Biomedical Engineering Reference
In-Depth Information
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Figure 10.12
Influence of the carrier gas on the binding of NH 3 to an optical fiber-based evanescent sensor
( Cao and Duan, 2005 ): (a) Air (b) N 2 (c) Ar. When only a solid line (--) is used then a single-fractal
analysis applies. When both a dashed (- - -) and a solid (--) line are used then the dashed line
represents a single-fractal analysis and the solid line represents a dual-fractal analysis.
Figure 10.12b shows the binding of 145 ppm NH 3 in nitrogen (carrier gas) to the optical
fiber-based evanescent ammonia sensor ( Cao and Duan, 2005 ). A dual-fractal analysis is
required to adequately describe the binding kinetics. The values of (a) the binding rate co-
efficient, k , and the fractal dimension, D f , for a single-fractal analysis, and (b) the binding rate
coefficients, k 1 and k 2 , and the fractal dimensions, D f1 and D f2 , for a dual-fractal analysis are
given in Table 10.9 . It is of interest to note that as the fractal dimension increases by a factor
of 2.51 from a value of D f1 equal to 0.9568 to D f2 equal to 2.40, the binding rate coefficient
increases by a factor of 2.40 from a value of k 1 equal to 24.885 to k 2 equal to 59.642.
Figure 10.12c shows the binding of 145 ppm NH 3 in Ar (carrier gas) to the optical fiber-
based evanescent ammonia sensor ( Cao and Duan, 2005 ). A dual-fractal analysis is required
to adequately describe the binding kinetics. The values of (a) the binding rate coefficient, k ,
and the fractal dimension, D f , for a single-fractal analysis, and (b) the binding rate
coefficients, k 1 and k 2 , and the fractal dimensions, D f1 and D f2 , for a dual-fractal analysis
are given in Table 10.9 . It is of interest to note that as the fractal dimension increases by a
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