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Proceedings Paper

Photoacoustic spectrometer for ozone detection
Author(s): Edjar M. Telles; Edson Bezerra; Artemio Scalabrin
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Paper Abstract

A high-resolution external laser photoacoustic spectrometer has been developed. The spectrometer was used to analyze the absorption transitions of the ozone in coincidence with the CO2 laser emission and to evaluate its limit of sensitivity. A CO2 laser and a photoacoustic resonant cell, totally built in project, formed the spectrometer. The CO2 laser operates in 80 CW transitions distributed in the regular bands with power of up to 15W, tuned by a diffraction grating. The cell has frequency resonance of longitudinal mode close to 1600 Hz. The cell is equipped with two small electret microphones and ZnSe windows in Brewster angle. The quality factor of the cell was measured about 30 through the ozone absorption in resonance with the 9P14 line of CO2 laser. The spectrometer sensitivity limit was preliminary evaluated for ozone detection around 100 ppb.

Paper Details

Date Published: 14 August 2001
PDF: 5 pages
Proc. SPIE 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications, (14 August 2001); doi: 10.1117/12.437157
Show Author Affiliations
Edjar M. Telles, Unilaser Industria e Comercio Ltda (Brazil)
Edson Bezerra, Unilaser Industria e Comercio Ltda (Brazil)
Artemio Scalabrin, Univ. Estadual de Campinas (Brazil)


Published in SPIE Proceedings Vol. 4419:
4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications

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