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Proceedings Paper

Lock-in optical instrumentation for snapshot hyperspectral imaging
Author(s): C. Harrison Brodie; Jasen Devasagayam; Christopher M. Collier
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Paper Abstract

Hyperspectral imaging (HSI) technology has become prominent, with a wide range of applications: food quality control, crop monitoring, and medical diagnostics. As HSI is able to capture spatial and spectral data, it is highly desirable, but highly complex. However, this functionality presents a challenge for data acquisition as three-dimensional HSI images must be acquired by an image sensor of one less dimension. Thus, HSI systems are often pushbroom systems, with twodimensional images being successively constructed over time from line scans. Additionally, HSI is expensive and difficult to operate. A snapshot HSI system is developed to address these challenges, whereby the additional image dimension is encoded onto an occupied dimension on the image sensor. Additionally, the snapshot HSI system is constructed from low cost, readily available components. The presented snapshot HSI system consists of a transparent diffraction optical disc bonded to an aperture mask, with alternating transparent and opaque regions, acting as an optical chopper when rotated by a DC brushless motor. This allows separation of the spectra of overlapped pixels on the HSI image sensor. When an incident beam passes through this optical chopper, many frequencies (corresponding to spatial channels) are imposed by the binary mask, while undergoing diffraction across the visible spectrum. Overlapped spectra are directed at a charge coupled device, where Fourier analyses distinguish each spatial channel. System geometry is used to transform the Fourier amplitude spectra into functions of wavelength for each spatial pixel. The design is experimentally validated through comparison to a commercially available spectrometer.

Paper Details

Date Published: 2 March 2020
PDF: 7 pages
Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 1128710 (2 March 2020); doi: 10.1117/12.2538484
Show Author Affiliations
C. Harrison Brodie, Univ. of Guelph (Canada)
Jasen Devasagayam, Univ. of Guelph (Canada)
Christopher M. Collier, Univ. of Guelph (Canada)

Published in SPIE Proceedings Vol. 11287:
Photonic Instrumentation Engineering VII
Yakov Soskind; Lynda E. Busse, Editor(s)

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