Double-integrating-sphere system to measure the optical properties of turbid samples

Jaqueline R. S. Fernandes; Luismar B. Cruz Junior; Luciano Bachmann

doi:10.1117/12.2541748

20 February 2020 Double-integrating-sphere system to measure the optical properties of turbid samples

Jaqueline R. S. Fernandes, Luismar B. Cruz Junior, Luciano Bachmann

Proceedings Volume 11238, Optical Interactions with Tissue and Cells XXXI; 1123811 (2020) https://doi.org/10.1117/12.2541748
Event: SPIE BiOS, 2020, San Francisco, California, United States

Abstract

We have assembled a double-integrating-sphere system to measure the absorption (μ_a) and reduced scattering (μ'_s) coefficients of materials with high turbidity. We have employed the Inverse Adding-Doubling (IAD) algorithm to access these optical properties. The experimental system is a homemade setup assembled with broadband sources and 3D printed spheres, equipped with an optical fiber bundle for excitation and a spectrometer for detection. We have used a reference phantom (polyurethane plus Titanium Dioxide) with known optical properties at 633 nm (μ_a= 0.0019 mm^-1 and μ'_s= 0.477 mm^-1 ) to validate the system. The system can reliably measure the optical properties of turbid samples from 400 to 950 nm with one of the experimental setups and from 950 to 1650 nm with a second experimental setup.

Citation Download Citation

Jaqueline R. S. Fernandes, Luismar B. Cruz Junior, and Luciano Bachmann "Double-integrating-sphere system to measure the optical properties of turbid samples", Proc. SPIE 11238, Optical Interactions with Tissue and Cells XXXI, 1123811 (20 February 2020); https://doi.org/10.1117/12.2541748

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