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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 20 — Jul. 10, 2005
  • pp: 4360–4367

Performance of a photothermal detector with turbid liquids

Jane Hodgkinson, Mark Johnson, and John P. Dakin  »View Author Affiliations


Applied Optics, Vol. 44, Issue 20, pp. 4360-4367 (2005)
http://dx.doi.org/10.1364/AO.44.004360


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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.

© 2005 Optical Society of America

OCIS Codes
(010.7340) Atmospheric and oceanic optics : Water
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(290.7050) Scattering : Turbid media
(300.6430) Spectroscopy : Spectroscopy, photothermal

Citation
Jane Hodgkinson, Mark Johnson, and John P. Dakin, "Performance of a photothermal detector with turbid liquids," Appl. Opt. 44, 4360-4367 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-20-4360

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