CN201297965Y - Distributed optical fiber sensing device simultaneously monitored by multiple channels - Google Patents

Distributed optical fiber sensing device simultaneously monitored by multiple channels Download PDF

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Publication number
CN201297965Y
CN201297965Y CNU2008201525810U CN200820152581U CN201297965Y CN 201297965 Y CN201297965 Y CN 201297965Y CN U2008201525810 U CNU2008201525810 U CN U2008201525810U CN 200820152581 U CN200820152581 U CN 200820152581U CN 201297965 Y CN201297965 Y CN 201297965Y
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China
Prior art keywords
input end
optical fiber
output terminal
output end
laser
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CNU2008201525810U
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Chinese (zh)
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周正仙
仝芳轩
刘亮
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SHANGHAI HUAWEI AT CO Ltd
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SHANGHAI HUAWEI AT CO Ltd
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Abstract

The utility model discloses a distributed optical fiber sensing device simultaneously monitored by multiple channels, which is characterized in that the output end of a splitter is connected with the input end of a coupler; the output end of the coupler is connected with the input end of a light filter; the output end of the light filter is connected with the input end of a detector; the output end of the detector is connected with the input end of an amplifier; the output end of the amplifier is connected with the input end of a multichannel data acquirer; an optical fiber interface is arranged at the coupler; the input end of a synchronous controller is connected with the output end of a data processor; and the output end of the multichannel data acquirer is connected with the input end of the data processor. The utility model has the advantages that firstly, the number of detecting optical fibers which can be simultaneously detected is be maximally increased by adopting the laser splitter; secondly, the detecting time interval can not be increased while the detecting optical fibers are increased; thirdly, the detection of large area, high density and multi-angle can be easily achieved; fourthly, the device has good performance-price ratio, long service life, and low maintenance cost; and fifthly, the multichannel optical fiber can be monitored in a real-time manner.

Description

A kind of multicenter simultaneously monitored distribution type optical fiber sensing equipment
Technical field:
The present invention relates to the technical field of distributed fiber temperature sensing, a kind of specifically multicenter simultaneously monitored distribution type optical fiber sensing equipment, particularly its mechanical connecting structure.
Background technology:
Distributed optical fiber temperature measurement sensing equipment 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.
The existing distributed optical fiber temperature measurement sensing equipment is made up of laser driver, laser instrument, isochronous controller, coupling mechanism, optical fiber interface, light filter, photodetector, 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 casual (Raman) spectrum of loudspeaker is responsive to temperature, we just separate the loudspeaker diffuse spectrum in the rear orientation light by coupling mechanism and optical splitter, pass through the laggard line data collection of photodetection and signal processing and amplifying again, and then the data that collect are sent to handle calculating in the data processor, finally on computers temperature data is shown.
In order to realize wider monitoring, device just need be monitored simultaneously to multi-channel optical fibre, and the existing distributed optical fiber temperature measurement sensing equipment is that the increase photoswitch is realized monitoring to multi-channel optical fibre between coupling mechanism and optical fiber interface.This mode is by software photoswitch to be switched to realize that timesharing monitors the optical fiber of not going the same way.When device monitoring first via optical fiber, by software photoswitch is switched to first via optical fiber earlier, and then send to begin to measure to instruct and measure; Again photoswitch is switched to the second road optical fiber after having surveyed first via optical fiber, then the second road optical fiber is being measured; Measure the second the tunnel and Third Road optical fiber is measured again, so the samsara circulation is monitored all road optical fiber.
Existing this mode realizes multi-channel optical fibre is monitored, the defective of existence and not enough as follows:
1, because it is by photoswitch timesharing ground multiplexed detection optical fiber to be monitored, the photoswitch restricted number detection optical fiber bar number;
2, the switching successively between each road optical fiber has enlarged to several times detection time at interval;
3, timesharing is monitored multi-channel optical fibre, occurs leaking monitoring easily;
4, photoswitch repeatedly uses back wearing and tearing easily for a long time, even damages.
In sum, still need the inner structure of existing fiber temperature measurement sensing equipment is further improved.
Summary of the invention:
The object of the present invention is to provide a kind of multicenter simultaneously monitored distribution type optical fiber sensing equipment, the distribution type optical fiber sensing equipment that this hyperchannel is real-time, do not changing detection time when reaching other parameters, the multichannel sensor fibre is monitored in real time, accomplish really, in real time the multichannel optical cable monitored simultaneously, overcome the shortcoming and defect that the existing fiber temperature measurement sensing system exists.
To achieve these goals, technical scheme of the present invention is: a kind of multicenter simultaneously monitored distribution type optical fiber sensing equipment, it comprises crust of the device, be provided with laser instrument in the shell, the output terminal of laser instrument is connected with the input end of shunt, 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, another output terminal of isochronous controller is connected with the input end of multi-channel data acquisition device, it is characterized in that: the output terminal of described shunt is connected with the input end of coupling mechanism, the output terminal of coupling mechanism is connected with the input end of light filter, the output terminal of light filter is connected with the input end of detector, the output terminal of detector is connected with amplifier input terminal, the output terminal of amplifier is connected with the input end of multi-channel data acquisition device, the coupling mechanism place is provided with optical fiber interface, the input end of isochronous controller is connected with the output terminal of data processor, and the output terminal of multi-channel data acquisition device is connected with the input end of data processor.
The invention discloses a kind of multicenter simultaneously monitored distribution type optical fiber sensing equipment, it is compared with traditional optical fibre temperature measurement sensing system, and the present invention has following advantage and good effect:
1, adopt the laser shunt can increase the bar number of the detection optical fiber that detects simultaneously to greatest extent;
2, when increasing detection optical fiber, can not increase detection time at interval;
3, realize the detection of large tracts of land, high density, multi-angle easily;
4, the device cost performance is good, system's long service life, and maintenance cost is low;
5, the real realization monitored in real time to multi-channel optical fibre.
Description of drawings:
Fig. 1 is a structural representation of the present invention
Fig. 2 is a fundamental diagram of the present invention
Embodiment:
With reference to the accompanying drawings, the present invention further is described
The present invention is a kind of multicenter simultaneously monitored distribution type optical fiber sensing equipment, it mainly comprises crust of the device 13, be provided with laser instrument 1 in the shell 13, the output terminal of laser instrument 1 is connected with the input end of shunt 3, the input end of laser instrument 1 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 10, the input end of isochronous controller 10 is connected with the output terminal of data processor 11, another output terminal of isochronous controller 10 is connected with the input end of multi-channel data acquisition device 8, it is characterized in that: the output terminal of described shunt 3 is connected with the input end of coupling mechanism 4, the output terminal of coupling mechanism 4 is connected with the input end of light filter 5, the output terminal of light filter 5 is connected with the input end of detector 6, the output terminal of detector 6 is connected with the input end of amplifier 7, the output terminal of amplifier 7 is connected with the input end of multi-channel data acquisition device 8, coupling mechanism 4 places are provided with optical fiber interface 9, the input end of isochronous controller 10 is connected with the output terminal of data processor 11, the output terminal of multi-channel data acquisition device 8 is connected with the input end of data processor 11, described shunt 3 connects 1-10 coupling mechanisms 4, each coupling mechanism 4 all is connected with a light filter 5, each light filter 5 all is connected with a detector 6, each detector 6 all is connected with an amplifier 7, and described data processor 11 is connected with computing machine 12.
Be divided into many strips laser beam by shunt after laser is injected shunt when implementing, in Fig. 1, represent with Shu Jiguang; Each sub-laser beam is separated at the coupling mechanism place with the optical fiber that is connected separately respectively as lasing light emitter separately, the spectrum that separates is remaining to the responsive loudspeaker diffuse spectrum of temperature information by light filter, the loudspeaker diffuse spectrum becomes electric signal at the detector place, sends the multiplexed signal sampling device to after being amplified by amplifier; The digital signal that data processor collects the multi pass acquisition device is handled and is calculated temperature data, finally shows on computers.
In the specific implementation, be provided with a shunt in the described device, 5 sub-laser exits are arranged, the outlet distribution mode is beneficial to gather and equipment is arranged as the basis; For example can adopt parallel mode; The port of multi pass acquisition device and optical fiber interface is arranged corresponding with the laser exit of shunt;
Wherein computing machine is a peripherals, and miscellaneous equipment is 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 laser driver (can adopt the MAX3646 type of MAXIM company) is the current driver that adopts real-time circuit production, well drive laser emission laser;
In the specific implementation, described laser instrument is semiconductor laser (can adopt the DC150-1064-PP type of PhotonicsIndustries company), can launch laser according to the drive current of Laser Driven;
In the specific implementation, described shunt adopts; The wideband operation of Shenzhen Science and Technology Ltd. of light Netcom is the standard shunt of 800nm to 1600nm;
In the specific implementation, described coupling mechanism is to adopt y-type optical fiber coupling mechanism (can adopt the J-NET-FOC-A type of Shanghai remittance two pieces of jade put together company), and the laser that it returns back scattering is told one the tunnel and passed to light filter;
In the specific implementation, described light filter adopts lens type worry mating plate (can adopt the MI1000-TiD type of precisionphotonics company) to consider light, and unnecessary light is filtered, and only stays casual (Raman) light of loudspeaker;
In the specific implementation, described detector adopts high sensitivity APD avalanche diode (can adopt the InGaAs APD type of Shenzhen Xing Bo company) to come exploring laser light, with the casual laser signal switching electrical signals of loudspeaker;
In the specific implementation, described amplifier is the big device of the high performance computing of 0PA365 type that adopts Texas Instruments;
In the specific implementation, described multichannel data processor is to adopt Beijing An Maize to become the AM-1045 data collecting card of Science and Technology Ltd. to realize;
In the specific implementation, 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;
In the specific implementation, described computing machine is a general-purpose industrial level computing machine.
As shown in Fig. 1 to Fig. 2, when computing machine sent the beginning measuring command to data processor, isochronous controller sent synchronizing pulse requirement laser driver to data processor and time schedule controller is started working simultaneously with regard to driving at once; Laser driver just begins drive laser work after receiving the synchronizing pulse that isochronous controller sends, and continuously sends laser signal in optical splitter; Laser is divided into several sub-laser by optical splitter, and each strip laser transmits in optical fiber and the back can take place to the loudspeaker diffuse scattering, and the laser signal that back scattering is returned is coupled device to be separated one the tunnel and come out to be sent to light filter; Light filter will overflow the loudspeaker in the laser signal of sending here (Raman) separate optical signals and come out, and then sends detector to, converts light signal to electric signal, and then sends electric signal to amplifier and carry out the signal processing and amplifying; The signal of crossing through processing and amplifying carries out data acquisition by parallel multi-channel data acquisition device, and the data that collect through the multi-channel data acquisition device are given data processor 11 and handled; At last real time data is given computing machine displays temperature curve.

Claims (3)

1, a kind of multicenter simultaneously monitored distribution type optical fiber sensing equipment, it comprises crust of the device (13), be provided with laser instrument (1) in the shell (13), the output terminal of laser instrument (1) is connected with the input end of shunt (3), the input end of laser instrument (1) 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 (10), the input end of isochronous controller (10) is connected with the output terminal of data processor (11), another output terminal of isochronous controller (10) is connected with the input end of multi-channel data acquisition device (8), it is characterized in that: the output terminal of described shunt (3) is connected with the input end of coupling mechanism (4), the output terminal of coupling mechanism (4) is connected with the input end of light filter (5), the output terminal of light filter (5) is connected with the input end of detector (6), the output terminal of detector (6) is connected with the input end of amplifier (7), the output terminal of amplifier (7) is connected with the input end of multi-channel data acquisition device (8), coupling mechanism (4) locates to be provided with optical fiber interface (9), the input end of isochronous controller (10) is connected with the output terminal of data processor (11), and the output terminal of multi-channel data acquisition device (8) is connected with the input end of data processor (11).
2, a kind of multicenter simultaneously monitored distribution type optical fiber sensing equipment according to claim 1, it is characterized in that: described shunt (3) connects 1-10 coupling mechanisms (4), each coupling mechanism (4) all is connected with a light filter (5), each light filter (5) all is connected with a detector (6), and each detector (6) all is connected with an amplifier (7).
3, a kind of multicenter simultaneously monitored distribution type optical fiber sensing equipment according to claim 1 is characterized in that: described data processor (11) is connected with computing machine (12).
CNU2008201525810U 2008-09-01 2008-09-01 Distributed optical fiber sensing device simultaneously monitored by multiple channels Expired - Fee Related CN201297965Y (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103135013A (en) * 2012-12-28 2013-06-05 辽宁省电力有限公司 Detecting and evaluating system of data acquisition unit
CN103727968A (en) * 2013-12-31 2014-04-16 宁波诺驰光电科技发展有限公司 Distributed type optical fiber sensing device and method for simultaneously measuring temperature, strain and vibration
CN113701653A (en) * 2020-05-22 2021-11-26 浙江中能工程检测有限公司 Nano-particle-doped PDMS flexible sensor for bridge large strain measurement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103135013A (en) * 2012-12-28 2013-06-05 辽宁省电力有限公司 Detecting and evaluating system of data acquisition unit
CN103135013B (en) * 2012-12-28 2015-12-02 辽宁省电力有限公司 Data acquisition unit test and assessment system
CN103727968A (en) * 2013-12-31 2014-04-16 宁波诺驰光电科技发展有限公司 Distributed type optical fiber sensing device and method for simultaneously measuring temperature, strain and vibration
CN103727968B (en) * 2013-12-31 2016-01-20 浙江中欣动力测控技术有限公司 The method of measuring tempeature, strain, the vibration while of a kind of
CN113701653A (en) * 2020-05-22 2021-11-26 浙江中能工程检测有限公司 Nano-particle-doped PDMS flexible sensor for bridge large strain measurement

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