16 September 2011 Remote ultrasensitive laser microphone
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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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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