High-sensitive thermal video camera with self-scanned 128 InSb linear array

Hiroyuki Fujisada

doi:10.1117/12.48772

1 December 1991 High-sensitive thermal video camera with self-scanned 128 InSb linear array

Hiroyuki Fujisada

Proceedings Volume 1540, Infrared Technology XVII; (1991) https://doi.org/10.1117/12.48772
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

A compact thermal video camera with very high sensitivity has been developed by using a self-scanned 128 InSb linear array photodiode. Two-dimensional images are formed by a self- scanning function of the linear array focal plane assembly in the horizontal direction and by a vibration mirror in the vertical direction. Images with 128 X 128 pixel number are obtained every 1/30 seconds. A small size InSb detector array with a total length of 7.68 mm is utilized in order to build the compact system. In addition, special consideration is given to a configuration of optics, vibration mirror, and focal plane assembly. Real-time signal processing by a microprocessor is carried out to compensate inhomogeneous sensitivities and irradiances for each detector. The standard NTSC TV format is employed for output video signals. The thermal video camera developed had a very high radiometric sensitivity. Minimum resolvable temperature difference (MRTD) is estimated at about 0.02 K for 300 K target. The stable operation is possible without blackbody reference, because of very small stray radiation.

Citation Download Citation

Hiroyuki Fujisada "High-sensitive thermal video camera with self-scanned 128 InSb linear array", Proc. SPIE 1540, Infrared Technology XVII, (1 December 1991); https://doi.org/10.1117/12.48772

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