Principle

The knowledge of the extinction function is essential to the calculation of particle size distributions from ultrasonics extinction spectra measured with OPUS. The extinction function contains all parameters describing the interaction of the analysed suspension with ultrasonic waves. Since every solid material, when put in suspension, shows an individual chracteristic, an extinction function must be evaluated for every suspension system to be measured with OPUS (e.g. sand in water, salt in mother liquor).

The KSIGMA module is an easy-to-operate WINDOX component for the evaluation of extinction functions.

The calculation of an extinction function is a kind of calibration of the OPUS system for the material system to be analysed. For this purpose, the KSIGMA calculation fits the measured OPUS ultrasonics extinction spectra to corresponding particle size distributions. Such size distributions have to be provided from other measuring methods, e.g. laser diffraction or sieve analyses, once in the course of the calibration procedure.

Technical Specifications

sensors:	ultrasonics extinction sensors OPUS or NIMBUS
data handling:	comparison of ultrasonics extinction raw data to reference, preferably laser diffraction, results
operation:	option (add-on) of the OPUS sensor control program
evaluation:	semi-empirical calculation of the extinction function
diagrams:	extinction function diagram