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14 May 2019 Technique for sub-pixel calibration of compact spectrometers (Conference Presentation)
Guy Beadie, Michael Brindza, Richard Flynn, Armand Rosenberg, James S. Shirk
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Proceedings Volume 11007, Advanced Environmental, Chemical, and Biological Sensing Technologies XV; 110070H (2019) https://doi.org/10.1117/12.2518550
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States
Abstract
Vendor-supplied calibration curves for fixed-grating, fixed-detector-array portable spectrometers typically provide wavelength accuracies of about ±1 pixel on the array. Independent calibration using atomic lamp spectra is hampered by the sparsity of available lines: interpolation between atomic lines typically leads, again, to pixel-width errors or greater. We provide a technique that combines information from sparse atomic line spectra with densely populated peaks from the transmission spectrum of an air-spaced etalon to generate calibration curves capable of ~1/10th pixel accuracies across entire detector arrays. Subsequent transmission spectra through solid etalons of well-characterized glass samples validate the calibration procedure.
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Guy Beadie, Michael Brindza, Richard Flynn, Armand Rosenberg, and James S. Shirk "Technique for sub-pixel calibration of compact spectrometers (Conference Presentation)", Proc. SPIE 11007, Advanced Environmental, Chemical, and Biological Sensing Technologies XV, 110070H (14 May 2019); https://doi.org/10.1117/12.2518550
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KEYWORDS
Calibration
Spectrometers
Spectral calibration
Fabry–Perot interferometers
Detector arrays
Glasses
Lamps
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