Method and apparatus for the detection of helicopters

Details Method and apparatus for the detection of helicopters Method and apparatus for the detection of helicopters

1978-09-14

1989-06-27

Buczinski, Stephen C.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250340, G01J 100

Patent

active

048422479

ABSTRACT:
The presence of an operating helicopter within a given field of view is remotely and passively monitored by optically imaging the field of view at a focal surface, using an infrared detector to produce an electrical signal. The electrical signal is filtered with a narrow pass-band having a center frequency which is adjustable over a range which spans the respective modulation frequencies of characteristic infrared radiation emitted by the rotating blades of each of a plurality of helicopters of different type. Provision is made to indicate such component of the electrical signal as survives the filtering step.

REFERENCES:
patent: 3582970 (1971-06-01), Williams
patent: 3733603 (1973-05-01), Johnston
patent: 4001820 (1977-01-01), Rosenbaum et al.
patent: 4040744 (1977-08-01), Schertz et al.

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