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Revista mexicana de física
versão impressa ISSN 0035-001X
Rev. mex. fis. vol.54 no.3 México Jun. 2008
Instrumentación
Absolute values of transport mean free path of light in nonabsorbing media using transmission and reflectance measurements
J. GalvanMiyoshi and R. Castillo*
Instituto de Física, Universidad Nacional Autónoma de México, P.O. Box20364, México, 01000 D.F.
* Author to whom correspondence should be addressed:
email: rolandoc@fisica.unam.mx
Recibido el 19 de febrero de 2008
Aceptado el 23 de abril de 2008
Abstract
We derived a relation between the transport mean free path of light, and transmittance and the reflectance in nonabsorbing turbid media. This allowed us to develop an experimental procedure to obtain absolute values for the transport mean free path of light just by measuring in an integrating sphere both the transmittance and the reflectance in this kind of system. We determined how accurate our method was by comparing our transport mean free path measurements with calculations made for colloidal suspensions of particles using Mie scattering theory and with measurements made in colloidal suspensions of polystyrene microspheres using diffusive wave spectroscopy. The agreement is excellent.
Keywords: Transport mean free path of light; DWS.
Resumen
En este trabajo se deriva una relación entre el camino libre medio de trasporte de la luz y la transmitancia y la reflectancia de un medio turbio no absorbente. Esto nos permitió desarrollar un procedimiento experimental para obtener valores absolutos de los caminos libres medio de transporte de la luz con solo medir, en una esfera integradora, la trasnmitancia y la reflectancia en esta clase de sistemas. Hemos determinado cuán preciso es nuestro método comparando nuestras medidas de camino libre medio de transporte con cálculos efectuados para suspensiones coloidales utilizando la teoría de dispersión de Mie y con medidas hechas en suspensiones coloidales de microesferas utilizando espectroscopia de onda difusa. El acuerdo es excelente.
Descriptores: Camino libre medio de trasporte de luz; DWS.
PACS: 82.70.Dd; 87.64Cc; 78.20.Ci
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