Effect of Fresnel reflection on time-resolved transmission measurements

Yukari Tanikawa-Takahashi; Yukio Yamada; Yasuo Hasegawa

doi:10.1117/12.200815

31 January 1995 Effect of Fresnel reflection on time-resolved transmission measurements

Yukari Tanikawa-Takahashi, Yukio Yamada, Yasuo Hasegawa

Proceedings Volume 2326, Photon Transport in Highly Scattering Tissue; (1995) https://doi.org/10.1117/12.200815
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

Abstract

Time-resolved spectroscopy in the near-infrared wavelength range is a promising technology for the development of optical tomography to measure the profiles of oxygenation state in living tissues. Many investigators have reported the experimental results of time-resolved reflectance and transmittance of ultra-short light pulses incident on tissue samples and phantoms. However, none of them has reported the effect of the boundary reflection which takes place at the interface between the sample and air because of the difference in the refractive indices. This paper describes the effect of the boundary reflection on the time- resolved transmittance through slabs of scattering and absorbing media simulating biological tissues. Time-resolved measurement was carried out by using a pulsed diode laser of 784 nm and an optical oscilloscope. The samples were latex microsphere suspension in water with or without the addition of ink. The cells containing the suspension were equipped with uncoated or anti-reflection coated glass windows to see the effect of the boundary reflection. The measured results were compared with the Monte Carlo simulation results which incorporated the boundary reflection. It has been found that the boundary reflection broadens the transmitted pulse width, and that the neglecting of the boundary reflection leads to an overestimation of the scattering coefficients.

Citation Download Citation

Yukari Tanikawa-Takahashi, Yukio Yamada, and Yasuo Hasegawa "Effect of Fresnel reflection on time-resolved transmission measurements", Proc. SPIE 2326, Photon Transport in Highly Scattering Tissue, (31 January 1995); https://doi.org/10.1117/12.200815

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