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  4. Substantial increase in detection efficiency for filter array-based spectral sensors
 
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2020
Journal Article
Title

Substantial increase in detection efficiency for filter array-based spectral sensors

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 (17.5 mm × 17.5 mm × 7.8 mm), and integrated completely inside the CCD camera mount.
Author(s)
Kobylinskiy, A.
Laue, B.
Förster, E.
Höfer, B.
Shen, Y.
Hillmer, H.
Brunner, R.
Journal
Applied optics  
Open Access
DOI
10.1364/AO.382714
Additional full text version
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Language
English
Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF  
Keyword(s)
  • CCD cameras

  • optical system

  • wave filters

  • absorption loss

  • detection efficiency

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