Measurement of optical-transport coefficients of Intralipid in visible and NIR range

Yingtian Pan; Ralf Engelhardt; Juergen Rosperich-Palm; Gereon Huettmann; Reginald Birngruber

doi:10.1117/12.182954

17 August 1994 Measurement of optical-transport coefficients of Intralipid in visible and NIR range

Yingtian Pan, Ralf Engelhardt, Juergen Rosperich-Palm, Gereon Huettmann, Reginald Birngruber

Proceedings Volume 2134, Laser-Tissue Interaction V; and Ultraviolet Radiation Hazards; (1994) https://doi.org/10.1117/12.182954
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

This article presents a modified method of measuring the optical-transport-coefficients of intralipid: the diffuse reflectance of intralipid with added-ink R_d^ink 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 R_d^ink((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 R_d^ink 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 R_d^ink 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.

Citation Download Citation

Yingtian Pan, Ralf Engelhardt, Juergen Rosperich-Palm, Gereon Huettmann, and 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); https://doi.org/10.1117/12.182954

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