Photoacoustic spectrometer for ozone detection

Edjar M. Telles; Edson Bezerra; Artemio Scalabrin

doi:10.1117/12.437157

14 August 2001 Photoacoustic spectrometer for ozone detection

Edjar M. Telles, Edson Bezerra, Artemio Scalabrin

Proceedings Volume 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications; (2001) https://doi.org/10.1117/12.437157
Event: IV Iberoamerican Meeting of Optics and the VII Latin American Meeting of Optics, Lasers and Their Applications, 2001, Tandil, Argentina

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.

Citation Download Citation

Edjar M. Telles, Edson Bezerra, and Artemio Scalabrin "Photoacoustic spectrometer for ozone detection", Proc. SPIE 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications, (14 August 2001); https://doi.org/10.1117/12.437157

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