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31 May 2005 A 320x256 InGaAs camera for range gated and staring applications
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Abstract
We report on a 320 x 256 pixel InGaAs focal plane array based camera with the ability to perform range gated imaging with sub-200 ns gates, while also allowing integration times longer than 16 ms for imaging in a staring mode at video rates. The combination of gated and video imaging is achieved through a high bandwidth pixel with a capacitive transimpedance amplifier (CTIA) design. The low dark current and high bandwidth of the InGaAs photodetectors enables both high sensitivity imaging at long exposure times and high bandwidth at short exposure times. The pixels are fabricated on a 25 μm pitch allowing for a compact device, and all pixels are gated simultaneously for "snapshot" exposure. The all solid-state gated camera improves reliability, while also allowing the system to be small and lightweight. The spectral sensitivity of InGaAs extends from 0.9 μm to 1.7 μm, allowing the use of eye-safe commercially available pulsed lasers with 1.5 μm wavelength, several millijoule pulse energies, and nanosecond scale pulse durations. In these experiments a 4 mJ and 2 ns pulse has allowed gated imaging to be achieved with a target at a range greater than 350 m away.
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Martin H. Ettenberg, Robert M. Brubaker, Michael A. Blessinger, and Vincent J. Burzi "A 320x256 InGaAs camera for range gated and staring applications", Proc. SPIE 5783, Infrared Technology and Applications XXXI, (31 May 2005); https://doi.org/10.1117/12.603777
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