公开(公告)号：CA2368956A1

公开(公告)日：2002-07-22

申请号：CA2368956

申请日：2002-01-22

Applicant: UNISEARCH ASSOCIATES INC

Inventor： MACKAY G I ,  SCHIFF H I ,  GAMBLE H A ,  ROBBINS J C

IPC: G01J3/44 ,  G01N21/05 ,  G01N21/63 ,  G01N21/65

Abstract: The present invention relates to a method and apparatus for detecting transitions between different gas or liquid products in a flow pat h and, more particularly, it relates to an apparatus and method utilizing Rama n spectroscopy for detecting transitions between petroleum products. A Raman spectrometer is preferably to produce a monochromatic excitation beam at a wavelength of approximately 670 nm. The spectrometer consists of an entrance slit, a combined diffraction grating/focussing element, and an exit slit. The Raman signal, which exits the spectrometer exit slit is detected b y a highly sensitive photomultiplier tube, and sent to a computer device for dat a acquisition and analysis. The proposed invention detects liquid or gas products in a flow path by detecting the changes in the composition of vario us petroleum products flowing through a gasoline pipeline, by means of exposing samples of various petroleum products to the Raman spectrometer system.