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Longitudinal resonant spectrophone for CO-laser photoacoustic spectroscopy

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Abstract

A photoacoustic (PA) system for monitoring gaseous air pollutants absorbing in the CO-laser range is presented. The characteristics of the CO laser and the interference caused by water-vapor absorption demand a special design of the PA cell and experimental setup. The optimum cell design was found by numerical simulation of the acoustic properties of various cell geometries. For this purpose a model using infinitesimal analogue acoustic impedances was developed. Based on a matrix formalism for fourterminals, a computer program was applied that permits the calculation of the frequency response of the PA signal amplitude at any position within a one-dimensional PA cell. Excellent agreement with experimental data is obtained. As a result, a new design for an acoustically resonant spectrophone with improved properties is presented. The response of the cell with aQ-factor of 52, operated at 555 Hz, is 2000 Pa cm/W.

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Authors and Affiliations

  1. Institute of Quantum Electronics, Physics Department, ETH, Hoenggerberg, CH-8093, Zürich, Switzerland

    S. Bernegger & M. W. Sigrist

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  1. S. Bernegger
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  2. M. W. Sigrist
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Bernegger, S., Sigrist, M.W. Longitudinal resonant spectrophone for CO-laser photoacoustic spectroscopy. Appl. Phys. B 44, 125–132 (1987). https://doi.org/10.1007/BF00694205

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  • DOI: https://doi.org/10.1007/BF00694205

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