METHOD AND APPARATUS FOR THE DETECTION OF HELICOPTERS
Assignee
CARL-ZEISS-STIFTUNG, HEIDENHEIM/BRENZ, DBA CARL ZEISS
Filed
Sep 14, 1978
Granted
Jun 27, 1989
Location
DE
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.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Jun 2, 1983
Rescinded
Jul 30, 1986
Duration
3 years, 1 month
Inventor
- 1GUNTHER KURBITZ
Record Details
- Patent number
- US 4842247
- Application
- 05944606
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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