Patent ID: 9658113
Date: 2017-05-23
CPC Classifications: G01B,G01J

Claim:
1. An optical device, based on the self-mixing effect, for determining a physical parameter, including: a laser light source for generating a light beam, called the emitted beam, in the direction of a target; a means for detecting an interferometric signal SM(t), said interferometric signal including interference fringes and information on the physical parameter to be determined, and being generated by interference between the emitted beam and a light beam reflected by the target; and means for converting the interferometric signal SM(t) obtained by the detecting means into a measurement of the physical parameter; wherein said converting means include: first means for removing a continuous component Off(t) from the interferometric signal SM(t), said first means being configured to remove the continuous component locally for each of the interference fringes of the interferometric signal; and second means for determining interferometric peaks of the interferometric signal SM(t), said peaks being obtained from the signal obtained as output from the first means, the second means including a Hilbert filter.