Abstract
The responsive properties of 74 photoconductive InSb detector array elements are reported. D ∗ (4.6, 840, 1) of each nominally 0.002 in. by 0.037 in. rectangular detector is equal to or greater than 1.1 × 10 11 cm-(cps) 1 2 /W. Responsive measurements were made first with a 180° field of view, and then with an average 56° field of view incorporating a cooled 3.5μ–5.0μ spectral bandpass filter. All measurements were made at a detector temperature of 77° K and a nominal background temperature of 300°K. Theoretically predicted and experimentally observed performance changes due to a reduced background are compared. Performance data is presented for blackbody and spectral detectivity, resistance, optimum bias current, and time constant. The predicted improvement factor for spectral detectivity resulting from the reduction of background radiation is 2.64. The average improvement factor for the 74 detectors reported here is 2.25.
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