Multimode laser diode system for range measurement

Details Multimode laser diode system for range measurement Multimode laser diode system for range measurement

1990-01-30

1991-06-04

Wallace, Linda J.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 45, 356345, 372 26, G01C 308, G01B 902

Patent

active

050209019

ABSTRACT:
A laser system includes a multimode laser diode positioned at a range from a target. Backscatter from the target returns into the diode and to modify the emission. An induced modulation frequency in the emission effects oscillatory mode transitions to create an amplitude modulation in mode power for a selected mode, the mode being selected by an optical spectrum analyser or an interference filter. The diode is positioned initially for a minimum in the amplitude modulation, and readjusted by a selected increment in response to an incremental change in target position so as to reestablish the amplitude modulation to the minimum. The incremental change thereby equals the selected increment.

REFERENCES:
patent: 4927263 (1990-05-01), de Groot et al.
patent: 4928152 (1990-05-01), Gerardin
"Range Finding Using Frequency-Modulated Lase Diode", by G. Behiem and K. Fritsh, Applied Optics 25, 1439 (1986).
"Laser Diode Feedback Interferometer for Stabilization and Displacement Measurement" by T. Yoshino, M. Nara, S. Mnatzakanian, B. S. Lee, and T. C. Strand, Applied Optics 26, 892 (1987).
"Small Laser Doppler Velcimeter Based on the Self-Mixing Effect in a Diode Laser" by H. W. Jentink, F. F. M. de Mul, H. E. Susihes, J. G. Aamoudse, and J. Greve, Applied Optics 27, 379 (1988).

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