14 July 1999 Passive millimeter-wave camera images: current and future
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Abstract
Lockheed Martin and Intelligent Machine Technology are working to build a demonstration system for the Department of Justice and the Air Force Research Laboratory that can be extended to take advantage of rapidly moving semiconductor improvements. Our current radiometer modules use a PIN switch for the Dicke calibration function followed by multiple low noise amplifier stages, a Schottky detector and a video amplifier. Sensitivity of such modules is primarily a function of the insertion loss and noise figure of the front end MMIC circuits. Processing improvements at Lockheed Martin and refined chip design will result in a 3 dB improvement in the effective noise figure within the next year. Imaging is also greatly improved by achieving greater effective bandwidth and higher operating frequency. Whereas present modules operate from 80 to 90 GHz, MMIC improvements will provide for operation up to 140 GHz with a doubling of the bandwidth in the near term. Receiver operation up to 540 GHz has also been demonstrated at other labs.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lee Mirth, Al Pergande, Dayton D. Eden, Lawrence Y. Chu, "Passive millimeter-wave camera images: current and future", Proc. SPIE 3703, Passive Millimeter-Wave Imaging Technology III, (14 July 1999); doi: 10.1117/12.353005; https://doi.org/10.1117/12.353005
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