K-Patents PR-33-AC - Manual (Page 50)

44 PR-33-AC instruction manual
Document/Revision No. Rev. 1.02 Effective: June, 2014
B B C C A A
Low concentration High concentration
Figure 10.2 Optical images
The position of the shadow edge is measured digitally using a CCD element (Figure 10.3)
and is converted to a refractive index value n
D
by a processor inside the instrument.
This value is used together with the measured process temperature to calculate the
concentration.
a. Optical image
b. CCD element
c. CCD output
V
Figure 10.3 Optical image detection