Two-input pyrometer

US3992943A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Peter Schiefer
• Heinz Bosebeck · Mettmann, DE

Key dates

• Filing date: Jan 30, 1975
• Grant date: Nov 23, 1976
• Expiry date: Jan 30, 1995

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J5/60
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Two photoelements with inputs for different wave lengths of radiation from a common source are serially connected individually to the inputs of high gain inverting amplifiers with feedback to adjust the voltage across the photoelement to zero, so that the outputs of the amplifiers are proportional to the short circuit currents through the photoelements. An algebraic calculating circuit forms the ratio of the outputs of the amplifier and provides for indication and/or control. The effectiveness of this ratio output is controlled in dependence upon proper orientation to the radiation emitting source.