Photometric method for determining courses of reactions

US4492462A · kind A · utility

Inventors

• Wilhelm Pross
• Jurgen Barry · Munich, DE
• Franz Muhlbock · Munich, DE
• Klaus Hartmann · Schriesheim, DE

Key dates

• Filing date: Feb 13, 1981
• Grant date: Jan 8, 1985
• Expiry date: Feb 13, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/51
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention provides a photometric method of determining courses of reaction in a specimen, in which method the intensities of the transmitted light and of the stray light are measured, wherein the two intensities are measured simultaneously and the electrical signals corresponding to the transmitted light and to the stray light are combined to form one signal. The invention makes it possible to perform reliable measurement even with low levels of transmitted and stray light. The method is preferably used in determining the coagulation times of blood. Apparatus for carrying out the method is also disclosed.