Document Detail

Photothermal detection of trace optical absorption in water by use of visible-light-emitting diodes.
MedLine Citation:
PMID:  18301565     Owner:  NLM     Status:  In-Data-Review    
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 x 10(-4) cm(-1) at 478 and 658 nm and 3 x 10(-4) cm(-1) at 524 nm. The magnitude and form of meniscus deflection signals were shown to be in good agreement with theory.
J Hodgkinson; M Johnson; J P Dakin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  37     ISSN:  0003-6935     ISO Abbreviation:  Appl Opt     Publication Date:  1998 Nov 
Date Detail:
Created Date:  2008-02-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7320-6     Citation Subset:  -    
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