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A piece-wise transition detection algorithm that performs displacement measurements for self-mixing sen- sors is developed. The algorithm can correctly detect self-mixing fringes at a low signal-to-noise ratio in the presence of disturbances without filtering. Displacement reconstructions by the phase unwrapping method based on this algorithm are experimentally validated, with laser subject to the moderate feedback regime. 相似文献
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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. 相似文献
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A compact multipass cell with low fringes and high thermal stability is described.This cell is formed by two twisted cylindrical mirrors.The optical parameters are determined based on the selection criteria,which include mirror filling efficiency,interference fringes,and pattern stability.With a pattern of 174 passes,this cell gives a 22-m path length in a volume of 0.55 L.The results of an absorption measurement of oxygen at 13 091.7 cm 1show that the fringe noise is lower than 6.54×10 4.The maximum allowed temperature change to keep the beam from exiting is 33 K,which indicates high stability against thermal drift. 相似文献
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