Photothermal detection of trace compounds in water using the deflection of a water meniscus
Photothermal detection of trace compounds in water using the deflection of a water meniscus
A novel photothermal detector is described, based on a closed cell suitable for use with low-frequency modulated continuous-wave light sources. Photothermal expansion in aqueous samples caused the deflection of a water meniscus held across a 200 µm radius pinhole. Displacement of the water meniscus was measured using fibre-optic interferometry. A mercury discharge lamp (254 nm) and a laser diode (678 nm) were used to detect absorption by 2 ppb anthracene and 0.5 ppm potassium permanganate in aqueous solutions, respectively. The technique was used to detect differences between absorption coefficients in aqueous solutions down to approximately 20% of the background absorption of the water itself.
1316-1323
Hodgkinson, Jane
ccb8c8c6-a374-4e1a-9997-83cc63531f58
Johnson, Mark
3d0db830-23aa-4083-9105-5f11707959df
Dakin, John P.
04891b9b-5fb5-4245-879e-9e7361adf904
1998
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.
(1998)
Photothermal detection of trace compounds in water using the deflection of a water meniscus.
Measurement Science and Technology, 9 (8), .
(doi:10.1088/0957-0233/9/8/026).
Abstract
A novel photothermal detector is described, based on a closed cell suitable for use with low-frequency modulated continuous-wave light sources. Photothermal expansion in aqueous samples caused the deflection of a water meniscus held across a 200 µm radius pinhole. Displacement of the water meniscus was measured using fibre-optic interferometry. A mercury discharge lamp (254 nm) and a laser diode (678 nm) were used to detect absorption by 2 ppb anthracene and 0.5 ppm potassium permanganate in aqueous solutions, respectively. The technique was used to detect differences between absorption coefficients in aqueous solutions down to approximately 20% of the background absorption of the water itself.
This record has no associated files available for download.
More information
Published date: 1998
Organisations:
Optoelectronics Research Centre
Identifiers
Local EPrints ID: 77894
URI: http://eprints.soton.ac.uk/id/eprint/77894
ISSN: 0957-0233
PURE UUID: 864433e3-bda4-4b98-bae6-e526b51c6b66
Catalogue record
Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 00:02
Export record
Altmetrics
Contributors
Author:
Jane Hodgkinson
Author:
Mark Johnson
Author:
John P. Dakin
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics