CN102998039A - Simultaneous stress and distortion measurement sensor based on polarization maintaining fiber of fiber loop mirror - Google Patents
Simultaneous stress and distortion measurement sensor based on polarization maintaining fiber of fiber loop mirror Download PDFInfo
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- CN102998039A CN102998039A CN201110278063XA CN201110278063A CN102998039A CN 102998039 A CN102998039 A CN 102998039A CN 201110278063X A CN201110278063X A CN 201110278063XA CN 201110278063 A CN201110278063 A CN 201110278063A CN 102998039 A CN102998039 A CN 102998039A
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Abstract
The invention belongs to the technical field of fiber sensing and relates to a simultaneous stress and distortion measurement sensor based on a polarization maintaining fiber of a fiber loop mirror. The sensor is characterized by comprising an optical coupler (1), an optical polarization controller (2), the polarization maintaining fiber (3), a spectrum analyzer (4) and a light source (5). Temperature can be measured by observing amplitude of the edge of a spectrum, and distortion is measured by observing movement of the spectrum. In addition, the sensor has the advantages of high sensitivity, simple structure and the like.
Description
Technical field
The invention provides a kind of polarization maintaining optical fibre based on fiber loop mirror stress, twist simultaneously-measured sensor, belong to technical field of optical fiber sensing.
Background technology
Based on simple in structure, anti-electromagnetic interference (EMI), be applicable to reach at a distance the plurality of advantages such as distributed sensing, Fibre Optical Sensor has been obtained in Practical Project and has been used widely and research.People are to the suspension type temperature based on the employing fiber loop mirror before, pressure, the sensor of the aspects such as stress has carried out a large amount of applied research fiber loop mirrors and has comprised one group of high birefringence optical fiber, it has the independence of input polarization and consists of the periodicity of spectrum filter, and it only relies on the length of high birefringence optical fiber but not the overall length of fiber loop mirror.In optical sensor, High-Birefringence Fiber Loop Mirror is used for pressure, temperature, and liquid level position and displacement measurement are equally also as the spectrum filter of Bragg grating detuner.And, but High-Birefringence Fiber Loop Mirror and Bragg grating or long-period gratings form the synchro measure temperature, and the device of pressure has carried out experimental study, adopts polarization maintaining optical fibre can realize that as the fiber loop mirror system of sensing head many kinds of parameters measures simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of polarization maintaining optical fibre based on fiber loop mirror stress, twist simultaneously-measured sensor.The stress that this device can be suffered with object to be measured and the variable quantity that is distorted are converted into amplitude variations or the drift value of detectable signal, have the characteristics such as simple in structure, easy operating, sensitivity height.
The present invention is achieved through the following technical solutions:
Based on the stress of the polarization maintaining optical fibre of fiber loop mirror, twist simultaneously-measured sensor, it is characterized in that: formed by photo-coupler (1), optical polarization controller (2), polarization maintaining optical fibre (3) and spectroanalysis instrument (4) and light source (5); Light source (5) connects the input port of photo-coupler (1) by single-mode fiber, two coupling arms of photo-coupler (1) connect respectively optical polarization controller (2) and polarization maintaining optical fibre (3), and total output port that spectroanalysis instrument (4) connects photo-coupler (1) links to each other.
The stress of described polarization maintaining optical fibre based on fiber loop mirror, twist simultaneously-measured sensor, it is characterized in that: photo-coupler (1) is 2 * 2 type photo-couplers.
The stress of described polarization maintaining optical fibre based on fiber loop mirror, twist simultaneously-measured sensor, it is characterized in that: the distance between the center, polarization maintaining optical fibre (3) two stressed zone is 5-10 μ m, and the length of polarization maintaining optical fibre (3) is 0.1-0.5m.
The temperature of described suspension type twin-core fiber based on adopting fiber loop mirror, pressure phase be torsion torque sensor independently, and it is characterized in that: the centre wavelength of light source (5) is 1550nm, and its width of light source scope is 100-200nm.
Principle of work of the present invention is: the polarization maintaining optical fibre of the fiber loop mirror of this sensor is the high polarization maintaining optical fibre of high index-contrast, the reason of its high index-contrast is that the asymmetric difference of the stress of twin-core structure causes the refractive index of two cores to differ greatly, the two-way light of in this fiber loop mirror, propagating, the wavelength difference during stack is:
Δλ＝λ
2/ΔnL
Provide, wherein
Be the specific refractivity of two cores, L is fiber lengths.
For the measurement of distortion, associated according to not being both of the polarization degree of photoconduction in frequency spectrum edge amplitude result's difference and the core, application fast Fourier transform technology and method for visualizing can be realized; For the measurement of stress, observe without the frequency spectrum under pressure and the certain pressure, can find that two spectral lines have a significantly skew, thereby realize corresponding force measurement by measuring its side-play amount.
The invention has the beneficial effects as follows: utilize the asymmetric polarization maintaining optical fibre of the stress of twin-core structure in the fiber loop mirror can realize independent sensing between stress and distortion.
Description of drawings
Fig. 1 is based on stress, the simultaneously-measured sensor synoptic diagram of distortion of the polarization maintaining optical fibre of fiber loop mirror
Fig. 2 is distortion measurement figure
Fig. 3 is at spectrum curve and fast Fourier analysis method curve map unstressed and sensor when stress is arranged
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment:
Referring to accompanying drawing 1, a kind of stress of the polarization maintaining optical fibre based on fiber loop mirror, twist simultaneously-measured sensor, it is characterized by: formed by photo-coupler (1), optical polarization controller (2), polarization maintaining optical fibre (3) and spectroanalysis instrument (4) and light source (5); Light source (5) connects the input port of photo-coupler (1) by single-mode fiber, two coupling arms of photo-coupler (1) connect respectively optical polarization controller (2) and polarization maintaining optical fibre (3), and total output port that spectroanalysis instrument (4) connects photo-coupler (1) links to each other.Because the high birefringence effect that the asymmetric stress area of polarization maintaining optical fibre is realized, when measuring corresponding amount stress and distortion, the variation by observing frequency spectrum and variable quantity can be realized the measurement to them.
The refringence of two polarization stressed zones of the polarization maintaining optical fibre that adopts among the present invention is 10
-3, the core diameter of polarization maintaining optical fibre is 1.5 μ m, and cladding diameter is 124 μ m, and the distance between the two fibre core stressed zones is 7 μ m, and propagation loss is 0.3dB/m.Photo-coupler is 2 * 2 types, and insertion loss is 3dB, changes by the spectral line of observing spectroanalysis instrument, as shown in Figure 2, can measure the suffered distortion of this polarization maintaining optical fibre, and the visualization technique of using the fast Fourier analysis method realizes corresponding force measurement, as shown in Figure 3.
Claims (4)
- Based on the stress of the polarization maintaining optical fibre of fiber loop mirror, twist simultaneously-measured sensor, it is characterized in that: formed by photo-coupler (1), optical polarization controller (2), polarization maintaining optical fibre (3) and spectroanalysis instrument (4) and light source (5); Light source (5) connects the input port of photo-coupler (1) by single-mode fiber, two coupling arms of photo-coupler (1) connect respectively optical polarization controller (2) and polarization maintaining optical fibre (3), and spectroanalysis instrument (4) connects total output port of photo-coupler (1).
- The stress of the polarization maintaining optical fibre based on fiber loop mirror according to claim 1, twist simultaneously-measured sensor, it is characterized in that: photo-coupler (1) is 2 * 2 type photo-couplers.
- The stress of the polarization maintaining optical fibre based on fiber loop mirror according to claim 1, twist simultaneously-measured sensor, it is characterized in that: the distance between the center, polarization maintaining optical fibre (3) two stressed zone is 5-10 μ m, and the length of polarization maintaining optical fibre (3) is 0.1-0.5m.
- 4. the temperature of the suspension type twin-core fiber based on adopting fiber loop mirror according to claim 1, pressure torsion torque sensor independently mutually, it is characterized in that: the centre wavelength of light source (5) is 1550nm, its width of light source scope is 100-200nm.
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| CN201110278063XA CN102998039A (en) | 2011-09-19 | 2011-09-19 | Simultaneous stress and distortion measurement sensor based on polarization maintaining fiber of fiber loop mirror |
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| CN201110278063XA CN102998039A (en) | 2011-09-19 | 2011-09-19 | Simultaneous stress and distortion measurement sensor based on polarization maintaining fiber of fiber loop mirror |
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| CN103727900A (en) * | 2014-01-07 | 2014-04-16 | 中国计量学院 | Polarimetry-based embedded fiber distortion sensor |
| CN103808341A (en) * | 2014-01-26 | 2014-05-21 | 沈阳师范大学 | Distributed microstructure optical fiber sensor |
| CN105841724A (en) * | 2016-03-24 | 2016-08-10 | 北京理工大学 | Interference type optical fiber sensor for simultaneously measuring pressure and temperature |
| WO2020184396A1 (en) * | 2019-03-12 | 2020-09-17 | 古河電気工業株式会社 | Pressure sensor |
| CN112432724A (en) * | 2020-12-01 | 2021-03-02 | 东北林业大学 | Stress sensor based on vernier effect of optical fiber resonant cavity and stress measurement method |
| JP2022044741A (en) * | 2019-03-12 | 2022-03-17 | 古河電気工業株式会社 | Pressure sensor |
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| JP2020148525A (en) * | 2019-03-12 | 2020-09-17 | 古河電気工業株式会社 | Pressure sensor |
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| CN112432724A (en) * | 2020-12-01 | 2021-03-02 | 东北林业大学 | Stress sensor based on vernier effect of optical fiber resonant cavity and stress measurement method |
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Application publication date: 20130327 |