Radiometer

US4332168A · kind A · utility

Assignee

• ELTRO GmbH · DE

Inventors

• Claus Aberle · Mannheim, DE
• James Ruger · Hoffenheim, DE
• Klaus-Peter Schulz · Heidelberg, DE

Key dates

• Filing date: Apr 16, 1980
• Grant date: Jun 1, 1982
• Expiry date: Apr 16, 2000

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J5/0893
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A radiometer has a concave mirror turnable about its optical axis and photoelectric converters which receive light waves reflected by the mirror and are mechanically coupled with the same. An interrupter disk is arranged in the path of the radiation which falls onto the mirror and has a side facing the mirror which is reflective. The converters are heated and a housing surrounds the mirror, the converters and the heater and is provided with a window located on the optical axis and permitting the admission of light to the mirror. An electronic circuit processes the various signals of the device. According to the invention the light-admitting window is arranged in the center of curvature of the hollow part-spherical mirror, which center of curvature is located behind or inwardly of the interrupter disk as seen in the direction of the incoming light. An arrangement is provided for producing a reference signal which is phase-locked with the rotation of the interrupter disk and a rectifier circuit of the electronic circuitry has a phase detector arrangement which is controlled by this reference signal.