Laser doppler and time of flight range measurement

Details Laser doppler and time of flight range measurement Laser doppler and time of flight range measurement

1987-09-30

1989-04-04

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 285, 356141, 356152, G01C 308, G01P 336, G01B 1126

Patent

active

048181005

ABSTRACT:
A hybrid laser distance gauge utilizes complementary simultaneous measurements based upon both Doppler and time of flight principles. A complete record can be produced of the location and shape of a target object even when the object has severe discontinuities such as the edges of a turbine blade. Measurements by the two principles are made by using many optical elements in common.
The Doppler measurements have an open loop optical/electronic arrangement in which the Doppler shift is converted to a voltage by a phase locked loop. The time of flight measurements are made at one or more harmonic frequencies of a mode locked pulse envelope wave train, for unusually accurate and unambiguous distance data.

REFERENCES:
patent: 3652161 (1972-03-01), Ross
patent: 3950100 (1976-04-01), Keene et al.
patent: 4167329 (1979-09-01), Jelalian et al.
patent: 4190361 (1980-02-01), Dubrunfaut
patent: 4516853 (1985-05-01), Pearson
patent: 4572662 (1986-02-01), Silverman
patent: 4690551 (1987-09-01), Edwards et al.

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