Measurement of photoacoustic signals and noises in a sensitive spectrophone with a frequency-stabilized CO2 laser

Constantin A.D. Dutu; Simona M. Cristescu; Dan C. Dumitras

doi:10.1117/12.203562

8 March 1995 Measurement of photoacoustic signals and noises in a sensitive spectrophone with a frequency-stabilized CO₂ laser

Constantin A.D. Dutu, Simona M. Cristescu, Dan C. Dumitras

Author Affiliations +

Proceedings Volume 2461, ROMOPTO '94: Fourth Conference in Optics; (1995) https://doi.org/10.1117/12.203562
Event: ROMOPTO '94: 4th Conference on Optics, 1994, Bucharest, Romania

Abstract

An experimental system for the evaluation of photoacoustic (PA) signal characteristics and noises in a resonant photoacoustic cell excited in its first longitudinal mode by a line tunable and frequency stabilized CO₂ laser is presented. The excitation beam is modulated at a frequency that is coincident with one of the natural resonant acoustic frequencies of the cell. The PA signal detected by four microphones placed in the cell was measured by two methods, namely phase sensitive detection and computer assisted Fourier analysis. Experimental measurements in air, N₂, SF₆ and C₂H₄ at various pressures (

Citation Download Citation

Constantin A.D. Dutu, Simona M. Cristescu, and Dan C. Dumitras "Measurement of photoacoustic signals and noises in a sensitive spectrophone with a frequency-stabilized CO₂ laser", Proc. SPIE 2461, ROMOPTO '94: Fourth Conference in Optics, (8 March 1995); https://doi.org/10.1117/12.203562

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