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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