Method and apparatus for Raman correlation spectroscopy

US5949532A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Schrof · Neuleiningen, DE
• Jurgen Klingler · Mutterstadt, DE
• Dieter Horn · Heidelberg, DE

Key dates

• Filing date: Jul 28, 1997
• Grant date: Sep 7, 1999
• Expiry date: Jul 28, 2017

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J2003/2866
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and an apparatus for determining diffusion parameters, concentration, size or flow behavior of particles in a sample, exciting light of a light source being directed into the sample, Raman scattered light being collected from an observed volume of the sample and being passed on to a spectrograph where it is resolved into spectral lines, the intensity of at least one spectral line being measured at least 10 times per second by means of one photodetector each, and the measured intensity values for the respective spectral line being used, via a fluctuation analysis, preferably an autocorrelation or a frequency analysis, to calculate diffusion parameters, concentration, size or flow behavior of the particle to which the spectral line in question can be assigned. With this method, it is also possible for signals of different spectral lines or bands, or signals of Raman scattered light, quasi-elastically scattered light and fluorescence light to be correlated with one another.