Laboratory calibration of a field imaging spectrometer system

Area of Science:

• Optics and Photonics
• Remote Sensing Technology
• Spectroscopy Instrumentation

Background:

• Development of advanced spectral imaging systems is crucial for detailed environmental and material analysis.
• Existing technologies may have limitations in spectral resolution, radiometric accuracy, or signal-to-noise ratio.

Purpose of the Study:

• To introduce and characterize a novel Field Imaging Spectrometer System (FISS) utilizing a cooling area CCD.
• To detail the imaging principles, structural design, and key performance parameters of the FISS sensor.
• To validate the system's capabilities through rigorous spectral and radiometric calibration.

Main Methods:

• Spectral calibration using a double grating monochromator to determine band characteristics (center wavelength, FWHM).
• Absolute radiometric calibration employing an integrating sphere to quantify measurement accuracy.
• Signal-to-noise ratio (SNR) assessment across all spectral channels.

Main Results:

• The FISS system covers a spectral range of 437-902 nm with 344 spectral channels.
• Achieved spectral resolution is better than 5 nm per channel.
• Absolute radiometric calibration error is less than 5% for each band.
• 215 channels (62.5%) exhibit SNRs greater than 500, indicating high sensitivity.

Conclusions:

• The developed Field Imaging Spectrometer System (FISS) demonstrates high performance metrics.
• The system's spectral and radiometric accuracy, coupled with high SNR, confirms its feasibility for practical applications.
• FISS is a promising tool for various scientific and industrial fields requiring detailed spectral information.