Advances have been made in short wave infrared (SWIR) imaging technology to address the most
demanding imaging and surveillance applications. Multiple techniques have been developed and deployed
in Goodrich's SWIR indium gallium arsenide (InGaAs) cameras to optimize the dynamic range
performance of standard, commercial off-the-shelf (COTS) products. New developments have been
implemented on multiple levels to give these cameras the unique ability to automatically compensate for
changes in light levels over more than 5 orders of magnitude, while improving intra-scenic dynamic range.
Features recently developed and implemented include a new Automatic Gain Control (AGC) algorithm,
image flash suppression, and a proprietary image-enhancement algorithm with a simplified but powerful
user command structure.
The design and development of a new, flexible, linear array readout integrated circuit (ROIC) for a new family of linear
array detectors are described in this paper. The detector technology used is based on indium-gallium-arsenide (InGaAs)
and includes low dark current versions with room temperature wavelength response cutoff of 1.7 microns and versions
with altered stoichiometry to shift the room temperature absorbance cutoff wavelength to 2.55 microns. Discussion
includes choice of features to cover many applications, testing methods, and evaluation of the first versions produced.
The result will be a highly flexible linear array family, with versions matched to biological imaging, hot process
inspection, pharmaceutical pill inspection, agricultural sorting and contaminant rejection, plastics recycling, moisture
monitoring of continuous web processes.
Imaging in the short wave infrared (SWIR) can bring useful contrast to situations and applications where visible or thermal imaging cameras are ineffective. This paper will define the short wave infrared technology and discuss developing imaging applications; then describe newly available 2-D (area) and 1-D (linear) arrays made with indium-gallium-arsenide (InGaAs), while presenting the wide range of applications with images and videos. Applications mentioned will be web inspection of continuous processes such as high temperature manufacturing processes, agricultural raw material cleaning and sorting, plastics recycling of automotive and consumer products, and a growing biological imaging technique, Spectral-Domain Optical Coherence Tomography.
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