Novel design of a resonant photoacoustic spectrophone for elemental carbon mass monitoring
- 6 March 1995
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 66 (10) , 1285-1287
- https://doi.org/10.1063/1.113271
Abstract
An improved design of a resonant photoacoustic spectrophone is reported for aerosol absorption measurements by using a near‐infrared laser diode (λ=802 nm; P=450 mW) in combination with a double‐pass configuration for excitation of azimuthal modes and right‐angle mounting of two electret microphones for signal detection. As a result of the new spectrophone setup a small‐sized portable sensor system for real‐time in situ elemental carbon monitoring is presented. The detection limit is estimated to 4.5×10−8 cm−1 or 1.5 μg elemental carbon per m 3.Keywords
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