Self-mixing laser Doppler vibrometry with high optical sensitivity: application to real-time sound reproduction

Details Self-mixing laser Doppler vibrometry with high optical sensitivity: application to real-time sound reproduction Self-mixing laser Doppler vibrometry with high optical sensitivity: application to real-time sound reproduction

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003njph....5....8a&link_type=abstract

New Journal of Physics, Volume 5, Issue 1, pp. 8 (2003).

Physics

5

Scientific paper

Nanometre vibration measurement of an audio speaker and a highly sensitive sound reproduction experiment have been successfully demonstrated by a self-aligned optical feedback vibrometry technique using the self-mixing modulation effect in a laser-diode-pumped microchip solid-state laser. By applying nanometre vibrations to the speaker, which produced nearly inaudible music below 20 dB (200 µPa) sound pressure level, we could reproduce clear sound in real time by the use of a simple frequency modulated wave demodulation circuit with a -120 dB light-intensity feedback ratio.

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