A bolometric hyperspectral camera based on a birefringent interferometer for remote sensing in the thermal infrared

Matteo Corti; Fabrizio Preda; Antonio Perri; Ondřej Ballada; Cestmír Barta; Lukáš Chroust; Davide Gatti; Guglielmo Vesco; Luca Moretti; Gianluca Valentini; Giulio Cerullo; Cristian Manzoni

doi:10.1117/12.3031717

1 November 2024 A bolometric hyperspectral camera based on a birefringent interferometer for remote sensing in the thermal infrared

Matteo Corti, Fabrizio Preda, Antonio Perri, Ondřej Ballada, Cestmír Barta, Lukáš Chroust, Davide Gatti, Guglielmo Vesco, Luca Moretti, Gianluca Valentini, Giulio Cerullo, Cristian Manzoni

Author Affiliations +

Proceedings Volume 13200, Electro-Optical and Infrared Systems: Technology and Applications XXI; 132001L (2024) https://doi.org/10.1117/12.3031717
Event: Security + Defence, 2024, Edinburgh, United Kingdom

Abstract

Remote sensing in the thermal infrared (TIR) band (3-14 μm) is an increasingly attractive tool for environmental sciences and security due to its chemical specificity and the large spectral superposition with the atmospheric transparency window. Currently, the technique is largely dominated by dispersive-type hyperspectral imagers, which usually require expensive, cumbersome and cooled quantum detectors setups to compensate for their low optical throughput. Here, we present a compact and low-cost hyperspectral camera based on the Fourier-transform approach. Its main element is a common-path birefringent interferometer made of TIR-transparent crystal calomel (Hg₂Cl₂). We characterize it with both coherent and incoherent sources in the TIR, determining high optical throughput, adjustable spectral resolution up to 4.5 cm^-1, interferometric contrast higher than 90% even for incoherent radiation and a robust and long-term interferometric stability. By coupling the interferometer to an uncooled microbolometer detector with 640x480 pixels, we demonstrate hyperspectral imaging in the 8-14 μm spectral range for transmission and emission remote measurements.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Matteo Corti, Fabrizio Preda, Antonio Perri, Ondřej Ballada, Cestmír Barta, Lukáš Chroust, Davide Gatti, Guglielmo Vesco, Luca Moretti, Gianluca Valentini, Giulio Cerullo, and Cristian Manzoni "A bolometric hyperspectral camera based on a birefringent interferometer for remote sensing in the thermal infrared", Proc. SPIE 13200, Electro-Optical and Infrared Systems: Technology and Applications XXI, 132001L (1 November 2024); https://doi.org/10.1117/12.3031717

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