Length and velocity measurement apparatus

Details Length and velocity measurement apparatus Length and velocity measurement apparatus

1998-01-26

2000-10-17

Buczinsky, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 409, 356 51, 356 285, G01C 308, B01P 336

Patent

active

061339938

ABSTRACT:
A length and velocity measurement apparatus based upon an interference pattern created between the amplitude modulation component of a transmitted signal, generated by an RF/microwave modulated continuous wave (CW) laser, and the amplitude modulation component of a signal reflected back from the target. The distance between the system and the target is measured by counting the periods in the interference pattern created between the amplitude modulation component of the transmitted signal and the amplitude modulation component of the reflected signal while the modulation frequency is swept from a frequency F.sub.1 to a frequency F.sub.2. In order to provide a fine adjustment of the apparatus, the apparatus may be mounted on a movable carriage to adjust the periods in the interference pattern to an integral number. Velocity measurements are made at a single frequency based upon the Doppler effect induced by the moving target.

REFERENCES:
patent: 3094693 (1963-06-01), Taylor
patent: 3113309 (1963-12-01), Kuecken
patent: 3152326 (1964-10-01), Merlo
patent: 3730628 (1973-05-01), Wolcott et al.
patent: 4902125 (1990-02-01), Keene et al.

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