Abstract
For high-performance microbolometric focal plane array, a pair of mutually restricted microbolometer performance parameters are analyzed and discussed. The main parameters optimization contradiction is between the microbolometric infrared signal to noise ratio and signal bandwidth, and these two performance characteristics parameters are decisive to the target-temperature resolution and imaging speed of the microbolometric focal plane array respectively. The microbolometric output signal to noise ratio of unit-power infrared signal and signal bandwidth are theoretically derived from the thermal balance equation of the typical microbolometer, and some vital factors to cause the optimization contradiction between them are revealed through theoretical analyses and numerical calculations. The microbolometer parameters optimization method based on these theoretical analyses and numerical calculations is pointed out, which can be guidable to design, fabricate and operate microbolometric focal plane arrays with high-performance characteristic parameters such as high temperature resolution and infrared image speed.
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