Setup for characterising the spectral responsivity of Fabry-Perot-interferometer-based hyperspectral cameras

Oskari Pekkala*, Tomi Pulli, Alexander Kokka, Erkki Ikonen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Hyperspectral cameras capture the spectral power distribution of the objects in the imaged view via dozens of narrow-band spectral channels of the camera. Knowledge of the spectral responsivity of the channels is essential when interpreting the acquired hyperspectral data and assessing its reliability. The spectral responsivity of the camera channels may vary within the image area. This paper presents a measurement setup and data analysis routine for characterising the spectral responsivity of a hyperspectral camera. This method was used to characterise the spectral responsivity of a Fabry-Perot-interferometer-based hyperspectral camera. The characterisation method implemented in this study was able to reveal several channel leaks in the measured wavelength range. In the image area there is an approximately 1.5 nm shift in the channel wavelengths, and up to 10% variation in the channel bandwidths. The expanded uncertainties (k = 2) for the measured channel bandwidths, sensitivities and wavelengths were 7.9%, 9.5% and 0.64 nm, respectively.

Original languageEnglish
Article number065005
Number of pages6
JournalMetrologia
Volume56
Issue number6
DOIs
Publication statusPublished - Dec 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • hyperspectral imaging
  • spectral responsivity
  • camera calibration
  • Fabry-Perot-interferometer
  • IDENTIFICATION

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