CN203177997U - Positioning temperature-measurement device formed by combining fiber gratings and distributed fiber - Google Patents
Positioning temperature-measurement device formed by combining fiber gratings and distributed fiber Download PDFInfo
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- CN203177997U CN203177997U CN201320206834.9U CN201320206834U CN203177997U CN 203177997 U CN203177997 U CN 203177997U CN 201320206834 U CN201320206834 U CN 201320206834U CN 203177997 U CN203177997 U CN 203177997U
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Abstract
Disclosed is a positioning temperature-measurement device formed by combining fiber gratings and a distributed fiber and the device belongs to the field of photoelectric measurement. An LD light source and a BBS light source are connected with a shunt port of a beam combiner through the fiber. A sensor group is composed of M distributed fiber sensors and fiber-grating sensors serially connected to the distributed fiber sensors, wherein each of the distributed-fiber sensors is provided with (1-n) fiber-grating sensors. The sensor group is connected with a port (a) of a light switch and a port (b) of the light switch is connected with a port (c) of an optical splitter. A port (d) of the optical splitter is connected with the public port of the beam combiner. A port (e) of the optical splitter is connected with input ends of an OTDR demodulator and a fiber grating reflection spectrum wavelength demodulator respectively. Output ends of the OTDR demodulator and the fiber grating reflection spectrum wavelength demodulator are connected with a signal processing unit. And the signal processing unit is connected with a computer unit taking charge of control, collection, display and storage. The advantages of the positioning temperature-measurement device are that through use of a single fiber, wide-range distributed temperature-sensing measurement and accurate positioning measurement of a specific position can be realized.
Description
Technical field
The utility model belongs to a kind of field of measuring technique, particularly a kind of location temperature measuring equipment that is combined by fiber grating and distribution type fiber-optic.
Background technology
At present, be divided into two kinds of distributing optical fiber sensing technology and fiber grating sensing technologies based on the sensing technology of optical fiber, it respectively has relative merits:
(1) in the distributing optical fiber sensing technology measurement utilization of temperature be the spontaneous Raman scattering effect of light.By this effect, STOKES light and the anti-STOKES light that wavelength is shorter that wavelength is longer will be produced.Thereby, can instead know the fiber optic temperature that produces spontaneous Raman scattering effect place by inference by measuring light intensity.And utilize the OTDR technology, the time delay of measuring light pulse can be measured distance, realizes the space orientation in the optical fiber.In the distributing optical fiber sensing technology, optical fiber is transmission medium, is again sensor information.Its advantage is to measure whole piece optical fiber.Depend on pulse width and the energy of light pulse but shortcoming is its bearing accuracy, can realize about 1 meter bearing accuracy usually, temperature measurement accuracy is about 1 degree.
What (2) fiber grating sensing technology then utilized is that the periodic refractive index that forms in optical fiber distributes.Because interference effect will make the light that satisfies certain wavelength condition be reflected back, the light of other wavelength is transmissive then.And because thermo-optic effect and elasto-optical effect, catoptrical wavelength will drift about along with the variation of temperature, strain etc.Thereby by detecting wave length shift, can realize the measurement of physical quantitys such as temperature, strain.Fiber grating by at an optical fiber serial connection different wave length also can constitute the fiber-optic grating sensor with accurate distribution character.The advantage of fiber grating sensing technology is that measuring accuracy is higher, can reach 0.1 degree, the bearing accuracy height can be as accurate as the zone of the residing about 1cm of fiber grating, and this is for needing the field of accurate location survey very important as the load concentration district of electric system bus-bar, heavy construction etc.But shortcoming is the optical fiber between each optical fiber grating sensing point only to be used for connecting, and can't carry out sensing measurement.
Some on a large scale, the thermometric of many check points, for example: for the monitoring temperature of zones of different in the large-scale iron and steel enterprise, method in the past is separately independently temperature detection monitoring to be carried out in certain thermometric zone, or even directly entered by the people in the hazardous environment of high temperature, high noisy and an easy mechanical wounding, measure the temperature in relevant device and zone by infrared temperature-measuring gun.Some position is difficult to personnel and enters, as cable trough (ditch), bury down or overhead gas pipeline, coal charge are stacked the blind area that place etc. becomes monitoring temperature especially.But the hidden danger position that takes place frequently of great industrial accident exactly, these places just.Because limiting factors such as place, distance, realization cost, thermometric mode are difficult to realize this regional monitoring temperature.More can not realize by a device end bulk temperature monitoring being carried out in the place, the zone that all need thermometric like this.Even if optical fiber temperature-measurement equipment has been installed, but it also can only be single thermometric mode at the specific region.As electrical control cubicles: a fiber-optic grating sensor can be installed in each switch board, but be connected to the power cable in the electrical control cubicles and lay in the pipeline of cable temperature and can't monitor, as also needing the power cable be carried out monitoring temperature, just need purchase equipment in addition.Limited the scope of application of such temperature measurement equipment like this, centralized multi-object thermometric network just can not be realized.
The utility model content
The purpose of this utility model is to overcome above-mentioned defective, and a kind of location temperature measuring equipment that is combined by fiber grating and distribution type fiber-optic is provided, and utilizes an optical fiber equally, is connected in series some fiber gratings therein and carries out point type and accurately measure; Simultaneously, adopt the pump light that is different from optic fiber grating wavelength to incide in the optical fiber, lure that it produces spontaneous Ramam effect into, measure thereby whole piece optical fiber is carried out temperature sensing as the Raman fiber sensor; Like this, can utilize an optical fiber both to realize that distributed temperature sensing was measured on a large scale, can realize the accurate location survey for ad-hoc location again.
The purpose of this utility model is achieved through the following technical solutions: a kind of location temperature measuring equipment that is combined by fiber grating and distribution type fiber-optic, and it is characterized in that: it comprises light source, sensor groups, bundling device, optical splitter, photoswitch and detuner;
Said light source comprises LD light source and BBS light source, and the LD light source is connected with the branch road port of bundling device by optical fiber with the BBS light source;
Said sensor groups is made up of 1-n the fiber-optic grating sensor of connecting on M root distributed fiberoptic sensor and the every distributed fiberoptic sensor;
Said sensor groups is connected with first fen road port a of photoswitch, second fen road port b of photoswitch is connected with first fen road port c of optical splitter, second fen road port d of optical splitter is connected with the public port of bundling device, the 3rd fen road port e of optical splitter is connected with the input end of fiber grating reflectance spectrum wavelengt demodulator and OTDR detuner respectively, and the output terminal of fiber grating reflectance spectrum wavelengt demodulator and OTDR detuner is connected with signal processing unit; This signal processing unit is connected with the computer unit of being responsible for control, collection, demonstration and storage.
1-64 fiber-optic grating sensor of described distributed fiberoptic sensor serial connection.
Described fiber-optic grating sensor is the fiber-optic grating sensor with different centre wavelengths.
Described LD light source is for producing the needed pulse pump light of Raman scattering, and wavelength is 1630nm.
Described BBS light source is wideband light source, and the wavelength of BBS light source and the wavelength of fiber-optic grating sensor are 1525-1565nm.
Described fiber-optic grating sensor comprises the fiber grating by the parcel 353ND bicomponent epoxy resin layer of heat conductive silica gel adhesive package, suit package tube outside 353ND bicomponent epoxy resin layer, fill heat conductive silica gel in the package tube, the two ends of package tube are the fastening end mother fixedly, and the female metal armour with distribution type fiber-optic in fastening end is fixed by quoit.
Advantage of the present utility model and beneficial effect are:
1, optical fiber grating temperature-measuring and two kinds of technology of distributed optical fiber temperature measurement are combined, utilize an optical fiber equally, be connected in series some fiber gratings therein and carry out point type and accurately measure.Like this, can utilize an optical fiber both to realize that distributed temperature sensing was measured on a large scale, can realize the accurate location survey for ad-hoc location again.Compare with traditional product, solved that the optical fiber between each optical fiber grating sensing point in the low shortcoming of its measurement and bearing accuracy in single distributing optical fiber sensing technology and the fiber grating sensing technology only is used for connecting and the shortcoming that can't measure.
2, be applicable to the all-environment thermometric mode in multiple large-scale factory, ore deposit, enterprise, tunnel, realize the multi-object thermometric sensing network that centralized control shows, have high stability and high reliability, enlarged application, reduced system cost and maintenance cost.
Description of drawings:
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the utility model fiber-optic grating sensor structural representation.
Among the figure: 1-LD light source, 2-BBS light source, 3-optical fiber, 4-bundling device, the 5-optical splitter, 6-distributed fiberoptic sensor, 7-fiber-optic grating sensor, 8-fiber grating reflectance spectrum wavelengt demodulator, the 9-OTDR detuner, 10-signal processing unit, 11-computer unit, 12-photoswitch, 13-heat conductive silica gel bonding agent, 14-353ND bicomponent epoxy resin layer, 15-fiber grating, the 16-package tube, 17-heat conductive silica gel, 18-fastening end mother, the 19-quoit, 20-metal armour, 21-sensor groups.
Embodiment:
Below in conjunction with accompanying drawing and preferred embodiment, embodiment, structure, the feature that the foundation utility model is provided and attack effect is described in further detail;
Shown in Fig. 1-2, a kind of location temperature measuring equipment that is combined by fiber grating and distribution type fiber-optic, wherein,
Select LD light source 1 and BBS light source 2 for use, be connected with the branch road port f of bundling device 4 by optical fiber 3, the LD light source is for producing the needed pulse pump light of Raman scattering, and wavelength is 1630nm; The BBS light source is wideband light source, and the wavelength of BBS light source is 1525-1565nm;
According to the quantity of the required metering contact in scene what, sensor groups 21 is made up of 1-64 the fiber-optic grating sensor 7 of connecting on M root distributed fiberoptic sensor 6 and the every distributed fiberoptic sensor 6; Because BBS optical source wavelength scope width has limited and can connect the fiber-optic grating sensor maximum quantity under the single fiber passage in 64, in order to expand fiber-optic grating sensor quantity, can adopt the space division multiplexing technology, connect hyperchannel electric control optical switch device, travel through all passages by programmed control, can realize the technical purpose of multiple spot multi-channel detection thus, can connect multi-channel fiber Bragg grating sensor and distributed fiberoptic sensor, each fiber-optic grating sensor 7 has different centre wavelengths, and wavelength is 1525-1565nm;
Sensor groups 21 is connected with first fen road port a of photoswitch 12, second fen road port b of photoswitch 12 is connected with first fen road port c of optical splitter 5,5 second fens road port d of optical splitter are connected with the public port g of bundling device 4, the 3rd fen road port e of optical splitter 5 is connected with the input end of fiber grating reflectance spectrum wavelengt demodulator 8 and OTDR detuner 9 respectively with the 4th fen road port f, and the output terminal of fiber grating reflectance spectrum wavelengt demodulator 8 and OTDR detuner 9 is connected with signal processing unit 10; This signal processing unit 10 is connected with the computer unit 11 of being responsible for control, collection, demonstration and storage.
This device connects computer unit, and computer unit disposes with known acoustic-optic alarm, can realize early warning and alarming.
Described fiber-optic grating sensor 7 is the fiber grating 15 of encapsulation, its structure is: comprise the fiber grating 15 by the parcel 353ND bicomponent epoxy resin layer 14 of heat conductive silica gel bonding agent 13 encapsulation, suit package tube 16 outside 353ND bicomponent epoxy resin layer 14, fill heat conductive silica gel 17 in the package tube 16, the two ends of package tube 16 are fastening end mother 18 fixedly, and fastening end female 18 is fixing by quoit 19 with the metal armour 20 of distributed fiberoptic sensor 6; Described encapsulating structure includes but not limited to above-mentioned packaging system, fiber grating through this encapsulation can amplify temperature variation, and eliminate the influence of stress and pressure basically, thereby the raising measuring accuracy also makes optical fiber gate sensor measurement range be expanded.
Principle of work of the present utility model is: the light that LD light source issued light and BBS light source send is coupled into an optical fiber simultaneously, incide in the distributed fiberoptic sensor by optical splitter, also incide in the fiber-optic grating sensor group that is serially connected in the distributed fiberoptic sensor simultaneously.Inciding the wavelength of the BBS light source in the fiber-optic grating sensor group and the wavelength of each fiber-optic grating sensor is that 1525nm is between the 1565nm.The STOKES optical wavelength that the Raman scattering of distribution type fiber-optic produces will be about 1630nm, and anti-STOKES optical wavelength will be about 1430nm.The Rayleigh scattering that distributed fiberoptic sensor returns is only with LD pulse pump light co-wavelength.Because the wavelength that the fiber-optic grating sensor that we design returns has been avoided this wavelength, can not impact it.Therefore be easy to by the WDM light-splitting device the return signal of two different wave lengths separately accomplish to be independent of each other.After the WDM light splitting, the signal that each fiber-optic grating sensor returns then can come out the Wavelength demodulation of each fiber grating by tunable optic filter; The signal that distributed fiberoptic sensor returns utilizes the OTDR detuner to carry out Fibre Optical Sensor signal extraction.
The above only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment does.
Claims (6)
1. location temperature measuring equipment that is combined by fiber grating and distribution type fiber-optic, it is characterized in that: it comprises light source, sensor groups, bundling device, optical splitter, photoswitch and detuner;
Said light source comprises LD light source and BBS light source, and the LD light source is connected with the branch road port of bundling device by optical fiber with the BBS light source;
Said sensor groups is made up of 1-n the fiber-optic grating sensor of connecting on M root distributed fiberoptic sensor and the every distributed fiberoptic sensor;
Said sensor groups is connected with first fen road port a of photoswitch, second fen road port b of photoswitch is connected with first fen road port c of optical splitter, second fen road port d of optical splitter is connected with the public port of bundling device, the 3rd fen road port e of optical splitter is connected with the input end of fiber grating reflectance spectrum wavelengt demodulator and OTDR detuner respectively, and the output terminal of fiber grating reflectance spectrum wavelengt demodulator and OTDR detuner is connected with signal processing unit; This signal processing unit is connected with the computer unit of being responsible for control, collection, demonstration and storage.
2. a kind of location temperature measuring equipment that is combined by fiber grating and distribution type fiber-optic as claimed in claim 1 is characterized in that: 1-64 fiber-optic grating sensor of described distributed fiberoptic sensor serial connection.
3. a kind of location temperature measuring equipment that is combined by fiber grating and distribution type fiber-optic as claimed in claim 1, it is characterized in that: described fiber-optic grating sensor is the fiber-optic grating sensor with different centre wavelengths.
4. a kind of location temperature measuring equipment that is combined by fiber grating and distribution type fiber-optic as claimed in claim 1 is characterized in that: described LD light source is for producing the needed pulse pump light of Raman scattering, and wavelength is 1630nm.
5. a kind of location temperature measuring equipment that is combined by fiber grating and distribution type fiber-optic as claimed in claim 1, it is characterized in that: described BBS light source is wideband light source, the wavelength of BBS light source and the wavelength of fiber-optic grating sensor are 1525-1565nm.
6. a kind of location temperature measuring equipment that is combined by fiber grating and distribution type fiber-optic as claimed in claim 1, it is characterized in that: described fiber-optic grating sensor comprises the fiber grating by the parcel 353ND bicomponent epoxy resin layer of heat conductive silica gel adhesive package, suit package tube outside 353ND bicomponent epoxy resin layer, fill heat conductive silica gel in the package tube, the two ends of package tube are the fastening end mother fixedly, and the female metal armour with distribution type fiber-optic in fastening end is fixed by quoit.
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| CN201320206834.9U CN203177997U (en) | 2013-04-23 | 2013-04-23 | Positioning temperature-measurement device formed by combining fiber gratings and distributed fiber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267590A (en) * | 2013-04-23 | 2013-08-28 | 天津市东方龙光电测控技术有限公司 | Locating temperature measuring device combining fiber gratings and distributed optical fibers |
| CN104613321A (en) * | 2015-01-30 | 2015-05-13 | 武汉工程大学 | Nuclear power plant pipeline leakage detection device and method based on distributed optical fiber temperature measurement |
| CN113465656A (en) * | 2021-04-30 | 2021-10-01 | 潍坊嘉腾液压技术有限公司 | Tester for detecting fluid composite parameters and data processing method |
-
2013
- 2013-04-23 CN CN201320206834.9U patent/CN203177997U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267590A (en) * | 2013-04-23 | 2013-08-28 | 天津市东方龙光电测控技术有限公司 | Locating temperature measuring device combining fiber gratings and distributed optical fibers |
| CN104613321A (en) * | 2015-01-30 | 2015-05-13 | 武汉工程大学 | Nuclear power plant pipeline leakage detection device and method based on distributed optical fiber temperature measurement |
| CN113465656A (en) * | 2021-04-30 | 2021-10-01 | 潍坊嘉腾液压技术有限公司 | Tester for detecting fluid composite parameters and data processing method |
| CN113465656B (en) * | 2021-04-30 | 2023-08-15 | 潍坊嘉腾液压技术有限公司 | Tester for detecting fluid composite parameters and data processing method |
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