Tech Briefs Magazine - March 2021 - PIT-23

* Straylight
* F#
* Spectral response function
* Detector parameters
* Environmental stability
To evaluate the performance of a
hyperspectral system, we need to introduce the term point-spread function
(PSF). This is the shape of the intensity
curve for the energy that hits the detector through the optics from a point
source.
Ideally, in a pushbroom hyperspectral
system, the spatial sampling is the same
for all bands. In reality, this is never true
and results in spatial misregistration.
For one position in the FOV, the
shape, size, and position of the center
of gravity for the PSF should be the
same across all bands. A design goal is
to make the PSF shape and size as similar as possible for all positions in the
FOV. In real-life applications, the spatial misregistration itself[1] and the different sources causing spatial misregistration[2] are of great importance, and
it can be shown how differences in its
gravity[3] can compromise data processing results.

Hyperspectral camera calibration.

Spectral misregistration is also very
important for the spectral fidelity of a
hyperspectral system. As with spatial misregistration, the shape, size, and position of the spectral PSF is important. To
avoid spectral aliasing, the width of the
PSF should be kept close to two spectral

Cov

ToC

bands, but in many situations, sharper
optics than this are preferred.
There are many reasons for making
sharp optics per pixel and per band.
For any given detector, with a given
detector pitch, the imaging spectrometer will always output more informa-



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Tech Briefs Magazine - March 2021

Table of Contents for the Digital Edition of Tech Briefs Magazine - March 2021

Tech Briefs Magazine - March 2021 - Intro
Tech Briefs Magazine - March 2021 - Cov4
Tech Briefs Magazine - March 2021 - Cov1
Tech Briefs Magazine - March 2021 - Cov2
Tech Briefs Magazine - March 2021 - 1
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Tech Briefs Magazine - March 2021 - Cov3
Tech Briefs Magazine - March 2021 - Cov4
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