Based on optical fiber Michelson interferometer for acoustic emission detection experimental research

Yijun Liang; Dandan Qu; Hu Deng

doi:10.1117/12.2034483

29 August 2013 Based on optical fiber Michelson interferometer for acoustic emission detection experimental research

Yijun Liang, Dandan Qu, Hu Deng

Proceedings Volume 8914, International Symposium on Photoelectronic Detection and Imaging 2013: Fiber Optic Sensors and Optical Coherence Tomography; 89140Z (2013) https://doi.org/10.1117/12.2034483
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

A type of Michelson interferometer with two optical fiber loop reflectors acoustic emission sensor is proposed in the article to detect the vibrations produced by ultrasonic waves propagating in a solid body. Two optical fiber loop reflectors are equivalent to the sensing arm and the reference arm instead of traditional Michelson interferometer end reflecter Theoretical analyses indicate that the sensitivity of the system has been remarkably increased because of the decrease of the losses of light energy. The best operating point of optical fiber sensor is fixed by theoretical derivation and simulation of computer, and the signal frequency which is detected by the sensor is the frequency of input signal. PZT (Piezoelectric Ceramic) is powered by signal generator as known ultrasonic source, The Polarization controller is used to make the reflected light interference，The fiber length is changed by adjusting the DC voltage on the PZT with the fiber loop to make the sensor system response that ΔΦ is closed to π/2. the signal basis frequency detected by the sensor is the frequency of the input signal. Then impacts the surface of the marble slab with home-made mechanical acoustic emission source. And detect it. and then the frequency characteristic of acoustic emission signal is obtained by Fourier technique. The experimental results indicate that the system can identify the frequency characteristic of acoustic emission signal, and it can be also used to detect the surface feeble vibration which is generated by ultrasonic waves propagating in material structure.

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Yijun Liang, Dandan Qu, and Hu Deng "Based on optical fiber Michelson interferometer for acoustic emission detection experimental research", Proc. SPIE 8914, International Symposium on Photoelectronic Detection and Imaging 2013: Fiber Optic Sensors and Optical Coherence Tomography, 89140Z (29 August 2013); https://doi.org/10.1117/12.2034483

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KEYWORDS

Acoustic emission

Sensors

Signal detection

Ultrasonics

Michelson interferometers

Optical fibers

Ferroelectric materials

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