Abstract
Spectral image filtration by means of acousto-optical tunable filters (AOTFs) has multiple applications. For its implementation, a few different optical schemes are in use. They differ in image quality, number of coupling components, dimensions and alignment complexity. To choose the optical system of AOTF-based spectral imager properly, many factors have to be considered. Though various schemes of acousto-optic (AO) filtration have been tested and discussed, their comparative analysis has not been reported up to now. In this study, we assembled the four most popular schemes (confocal, collimating, tandem and double-path) using the same AO cells and experimentally compared their main features. Depending on the application, each scheme may be the basis of compact cost-effective spectral imaging devices.
Highlights
acousto-optical tunable filters (AOTFs) have become a popular tool for various hyperspectral imaging applications in biomedicine [1,2], agriculture [3,4], aerospace [5,6] and other fields
Characteristics, the optical scheme of AO spectral filtration has a strong influence on the features of AOTF-based images [11]
The same typical AO cell (AOC) operating in a conventional wide-aperture mode were exploited
Summary
AOTFs have become a popular tool for various hyperspectral imaging applications in biomedicine [1,2], agriculture [3,4], aerospace [5,6] and other fields. The imaging capabilities of AOTF-based systems are defined by multiple factors. E.g., geometry of AO interaction, shape of AO cell (AOC) and structure of ultrasound beam [8,9,10], have been examined and discussed in detail. Besides these AOTF characteristics, the optical scheme of AO spectral filtration has a strong influence on the features of AOTF-based images [11].
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