An optical readout method based uncooled infrared imaging system
International Journal of Infrared and Millimeter Waves 2008,Volume 29, Number 3
Authors:Binbin Jiao , Chaobo Li, Dapeng Chen1 , Tianchun Ye, Yi Ou, Lijun Dong, Qingchuan Zhang, Zheying Guo and Fengliang Dong
Abstract This paper presents an optical readout method based uncooled infrared imaging system that contains an optical read-
out section and a bi-material micro-cantilever arrays (BMCA) detector. The optical read-out section is based on incoherent
light spatial filter technique. The read-out section converts the deflection angles of BMCA caused by absorption of infrared
(IR) radiation to a visible image through optical filtering operation of the BMCA with a knife-edge filter. A spatial
mathematical model is presented to describe the read-out method and its validity is proved. The IR image of a person’s hand
obtained through the using of the 100?×?100 BMCA and the 12-bit A/D quantizer demonstrates the ability of the system to create
image. The performance test shows that the average Noise-equivalent temperature difference (NETD) of the imaging system can
arrive at about 183mK with some areas having a NETD as low as 78mK.
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