We describe an interferometric heterodyne vibrometer that uses a laser diode with a triangular modulation frequency. This optical sensor is used to probe a vibrating polished surface. As an illustration of the sensor performance, the control of nonuniform velocity of a linear motor is achieved. The technique can be used over a large bandwidth between a few hertz and several tens of kilohertz. Generalization of the technique to the sensing of frequency vibrations is also demonstrated theoretically.
© 2001 Optical Society of America
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(140.2020) Lasers and laser optics : Diode lasers
(280.3340) Remote sensing and sensors : Laser Doppler velocimetry
Ahmed Chebbour, Tijani Gharbi, and Gilbert Tribillon, "Laser-Diode Interferometric Heterodyne Vibrometer: Application to Linear Motor Control," Appl. Opt. 40, 5610-5614 (2001)