Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Fast fourier transform analysis in cavity ring-down spectroscopy: application to an optical detector for atmospheric NO2

Mazurenka, M., Wada, R., Shillings, A.J. L., Butler, T.J. A., Beames, Joseph and Orr-Ewing, A. J. 2005. Fast fourier transform analysis in cavity ring-down spectroscopy: application to an optical detector for atmospheric NO2. Applied Physics B Lasers and Optics 81 (1) , pp. 135-141. 10.1007/s00340-005-1834-1

Full text not available from this repository.

Abstract

A fast Fourier transform (FFT) method for analysis of ring-down decays from a cavity ring-down (CRD) spectrometer has been tested and compared with alternative fitting methods. The ring-down times derived from the FFT method are obtained with a precision close to that of the Levenberg–Marquardt non-linear least-squares method, but the fitting algorithm is ~100 times faster, allowing real-time fitting of individual ring-down traces on a personal computer. Advantages of the FFT method are discussed, and the method is demonstrated for the measurement of NO2 partial pressures equivalent to mixing ratios of 150 pptv and above in laboratory air, using a CRD spectrometer based on an external cavity diode laser operating at wavelengths around 410 nm. The absorption by NO2 is distinguished from other cavity losses either by using synthetic (zero) air reference samples, or by diverting the sampled laboratory airflow through an NO2 chemical scrubber consisting of hydroxyapatite on a TiO2 substrate. Typical mixing ratios of NO2 in the laboratory air are ~25 ppbv.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Springer Verlag
ISSN: 0946-2171
Last Modified: 04 Jun 2017 08:06
URI: http://orca.cf.ac.uk/id/eprint/72870

Citation Data

Cited 53 times in Google Scholar. View in Google Scholar

Cited 42 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item