Sensors and spectral ranges

In order to obtain a spectral dispersion, different spectrometer concepts are used for spectral imaging.

The spectrometers used to date for hyperspectral imaging are all dispersive. They are less sensitive than conventional laboratory spectrometers, especially those based on the Fourier transform (FT) technique. However, the advantage of the systems lies in the use of spectral information in the area. Deviations in the area can be detected even with a poorer signal-to-noise ratio.

Just like the spectrometers of the HSI systems, the detectors are also tuned to a defined spectral range. Conventional silicon detectors (Si) are used for the spectral range from approx. 250 nm to approx. 1000 nm, while special semiconductor materials such as indium gallium arsenide (InGaAs) or mercury cadmium telluride (MCT) are used for the near infrared range above 1000 nm. Frequently used and commercially available spectral ranges for hyperspectral imaging are listed below. 

Depending on the detector, HSI systems now achieve up to 400 Hz at full resolution and >1000 Hz with binning or by selecting individual spectral channels (region of interest, ROI). 


Revision #4
Created 8 August 2024 16:56:49 by Admin
Updated 8 August 2024 17:07:46 by Admin