Computer Science – Performance
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1686...76k&link_type=abstract
In: Test and evaluation of IR detectors and arrays II; Proceedings of the Meeting, Orlando, FL, Apr. 22, 23, 1992 (A94-12744 02-
Computer Science
Performance
Infrared Detectors, Microwaves, Photodiodes, Radiation Effects, Background Noise, Cryogenic Equipment, Radar Equipment, Sidelobes
Scientific paper
Infrared sensors are being incorporated in more systems and are often placed close to radar systems. The IR sensor is thus subjected to various microwave levels from the sidelobes or reflections of the radar pulses. In this paper we address the effect of microwaves on the performance of mercury-cadmium-telluride longwave photodiodes. We examine the effects of microwaves entering directly through the optical window (front-door mechanism) and entering along wires connected to the dewar (back-door mechanism). The diode noise voltage was measured before, during, and after the microwaves pulses by transimpedance amplification. The diode noise characteristics were shown to respond very rapidly to the microwave pulse. A linear relationship between detector noise and microwave power was observed. A strong dependence of noise on microwave frequency was observed and attributed to the resonances of the dewar design.
Karins James P.
Pasour John A.
Seeley Robert D.
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