17 August 1994 Measurement of optical-transport coefficients of Intralipid in visible and NIR range
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Abstract
This article presents a modified method of measuring the optical-transport-coefficients of intralipid: the diffuse reflectance of intralipid with added-ink Rdink is measured by using an integrating sphere to calculate the scattering coefficient (mu) 's, the effective attenuation coefficient (mu) eff is measured by scanning the surface of pure intralipid suspension with a cut-end, high NA fiber-optic tip ((phi) 600micrometers , NA equals 0.48) in order to directly derive the absorption (mu) a of pure intralipid. In the same way, their wavelength dependencies between 0.48 - 0.85 micrometers are measured by utilizing Ar+, dye and Ti:Sapphire lasers. Experiments show that (mu) s((lambda) ) varies with (lambda) according to the previously reported Mie theory, (mu) 's((lambda) ) decreases with (lambda) while Rdink((lambda) ) is nearly invariant within the wavelength range; the scattering anisotropy g((lambda) ) tends to decrease linearly with (lambda) from 0.91 to 0.78; (mu) a((lambda) ) first decreases with (lambda) till (lambda) approximately equals 0.61 micrometers and then gradually increases with (lambda) . In the Rdink experiments, it has been found that when the port of the integrating sphere is lifted above the liquid surface, the dependence of the measured intensity with the height H can be well-fitted into an exponential relation for H <EQ 3 cm and Lorentzian relation for H <EQ 10 cm, so Rdink can be accurately derived by a simple extrapolation over a few measured points to H equals 0. Monte-Carlo simulation is applied to analyze the results.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yingtian Pan, Yingtian Pan, Ralf Engelhardt, Ralf Engelhardt, Juergen Rosperich-Palm, Juergen Rosperich-Palm, Gereon Huettmann, Gereon Huettmann, Reginald Birngruber, Reginald Birngruber, } "Measurement of optical-transport coefficients of Intralipid in visible and NIR range", Proc. SPIE 2134, Laser-Tissue Interaction V; and Ultraviolet Radiation Hazards, (17 August 1994); doi: 10.1117/12.182954; https://doi.org/10.1117/12.182954
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