This vertical scan macroscopic analyzer
consists of a reading head that moves along a flat-bottomed cylindrical
cell to scan the entire sample length. The reading head consists of a pulsed near infrared light source and two synchronous
detectors:
- The transmission detector monitors light
transmitted through the product;
- The backscattering detector
receives light backscattered by the product (135°).
The reading
head acquires transmission and backscattering data every 40 microns
along the sample tube for a
maximum length of 80 millimeters. This fingerprint of the product
characterizes
its homogeneity, particle concentration, and mean particle diameter.
Results are
represented on the software screen by a curve showing the percentage of
backscattered or transmitted light as a function of the sample tube length (in
mm).
The acquisition scan is then repeated over and over with a programmable frequency
and results are superimposed on a time scan graph. The stability or
instability of the product can then be determined by analyzing the time
graph. If the scans at different times overlap, the product is
stable.
