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A method is presented for measuring the ac conductance of an infrared detector element at low frequencies and low photon flux levels. This alleviates the difficulties sometimes encountered with dc measurement. A slightly sublinear response was found for mercury−doped germanium detectors at 10 °K.

A novel optical technique for improving the performance of focal plane staring arrays by increasing the fill factor ratio is described. The specific mosaics considered are 64 x 32 and 128 x 64 arrays of infrared detectors with charge coupled devices (IRCCD) made from monolithic silicon.The video enhancement is accomplished by means of a refracting silicon faceplate that redirects focused image irradiance from nonsensitive CCD areas to the infrared detector elements.Operational theory and design parameters for this unique faceplate construction are detailed. With the optimum faceplate configuration installed at the IRCCD front surface, a sensitivity increase of at least 150 percent is predicted from the analysis presented here.

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