Laser diode backscatter modulation for machine vision

Peter J. de Groot; Gregg M. Gallatin

doi:10.1117/12.35028

1 October 1990 Laser diode backscatter modulation for machine vision

Peter J. de Groot, Gregg M. Gallatin

Proceedings Volume 1375, ICALEO '89: Optical Sensing and Measurement; (1990) https://doi.org/10.1117/12.35028
Event: ICALEO89, 1989, Orlando, FL, United States

Abstract

Weak optical feedback from diffusely-reflecting targets modulates the power and emission spectrum of laser diodes. The modulation is a coherent phenomenon independent of background light and requiring very little power. The practical applications of the backscatter modulation of laser diodes is considered in the context of machine vision. It is shown that interferometry, velocimetry, absolute ranging, and position sensing can be performed with a minimum of hardware. Both high precision (submicron) and long range (50 m) systems are described.

Citation Download Citation

Peter J. de Groot and Gregg M. Gallatin "Laser diode backscatter modulation for machine vision", Proc. SPIE 1375, ICALEO '89: Optical Sensing and Measurement, (1 October 1990); https://doi.org/10.1117/12.35028

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