Compressed sensing hyperspectral imaging in the 09–25  μm shortwave infrared wavelength range using a digital micromirror device and InGaAs linear array detector

Abstract

A hyperspectral imaging system based on compressed sensing has been developed to image in the 0.9-2.5 μm shortwave infrared wavelengths. With a programmable digital micromirror device utilized as spatial light modulator, we have successfully performed spectrally resolved image reconstruction with a 256-element InGaAs linear array detector without traditional raster scanning or a push-broom mechanism by a compressed sensing (CS) single-pixel camera approach. The chemical sensitivity of the imaging sensor to near-infrared (NIR) overtone signatures of hydrocarbons was demonstrated using hydrocarbon and ink patterns on glass, showing spectral selectivity for the chemical components. Compared to point-by-point raster scanning, we show that the CS scheme can effectively accelerate image acquisition with lower but reasonable quality.

Chip-scale short-wavelength infrared InGaAs microspectrometer based on a linear variable optical filter

“…Attempts have been made to develop large-format extended SWIR InGaAs FPA sensors with cutoff wavelengths of 1700 nm or longer, leading to both higher spectral and spatial resolutions for multispectral imaging. 7,8 Unlike mid-wave (MW, 3-5 mm) and long-wave (LW, 8-14 mm) infrared (IR) imaging enabled by sensing emitted thermal radiation from objects, SWIR imaging in the spectral region of 1-3 mm is realized by detecting reflected light from objects illuminated by natural sources, such as sunlight and the night glow of the upper atmosphere, or by artificial sources, such as eye-safe light-emitting diodes and lasers operating beyond 1.4 mm. SWIR imaging offers unique advantages over visible and MW/LWIR imaging in that it can acquire spectral reflectance from objects under various adverse environments such as haze, smoke, fog, rain, or snow owing to minimal optical scattering effects.…”

Earth Observation via Compressive Sensing: The Effect of Satellite Motion

“…This approach has the advantage of a reduced acquisition time with respect to the classical SPC, but allows to acquire only multispectral images. A pushbroom hyperspectral device has also been reported to record static images, where the slit is moved across the field of view and CS performed within the single image slice [39].…”

Compressive Sampling Using a Pushframe Camera

“…Other 'SPC array' works do not feature important aspects of our approach. Arnob et al's system ( [18]) is static, and uses the linear detector to have a set of SPCs where each handles a different spectral range, a diffraction grating having been added just before the detector in an otherwise conventional SPC design, with the whole scene sampled at once. Fowler's theoretical paper ( [19]) is more relevant, with outlines for compressive pushbroom and whiskbroom devices, but again the aim is hyperspectral capture.…”