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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Pignanelli, E. Kuhn, K. Schutze, A. |
| Copyright Year | 2011 |
| Description | Author affiliation: Laboratory for Measurement Technology, Department of Mechatronics, Saarland University, Saarbrücken, Germany (Pignanelli, E.; Kuhn, K.; Schutze, A.) |
| Abstract | Based on a low-cost, micromachined IR source with subsequent gas specific filter, photoacoustic spectroscopy (PAS) was investigated in a non-resonant operating mode of a gas chamber. In addition, non-dispersive infrared (NDIR) transmission measurements based on a thermopile detector were used to expand the measurement range, but also for monitoring purposes. Compared to many existing systems using expensive laser sources for stimulation of acoustic pressure waves in a resonant mode of operation, the approach is based on low-cost components. The IR source was modulated in the frequency range between 1 and 10 Hz. To achieve enhanced resolution and a good signal to noise ratio the sensor raw data - both for IR transmission as well as PAS - were evaluated using discrete Fourier transformation (DFT). By combining PAS and NDIR a wide concentration range is achieved, e.g. 50 to 20,000 ppm for CO for a measurement chamber with a length of 9 cm. Whereas the NDIR transmission measurement is suitable for monitoring higher concentrations, the PAS measurement is more sensitive to lower gas concentrations. Furthermore, the modular system allows the realization of a self-monitoring scheme at least for medium concentrations by comparing the signals measured with both approaches. |
| Starting Page | 813 |
| Ending Page | 816 |
| File Size | 779165 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781424492909 |
| ISSN | 19300395 |
| e-ISBN | 9781424492893 |
| DOI | 10.1109/ICSENS.2011.6127048 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-10-28 |
| Publisher Place | Ireland |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Discrete Fourier transforms Calibration Absorption Detectors Temperature measurement Frequency measurement Monitoring |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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