CN104359598B - A kind of pressure transducer based on fiber grating and application thereof - Google Patents
A kind of pressure transducer based on fiber grating and application thereof Download PDFInfo
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- CN104359598B CN104359598B CN201410533409.XA CN201410533409A CN104359598B CN 104359598 B CN104359598 B CN 104359598B CN 201410533409 A CN201410533409 A CN 201410533409A CN 104359598 B CN104359598 B CN 104359598B
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Abstract
A kind of pressure transducer based on fiber grating and application thereof, belong to technical field of optical fiber sensing, supports optical fiber and has the optical fiber of FBG FP structure and be clamped in abreast between two metallic plates；Two metallic plates completely covers the Fabry-Perot structure section as reflecting surface of two fiber gratings in the optical fiber with FBG FP structure, and the two ends of the optical fiber with FBG FP structure are separately positioned on outside two metallic plates；The face that two metallic plates are relative is respectively smooth plane.The present invention is to have the optical fiber of FBG FP structure as measuring cell, the pressure being applied to outside metallic plate is delivered to measure on optical fiber by metallic plate, and the two ends of the optical fiber with FBG FP structure outside two metallic plates can be as the signal connection end mouth of corresponding detecting instrument.It is used for pressure above sensor measuring, it is convenient to measure respectively and produce dual-wavelength laser and microwave signal for resonant cavity laser instrument accurately.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, be specifically related to the structure technology of pressure transducer based on fiber grating.
Background technology
The one that optical fiber sensing technology is accompanied by the development of Fibre Optical Communication Technology and develops rapidly is with light as carrier, and optical fiber is medium, perception and the New Sensing Technology of transmission outer signals (to be measured).When this outer signals is pressure, i.e. constitute fibre optic compression sensor.Compared to traditional pickoff, Fibre Optical Sensor has explosion-proof, the electromagnetism interference of essence, stable performance, the advantage such as corrosion-resistant, lightweight, it is adaptable to adverse circumstances use.
Fiber Bragg Grating FBG (FBG), as a kind of novel fiber optic passive device, has broad application prospects at sensory field of optic fibre.In addition to having the advantage of ordinary optic fibre sensor, FBG can also realize the advantages such as multipoint multiplexing, distributed measurement, self-reference, therefore, has been widely used for multiple fields such as petrochemical industry, medical science, nuclear industry, civil engineering, Aero-Space.
At present; FBG Pressure sensing solutions is typically based on following principle: the birefringence that pressure introduces causes FBG reflection peak division (divide two peaks and belong to different polarization mould) in ordinary optic fibre; or the polarization mode spectrum interval of reflectance spectrum changes in polarization maintaining optical fibre; by measuring two polarization mode reflection peak spectrum intervals, obtain pressure size.
But, the bandwidth of FBG is the widest compared with the spectrum interval of the reflection peak that minimal stress introduces, and brings certain obstacle to pressure sensing high resolution measurement.The scheme realizing high-resolution sensing having pointed out at present mainly have based on π phase-shifted grating, long-period gratings and can inverse sampling grating this is several, but π phase-shifted grating and can inverse sampling grating processing on complex relative to common grating, make troubles to the large-scale application of this sensor, long-period gratings is more sensitive to temperature, exists than more serious cross-interference issue.
Summary of the invention
In view of the drawbacks described above of prior art, the present invention proposes to overcome the sensor of a kind of Fabry-Perot-type cavity (FBG-FP) constituted based on common FBG of disadvantages described above.
The present invention by two metallic plates, one support optical fiber and an optical fiber with FBG-FP structure and form, described support optical fiber and there is the optical fiber of FBG-FP structure be clamped in abreast between two metallic plates；The optical fiber of the described FBG-FP of having structure sets, in being, the single-mode fiber including two identical fiber gratings, said two metallic plate completely covers the Fabry-Perot structure section as reflecting surface of two fiber gratings in the optical fiber with FBG-FP structure, and the two ends of the optical fiber with FBG-FP structure are separately positioned on outside two metallic plates；The face that two metallic plates are relative is respectively smooth plane.
The present invention is to have the optical fiber of FBG-FP structure as measuring cell, the pressure being applied to outside metallic plate is delivered to measure on optical fiber by metallic plate, and the two ends of the optical fiber with FBG-FP structure outside two metallic plates can be as the signal connection end mouth of corresponding detecting instrument.The present invention is in addition to realizing high-resolution sensing, and the program also has the advantage that temperature-insensitive, sensitivity and dynamic range are optional, be prone to processing.
Compared with prior art, the present invention has a following useful technique effect:
1. high-resolution: incident illumination by two ends FBG reflect after at Fabry-Perot intracavity generation multiple-beam interference, produce multiple bandwidth much smaller than the transmission peaks resonance peak of FBG reflection bandwidth, thus it is excessive and can not realize the problem that minimal stress distinguishes to solve single FBG reflection bandwidth.
2. temperature-insensitive: having identical temperature-responsive owing to belonging to two transmission peaks of different polarization mould, its wavelength interval will not be affected by temperature, so that the advantage that the temperature sensor of the present invention has temperature-insensitive.
3. sensitivity and dynamic range are optional: surveyed wavelength interval can be different because optical fiber placed angle is different to pressure sensitivity, therefore can realize different sensitivity and dynamic range by change optical fiber placed angle according to demand.
4. it is prone to processing: Fabry Perot reflection cavity is to be made up of two common FBG, compared with common FBG sensing solutions, will not bring additional processing difficulty.
The present invention also proposes to be used for pressure above sensor the application measured:
The two ends in pressure transducer with the optical fiber of FBG-FP structure are connected to two inputs of circulator, the outfan of circulator connects one end of Polarization Controller, the other end of Polarization Controller is connected to one end of fiber grating by gain fiber mixed with Er and Yb in fibre core, the other end of fiber grating is connected with the input of bonder by wavelength division multiplexer, one outfan of bonder connects spectro-metre, and another outfan of bonder is connected with electricity frequency spectrum view by photodetector.
Connected by above, it is convenient to measure respectively and produce dual-wavelength laser and microwave signal for resonant cavity laser instrument accurately.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation for present invention pressure transducer based on fiber grating.
Fig. 2 is the left side schematic view of Fig. 1.
Fig. 3 is that the pressure of the present invention passes device device transmission spectrum under with or without transverse pressure.
Fig. 4 is with transverse pressure as independent variable, and pressure passes the wavelength spike response relation figure of FBG-FP transmission in device.
Fig. 5 is under different optical fiber placed angle, and with horizontal force as independent variable, pressure passes the response relation figure of FBG-FP in device.
Fig. 6 is pressure to pass device device be used for resonant cavity laser instrument to produce the connection diagram of dual-wavelength laser and microwave signal.
Fig. 7 is dual laser laser output spectrum measurement figure.
Fig. 8 is the electric spectrum measurement figure of beat frequency produced by dual laser.
Fig. 9 is the variation relation figure of dual laser beat frequency and transverse pressure.
Detailed description of the invention
One, the architectural feature of pressure transducer of the present invention:
As it is shown in figure 1, pressure transducer is supported optical fiber 2 by two metallic plates 1, one and an optical fiber 3 with FBG-FP structure forms.Support optical fiber 2 and there is the optical fiber 3 of FBG-FP structure be clamped in abreast between two metallic plates 1；The face that two metallic plates 1 are relative is respectively smooth plane.
As shown in Figure 2, have in the optical fiber 3 of FBG-FP structure is and set the single-mode fiber including two identical fiber gratings 31, two metallic plates 1 completely covers two in the optical fiber 3 with FBG-FP structure using fiber grating 31 as the Fabry-Perot structure section of reflecting surface, and the two ends 32 and 33 of the optical fiber 3 with FBG-FP structure are separately positioned on the outside of two metallic plates 1.
Two, the characteristic of pressure transducer:
1, the transmission of the pressure biography device device that Fig. 3 respectively illustrates the present invention is composed.Wherein curve 1 is to have the transmission spectrum under transverse pressure, and curve 2 is the transmission spectrum under no pressure.
From Fig. 3 clearly visible: transmission spectrum in multiple sharp-pointed transmission peaks occurs, and the transmission spectrum spike quantity under having transverse pressure effect is the twice in the case of no pressure, this is the birefringence introduced in a fiber due to transverse pressure, and each transmission peak is split into a pair.
2, it is with transverse pressure as independent variable, pressure passes the wavelength spike response relation figure of FBG-FP transmission in device, as shown in Figure 4: when the pressure was increased, spike 2 approximately linearly drifts about to long wavelength direction, and spike 1 is kept approximately constant, thus causing when the pressure was increased, wavelength interval linearly changes.Additionally the wavelength of spike 1 is slightly larger than the original transmitted spike corresponding wavelength under pressure-less state.
Fig. 5 shows under different angles, and with horizontal force as independent variable, pressure passes the response relation of FBG-FP in device.In Fig. 5, curve 1,2,3,4 represents amount on the downside of optical fiber placed angle rotation 0 °, 90 °, 180 ° and 270 ° of conditions respectively, and pressure sensitivity is 48.9,44.6,74.1 and 91.8 pm/ (N mm respectively-1)。
Visible, the pressure sensitivity under different fiber angle is significantly different.By selecting the different placed angles of optical fiber, different sensitivitys and measurement dynamic range can be realized with a FBG-FP.
Three, application:
Utilizing the beat frequency of light, pressure passes device can be applied to resonant cavity laser instrument to produce dual-wavelength laser and microwave signal, and for pressure sensing.
As shown in Figure 6, the two ends in pressure transducer 1 with the optical fiber of FBG-FP structure are connected to two inputs of circulator 2, the outfan of circulator 2 connects one end of Polarization Controller 3, the other end of Polarization Controller 3 connects the gain fibre 4 of one section of Er and Yb codope, then the 3db apodization fiber grating 5 with a width of 0.19nm is connected, the other end of fiber grating 5 is connected with the input of the bonder 7 of 10:90 by wavelength division multiplexer 6, one outfan of bonder 7 connects spectro-metre 8, another outfan of bonder is connected with electricity frequency spectrum view 10 by photodetector 9.
Apodization FBG is installed on fiber stretcher and regulates centre wavelength such that it is able to optionally the specific transmission peak with pressurized FBG-FP matches.Laser instrument is by a 980/1550 wavelength division multiplexer pumping, and wavelength division multiplexer is fused at one section of resonator cavity thus reduces cavity length.Laser output is launched in a 10:90 bonder 7.The laser output of 10% is monitored by spectrogrph 8, and the output light of 90% enters photo-detector 9, and beat signal is observed by electricity audiofrequency spectrometer 10.
Fig. 7 shows when transverse pressure is 1.34N/mm, the outgoing spectrum of laser instrument, it can be observed that belong to two output peaks of different polarization states.
Fig. 8 shows the electric frequency spectrum in this case recorded, and has a peak value, the beat frequency of corresponding laser instrument.
Fig. 9 show dual laser beat frequency with transverse pressure variation tendency, linear, relevant pressure sensitivity is 5.95GHz/N/mm.
Claims (1)
1. the application of pressure transducer based on fiber grating, described pressure transducer based on fiber grating by two metallic plates, one support optical fiber and an optical fiber with FBG-FP structure and form, described support optical fiber and there is the optical fiber of FBG-FP structure be clamped in abreast between two metallic plates；The optical fiber of the described FBG-FP of having structure sets, in being, the single-mode fiber including two identical fiber gratings, said two metallic plate completely covers the Fabry-Perot structure section as reflecting surface of two fiber gratings in the optical fiber with FBG-FP structure, and the two ends of the optical fiber with FBG-FP structure are separately positioned on outside two metallic plates；The face that two metallic plates are relative is respectively smooth plane；It is characterized in that: the two ends in pressure transducer with the optical fiber of FBG-FP structure are connected to two inputs of circulator, the outfan of circulator connects one end of Polarization Controller, the other end of Polarization Controller is connected to one end of fiber grating by gain fiber mixed with Er and Yb in fibre core, the other end of fiber grating is connected with the input of bonder by wavelength division multiplexer, one outfan of bonder connects spectro-metre, and another outfan of bonder is connected with electricity frequency spectrum view by photodetector.
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| CN106679860A (en) * | 2017-03-16 | 2017-05-17 | 中国计量大学 | Transverse pressure sensors based on TFBG |
| US10768061B2 (en) * | 2017-06-27 | 2020-09-08 | Fibos Inc. | Optical sensor having π-phase shifted Bragg grating and optical sensing system using same |
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Effective date of registration: 20190401 Address after: 225108 Xibei Road, Touqiao Town, Guangling District, Yangzhou City, Jiangsu Province Patentee after: Jiangsu Xibei Electronics Networkstallation Co., Ltd. Address before: 225000 Xibei Avenue, Touqiao Town, Guangling District, Yangzhou City, Jiangsu Province Patentee before: YANGZHOU RUNTE OPTOELECTRONIC TECHNOLOGY CO., LTD. |