Remote ultrasensitive laser microphone

G. Sánchez Guerrero; C. Guajardo Gonzáles; P. Viera González; R. Selvas; L. Ramos Traslosheros

doi:10.1117/12.894499

16 September 2011 Remote ultrasensitive laser microphone

G. Sánchez Guerrero, C. Guajardo Gonzáles, P. Viera González, R. Selvas, L. Ramos Traslosheros

Proceedings Volume 8133, Dimensional Optical Metrology and Inspection for Practical Applications; 81330Y (2011) https://doi.org/10.1117/12.894499
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

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.

Citation Download Citation

G. Sánchez Guerrero, C. Guajardo Gonzáles, P. Viera González, R. Selvas, and L. Ramos Traslosheros "Remote ultrasensitive laser microphone", Proc. SPIE 8133, Dimensional Optical Metrology and Inspection for Practical Applications, 81330Y (16 September 2011); https://doi.org/10.1117/12.894499

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