FREQUENCY RESPONSE OF NORRIS GAP DERIVATIVES AND ITS PROSPERITIES FOR GAS SPECTRA ANALYSIS

• Main Author: Sławomir Cięszczyk
• Format: Article
• Language: English
• Published: Lublin University of Technology 2020-12-01
• Series: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
• Subjects: Norris method; optical spectra derivative; spectroscopy; signal processing
• Online Access: https://ph.pollub.pl/index.php/iapgos/article/view/2101

The article deals with an analysis of the properties of Norris gap derivatives. It discusses issues related to determining information from optical spectra measured with spectrometers. Impulse responses of differentiating filters were introduced using both Norris and Savitzky-Golay methods. The amplitude-frequency responses of the first and second order Norris differentiating filters were compared. The length impact of both segment and gaps on the frequency characteristics of filters was compared. The processing of exemplary gas spectra using the discussed technique was subsequently presented. The effect of first and second order derivatives on the spectra of carbon monoxide rotational lines for low resolution measurements is investigated. The Norris method of derivatives are very simple to implement and the calculation of their parameters does not require the use of advanced numerical methods.