Device for determining the direction towards a remote object

Details Device for determining the direction towards a remote object Device for determining the direction towards a remote object

1977-12-14

1979-12-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356152, G01J 120

Patent

active

041785053

ABSTRACT:
An apparatus for measuring the coordinates of a target object with respect to a reference point within a particular field of view. A mask having a radiation transparent portion bounded by a straight line and a substantially logarithmic curve meeting at the reference point rotates about the reference point at a reference frequency to modulate a beam of radiant energy from the target object. The modulated beam is applied to a detector that generates corresponding electrical pulses having a duration that corresponds to the radial distance of the target object from the reference point. The phase shift of the pulses with respect to the reference frequency determines the angular position of the target.

REFERENCES:
patent: 2931912 (1960-04-01), MacLeish
patent: 2972812 (1961-02-01), Jackson, Jr.
patent: 2997699 (1961-08-01), Lovell
patent: 3000255 (1961-09-01), Iddings
patent: 3134022 (1964-05-01), Jones et al.
patent: 3263084 (1966-07-01), Boydell
patent: 3541335 (1970-11-01), Harrington et al.

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