Solids Fraction Measurement with a Reflective Fiber Optic Probe.

Yue, P. C. ; Ludlow, J. C. ; Shadel, L. J.

Technical Information Center Oak Ridge Tennessee

关键词: Fiber optics;    Reflection;    Intensity;    Particulates;    Light sources;   

RP-ID  :  DE2007912704

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

A method has been developed to extract solids fraction information from a reflective fiber optic probe. The commercially available reflective fiber optic probe was designed to measure axial particle velocity (both up and down directions). However, the reflected light intensity is related to particle size and particle concentration. A light reflection model is used to relate the reflected light intensity to solids fraction. In this model we assumed that the reflected light intensity is a fixed fraction, k1, of the total light intensity lost in penetration of a particle layer. Also, the solids fraction, (1-a), is related to particle concentration, N, in the light path by N = k2 (1- a), where a is the void fraction. The values of k1 and k2 are determined from measurements made in a packed bed condition. The method allowed rapid characterization of local velocity and unambiguous solids fraction requiring only simple calibration of reflection light intensity packed beds at to determine effective number of layers and particle specific scattering.