CN201138253Y - Optical fiber temperature measuring and sensing system with high spatial resolution and velocity - Google Patents
Optical fiber temperature measuring and sensing system with high spatial resolution and velocity Download PDFInfo
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- CN201138253Y CN201138253Y CNU2008200548961U CN200820054896U CN201138253Y CN 201138253 Y CN201138253 Y CN 201138253Y CN U2008200548961 U CNU2008200548961 U CN U2008200548961U CN 200820054896 U CN200820054896 U CN 200820054896U CN 201138253 Y CN201138253 Y CN 201138253Y
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Abstract
The utility model discloses a fine spatial resolution and high-speed optical fiber pyrometric sensing system, which is characterized in that the two ends of a data collector are connected with one end of a time schedule controller and one end of a signal synthesizer respectively; the two ends of an isochronous controller are connected with the other end of the time schedule controller and one end of a data processor respectively; the other end of the data processor is connected with the other end of the signal synthesizer. Compared with the traditional optical fiber pyrometric sensing system, the fine spatial resolution and high-speed optical fiber pyrometric sensing system has the advantages that: 1. a plurality of data collectors are adopted for collecting data concurrently, and the spatial resolution is reduced; 2. a high-speed FPGA is used for processing data, thus accelerating data processing. The fine spatial resolution and high-speed optical fiber pyrometric sensing system can reduce the spatial resolution to a great extent while ensuring the temperature measurement precision, and the data collector at the speed of 100Mbs can reach the spatial resolution of 0.2 meter. In addition, the high-speed FPGA is adopted for data processing, thus improving the responding speed of the system.
Description
Technical field
The utility model relates to the technical field of monitoring temperature, a kind of specifically optical fibre temperature measurement sensing system with high spatial resolution and high velocity, particularly its equipment connection structure.
Background technology
Optical fibre temperature measurement sensing system 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 fibre temperature measurement sensing system is made up of laser driver, laser instrument, isochronous controller, coupling mechanism, calibration cell, reference optical fiber, optical splitter, 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, can the loudspeaker diffuse spectrum in the rear orientation light be separated by coupling mechanism and optical splitter, 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 optical fiber sensing system, spatial resolution is a crucial parameter, when measuring temperature field information, always wishes that spatial resolution is as much as possible little, requires the precision of thermometric high as much as possible again simultaneously, also needs system to have detection feature fast.For improving spatial resolution, must improve the speed of data acquisition unit sampling, the transfer rate of laser in sensor fibre is about 2 * 10
8M/s is satisfied 1 meter spatial resolution, and the speed of data acquisition unit will reach 100Mb/s (the not influence of taking into account system bandwidth here); Improve the temperature measurement accuracy inevitable requirement and increase the data acquisition unit sampling resolution, temperature signal is submerged among the noise, thus actual samples to as if having a signal of noise.Experiment showed, if the thermometric range of system is-250～700 ℃, in order to guarantee ± 2 ℃ temperature measurement accuracy that the data acquisition unit figure place must not be lower than 10; And the high sampling rate of data acquisition unit and high sampling resolution are two parameters of mutual restriction; Therefore, spatial resolution is difficult to accomplish very little existing fiber temperature sensing system under the situation of temperature measurement accuracy satisfying.Existing in addition optical fibre temperature measurement sensing system adopts computing machine to do data processing, and computing machine is not in time to handle to the data of sending here, and this has just influenced the optical fibre temperature measurement sensing system data processing speed, thereby influences the detection response speed of system.
So still need prior art is further improved.
Summary of the invention
The purpose of this utility model is to provide a kind of optical fibre temperature measurement sensing system with high spatial resolution and high velocity, it can accomplish spatial resolution very little when guaranteeing temperature measurement accuracy, the data acquisition unit of 100Mbs speed can reach 0.2 meter spatial resolution, and adopt high speed FPGA to carry out data processing, improve system response time, overcome the shortcoming and defect that exists in the prior art.
To achieve these goals, technical scheme of the present invention is: a kind of optical fibre temperature measurement sensing system with high spatial resolution and high velocity, it comprises laser instrument, one end of laser instrument is connected with an end of laser driver, the other end of laser instrument is connected with an end of coupling mechanism, the other end of laser driver is connected with an end of isochronous controller, the other two ends of coupling mechanism respectively with an end of optical splitter, reference optical fiber connects, and reference optical fiber places in the calibration cell, the other end of optical splitter is connected with photoelectric commutator one end, the other end of photoelectric commutator is connected with an end of signal amplifier, the other end of signal amplifier is connected with an end of data acquisition unit, it is characterized in that: the other two ends of described data acquisition unit respectively with an end of time schedule controller, one end of signal synthesizer connects, the other two ends of isochronous controller respectively with the other end of time schedule controller, one end of data processor connects, and the other end of data processor is connected with the other end of signal synthesizer.
The utility model discloses a kind of optical fibre temperature measurement sensing system with high spatial resolution and high velocity, it compares the utility model with traditional optical fibre temperature measurement sensing system following advantage and good effect, 1, adopts a plurality of data acquisition unit parallel acquisition data, dwindled spatial resolution; 2, use high speed FPGA to come deal with data, accelerated data processing speed.It can accomplish spatial resolution very little when guaranteeing temperature measurement accuracy, and the data acquisition unit of 100Mbs speed can reach 0.2 meter spatial resolution, and adopts high speed FPGA to carry out data processing, improves system response time.
Description of drawings
Below in conjunction with accompanying drawing and specific embodiment of the utility model the utility model is described in further detail:
Fig. 1 is the utility model structural representation;
Fig. 2 is the utility model sample circuit fundamental diagram;
Fig. 3 is the utility model fundamental diagram.
Embodiment
With reference to the accompanying drawings, the utility model further is described
The utility model is a kind of optical fibre temperature measurement sensing system with high spatial resolution and high velocity, it mainly comprises laser instrument 1, one end of laser instrument 1 is connected with an end of laser driver 2, the other end of laser instrument 1 is connected with an end of coupling mechanism 3, the other end of laser driver 2 is connected with an end of isochronous controller 4, the other two ends of coupling mechanism respectively with an end of optical splitter, reference optical fiber connects, and reference optical fiber places in the calibration cell, the other end of optical splitter is connected with photoelectric commutator one end, the other end of photoelectric commutator is connected with an end of signal amplifier, the other end of signal amplifier is connected with an end of data acquisition unit, it is characterized in that: the other two ends of described data acquisition unit respectively with an end of time schedule controller, one end of signal synthesizer connects, the other two ends of isochronous controller respectively with the other end of time schedule controller, one end of data processor connects, and the other end of data processor is connected with the other end of signal synthesizer.
In the specific implementation, can be provided with 2～100 data acquisition units 10 in the described system, become parallel arranged between the data acquisition unit, differ 360 °/N on the phase place each other, the quantity of N representative data collector, described data processor 13 can connect computing machine 14.
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.
Described laser driver (can adopt MAXIM company
MAX3646Type) is the current driver that adopts high speed circuit to make, well drive laser emission laser;
Described laser instrument is semiconductor laser (can adopt the DC150-1064-PP type of Photonics Industries company), can launch laser according to the drive current of Laser Driven;
Described coupling mechanism is to adopt y-type optical fiber coupling mechanism (can adopt the J-NET-FOC-A type with 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 optical splitter;
Described optical splitter 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 the casual light of loudspeaker;
Described photoelectric commutator 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;
Described amplifier is the big device of the high performance computing of OPA365 type that adopts Texas Instruments;
Described data acquisition unit can adopt Texas Instruments high speed data acquisition system (
ADS62P15Type), travelling speed is 100Mb/s;
Described time schedule controller can adopt the phase localizer (CDC2586 type) of Texas Instruments to realize;
Described synthesizer is that the signal that each data acquisition unit collection comes is stacked up, and then gives data processor and handle;
Described data processor is to adopt the Cyclone II high speed field programmable gate array (FPGA) of ALTERA company to realize;
Described calibration cell is the box of a sealing, controls its temperature at 25 ℃ by external circuit, can adopt the KSD type temperature controller of Shenzhen Yi Limei company;
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;
The used optical fiber of described reference optical fiber and detecting optical cable is identical;
Described computing machine is a general-purpose industrial level computing machine.
As shown in fig. 1, the part of data acquisition of the utility model fiber optic high-resolution temperature measurement sensing system is to adopt the work of " walking abreast " of a plurality of data acquisition units to improve sampling rate." walk abreast " and be meant that the sampling time alternately, its principle of work is as follows: a plurality of data acquisition units are used in data acquisition, employed sampling clock frequency identical (the employing frequency is 100Mb/s), but on phase place, differ 360 °/N (wherein N is the number of parallel data acquisition device) each other; All data acquisition units are all sampled at the rising edge of clock, so in a clock period, each data acquisition unit is once sampled in turn, result of equal value is that sampling rate has improved N doubly.With N=5 is example, the clock frequency of 5 data acquisition units is identical, 72 ° of phase phasic differences, as shown in Figure 2,5 circuit-switched data collectors use " pulse 1 ", " pulse 2 ", " pulse 3 ", " pulse 4 " and " pulse 5 " to obtain " sampling 1 ", " sampling 2 ", " sampling 3 ", " sampling 4 " and " sampling 5 " respectively, 5 circuit-switched data are carried out comprehensive result just obtain " the comprehensive employing ".Though as seen clock frequency is constant, actual sample frequency has improved 5 times.The sequential of multichannel data sampling thief realizes by time schedule controller.
As shown in Fig. 1 to Fig. 3, 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 fiber; 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 optical splitter; Optical splitter will overflow the loudspeaker in the laser signal of sending here separate optical signals and come out, and then sends photoelectric commutator to and convert 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 data acquisition unit, the data that collect through the parallel data acquisition device are sent to signal synthesizer again and carry out overall treatment, and then the data after will be comprehensive are given high speed FPGA data processing and handled; Time schedule controller moves timing control program after receiving the synchronizing pulse that isochronous controller sends, and makes parallel data acquisition unit carry out data collection task in proper order according to certain in turn; After FPGA high-speed data processor data processed is fed to computing machine displays temperature curve.
Laser instrument 1 described in the utility model; laser driver 2; coupling mechanism 3; isochronous controller 4; optical splitter 5; reference optical fiber 6; calibration cell 7; photoelectric commutator 8; signal amplifier 9; data acquisition unit 10; time schedule controller 11; signal synthesizer 12; data processor 13; the internal circuit and the inner structure of computing machine 14 are prior art; it or not the claimed scope of the utility model; so be not further described at this; the utility model is claimed is annexation between them; described laser instrument 1; laser driver 2; coupling mechanism 3; isochronous controller 4; optical splitter 5; reference optical fiber 6; calibration cell 7; photoelectric commutator 8; signal amplifier 9; data acquisition unit 10; time schedule controller 11; signal synthesizer 12; data processor 13 is enclosed in the casing, is to make as a whole product to use.
Claims (3)
1, a kind of optical fibre temperature measurement sensing system with high spatial resolution and high velocity, it comprises laser instrument (1), one end of laser instrument (1) is connected with an end of laser driver (2), the other end of laser instrument (1) is connected with an end of coupling mechanism (3), the other end of laser driver (2) is connected with an end of isochronous controller (4), the other two ends of coupling mechanism (3) respectively and an end of optical splitter (5), reference optical fiber (6) connects, and reference optical fiber (6) places in the calibration cell (7), the other end of optical splitter (5) is connected with photoelectric commutator (8) one ends, the other end of photoelectric commutator (8) is connected with an end of signal amplifier (9), the other end of signal amplifier (9) is connected with an end of data acquisition unit (10), it is characterized in that: the other two ends of described data acquisition unit (10) respectively and an end of time schedule controller (11), one end of signal synthesizer (12) connects, the other two ends of isochronous controller (4) respectively and the other end of time schedule controller (11), one end of data processor (13) connects, and the other end of data processor (13) is connected with the other end of signal synthesizer (12).
2, a kind of optical fibre temperature measurement sensing system according to claim 1 with high spatial resolution and high velocity, it is characterized in that: can be provided with 2-100 platform data acquisition unit (10) in the described system, become parallel arranged between the data acquisition unit, differ 360 °/N on the phase place each other, the quantity of N representative data collector.
3, a kind of optical fibre temperature measurement sensing system with high spatial resolution and high velocity according to claim 1, it is characterized in that: described data processor (13) can connect computing machine (14).
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| CNU2008200548961U CN201138253Y (en) | 2008-01-18 | 2008-01-18 | Optical fiber temperature measuring and sensing system with high spatial resolution and velocity |
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| CNU2008200548961U CN201138253Y (en) | 2008-01-18 | 2008-01-18 | Optical fiber temperature measuring and sensing system with high spatial resolution and velocity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106323500A (en) * | 2015-07-08 | 2017-01-11 | 中国电力科学研究院 | Temperature self-calibration type optical fiber Raman temperature measuring system and calibration method thereof |
| CN108109319A (en) * | 2017-12-11 | 2018-06-01 | 山西省交通科学研究院 | It is a kind of by distributed optical fiber temperature measurement data integration in the method for tunnel comprehensive monitoring system |
-
2008
- 2008-01-18 CN CNU2008200548961U patent/CN201138253Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106323500A (en) * | 2015-07-08 | 2017-01-11 | 中国电力科学研究院 | Temperature self-calibration type optical fiber Raman temperature measuring system and calibration method thereof |
| CN106323500B (en) * | 2015-07-08 | 2019-11-19 | 中国电力科学研究院 | A kind of self-alignment optical fiber Raman thermometry system of realization temperature and its calibration method |
| CN108109319A (en) * | 2017-12-11 | 2018-06-01 | 山西省交通科学研究院 | It is a kind of by distributed optical fiber temperature measurement data integration in the method for tunnel comprehensive monitoring system |
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| DD01 | Delivery of document by public notice |
Addressee: SHANGHAI HUAWEI AT Co., Ltd. Document name: Notification to Pay the Fees |
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| DD01 | Delivery of document by public notice |
Addressee: SHANGHAI HUAWEI AT Co., Ltd. Document name: Notification of Termination of Patent Right |
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Granted publication date: 20081022 Termination date: 20130118 |