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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 11,
  • Issue 2,
  • pp. 021201-
  • (2013)

Infrasound detection by laser diode self-mixing interferometry

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Abstract

An alternative technique for infrasound detection based on the self-mixing (SM) interference of a laser diode is described. The principle involved is the dependence of the power emitted by the laser diode on infrasound-induced membrane vibration. The Fourier transform and fringe-counting methods are used to analyze the self-mixing signal. Infrasound signals are experimentally measured from 2 to 20 Hz with a resolution of 0.25, and the results well agree with the theoretical ones.

© 2013 Chinese Optics Letters

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