Scientific Results

High-sensitivity detection of NO2 using a 740 nm semiconductor diode laser

Year: 1997

Authors: Gianfrani L., Gagliardi G., Pesce G., Sasso A.

Autors Affiliation: Dipartimento di Scienze Fisiche, Univ. di Napoli Federico II, INFM, Mostra d

Abstract: An AlGaAs diode laser was used to detect NO2 absorption lines belonging to the (000)-(2131) vibrational band, within the (X) over tilde(2) A(1) electronic ground state, at 739 nm. A simple absorption spectrometer based on wavelength-modulation spectroscopy with second-harmonic detection was developed. The minimum detectable pressure of pure NO2 was 0.1 mu bar with 2 m absorption path-length, corresponding to an absorbance of 10(-6). High-sensitivity detection of NO2 was also performed in the presence of N-2 and air at different total pressures: The effects on the detection limit of our apparatus were accurately investigated. The minimum NO2 concentration at 500 mbar of air was measured to be 2 ppm.

Journal/Review: APPLIED PHYSICS B-LASERS AND OPTICS

Volume: 64 (4)      Pages from: 487  to: 491

KeyWords: Nitrogen oxides; Pressure; Spectrometers; Spectroscopy, Absorption spectrometer; Electronic ground state; High sensitivity detection; Vibrational band; Wavelength modulation spectroscopy; Semiconductor lasers
DOI: 10.1007/s003400050204

Citations: 23
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-11-21
References taken from IsiWeb of Knowledge: (subscribers only)
Connecting to view paper tab on IsiWeb: Click here
Connecting to view citations from IsiWeb: Click here

gdpr-image
This site uses cookies. If you decide to continue browsing we consider that you accept their use. For more information about cookies and how to delete them please read our Info Policy on cookies use.
Read more