Device for measuring an angular deviation by heterodyne detectio

Details Device for measuring an angular deviation by heterodyne detectio Device for measuring an angular deviation by heterodyne detectio

1974-03-28

1976-02-17

Stolwein, Walter

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250578, 356152, G01J 120

Patent

active

039393429

ABSTRACT:
A device for measuring an angular deviation by a space-time modulated heterodyne detection comprising a coherent optical radiation transmitter pointed at a target, a local transmitter of a coherent optical radiation having the same wavelength as the preceding radiation, a photovoltaic detector, means for focussing at a point on said detector the radiation reflected by the target, and means for converting the radiation of the local transmitter into a parallel beam and causing said parallel beam to impinge perpendicularly on the surface of said detector, wherein the means for space-time modulating the heterodyne detection are interposed in the path of the radiation from the local transmitter.

REFERENCES:
patent: 3409369 (1968-11-01), Bickel
patent: 3497697 (1970-02-01), Brinkman et al.
patent: 3500050 (1970-03-01), Hillman
patent: 3698811 (1972-10-01), Weil
patent: 3841755 (1974-10-01), Debart

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