Abstract

A self-scanned photodiode array has been used to detect the image from a Fabry-Perot spectrograph, the recording being a cut along a diameter of the interference pattern. A microcomputer plus a 12-bit analog-to-digital converter are employed to store numerically the data as a central logic system and to eliminate the fixed pattern noise of the array. From the spatial photosensibility distribution, we can restore the profile of the light distribution at the sampled points. Using the Shannon interpolation method on these ideal samples, we can thus pinpoint precisely the maxima of the fringes and linearize the spectra. Theoretical and experimental comparisons with photographic plates pointed out an improvement in the SNR for the photodiode system and open up interesting and useful applications to Fabry-Perot spectrography.

© 1980 Optical Society of America

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