Space-resolved measurement of transport processes at liquid-liquid interfaces using laser-induced fluorescence

Klaus Joeris; Thomas-Helmut Scheper

doi:10.1117/12.372871

21 December 1999 Space-resolved measurement of transport processes at liquid-liquid interfaces using laser-induced fluorescence

Klaus Joeris, Thomas-Helmut Scheper

Author Affiliations +

Proceedings Volume 3853, Environmental Monitoring and Remediation Technologies II; (1999) https://doi.org/10.1117/12.372871
Event: Photonics East '99, 1999, Boston, MA, United States

Abstract

Modeling of liquid-liquid-extraction processes involves the concentration of the extracted component directly at the interface. Currently, only very few and specialized methods are available for the direct measurement of these concentrations. Therefore a new, fluorescence based measurement system with a high spatial resolution and a broad application spectrum was developed and tested. The detection principle is based on the use of fluorescent dyes, excited by an argon ion laser. The intensity of the emitted light is dependent on the concentration of the extracted component in the very near surroundings of the dye. This intensity distribution is reproduced by an optical, microscope based system onto a highly sensitive camera with a spatial resolution of 1 micrometer. This distribution is converted into a concentration profile at the interface using a calibration function and digital image processing routines. Measurements were performed in a commonly used stirred two phase reactor modified to meet the requirements of an optical measurement system. It could be shown that the concentration profiles at mobile and immobile interfaces can be visualized with a resolution of 1 micrometer. The profiles formed at the interface differ significantly according to the kinetic of the used extraction system and the flow profiles in the reactor and can be used for further modeling of the extraction processes.

Citation Download Citation

Klaus Joeris and Thomas-Helmut Scheper "Space-resolved measurement of transport processes at liquid-liquid interfaces using laser-induced fluorescence", Proc. SPIE 3853, Environmental Monitoring and Remediation Technologies II, (21 December 1999); https://doi.org/10.1117/12.372871

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available