S F Baker et al 2004 Meas. Sci. Technol. 15 501 doi:10.1088/0957-0233/15/3/002
S F Baker1, J G Walker1 and K I Hopcraft2
Show affiliationsA new method for determining the optical absorption coefficient from scattering media is presented. The system measures the transmitted spatial intensity distribution from two samples of different thicknesses. The first moments of the distributions are calculated and used to determine the corresponding pair of optical coefficients. The system is robust to noise and does not require calibration. Error analysis shows that limiting factors are errors in assumed values of the anisotropy factor and refractive index of the medium. The system is tested experimentally on aqueous samples with added dye and polystyrene scattering spheres and is found to determine the absorption coefficient to an accuracy of 12–14%.
82.80.Yc Rutherford backscattering (RBS), and other methods of chemical analysis
42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy
Condensed matter: electrical, magnetic and optical
Instrumentation and measurement
Issue 3 (March 2004)
Received 4 November 2003, accepted for publication 22 December 2003, in final form 15 December 2003
Published 26 January 2004
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