Spectroscopy in heterogenous media and applications for bioprocess and environmental monitoring
Diffuse reflectance measurements and photon migration studies with near infrared (NIR) diode lasers were employed to elucidate experimental methods for determining absorption and scattering coefficients and species concentrations in heterogenous media. Measurements were performed at a number of wave...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2002-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X02000041 |
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| Summary: | Diffuse reflectance measurements and photon migration studies with near infrared (NIR) diode
lasers were employed to elucidate experimental methods for determining absorption and scattering coefficients
and species concentrations in heterogenous media. Measurements were performed at a number of
wavelengths utilizing several laser sources some of which were widely tunable. In order to establish the
applicability of simple photon migration models derived from radiation transport theory and to check the
experimental boundary conditions of our measurements, simple light scattering solutions (such as suspensions
of titanium dioxide, latex particles, and solutions of milk powder) containing dyes (such as nile blue,
isosulfan blue) were investigated. The results obtained from diffuse-reflectance studies at different sourcedetector
distances were in accordance with predictions from simple photon diffusion theory. Applications
of reflectance measurements for monitoring of cell growth during fermentation processes and for in-situ
investigations of soils are presented. |
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| ISSN: | 1110-662X |