Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1987-09-30
1989-08-15
Tarcza, Thomas H.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 285, 342111, G01C 308, G01P 336
Patent
active
048568937
ABSTRACT:
A laser distance measuring apparatus in which source beams from two lasers are combined and focused on a target. One beam is continuous wave and one has periodic narrow pulse envelopes. After reflection the composite reflected beam is redivided in a diffraction grating and compared with two respective reference beams by means of two photodetectors. Doppler data are provided, as well as separate high resolution and low resolution range output data. Integration of the Doppler data in a computer, and combination of the three data signals there, enable an unusually complete and accurate record of the shape of the target even if the shape has many severe discontinuities, as in the case of a turbine rotor. An alternative embodiment provides for switching the pulse time of flight portion of the system to utilize various harmonics of the pulse envelope waveform. Known phase delays are switchably interposed in one channel so that relative phase readings between the reference and target pulses are performed at near-zero phase differences. Phase readings can be made accurately when the signals possess near-zero phase differences. Fixed errors can be measured and calibrated out of measurement data.
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Eaton Corporation
Grace C. H.
Tarcza Thomas H.
Wallace Linda J.
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