Performance characterization of VNIR and SWIR spectropolarimetric imagers

Gupta, Neelam

doi:10.1117/12.2177099

Cited by 2 publications

(1 citation statement)

References 20 publications

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“…Therefore, only InGaAs FPAs operate effectively and are easily accessible in the low light condition of SWIR. Most ground-based SWIR AOTF systems must use the InGaAs FPA, which can only detect in a range of 900–1700 nm [15,16].…”

Section: Introductionmentioning

confidence: 99%

SWIR AOTF Imaging Spectrometer Based on Single-pixel Imaging

Zhao

Jiang

et al. 2019

Sensors

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An acousto-optic tunable filter (AOTF) is a new type of mono-wavelength generator, and an AOTF imaging spectrometer can obtain spectral images of interest. However, due to the limitation of AOTF aperture and acceptance angle, the light passing through the AOTF imaging spectrometer is weak, especially in the short-wave infrared (SWIR) region. In weak light conditions, the noise of a non-deep cooling mercury cadmium telluride (MCT) detector is high compared to the camera response. Thus, effective spectral images cannot be obtained. In this study, the single-pixel imaging (SPI) technique was applied to the AOTF imaging spectrometer, which can obtain spectral images due to the short-focus lens that collects light into a small area. In our experiment, we proved that the irradiance of a short-focus system is much higher than that of a long-focus system in relation to the AOTF imaging spectrometer. Then, an SPI experimental setup was built to obtain spectral images in which traditional systems cannot obtain. This work provides an efficient way to detect spectral images from 1000 to 2200 nm.

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Section: Introductionmentioning

confidence: 99%

SWIR AOTF Imaging Spectrometer Based on Single-pixel Imaging

Zhao

Jiang

et al. 2019

Sensors

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Notch filtering using a multiple passband AOTF in the SWIR region

Gupta

Suhre²

2016

Appl. Opt.

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A notch filtering operation was accomplished using a TeO₂ acousto-optic tunable filter (AOTF) with 16 simultaneous overlapping passbands in the shortwave infrared wavelength region. By switching off specific radio frequency signals applied to the AOTF, laser wavelengths corresponding to the inactive passbands are rejected, providing see-through capability with the remaining wavelengths. The rejection level was determined by leakage through the sidelobes of adjacent passbands, as was shown by theory and corresponding measurements. By switching off multiple passbands near the laser wavelength, the rejection level can be increased at the expense of reduced see-through capability. The AOTF imaging system used telecentric confocal optics that compensate for AOTF aberrations, which are severe at high sidelobe operation.

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Performance characterization of VNIR and SWIR spectropolarimetric imagers

Cited by 2 publications

References 20 publications

SWIR AOTF Imaging Spectrometer Based on Single-pixel Imaging

SWIR AOTF Imaging Spectrometer Based on Single-pixel Imaging

Notch filtering using a multiple passband AOTF in the SWIR region

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