Infrasound detection by laser diode self-mixing interferometry

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（2）
• 页码范围: 46-50
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201311.021201

摘要

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 annayze 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.