Method of Electronic Calibration of the Measurement Channels of Multichannel Analyzers of Atomic Emission Spectra
D. O. Selyunin, V. A. Labusov, D. V. Petrochenko, V. L. Miroshnichenko, O. A. Neklyudov, G. V. Rechkin
Keywords: spectroscopy, multielement solid-state detectors, photoresponse nonlinearity, Chebyshev polynomials
Pages: 67-76
Abstract
A method of electronic calibration of measurement channels of multichannel analyzers of atomic emission spectra is developed for reducing nonlinearity of the dependence of the photoresponse of each channel on input radiation intensity, which is provided by obtaining measurement channel characteristics, their approximation by Chebyshev polynomials, and subsequent application of the calculated polynomial coefficients for output signal correction. A specialized unit of electronic registration and corresponding software are developed for such calibration. It is experimentally demonstrated that the measurement signal nonlinearity can be substantially reduced by using the electronic calibration. In this case, the residual nonlinearity of the photoresponse dependence on the number of photons incident onto the photodiode during the exposure time is within 1%.
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