Miniaturized resonant photoacoustic cell of inclined geometry for trace-gas detection |
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Authors: | A V Gorelik A L Ulasevich F N Nikonovich M P Zakharich V A Firago N S Kazak V S Starovoitov |
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Institution: | 1. B.I. Stepanov Institute of Physics, NASB, Nezavisimosti ave. 68, 220072, Minsk, Belarus 2. Belarus State University, Nezavisimosti ave. 4, 220030, Minsk, Belarus
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Abstract: | A photoacoustic cell intended for laser detection of trace gases is represented. The cell is adapted so as to enhance the
gas-detection performance and, simultaneously, to reduce the cell size. The cell design provides an efficient cancellation
of the window background (a parasite response due to absorption of laser beam in the cell windows) and acoustic isolation
from the environment for an acoustic resonance of the cell. The useful photoacoustic response from a detected gas, window
background and noise are analyzed in demonstration experiments as functions of the modulation frequency for a prototype photoacoustic
cell with the internal volume ∼0.6 cm3. The minimal detectable absorption for the prototype is estimated to be ∼1.2×10−8 cm−1 W Hz−1/2. |
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