| Institute of Geomechanics, Chinese Academy of Geological Sciences | Host |
| Citation: |
PENG Hua, MA Xiu-min, WANG Zhen, CUI Liu-zhu, JIANG Yi. A FIBRE OPTIC EXTRINSIC FABRY-PEROT INTERFEROMETER WITH TEMPERATURE COMPENSATION FOR FAULT MEASUREMENT[J]. Journal of Geomechanics, 2013, 19(3): 315-324.
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A FIBRE OPTIC EXTRINSIC FABRY-PEROT INTERFEROMETER WITH TEMPERATURE COMPENSATION FOR FAULT MEASUREMENT
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Abstract
Fibre optic EFPI sensor is usually very small in size while the fault size is relatively big, so it is not suitable to be installed at the fault for the fibre optic EFPI. As a result, fibre optic extrinsic Fabry-Perot interferometer for fault measurement, EFPI was present. EFPI structure is formed as two ceramic ferrule inserted into the ceramic casing from the ends. Two ceramic ferrule are respectively fixed on the two metal inner tube, which are inserted into the metal outer tube form the two ends. O-type sealing rings are put at each end of the metal outer tube, so the EFPI displacement sensor is capable of waterproof and dustproof. In order to eliminate the influence of temperature on EFPI displacement sensor, two metal tubes with different thermal expansion coefficient material are chosen for temperature compensation in the structure. In the experiment, EFPI displacement sensor with 718.39 μm of the cavity length was measured in a continuous changing temperature situation. The results shows that temperature coefficient of displacement sensor has declined by 0.14 μm/℃ to -0.04 μm/℃ after temperature compensation, and showed a compensation.
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References
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PENG Hua, MA Xiu-min, WANG Zhen, CUI Liu-zhu, JIANG Yi. A FIBRE OPTIC EXTRINSIC FABRY-PEROT INTERFEROMETER WITH TEMPERATURE COMPENSATION FOR FAULT MEASUREMENT[J]. Journal of Geomechanics, 2013, 19(3): 315-324.
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Figure 1.
Structure of the EFPI displacement sensor
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Figure 2.
Principle diagram of temperature compensation
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Figure 3.
Experiment setup, the EFPI displacement sensor and the linear stage
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Figure 4.
White-light optical spectrum of the EFPI displacement sensor obtained by WLI
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Figure 5.
Displacement measurement results of the WLI
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Figure 6.
Cavity lengths without the temperature compensation in different temperatures
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Figure 7.
The cavity length with the temperature compensation in different temperatures
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Figure 8.
Change of the cavity length with the temperature compensation, when the temperature is continuously changed