From Event: SPIE Defense + Commercial Sensing, 2019
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.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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 (Presented at SPIE Defense + Commercial Sensing: April 15, 2019; Published: 14 May 2019); https://doi.org/10.1117/12.2518550.6036148791001.