Substantial increase in detection efficiency for filter array-based spectral sensors
- 10 March 2020
- journal article
- research article
- Published by Optica Publishing Group in Applied Optics
- Vol. 59 (8), 2443-2451
- https://doi.org/10.1364/AO.382714
Abstract
A method that significantly increases the detection efficiency of filter array-based spectral sensors is proposed. The basic concept involves a wavelength-dependent redistribution of incident light before it reaches the filter elements located in front of the detector. Due to this redistribution, each filter element of the array receives a spatially concentrated amount of a pre-selected and adjusted spectral partition of the entire incident light. This approach can be employed to significantly reduce the reflection and absorption losses of each filter element. The proof-of-concept is demonstrated by a setup that combines a series of consecutively arranged dichroic filters with Fabry-Perot filter arrays. Experimentally, an efficiency increase by a factor larger than 4 compared to a reference system is demonstrated. The optical system is a non-imaging spectrometer, which combines the efficiency enhancement module with the filter arrays, is compact (17.5mm x 17.5mm x 7.8 mm), and integrated completely inside the CCD camera mount. (C) 2020 Optical Society of AmericaFunding Information
- Carl Zeiss Spectroscopy GmbH
- Scia Systems GmbH
- Bundesministerium für Bildung und Forschung (03IHS107B, 13FH6571X6)
- Thüringer Ministerium für Wirtschaft, Wissenschaft und Digitale Gesellschaft (2016 FGR 0031)
- European Social Fund (2016 FGR 0031)
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