Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-04-14
1976-08-31
Griffin, Robert L.
Telegraphy
Systems
Simplex-reversing periodic
178DIG8, H04N 530
Patent
active
039782816
ABSTRACT:
A TV compatible infrared imaging system employs horizontal and vertical oscillating scan mirrors which are driven in synchronism. The horizontal mirror oscillates at a fraction of the usual television horizontal scan rate while the vertical mirror is driven at the usual TV field rate. As the mirrors oscillate, the system scans back and forth across the scene being viewed, the radiation from that scene being imaged on an infrared detector. The radiance patterns from each oscillatory scanned horizontal line pair, one sweeping from left to right and the other sweeping from right to left are converted by a "line converter" to a pair of constant rate horizontal lines sweeping from left to right so that the output of the system can be applied directly to a conventional television recorder or receiver. Radiometric calibration of any point in the scene is achieved by sampling the incident radiation when the system is scanning that particular point within the scene and comparing it with the known temperature of a shutter placed momentarily in the optical path. The system also includes infrared optics optionally placed in the optical path to adapt the instrument to telescopic and microscopic applications.
REFERENCES:
patent: 2717329 (1955-09-01), Jones et al.
patent: 3704342 (1972-11-01), Stoddard et al.
patent: 3794762 (1974-02-01), Zukerman et al.
patent: 3804976 (1974-04-01), Gard
patent: 3849592 (1974-11-01), Rosenheck
patent: 3883685 (1975-05-01), Yumde et al.
patent: 3895182 (1975-07-01), Trilling
Griffin Robert L.
Psitos Aristotelis M.
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