Unbalanced optical fiber Michelson interferometer arm length adjusting device
A technology of adjusting device and measuring arm length, which is applied in the field of unbalanced fiber Michelson interferometer arm length adjusting device, and can solve the problem that it is difficult to meet the requirements of high precision, fast phase demodulation, slow response speed of motor drive, and manufacturing of optical fiber interferometric sensors. Complex process and other problems, to achieve the effect of low production cost, good adaptability and high adjustment accuracy
Active Publication Date: 2017-07-14
CHINA THREE GORGES UNIV
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Problems solved by technology
However, this solution needs to design a precise mechanical structure to ensure accuracy, the manufacturing process is complicated, the cost is high, and the response speed of the motor drive is slow and the real-time performance is poor. It is difficult to meet the needs of high-precision and fast phase demodulation of optical fiber interferometric sensors. Therefore, How to simplify the structure of the arm length adjustment device of the unbalanced fiber optic Michelson interferometer and optimize the real-time and flexibility of the adjustment device is an urgent issue in the field of fiber optic interferometric sensors.
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[0023] Such as figure 1 , figure 2 As shown, an unbalanced Michelson interferometer arm length adjustment device, the structure is as follows figure 1 As shown, it consists of a micrometer cylinder 1, an optical coupler 2, a Faraday magnetic ring 3, a piezoelectric ceramic ring 4, a micrometer vernier 5, a first collimator 6, a second collimator 7, and a voltage control line 8. The micrometer barrel 1 is the supporting structure of the adjusting device, and is threadedly connected with the micrometer vernier 5 . The optical coupler 2 is used to split the incident laser signal, and at the same time couple the reflected light from the two arms, and interfere in the coupling area. The Faraday magnetic ring 3 is used to compensate the polarization fading in the optical fiber line, one end is connected to the piezoelectric ceramic ring 4, and the other end can move freely, under the action of the piezoelectric ceramic ring 4, the arm difference of the Michelson interferometer is...
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Abstract
The invention relates to an unbalanced optical fiber Michelson interferometer arm length adjusting device, which comprises a micrometer cylinder, an optical coupler, a Faraday magnetic ring, a piezoelectric ceramic ring, a micrometer vernier, a first collimator and a second collimator. According to the invention, the Faraday magnetic ring is designed to be a one-dimensional free structure, a micrometer is rotated to change the position of a free arm, arm difference adjustment is performed within a um-cm level range, nm-um level precision adjustment is performed on the Faraday magnetic ring by combining electrically-controlled piezoelectric ceramic, and the arm length difference of the Michelson interferometer is flexibly changed. The adjusting device has the advantages of large measuring range, high adjustment precision, high response speed, simple structure and the like, and has good application prospects.
Description
technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an arm length adjustment device of an unbalanced optical fiber Michelson interferometer. Background technique [0002] In fiber optic interferometric sensors such as fiber optic hydrophones, accelerometers, and vibration sensors, it is necessary to detect the phase change of the sensing signal to obtain the measured physical quantity. The two interference optical paths must be matched quickly and accurately, and real-time compensation due to noise The zero point offset caused by this makes the sensor at the best working point, so as to obtain the highest sensitivity. Usually, an unbalanced Michelson interferometer is introduced into the demodulation optical path for phase adjustment and matching. At present, most methods of phase adjustment are to insert a fiber delay line into a single arm of an unbalanced Michelson interferometer, and achieve phase matching by changing the...
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IPC IPC(8): G02B7/00G02F1/09G01J9/02
CPCG02B7/00G02F1/09G01J9/02
Inventor 罗志会陈思王凤钧陈小刚潘礼庆肖焱山
Owner CHINA THREE GORGES UNIV