| Numéro |
J. Phys. IV France
Volume 04, Numéro C7, Juillet 1994
8th International Topical Meeting on Photoacoustic and Photothermal Phenomena8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique |
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|---|---|---|
| Page(s) | C7-63 - C7-66 | |
| DOI | https://doi.org/10.1051/jp4:1994716 | |
8th International Topical Meeting on Photoacoustic and Photothermal Phenomena
8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-63-C7-66
DOI: 10.1051/jp4:1994716
1 Inst. Isotopic and Molec. Technol., P.O. Box 700, 3400 Cluj 5, Romania
2 Ruhr-Univ., Inst. Exper. Phys. III, AG Solid State Spectrosc., 44780 Bochum, Germany
3 Inst. Isotopes, P.O. Box 77, 1525 Budapest, Hungary
4 Laser Photoacoustic Lab., Agric. Univ., Bomenweg 4, 6703 HD Wageningen, The Netherlands
© EDP Sciences 1994
8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-63-C7-66
DOI: 10.1051/jp4:1994716
Position modulated tangential photopyroelectric (PPE) spectrometry for low absorptions in liquids
M. Chirtoc1, 2, Z. Bozoki3, D. Bicanic4 and J. Gibkes21 Inst. Isotopic and Molec. Technol., P.O. Box 700, 3400 Cluj 5, Romania
2 Ruhr-Univ., Inst. Exper. Phys. III, AG Solid State Spectrosc., 44780 Bochum, Germany
3 Inst. Isotopes, P.O. Box 77, 1525 Budapest, Hungary
4 Laser Photoacoustic Lab., Agric. Univ., Bomenweg 4, 6703 HD Wageningen, The Netherlands
Abstract
A novel tangential photopyroelectric (PPE) cell for liquids is described in which the excitation laser beam is position-modulated. As a result, only the thermal wave is modulated and the background signal due to scattered light is suppressed by more than 50 times. The application for water pollution monitoring shows a detection limit of 1 mmol/m3 ammonium ion in water.
© EDP Sciences 1994