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–Pérot-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.
Highlights
Hyperspectral cameras capture the spectrum of the objects in the imaged view
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–Pérot-interferometer-based hyperspectral camera
Summary
The spectrum, i.e. spectral power distribution, is measured via the dozens of spectral channels, known as bands, of the camera. Reliable characterisation of the spectral responsivity of the channels of the camera is essential for processing hyperspectral data and when assessing its reliability. Distributions measured with the camera need to be weighted by the relative spectral sensitivities of the channels, otherwise the spectra will appear distorted, potentially leading to false interpretations in data analysis [7]. The channels may contain spectral irregularities, such as regions of sensitivity outside the main channel, known as channel leaks Characterising these irregularities allows their effect on the measured spectrum to be estimated and corrected. This work presents a measurement setup, measurement procedure and data analysis routine for characterising the spectral responsivity of a Fabry–Pérot-interferometer-based hyperspectral camera. The presented method is independent of the inner architecture of the camera under study, and can be generalised to most hyperspectral cameras
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