Apparatus and method for direct measurement of absorption and scattering coefficients in situ

USRE41682E1 · kind E1 · reissue

Assignee

• THE TEXAS A&M UNIVERSITY SYSTEM · US

Inventors

• Edward S. Fry · College Station, US
• George S. Kattawar · College Station, US
• Deric J. Gray · Nacogdoches, US
• Xianzhen Zhao · College Station, US
• Zheng Lu · Milpitas, US

Key dates

• Filing date: Jun 6, 2008
• Grant date: Sep 14, 2010
• Expiry date: Jun 6, 2028

Classification

• Technology area (CPC —): General

Abstract

An apparatus for measuring an absorption coefficient includes a first diffusive material, a second diffusive material inside the first diffusive material separated from the first diffusive material by a cavity, and a transparent material proximate to an inner surface of the second diffusive material that holds an absorptive material. First and second light detectors measure light intensities in the first and second diffusive materials cavity and the transparent material respectively. An absorption coefficient for the absorptive material may be determined based on the first and second light intensities measured when the cavity is illuminated by a light source.