Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1996-04-05
1998-09-15
Font, Frank G.
Optics: measuring and testing
By polarized light examination
With light attenuation
356375, G01N 1114
Patent
active
058087435
ABSTRACT:
This invention provides an inexpensive, sensitive sensor to measure target position, velocity and vibration based on optical feedback-induced fluctuations in the operating frequency of a diode laser. The sensor comprises a diode laser, an optical frequency discriminator to measure the laser operating frequency, and an electronic signal analyzer to obtain the modulation frequency of the laser operating frequency. This invention further includes two calibration mechanisms for vibration amplitude measurement. In a first calibration mechanism the diode laser is mounted on a laser vibrator, which vibrates the laser relative to the target. In a second calibration mechanism a frequency modulator is coupled to the diode laser to modulate the operating frequency.
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Cornell Eric A.
Roos Peter A.
Stephens Michelle S. E.
Wieman Carl E.
Board of Regents of the University of Colorado
Font Frank G.
Smith Zandra V.
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