CN204555997U - A kind of positioning optical fiber grating sensing device - Google Patents
A kind of positioning optical fiber grating sensing device Download PDFInfo
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- CN204555997U CN204555997U CN201520236747.7U CN201520236747U CN204555997U CN 204555997 U CN204555997 U CN 204555997U CN 201520236747 U CN201520236747 U CN 201520236747U CN 204555997 U CN204555997 U CN 204555997U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 22
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- 238000000034 method Methods 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 3
- 230000004044 response Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 7
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- 230000005540 biological transmission Effects 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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Abstract
The utility model discloses a kind of positioning optical fiber grating sensing device, laser instrument sends light signal to optical splitter, light signal is divided into two-way light and is delivered to circulator a and circulator b respectively by described optical splitter, the two ends of described circulator a and circulator b output terminal connecting fiber grating sensor, described circulator a returns port through photodetector a connection data collector, described circulator b returns port through photodetector b connection data collector, and described data acquisition unit connects computing machine through data processor.This device adopts high-speed AD acquisition chip and special data processing fpga chip to do data acquisition and processing (DAP), improves the response speed of optical fiber sensing system.Utilize this method, can realize positioning fiber-optic grating sensor under the prerequisite increasing little hardware.System architecture is simple, and overall system cost is lower.
Description
Technical field
The utility model relates to fiber bragg grating sensing device, particularly relates to a kind of two-way positioning optical fiber grating sensing device.
Background technology
Fiber-optic grating sensor due to its structure simple, detection range is long, is not subject to the features such as electromagnetic interference (EMI), has become the study hotspot of recent domestic.Fiber-optic grating sensor is the technology of the field active demands such as national defence, oil pipeline, electric power, and this technology can be used for temperature, pressure, the isoparametric situation of stress at Real-Time Monitoring scene.Fiber grating be a kind of by certain method make fiber core refractive index generation axial cyclic modulation and formed diffraction grating, be a kind of passive filtering device.Because grating fibers has, volume is little, splice loss, splice attenuation is little, be entirely compatible with optical fiber, can imbed the advantages such as intellectual material, and the change of its resonance wavelength to external environments such as temperature, strain, refractive index, concentration is more responsive, is therefore widely used in optical fiber communication and sensory field.
In fiber bragg grating sensing device, the location of sensor is the technological difficulties of optical fiber sensing network always.Existing technology is sensing and the location that the method adopting optical time domain reflection technology (OTDR) and wavelength-modulation technique to combine realizes Fibre Optical Sensor sensor.Adopt wavelength-modulation technique to realize the measurement of fiber-optic grating sensor parameter to external world, adopt the location that optical time domain reflection technology realizes fiber-optic grating sensor.But, the realization of optical time domain reflection technology (OTDR), control circuit that the is complicated and composition such as the pulse-modulator of costliness, Function drive is needed to support, whole system cost is very high, expensive, be applicable to high-end applications occasion, greatly limit applying of fiber bragg grating sensing device.
Utility model content
Technical problem to be solved in the utility model realizes the fiber grating that a kind of structure is simplified, system cost is lower to position sensing device.
To achieve these goals, the technical solution adopted in the utility model is: positioning optical fiber grating sensing device, laser instrument sends light signal to optical splitter, light signal is divided into two-way light and is delivered to circulator a and circulator b respectively by described optical splitter, the two ends of described circulator a and circulator b output terminal connecting fiber grating sensor, described circulator a returns port through photodetector a connection data collector, described circulator b returns port through photodetector b connection data collector, and described data acquisition unit connects computing machine through data processor.
The utility model can realize positioning fiber-optic grating sensor under the prerequisite increasing little hardware, make system architecture simple, overall cost is lower, and adopts high-speed data acquisition chip and special FPGA data processing chip, improves the response speed of optical fiber sensing system.
Accompanying drawing explanation
Below the content that width accompanying drawing every in the utility model instructions is expressed is briefly described:
Fig. 1 is the structural representation of positioning optical fiber grating sensing device;
Fig. 2 is the positioning principle figure of positioning optical fiber grating sensing device.
Embodiment
As shown in Figure 1, positioning optical fiber grating sensing device comprises laser instrument 1, optical splitter 2, circulator, fiber-optic grating sensor 5, photodetector, data acquisition unit 8, data processor 9, computing machine 10.Its Computer 10 and fiber-optic grating sensor 5 are peripherals, and other equipment are enclosed in a casing, and computing machine 10 is undertaken communicating by data communication interface and data processor 9 and reads internal data, and data is presented on graphical interfaces.Below all parts is described in detail:
Laser instrument 1, adopts tunable laser 1, realizes the scanning in a wavelength range;
Light splitter toy 2, is divided into two-way for the light signal exported by laser instrument 1, and the splitting ratio of two-way light is 1:1;
Circulator, adopting optical fiber circulator, for being separated by the optical grating reflection returned in optical fiber light, exporting to photodetector;
Photodetector, adopts high sensitivity APD avalanche diode to carry out exploring laser light, by light signal switching electrical signals;
Data acquisition unit 8, adopt high-speed data acquisition chip, travelling speed is 100Mb/s;
Data processor 9, adopts high speed FPGA process chip, realizes carrying out treatment and analysis to rear orientation light;
Computing machine 10, adopts technical grade computing machine 10, realizes storage and the displaying of data.
Laser instrument 1 has wavelength constant velocity linear scan characteristic for tunable optical source, by arranging the length scanning order of tunable optical source, long wave is scanned respectively from shortwave, output wavelength scope is the laser signal of 1525nm-1565nm, the light signal that laser instrument 1 exports is divided into impartial two-way light by Light splitter toy 2, and two-way light is input to optical fiber grating sensing section respectively through the input port of two optical fiber circulators.Wherein circulator a3 inputs from one end of optical fiber grating sensing section, circulator b4 inputs from the other end of optical fiber grating sensing section, the light signal exported from circulator a3 reflects back into circulator a3 via fiber-optic grating sensor 5, and be transported to photodetector a7 by the port that returns of circulator a3, in like manner, the light signal exported from circulator b4 reflects back into circulator b4 via fiber-optic grating sensor 5, and be transported to photodetector b6 by the port that returns of circulator b4, then reflected by same fiber grating the distance that the rear mistiming arriving photodetector a7 and photodetector b6 just can calculate this fiber-optic grating sensor 5 range finder by calculating light.
As shown in Figure 2, if the total length of optical fiber grating sensing section is L, the distance of a certain fiber-optic grating sensor 5 range finder is X
1, the distance of this sensor distance optical fiber grating sensing end is X
2, then have
X
2＝L-X
1(1)
Light transmission speed is in a fiber V, then can obtain
V·t
1＝X
1(2)
V·t
2＝L+X
2(3)
Formula (3) is deducted formula (2) obtain
V(t
2-t
1)＝L+X
2-X
1(4)
By X
2=L-X
1, t
2-t
1=△ t brings formula (4) into and obtains:
V·△t＝L+L-X
1-X
1＝2L-2X
1(5)
Therefore, the distance X of grating sensor range finder can be obtained from formula (5)
1for:
X
1＝(2L-V·△t)/2 (6)
By reference to the accompanying drawings the utility model is exemplarily described above; obvious the utility model specific implementation is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present utility model is conceived and technical scheme is carried out; or design of the present utility model and technical scheme directly applied to other occasion, all within protection domain of the present utility model without to improve.
Claims (1)
1. a positioning optical fiber grating sensing device, it is characterized in that: laser instrument sends light signal to optical splitter, light signal is divided into two-way light and is delivered to circulator a and circulator b respectively by described optical splitter, the two ends of described circulator a and circulator b output terminal connecting fiber grating sensor, described circulator a returns port through photodetector a connection data collector, described circulator b returns port through photodetector b connection data collector, and described data acquisition unit connects computing machine through data processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520236747.7U CN204555997U (en) | 2015-04-17 | 2015-04-17 | A kind of positioning optical fiber grating sensing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520236747.7U CN204555997U (en) | 2015-04-17 | 2015-04-17 | A kind of positioning optical fiber grating sensing device |
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| Publication Number | Publication Date |
|---|---|
| CN204555997U true CN204555997U (en) | 2015-08-12 |
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| CN201520236747.7U Expired - Fee Related CN204555997U (en) | 2015-04-17 | 2015-04-17 | A kind of positioning optical fiber grating sensing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748772A (en) * | 2015-04-17 | 2015-07-01 | 安徽师范大学 | Positioning fiber grating sensor |
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2015
- 2015-04-17 CN CN201520236747.7U patent/CN204555997U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748772A (en) * | 2015-04-17 | 2015-07-01 | 安徽师范大学 | Positioning fiber grating sensor |
| CN104748772B (en) * | 2015-04-17 | 2017-06-27 | 安徽师范大学 | Positioning optical fiber grating sensing device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150812 Termination date: 20170417 |