Abstract
We introduce a high-performance hyperspectral camera based on the Fourier-transform approach, where the two delayed images are generated by the Translating-Wedge-Based Identical Pulses eNcoding System (TWINS) [Opt. Lett. 37, 3027 (2012)], a common-path birefringent interferometer that combines compactness, intrinsic interferometric delay precision, long-term stability and insensitivity to vibrations. In our imaging system, TWINS is employed as a time-scanning interferometer and generates high-contrast interferograms at the single-pixel level. The camera exhibits high throughput and provides hyperspectral images with spectral background level of -30dB and resolution of 3 THz in the visible spectral range. We show high-quality spectral measurements of absolute reflectance, fluorescence and transmission of artistic objects with various lateral sizes.
Highlights
A great deal of physico-chemical information on objects can be obtained by measuring the spectrum of the light they emit, scatter or reflect
We introduce a high-performance hyperspectral camera based on the Fouriertransform approach, where the two delayed images are generated by the Translating-WedgeBased Identical Pulses eNcoding System (TWINS) [Opt
hyperspectral imaging (HSI) is a powerful technique for a wide range of fundamental and applied studies in fields as diverse as remote sensing [5,6], medical imaging [7], agriculture [8,9], coastal and geological prospecting [10,11], safety and security [12], archaeology [13,14] and conservation science [15]
Summary
A great deal of physico-chemical information on objects can be obtained by measuring the spectrum of the light they emit, scatter or reflect. A FT-based imaging system must fulfil two key requirements: (i) the delay of the replicas must be controlled to within a fraction (1/100 or better) of the optical cycle (e.g., 0.02 fs at 600 nm); (ii) the bundle of rays that form the interferogram at a given pixel must have a high degree of coherence. An imaging system must maintain coherence (i.e., similar path delay) between the rays of the bundle that form the interferogram at a given pixel To this aim, we will follow the pencil of rays propagating from one object point O to the detector surface of our camera, and we will calculate the relative phase they accumulate due to the interferometer. The high visibility demonstrates that our scheme is well suited for FT HSI
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