CN203719792U - Distributed optical fiber temperature measurement system - Google Patents
Distributed optical fiber temperature measurement system Download PDFInfo
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- CN203719792U CN203719792U CN201420003437.6U CN201420003437U CN203719792U CN 203719792 U CN203719792 U CN 203719792U CN 201420003437 U CN201420003437 U CN 201420003437U CN 203719792 U CN203719792 U CN 203719792U
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- temperature measuring
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- 239000013307 optical fiber Substances 0.000 title abstract description 10
- 238000009529 body temperature measurement Methods 0.000 title abstract description 4
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims description 34
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 abstract 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 2
- 238000001069 Raman spectroscopy Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model provides a distributed optical fiber temperature measurement system (DTS), comprising an amplification circuit, a collection circuit and an ARM (Advanced RISC Machines) microprocessor. The ARM microprocessor is in connection with the collection circuit and is arranged on an embedded mainboard; the amplification circuit and the collection circuit are both integrated on a sampling mainboard. The utility model provides a DTS with a display screen and based on an embedded system, thereby reducing power consumption and equipment dimension and realizing the functions of displaying monitoring information on site and setting parameters. In addition, the DTS employs a self-developed high speed acquisition card exclusively used for collecting DTS signals and has the characteristics of low cost and reliable performance.
Description
Technical field
The utility model relates to a kind of distributed fiber temperature measuring device, particularly a kind of distributed fiber temperature measuring device based on embedded system.
Background technology
Since 20th century, the mid-80 Britain developed fully distributed fiber Raman temperature sensor, fully distributed fiber Raman temperature sensor technology reaches its maturity, have various types of distributed optical fiber sensing device products both at home and abroad, and start embed and be provided in the various facilities such as electrical network, railway, bridge, tunnel, highway, building, water system, dam, colliery, oil and gas pipes.
Below sketch distributed optical fiber temperature measurement principle: the laser pulse that pulsed laser light source sends produces Raman scattering after entering optical fiber to be measured, its dorsad Raman scattering photon be back to optical splitter, through optical splitter, isolate stokes light and anti-Stokes light, by amplifying circuit, amplify respectively this two weak signals again, after sample circuit sampling, be aggregated into processor and demodulate temperature information.Wherein anti-Stokes light is more responsive to temperature, and as temperature sensing information, and stokes light can be used as reference information.Conventionally, the benchmark of temperature is to adopt the reference optical fiber that a built-in segment length is hundreds of meters to obtain, at reference optical fiber place, increase ordinary temp sensor and obtain in real time current actual temperature value, thereby then contrast conting theoretical value eliminate the factor that affects temperature stability due to the difference causing in light source power fluctuation, the discrete difference of amplifying circuit and spectroscopic processes etc.For different optical cables, when practical application, also need extrinsic calibration, the external cable of choosing certain length is placed in respectively under different temperatures to be revised, and obtains correction factor, thereby eliminates the temperature computation error of bringing due to the difference of optical cable.
At present, domestic and international existing distributed fiber temperature measuring device (DTS) has two kinds of patterns: one, and band industrial control computer mainboard in device, external-connection displayer, becomes independently temperature-sensitive system; Its two, in device, only have embedded system, after data simple process, be uploaded to main control server and carry out subsequent treatment.These two kinds of patterns have its weak point, and the former equipment volume is larger, unfavorable integrated, and power consumption is also larger; The latter is without showing output, and parameter need arrange by remote transmission, local operation inconvenience.For to reach desirable spatial resolution, generally adopt outsourcing high-speed collection card in addition, cost is very high.
Utility model content
The technical problems to be solved in the utility model be for overcome distributed fiber temperature measuring device volume in prior art large, be unfavorable for also larger defect of integrated and power consumption, a kind of distributed fiber temperature measuring device that had not only reduced power consumption but also reduced plant bulk is provided.
The utility model solves above-mentioned technical matters by following technical proposals:
The utility model provides a kind of distributed fiber temperature measuring device, it comprises an amplifying circuit and an Acquisition Circuit, its feature is, this distributed fiber temperature measuring device also comprises an ARM(Advanced RISC Machines, both can think the name of Yi Ge company, also can think the general designation to a class microprocessor) microprocessor, this ARM microprocessor is connected with this Acquisition Circuit, and this ARM microprocessor is located on an embedded main board, this amplifying circuit and this Acquisition Circuit are all integrated on a sampling mainboard.
Preferably, this distributed fiber temperature measuring device also comprises a wavelength division multiplexer, and this amplifying circuit comprises that the photoelectric receiving tube, one first amplifier, one first mirror current source, one second amplifier, one second mirror current source, one the 3rd amplifier and that is converted to electric signal for the light signal that the transmission of this wavelength division multiplexer is come being connected is successively for converting electrical signals to the differential amplifier of differential signal.
In this programme, this electric signal flow through successively this first amplifier, this first mirror current source, this second amplifier, this second mirror current source and the 3rd amplifier, and by this differential amplifier, this electric signal after amplifying is converted to differential signal.
Preferably, this photoelectric receiving tube is an APD(avalanche photodide).
Preferably, this Acquisition Circuit comprise one for the ADC chip (modulus conversion chip) and that this differential signal is converted to digital signal for gathering the FPGA(Field-Programmable Gate Array of this digital signal, field programmable gate array).
Preferably, this distributed fiber temperature measuring device also comprises a DAC chip (analog-digital chip) being connected with this FPGA, one first operational amplifier being connected with this DAC chip respectively and one second operational amplifier, this first operational amplifier is connected with the negative input end of this first amplifier, and this second operational amplifier is connected with the negative input end of this second amplifier;
This FPGA is used for controlling this DAC chip output level respectively to this first operational amplifier and this second operational amplifier, this first operational amplifier is for exporting the level signal after amplifying to the negative input end of this first amplifier, and this second operational amplifier is for exporting the level signal after amplifying to the negative input end of this second amplifier.
This programme utilizes this FPGA to control a level of this DAC chip output, then gives operational amplifier, the signal after amplifying is exported to the negative input end of signal amplifier, to reach the effect of regulation and control common mode electrical level.
Preferably, this distributed fiber temperature measuring device also comprises a display.This display, with 7 cun of LCDs, can show in real time the data of operation, and can input operational factor in user interface.
Meeting on the basis of this area general knowledge, above-mentioned each optimum condition, can combination in any, obtains each preferred embodiments of the utility model.
Positive progressive effect of the present utility model is:
The utility model provides a kind of and to realize, has both reduced power consumption, reduces equipment size based on embedded system and with the distributed fiber temperature measuring device of display screen, again can on-the-spot display monitoring information and the function of parameters.This device adopts the high-speed collection card of independent research in addition, is exclusively used in and gathers DTS signal, with low cost, dependable performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of the distributed fiber temperature measuring device of the utility model preferred embodiment.
Fig. 2 is the structural representation of the parts on the FPGA sampling mainboard in the distributed fiber temperature measuring device of the utility model preferred embodiment.
Embodiment
Mode below by embodiment further illustrates the utility model, but therefore the utility model is not limited among described scope of embodiments.
As illustrated in fig. 1 and 2, a kind of distributed fiber temperature measuring device is provided in the utility model embodiment, and it comprises a pulsed laser light source 1, a wavelength division multiplexer 2, an internal reference fiber termination box 3, a photoswitch 4, a sensor fibre 5, an amplifying circuit 6, an Acquisition Circuit 7 and an ARM microprocessor 8.The output terminal of this pulsed laser light source 1 is connected with the input end of this wavelength division multiplexer 2, the output terminal of this wavelength division multiplexer 2 is connected with the input end of this internal reference fiber termination box 3 with two input ends of this amplifying circuit 6 respectively, this internal reference fiber termination box 3 is connected with the input end of this photoswitch 4, the output terminal of this photoswitch 4 is connected with this sensor fibre 5, the output terminal of this amplifying circuit 6 is connected with two input ends of this Acquisition Circuit 7 respectively, this Acquisition Circuit 7 is connected with this pulsed laser light source 1 with this ARM microprocessor 8 respectively, wherein this amplifying circuit 6 is all integrated on FPGA sampling mainboard with this Acquisition Circuit 7, this ARM microprocessor 8 is located on an embedded main board.
Wherein, this pulsed laser light source 1 is high-peak power narrow-pulse laser light source, and the duration of pulse is less than 5ns, peak power 30w, line width 1.5nm.This wavelength division multiplexer 2 is Raman 1x3 wavelength division multiplexer, for separating of stokes light and anti-Stokes light.In this internal reference fiber termination box 3, be provided with the internal reference optical fiber of 200m, internal reference optical fiber is for real time calibration temperature deviation.
Shown in figure 2, this amplifying circuit 6 comprises the photoelectric receiving tube 61 being connected successively, one first amplifier 62, one first mirror current source 63, one second amplifier 64, one second mirror current source 65, one the 3rd amplifier 66 and a differential amplifier 67, this photoelectric receiving tube 61 is converted to electric signal for the light signal that these wavelength division multiplexer 2 transmission are come, this electric signal this first amplifier 62 of flowing through successively, this first mirror current source 63, this second amplifier 64, this the second mirror current source 65 and the 3rd amplifier 66, and convert electrical signals to differential signal by this differential amplifier 67.In order to improve the sensitivity of measurement, this photoelectric receiving tube 61 has adopted APD, and in circuit, adds frequency response circuit, to eliminate the frequency resonance of circuit; In order to improve signal to noise ratio (S/N ratio), in circuit, adopted the conversion of voltage signal to current signal, then the conversion (be image current source circuit, be specially this first mirror current source 63 and this second mirror current source 65) to voltage signal by current signal again.
This Acquisition Circuit 7 comprise one for the ADC chip 71 and that this differential signal is converted to digital signal for gathering the FPGA72 of this digital signal.This FPGA72 adopts 400M dominant frequency, and the inversion frequency of this ADC chip 71 has reached 150M, makes sampling precision higher, and resolution is better.
On this FPGA sampling mainboard, also comprise automatic control circuit, this is automatically controlled and comprises control that external trigger laser instrument is luminous and the auto-control of common mode electrical level.Laser instrument is sent out the interval time of pulsed light and the distance dependent of measurement, so automatic control circuit need to be determined the trigger interval time to laser instrument according to measuring distance.The auto-control of common mode electrical level, because the variation along with the variation of temperature and the different gains of amplifying circuit, its common mode electrical level also can change accordingly, and the variation of common mode electrical level also can change the differential signal of difference amplifier output, thereby affect the measurement range of this ADC chip 71, and the auto-control of common mode electrical level just just in time can solve this problem, method is: this FPGA72 connects a DAC chip 73, this DAC chip 73 is connected with one second operational amplifier 75 with one first operational amplifier 74 respectively, this first operational amplifier 74 is connected with the negative input end of this first amplifier 62, this second operational amplifier 75 is connected with the negative input end of this second amplifier 64.This FPGA72 is used for controlling these DAC chip 73 output levels respectively to this first operational amplifier 74 and this second operational amplifier 75, this first operational amplifier 74 is for exporting the level signal after amplifying to the negative input end of this first amplifier 62, this second operational amplifier 75 is for the level signal after amplifying being exported to the negative input end of this second amplifier 64, to reach the effect of regulation and control common mode electrical level.
This ARM microprocessor 8 is communicated by letter with this FPGA72, reads the data that this FPGA72 samples, and after this ARM microprocessor 8 carries out corresponding computing by the data that read and by result (as temperature value, alert data etc.), by a display, is presented on 7 cun of liquid crystal displays.This ARM microprocessor 8 also can be by serial ports or RJ45 network interface (RJ45 interface is generally used for data transmission, the modal network interface card interface that is applied as) and remote computer transmission data and instruction, to form sensing network.
The utility model is for the existing problem of existing domestic and international distributed fiber temperature measuring device, in conjunction with the service condition in reality, provide a kind of low-power consumption, volume little, with LCDs, operation is more convenient, cost is lower new distribution type optical fiber temperature-measurement device.
Although more than described embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection domain of the present utility model is limited by appended claims.Those skilled in the art is not deviating under the prerequisite of principle of the present utility model and essence, can make various changes or modifications to these embodiments, but these changes and modification all fall into protection domain of the present utility model.
Claims (6)
1. a distributed fiber temperature measuring device, it comprises an amplifying circuit and an Acquisition Circuit, it is characterized in that, this distributed fiber temperature measuring device also comprises an ARM microprocessor, this ARM microprocessor is connected with this Acquisition Circuit, and this ARM microprocessor is located on an embedded main board, this amplifying circuit and this Acquisition Circuit are all integrated on a sampling mainboard.
2. distributed fiber temperature measuring device as claimed in claim 1, it is characterized in that, this distributed fiber temperature measuring device also comprises a wavelength division multiplexer, and this amplifying circuit comprises that the photoelectric receiving tube, one first amplifier, one first mirror current source, one second amplifier, one second mirror current source, one the 3rd amplifier and that is converted to electric signal for the light signal that the transmission of this wavelength division multiplexer is come being connected is successively for converting electrical signals to the differential amplifier of differential signal.
3. distributed fiber temperature measuring device as claimed in claim 2, is characterized in that, this photoelectric receiving tube is an APD.
4. distributed fiber temperature measuring device as claimed in claim 2, is characterized in that, this Acquisition Circuit comprise one for the ADC chip and that this differential signal is converted to digital signal for gathering the FPGA of this digital signal.
5. distributed fiber temperature measuring device as claimed in claim 4, it is characterized in that, this distributed fiber temperature measuring device also comprises a DAC chip being connected with this FPGA, one first operational amplifier being connected with this DAC chip respectively and one second operational amplifier, this first operational amplifier is connected with the negative input end of this first amplifier, and this second operational amplifier is connected with the negative input end of this second amplifier;
This FPGA is used for controlling this DAC chip output level respectively to this first operational amplifier and this second operational amplifier, this first operational amplifier is for exporting the level signal after amplifying to the negative input end of this first amplifier, and this second operational amplifier is for exporting the level signal after amplifying to the negative input end of this second amplifier.
6. distributed fiber temperature measuring device as claimed in claim 1, is characterized in that, this distributed fiber temperature measuring device also comprises a display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420003437.6U CN203719792U (en) | 2014-01-03 | 2014-01-03 | Distributed optical fiber temperature measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420003437.6U CN203719792U (en) | 2014-01-03 | 2014-01-03 | Distributed optical fiber temperature measurement system |
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| CN203719792U true CN203719792U (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420003437.6U Expired - Lifetime CN203719792U (en) | 2014-01-03 | 2014-01-03 | Distributed optical fiber temperature measurement system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067146A (en) * | 2015-03-20 | 2015-11-18 | 深圳市迅捷光通科技有限公司 | Stimulated raman scattering suppression device, method and distributed optical fiber sensing system |
| CN110301096A (en) * | 2017-02-10 | 2019-10-01 | 华为技术有限公司 | The adjustment compensation of asymmetrical beam noise threshold |
-
2014
- 2014-01-03 CN CN201420003437.6U patent/CN203719792U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067146A (en) * | 2015-03-20 | 2015-11-18 | 深圳市迅捷光通科技有限公司 | Stimulated raman scattering suppression device, method and distributed optical fiber sensing system |
| CN110301096A (en) * | 2017-02-10 | 2019-10-01 | 华为技术有限公司 | The adjustment compensation of asymmetrical beam noise threshold |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180626 Address after: 200233 Shanghai Xuhui District Caohejing Development Zone No. 99, 13 Xin'an building, 6 floor. Co-patentee after: SHANGHAI GUANDWAY ELECTRIC POWER TECHNOLOGY CO.,LTD. Patentee after: SHANGHAI GRANDWAY TELECOM TECH Co.,Ltd. Address before: 201805 room 63, 919 lane, Zhao Jiang Road, Baihe Town, Qingpu District, Shanghai, E-112 Patentee before: SHANGHAI GRANDWAY TELECOM TECH Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140716 |