CN201297967Y - Loop detection type distributed optical fiber temperature sensor - Google Patents
Loop detection type distributed optical fiber temperature sensor Download PDFInfo
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- CN201297967Y CN201297967Y CNU2008201559516U CN200820155951U CN201297967Y CN 201297967 Y CN201297967 Y CN 201297967Y CN U2008201559516 U CNU2008201559516 U CN U2008201559516U CN 200820155951 U CN200820155951 U CN 200820155951U CN 201297967 Y CN201297967 Y CN 201297967Y
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Abstract
The utility model relates to a loop detection type distributed optical fiber temperature sensor which mainly comprises a laser, wherein, the input terminal of the laser is connected with the output terminal of a laser driver, the input terminal of the laser driver is connected with the output terminal of a synchronous controller, and the output terminal of the laser is connected with the input terminal of a coupler; the output terminal of the coupler is connected with the input terminal of an optical path switcher which enables an optical path to switch between two ports of a loop detection optical cable; a computer is connected with a data processor which controls the synchronous controller and receives data from a data collector; data detected by the loop detection optical cable is received and computed by the data processor; then the optical path switcher leads the optical path to switch to the other port, and the data collector collects processing signals; and finally, data obtained is displayed on the computer in the form of curves. The measuring accuracy of the system is improved, the measurement is carried out from the two ports, the bidirectional measurement is calibrated automatically, and the measurement at the beginning is consistent with the measurement at the end. The utility model has the advantage of improved measuring accuracy, and can still accurately detect each part of the optical fiber even when the optical fiber cable is fractured.
Description
Technical field
The utility model relates to the distributed fiber temperature sensing apparatus technology, a kind of specifically loop detecting type distributed optical fiber temperature sensing device.
Background technology
Optical fiber temperature sensing device is mainly used in industries such as traffic, building, electric power, colliery, petrochemical industry, and its effect is that the real time temperature monitoring is carried out in these important places.It ensures that to normally moving with guaranteeing industrial system equipment the safety of life and property plays an important role.
Existing optical fiber temperature sensing device is made up of laser driver, laser instrument, isochronous controller, coupling mechanism, reference optical fiber, light filter, photoelectric probe, signal amplifier, data acquisition unit and computing machine.Its principle of work is: laser instrument is continuously launched laser in detecting optical cable, back scattering can take place in the transmission course in laser in optical cable, because the loudspeaker diffuse spectrum is responsive to temperature, by coupling mechanism and light filter the loudspeaker diffuse spectrum in the rear orientation light is separated, pass through the laggard line data collection of opto-electronic conversion and signal processing and amplifying again, and then the data that collect are sent to the data processor computing machine handle calculating, finally draw temperature data.
In distributed optical fiber temperature sensing system, because the abominable and accident of monitoring site environment tends to cause the fracture of optical fiber; Because measuring distance is long, the reason of laser attenuation can cause detecting optical cable latter end degree of accuracy to descend simultaneously.The defective that existing method exists and not enough as follows:
1) only measure from an end of detecting optical cable, measuring accuracy is terminal poor detecting optical cable;
2) if detecting optical cable ruptures, post-rift part can't measure;
3) reason owing to laser attenuation can cause detecting optical cable to measure inconsistent situation from beginning to end;
So still need the inner structure of existing distributed fiber temperature sensing equipment is further improved.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of loop detecting distributed optical fiber temperature sensing device, and this device is measured from the two ends of loop detecting optical cable, has improved the measuring accuracy of system; Measure from two ends, bidirectional measurement is calibrated automatically, has not only guaranteed the consistance of measuring from beginning to end, has also improved measuring accuracy; After the detecting optical cable fracture, still can accurately measure the each several part of detection optical fiber.Overcome the shortcoming and defect that exists in the prior art.
For addressing the above problem, the utility model adopts following technical scheme: a kind of loop detecting distributed optical fiber temperature sensing device, it mainly comprises laser instrument, the input end of laser instrument is connected with the output terminal of laser driver, the input end of laser driver is connected with the output terminal of isochronous controller, the input end of isochronous controller is connected with the output terminal of data processor, the output terminal coupling mechanism input end of laser instrument connects, and the output terminal of coupling mechanism is connected with the input end of light path switch and light filter; Two output terminals of light path switch connect the two ends of a detection optical fiber respectively; The output terminal of light filter connects the input end of photoelectric commutator, and the output terminal of photoelectric commutator is connected with amplifier input terminal, and the output terminal of amplifier is connected with the input end of data acquisition unit, and the output terminal of data acquisition unit is connected with the input end of data processor; Data processor is connected with computing machine.
It is characterized in that: described light path switch, its input end connects the output terminal of coupling mechanism, and is subjected to the control of data acquisition unit, by instruction the light path of coupling mechanism output terminal is switched between No. 1 port of loop detecting optical cable and No. 2 ports; Wherein, No. 2 ports and No. 1 port 2 ports that are a detecting optical cable; Earlier light path is switched to port No. 1 receive the instruction of starting working when data acquisition unit after, gather the data that the whole piece detecting optical cable returns, give data processor with the data that collect then; The light path switch switches to port No. 2 with light path then, gathers the data that the whole piece detecting optical cable returns once more, gives data processor with the data that collect; Data processor carries out computing to data after receiving the data that record from loop detecting optical cable two ends; The light path switch switches to light path No. 1 port, acquisition process signal more then; So circulation finally draws temperature data and shows with the form of curve on computers.
As one of preferred version of the present utility model, described data acquisition unit is pressed some cycles and is driven the light path switch, and device is just in time handled the data that several times collect well in this cycle.
The utility model discloses a kind of loop detecting distributed optical fiber temperature sensing device, it compares the utility model with traditional optical fiber temperature measurement sensing equipment following advantage and good effect:
1, measures from the two ends of detecting optical cable, improved the measuring accuracy of system;
2, if detecting optical cable ruptures, still can measure after the fracture, not the situation that can cause post-rift part to measure from two ends;
3, measure from two ends, bidirectional measurement is calibrated automatically, has guaranteed the consistance of measuring from beginning to end;
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is a light path switch structural representation in the utility model.
Fig. 3 is the utility model principle of work process flow diagram;
Embodiment
Be described in further detail below in conjunction with the enforcement of specific embodiment technical scheme:
The utility model relates to a kind of loop detecting distributed optical fiber temperature sensing device, it mainly comprises laser instrument 3, laser instrument 3 is connected with the output terminal of laser driver 2, the input end of laser driver 2 is connected with the output terminal of isochronous controller 1, and the input end of isochronous controller 1 is connected with the output terminal of data processor 13; The input end of the output terminal coupling mechanism 4 of laser instrument 3 connects, and the output terminal of coupling device 4 is connected with the input end of light path switch 9 with light filter 5; The input end that the output terminal of light filter 5 connects photoelectric commutator 6 connects, the output terminal of photoelectric commutator 6 is connected with the input end of amplifier 7, the output terminal of amplifier 7 is connected with the input end of data acquisition unit 8, and the output terminal of data acquisition unit 8 is connected with an input end of data processor 16; The input end of described light path switch 9 connects coupling mechanism 4 and is subjected to the control of data acquisition unit 8, by instruction the light signal in the coupling mechanism 4 is sent into No. 1 port or No. 2 ports; Wherein, No. 2 ports and No. 1 port 2 ports that are a loop detecting optical cable; Data acquisition unit 8 switches to port No. 1 with light path earlier after receiving the instruction of starting working, and gathers the data that the whole piece detecting optical cable returns, and gives data processor with the data that collect then; Light path switch 9 switches to port No. 2 with light path then, gathers the data that the whole piece detecting optical cable returns once more, gives data processor with the data that collect; Data processor 13 carries out computing to data after receiving the data that record from loop detecting optical cable two ends, finally draws temperature data and shows with the form of curve on computers.
The utility model is measured from the two ends of detecting optical cable, has improved the measuring accuracy of system; When the detecting optical cable fracture, still can measure after the fracture from two ends, solved because of some situation that can't measure of detecting optical cable fracture back; Measure from two ends, bidirectional measurement is calibrated automatically, has not only guaranteed the consistance of measuring from beginning to end, has also improved measuring accuracy.
Wherein computing machine 14 is a peripherals, and other equipment are to be enclosed in the casing, and computing machine carries out communication by data communication interface and data processor and reads internal data, and shows on computers.
In the specific implementation, described isochronous controller 1 is to adopt the CDCE913 synchronous clock circuit module of Texas Instruments to realize;
In the specific implementation, described laser driver 2 is the current drivers that adopt high speed circuit to make, well drive laser emission laser;
In the specific implementation, described laser instrument 3 is semiconductor lasers, can launch laser according to the drive current of Laser Driven;
In the specific implementation, sensor fibre in the described detecting optical cable is to adopt 62.5/125 μ m multimode optical fiber to add the low smoke and zero halogen oversheath, bandwidth range is 〉=400MHZ@850nm, 〉=1000MHZ@1300nm, attenuation range is≤3.0dB@850nm ,≤0.8dB@1300nm, at skin;
In the specific implementation, described photoelectric commutator 6 adopts high sensitivity APD avalanche diode to come exploring laser light, with the light signal switching electrical signals;
In the specific implementation, described amplifier 7 is the big devices of the high performance computing of OPA365 type that adopt Texas Instruments;
In the specific implementation, described data acquisition unit 8 is the high speed data acquisition systems that adopt Texas Instruments, and travelling speed is 100Mb/s;
In the specific implementation, described data processor 13 be adopt ALTERA company tell what FPGA realized;
In the specific implementation, described computing machine 14 is general-purpose industrial level computing machines.
As shown in Figure 1 and Figure 2, when computing machine 14 sent the temperature monitoring order to data processor 13, data processor 13 drove isochronous controller 1 and sends synchronizing pulse control laser driver 2 and data acquisition unit 8 synchronous workings; Laser driver 2 just begins drive laser 3 work after receiving the synchronizing pulse that isochronous controller 1 sends, and continuously sends laser in optical fiber; The back can take place to the loudspeaker diffuse scattering in laser when transmitting in optical fiber, the light signal that back scattering is returned is coupled device 4 and separates and import light filter 5, photoelectric commutator 6 and amplifier 7 into, is injected into data acquisition unit 8 at last; The data 8 of data processor 13 control isochronous controllers 1 and reception data acquisition unit; Isochronous controller 1 sends synchronizing signal and is connected with data acquisition unit to laser driver, makes its synchronous working.
The utility model is that with the difference of utility model in the past the two ends of described sensor fibre all are connected on the light path switch 9, and light path switch 9 is subjected to the control of data acquisition unit 8; Light path switch 9 links to each other with coupling mechanism 4, by the control signal of the control line of data acquisition unit 8 laser signal is switched between No. 1 port of light path switch 9 and No. 1 port.Like this, data acquisition unit 8 switches to port No. 1 with light path earlier after receiving the instruction of starting working, and gathers the data that the whole piece detecting optical cable returns, and gives data processor with the data that collect then; Light path switch 9 switches to port No. 2 with light path then, gathers the data that the whole piece detecting optical cable returns once more, gives data processor with the data that collect; Data processor 13 carries out computing to data after receiving the data that record from loop detecting optical cable two ends, finally draws temperature data and shows with the form of curve on computers.
The utility model is measured from the two ends of detecting optical cable, has improved the measuring accuracy of system; When the detecting optical cable fracture, still can measure after the fracture from two ends, solved because of some situation that can't measure of detecting optical cable fracture back; Measure from two ends, bidirectional measurement is calibrated automatically, has not only guaranteed the consistance of measuring from beginning to end, has also improved measuring accuracy.
Above embodiment is the unrestricted the technical solution of the utility model in order to explanation only, and the technical scheme that does not break away from the utility model spirit and scope all should be encompassed in the middle of the patent claim of the present utility model.
Claims (2)
1, a kind of loop detecting distributed optical fiber temperature sensing device, it comprises laser instrument, the input end of laser instrument is connected with the output terminal of laser driver, the input end of laser driver is connected with the output terminal of isochronous controller, the input end of isochronous controller is connected with the output terminal of data processor, the output terminal coupling mechanism input end of laser instrument connects, and the output terminal of coupling mechanism is connected with the input end of light path switch and light filter; Two output terminals of light path switch connect the two ends of a detection optical fiber respectively; The output terminal of light filter connects the input end of photoelectric commutator, and the output terminal of photoelectric commutator is connected with amplifier input terminal, and the output terminal of amplifier is connected with the input end of data acquisition unit, and the output terminal of data acquisition unit is connected with the input end of data processor; Data processor is connected with computing machine,
It is characterized in that: described light path switch, its input end connects the output terminal of coupling mechanism, and is subjected to the control of data acquisition unit, by instruction the light path of coupling mechanism output terminal is switched between No. 1 port of loop detecting optical cable and No. 2 ports.
2. a kind of loop detecting distributed optical fiber temperature sensing device according to claim 1 is characterized in that: 2 ports that No. 1 port of described loop detecting optical cable and No. 2 ports are detecting optical cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201559516U CN201297967Y (en) | 2008-11-26 | 2008-11-26 | Loop detection type distributed optical fiber temperature sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201559516U CN201297967Y (en) | 2008-11-26 | 2008-11-26 | Loop detection type distributed optical fiber temperature sensor |
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| CN201297967Y true CN201297967Y (en) | 2009-08-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813532A (en) * | 2010-03-30 | 2010-08-25 | 中国计量学院 | Temperature field calibrating device and temperature field calibrating method of distributed optical fiber temperature sensor system |
| CN101825498A (en) * | 2010-04-13 | 2010-09-08 | 中国计量学院 | Distributed optical fiber Raman temperature sensor (DOFRTS) with self-correction of dispersion and loss spectra |
| CN101776492B (en) * | 2009-12-29 | 2011-11-16 | 聚光科技(杭州)股份有限公司 | Distributed fiber-sensing measuring method and device |
-
2008
- 2008-11-26 CN CNU2008201559516U patent/CN201297967Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101776492B (en) * | 2009-12-29 | 2011-11-16 | 聚光科技(杭州)股份有限公司 | Distributed fiber-sensing measuring method and device |
| CN101813532A (en) * | 2010-03-30 | 2010-08-25 | 中国计量学院 | Temperature field calibrating device and temperature field calibrating method of distributed optical fiber temperature sensor system |
| CN101813532B (en) * | 2010-03-30 | 2012-01-04 | 中国计量学院 | Temperature field calibrating device and temperature field calibrating method of distributed optical fiber temperature sensor system |
| CN101825498A (en) * | 2010-04-13 | 2010-09-08 | 中国计量学院 | Distributed optical fiber Raman temperature sensor (DOFRTS) with self-correction of dispersion and loss spectra |
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| C14 | Grant of patent or utility model | ||
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Addressee: SHANGHAI HUAWEI AT Co., Ltd. Document name: Notification to Pay the Fees |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090826 Termination date: 20151126 |