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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
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.
0957-0233
1316-1323
Hodgkinson, Jane
ccb8c8c6-a374-4e1a-9997-83cc63531f58
Johnson, Mark
3d0db830-23aa-4083-9105-5f11707959df
Dakin, John P.
04891b9b-5fb5-4245-879e-9e7361adf904
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), 1316-1323. (doi:10.1088/0957-0233/9/8/026).

Record type: Article

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.

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Published date: 1998
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 77894
URI: https://eprints.soton.ac.uk/id/eprint/77894
ISSN: 0957-0233
PURE UUID: 864433e3-bda4-4b98-bae6-e526b51c6b66

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Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:28

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Contributors

Author: Jane Hodgkinson
Author: Mark Johnson
Author: John P. Dakin

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