(569c) Solids Fraction Measurement with a Reflective Fiber Optic Probe
AIChE Annual Meeting
2006
2006 Annual Meeting
Particle Technology Forum
Transport in Fluidized Systems
Thursday, November 16, 2006 - 1:10pm to 1:30pm
Title: Solids Fraction Measurement with a
Reflective Fiber Optic Probe
Abstract. 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 measured 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 assume that the reflected light
intensity is a fixed fraction, K1, of the total light intensity lost
in penetration of a solid layer. Also, the solids fraction is related to
particle concentration, N, in the light path, by N = K2 (1- ε),
where (1-ε) is the solids fraction. The parameters K1 and K2 are determined through a calibration and curve fitting procedure. This paper
describes this procedure and the steps taken to derive the values of K1
and K2. It is proposed that the reflective fiber optic can be used
for real time measurement of solids fraction in a circulating fluid bed.
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