Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1984-04-13
1986-07-29
Punter, William H.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356152, 364822, G02B 133, G01C 100
Patent
active
046028528
ABSTRACT:
An acousto-optic deflector system including first and second transducers for producing acoustic waves for interaction with an optic beam in an acousto-optic device. The transducers are driven by signals of differing frequencies (f.sub.1 +.DELTA.f, f.sub.1) in order to produce two deflected optical beams from an incident optical beam launched from a laser. The two deflected beams are detected by a common photodetector whose output is filtered whereby to separate a component which is dependent on the frequency difference. The phase of this component is the relative optical phase of the two deflected optical beams. By determining the phase of the component for different frequencies (f.sub.1, F.sub.1 =f.sub.T etc.), the optical angle of incidence (.theta..sub.i) may be obtained. Alternatively, by frequency modulating both transducer drive signals and appropriately electronically processing the detector output, a signal whose amplitude varies with the optical angle of incidence can be obtained. This signal is a minimum when the optical angle of incidence is optimized. Optimization of the optical angle of incidence can be performed automatically.
REFERENCES:
patent: 3516853 (1985-05-01), Pearson
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patent: 4012120 (1977-03-01), Kagiwada et al.
patent: 4297704 (1981-10-01), Marom et al.
patent: 4421388 (1983-12-01), Berg et al.
patent: 4468084 (1984-08-01), Hutcheson et al.
Rhodes, W. T., "Acousto-Optic Signal Processing: Convolution & Correlation", Proc. IEEE, 1-1981, pp. 65-79.
Coppock et al, "Bragg Cell RF Signal Processing", Microwave Jr., 9-1978, pp. 62-65.
International Standard Electric Corporation
May J. M.
Peterson T. L.
Punter William H.
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