Performance of a photothermal detector with turbid liquids
Performance of a photothermal detector with turbid liquids
A closed-cell photothermal detector for aqueous analytes has been evaluated at 254 and 678 nm. We used a detector with a water meniscus as a pressure sensor, whose periodic deflection was measured using a low-finesse optical fiber Fabry-Perot interferometer. Performance was compared with a commercial diode array spectrometer and found to be similar for absorption measurements in nonturbid samples, but the results were affected up to 60 times less by scattered light. Finally the photothermal cell was converted into an integrating cavity using ceramic inserts, showing freedom from scattering-related errors at 678 nm but a degradation in performance at 254 nm.
atmospheric and ocean optics, water, instrumentation, measurement, metrology, detection, fabry-perot, interferometry, scattering, turbid media, spectroscopy, optoacoustic, thermo-optic
4360-4367
Hodgkinson, Jane
ccb8c8c6-a374-4e1a-9997-83cc63531f58
Johnson, Mark
3d0db830-23aa-4083-9105-5f11707959df
Dakin, John P.
04891b9b-5fb5-4245-879e-9e7361adf904
2005
Hodgkinson, Jane
ccb8c8c6-a374-4e1a-9997-83cc63531f58
Johnson, Mark
3d0db830-23aa-4083-9105-5f11707959df
Dakin, John P.
04891b9b-5fb5-4245-879e-9e7361adf904
Hodgkinson, Jane, Johnson, Mark and Dakin, John P.
(2005)
Performance of a photothermal detector with turbid liquids.
Applied Optics, 44 (20), .
(doi:10.1364/AO.44.004360).
Abstract
A closed-cell photothermal detector for aqueous analytes has been evaluated at 254 and 678 nm. We used a detector with a water meniscus as a pressure sensor, whose periodic deflection was measured using a low-finesse optical fiber Fabry-Perot interferometer. Performance was compared with a commercial diode array spectrometer and found to be similar for absorption measurements in nonturbid samples, but the results were affected up to 60 times less by scattered light. Finally the photothermal cell was converted into an integrating cavity using ceramic inserts, showing freedom from scattering-related errors at 678 nm but a degradation in performance at 254 nm.
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Published date: 2005
Keywords:
atmospheric and ocean optics, water, instrumentation, measurement, metrology, detection, fabry-perot, interferometry, scattering, turbid media, spectroscopy, optoacoustic, thermo-optic
Identifiers
Local EPrints ID: 21004
URI: http://eprints.soton.ac.uk/id/eprint/21004
ISSN: 0003-6935
PURE UUID: 441e9b9f-684a-44aa-86b0-602dafacaba1
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Date deposited: 07 Mar 2006
Last modified: 15 Mar 2024 06:27
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Contributors
Author:
Jane Hodgkinson
Author:
Mark Johnson
Author:
John P. Dakin
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