Extended spectrum SWIR camera with user-accessible Dewar

Brendan Benapfl; John Lester Miller; Hari Vemuri; Christoph Grein; Siva Sivananthan

doi:10.1117/12.2262200

3 May 2017 Extended spectrum SWIR camera with user-accessible Dewar

Brendan Benapfl, John Lester Miller, Hari Vemuri, Christoph Grein, Siva Sivananthan

Proceedings Volume 10177, Infrared Technology and Applications XLIII; 1017709 (2017) https://doi.org/10.1117/12.2262200
Event: SPIE Defense + Security, 2017, Anaheim, CA, United States

Abstract

Episensors has developed a series of extended short wavelength infrared (eSWIR) cameras based on high-Cd concentration Hg_1-xCd_xTe absorbers. The cameras have a bandpass extending to 3 microns cutoff wavelength, opening new applications relative to traditional InGaAs-based cameras. Applications and uses are discussed and examples given. A liquid nitrogen pour-filled version was initially developed. This was followed by a compact Stirling-cooled version with detectors operating at 200 K. Each camera has unique sensitivity and performance characteristics. The cameras’ size, weight and power specifications are presented along with images captured with band pass filters and eSWIR sources to demonstrate spectral response beyond 1.7 microns. The soft seal Dewars of the cameras are designed for accessibility, and can be opened and modified in a standard laboratory environment. This modular approach allows user flexibility for swapping internal components such as cold filters and cold stops. The core electronics of the Stirlingcooled camera are based on a single commercial field programmable gate array (FPGA) that also performs on-board non-uniformity corrections, bad pixel replacement, and directly drives any standard HDMI display.

Citation Download Citation

Brendan Benapfl, John Lester Miller, Hari Vemuri, Christoph Grein, and Siva Sivananthan "Extended spectrum SWIR camera with user-accessible Dewar", Proc. SPIE 10177, Infrared Technology and Applications XLIII, 1017709 (3 May 2017); https://doi.org/10.1117/12.2262200

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KEYWORDS

Cameras

Short wave infrared radiation

Field programmable gate arrays

Readout integrated circuits

Staring arrays

Agriculture

Infrared cameras

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