
4. a kind of distributed temperature detection method based on iir digital filter, which comprises the following steps:
Step 1: temperature signal receives；Pass through the temperature signal of each point in signal receiving unit (1) reception optical fiber；
Step 2: photoelectric conversion；The temperature signal that step 1 receives is converted into high frequency weak electric signal by low light signals；
Step 3: signal amplifies；Weak electric signal in step 2 is amplified by signal amplification unit (3)；
Step 4: signal is converted；Digital signal is converted by electric signal by amplified temperature signal；
Step 5: cumulative mean；Carrying out cumulative mean to the digital signal that step 4 obtains reduces random noise；
Step 6: temperature parses；Temperature signal parsing after cumulative mean in step 5 is converted into corresponding temperature value；
Step 7: filtering noise reduction；Iir digital filter (7) carries out low-pass filtering to the temperature value in step 6, reduces output
The noise of temperature value；
Step 8: data export；Data outputting unit (8) exports the temperature value after noise reduction.
5. a kind of distributed temperature detection method based on iir digital filter as claimed in claim 4, which is characterized in that
The intermediate data of iir digital filter (7) operation is deposited in external RAM (9) in the step 7, is refreshed after recursive operation and is gone through
History data.
6. a kind of distributed temperature detection method based on iir digital filter as claimed in claim 5, which is characterized in that
Before system each run, iir digital filter (7) is stored in the zeros data in external RAM (9).
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