Authors: Ghaleb, Khalil Abbas; Georges, Joseph

Source: Applied Spectroscopy, Volume 58, Issue 9, Pages 254A-280A and 1023-1140 (September 2004) , pp. 1116-1121(6)

Publisher: Society for Applied Spectroscopy

Abstract:

Crossed-beam thermal lens spectrometry is especially designed for the detection of very small samples in capillary tubes and more generally in microfluidic devices. In this work, the effect of the size of the excitation beam with respect to the size of the sample microchannel has been investigated. Although the signal is inversely proportional to the size of the excitation waist into the sample, the use of large waists may provide greater sensitivities when short-pulse excitation lasers are used and allows easier optimization of the optical design. On the contrary, the use of small beam waists reduces the edge effects that can arise depending on the nature and thickness of the walls of the sample holder. Moreover, small beams provide better spatial resolution and have allowed the measurement of flow velocities as low as 1 mm s^-1.

Keywords: CROSSED-BEAM THERMAL LENS; PULSED-LASER EXCITATION; DETECTION IN A MICROCHANNEL; SIZE OF THE EXCITATION BEAM

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702041959424

Affiliations: 1: Laboratoire des Sciences Analytiques, Bât. CPE-308D, Domaine Scientifique de la Doua, Université Claude Bernard, 69622 Villeurbanne Cedex, France

Publication date: 2004-09-01

More about this publication?

• The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge.
  
  Previously published as Bulletin (Society for Applied Spectroscopy)
• Editorial Board
• Information for Authors
• Submit a Paper
• Subscribe to this Title
• Membership Information
• Request copyrighted SAS materials
• Spectroscopic Nomenclature
• Focus Compendium
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: Analytical Chemistry
• By this author: Ghaleb, Khalil Abbas ;  Georges, Joseph

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers