Pneumatic infrared radiation detector having a hermetically sealed chamber and a window

US4201915A · kind A · utility

Assignee

• Leybold-Hereaus GmbH & Co. KG · DE

Inventors

• Gunter Schunk · Bruchköbel, DE
• Albert Randow · Bruchköbel, DE

Key dates

• Filing date: May 2, 1978
• Grant date: May 6, 1980
• Expiry date: May 2, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/37
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A pneumatic infrared radiation detector for intermittent irradiation with infrared light has a hermetically sealed chamber including a metal cup having a highly reflective inner surface forming the back of the chamber and a flange-like rim at the open end thereof. A radiation admitting window is disposed at the open end of the cup and a flow detector is connected to the chamber. The cup comprises a thin-walled noble metal vessel comprising one of gold and silver and the window is composed of at least one of calcium fluoride and barium fluoride and sealed vacuum tight to the cup with glass solder having a coefficient of expansion of between 110 and 150. 10.sup.-7 /K.