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
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