Measuring transparency of gases, particularly the optical transmission of internal combustion engine exhaust gases

US3973123A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dietrich Adolph · Albershausen, DE
• Walter Dinkelacker · Stuttgart, DE

Key dates

• Filing date: May 21, 1975
• Grant date: Aug 3, 1976
• Expiry date: May 21, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B3/06
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To prevent contamination of confining surfaces of vessels through which a light beam is passed, the attenuation of which is a measure of the optical transparency of exhaust gases from Diesel engines, transparent disks, such as glass disks, are rotated adjacent the chamber and heated, for example by gas jets or an infrared source to such a temperature that the disk temperature is raised to a level sufficient to burn off any residual deposits left by the gases on the disks, so that the transparency of the disk will not be impaired and adulterate the measuring results.