Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1987-09-30
1989-08-29
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
342 83, 342 84, 342 99, 342132, 356 285, G01C 308
Patent
active
048611590
ABSTRACT:
An optical gauge measures the shape of a target object by scanning a laser beam over it, (and/or measures the radial velocity of the target), by measuring the Doppler frequency shift of the reflected wave. The Doppler-shifted frequency is demodulated by a phase locked loop, which has a limited hold-in frequency range within which it is capable of staying locked on. With this invention, if the reflected wave's frequency gets close to exceeding the hold-in range of the phase locked loop, the gauge adjusts the drive frequency of an acoustooptical modulator that modulates the outbound target beam. This offsets the frequency of the target beam and keeps the return signal within the hold-in range of the phase locked loop.
REFERENCES:
patent: 4716444 (1987-12-01), Mongeon et al.
patent: 4743110 (1988-05-01), Arnaud et al.
Buczinski Stephen C.
Eaton Corporation
Grace C. H.
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