Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Photothermal detection of trace optical absorption in water by use of visible-light-emitting diodes

Not Accessible

Your library or personal account may give you access

Abstract

Visible-light-emitting diodes of three different colors have been used to detect an absorbing compound (potassium permanganate) in trace quantities in aqueous solution. Photothermal absorption in a closed cell caused deflection of a water meniscus held at a small pinhole. The displacement was monitored with optical-fiber interferometry. The technique was limited by LED emission intensities and environmental acoustic noise, giving minimum detectable absorption coefficients of 2 × 10-4 cm-1 at 478 and 658 nm and 3 × 10-4 cm-1 at 524 nm. The magnitude and form of meniscus deflection signals were shown to be in good agreement with theory.

© 1998 Optical Society of America

Full Article  |  PDF Article
More Like This
Performance of a photothermal detector with turbid liquids

Jane Hodgkinson, Mark Johnson, and John P. Dakin
Appl. Opt. 44(20) 4360-4367 (2005)

Optical fiber photoacoustic–photothermal probe

P. C. Beard, F. Pérennès, E. Draguioti, and T. N. Mills
Opt. Lett. 23(15) 1235-1237 (1998)

Absorption spectrum (340–640 nm) of pure water. I. Photothermal measurements

Frank M. Sogandares and Edward S. Fry
Appl. Opt. 36(33) 8699-8709 (1997)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (2)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (8)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved