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Proceedings Paper

Aural stealth of portable cryogenically cooled infrared imagers
Author(s): Alexander Veprik; Herman Vilenchik; Ramon Broyde; Nachman Pundak
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Paper Abstract

Novel tactics for carrying out military and antiterrorist operations calls for the development of a new generation of portable infrared imagers, the focal plane arrays of which are maintained at a cryogenic temperature. The rotary Stirling cryogenic engines providing for this cooling are usually mounted directly upon the light thin-walled imager frame, which is used for optical alignment, mechanical stability and heat sinking. The known disadvantage of this design approach is that the wideband vibration export produced by the cooler results in structural resonances and therefore in excessive noise radiation from the above imagers. The "noisy" thermal imager may be detected from quite a long distance using acoustic equipment relying upon a high-sensitive unidirectional microphone or aurally spotted when used in a close proximity to the opponent force. As a result, aural stealth along with enhanced imagery, compact design, low power consumption and long life-times become a crucial figure of merit characterising the modern infrared imager. Achieving the desired inaudibility level is a challenging task. As a matter of fact, even the best examples of modern "should-be silent" infrared imagers are quite audible from as far as 50 meters away even when operating in a steady-state mode. The authors report on the successful effort of designing the inaudible at greater then 10 meters cryogenically cooled infrared imager complying with the stringent MIL-STD-1774D (Level II) requirements.

Paper Details

Date Published: 18 May 2006
PDF: 12 pages
Proc. SPIE 6206, Infrared Technology and Applications XXXII, 620625 (18 May 2006); doi: 10.1117/12.665413
Show Author Affiliations
Alexander Veprik, RICOR Cryogenic & Vacuum Systems (Israel)
Herman Vilenchik, RICOR Cryogenic & Vacuum Systems (Israel)
Ramon Broyde, RICOR Cryogenic & Vacuum Systems (Israel)
Nachman Pundak, RICOR Cryogenic & Vacuum Systems (Israel)

Published in SPIE Proceedings Vol. 6206:
Infrared Technology and Applications XXXII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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