16 September 2011 Remote ultrasensitive laser microphone
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Abstract
This paper presents an optical fiber Mach-Zehnder interferometer configured as an ultra-sensitive sound detector. We used a 633nm, 0.5 mW, He-Ne laser, two 3dB couplers, a few meter of telecomm fiber, an U-bench mount to increase the sensitivity of the device and an acquisition system composed by a photodiode and an amplifier connected to a laptop and to an oscilloscope. The optoelectronic device enables us to record acoustic signals from sources at distances longer than 4 meters, converting the interference patterns induced by the sound waves into a digital signal. The ease of its applicability, thanks to its small size and low weight, and its ultra-sensitivity makes this laser microphone a very attractive solution to issues such as monitoring, no-detectable sensing and perimeter protection.
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G. Sánchez Guerrero, G. Sánchez Guerrero, C. Guajardo Gonzáles, C. Guajardo Gonzáles, P. Viera González, P. Viera González, R. Selvas, R. Selvas, L. Ramos Traslosheros, L. Ramos Traslosheros, } "Remote ultrasensitive laser microphone", Proc. SPIE 8133, Dimensional Optical Metrology and Inspection for Practical Applications, 81330Y (16 September 2011); doi: 10.1117/12.894499; https://doi.org/10.1117/12.894499
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