Heat radiation sensing device

US4770541A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Horst Fedter · Bühlertal, DE
• Werner Grunwald · Gerlingen, DE
• Peter Nolting · Bühl, DE
• Claudio De La Prieta · Stuttgart, DE
• Kurt Schmid · Ditzingen, DE

Key dates

• Filing date: Apr 14, 1987
• Grant date: Sep 13, 1988
• Expiry date: Apr 14, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J5/20
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A heat radiation sensing device is provided, which comprises two receiver surfaces which are exposed to the radiation, one of which comprises a high absorption ability with respect to the heat radiation by means of a black coloring, while the other has a low absorption ability by means of a covering which reflects the heat radiation. These two receiver surfaces consist of NTC resistor material and are combined to form a bridge circuit with two cermet resistors which are independent of temperature. The four resistors are applied to a ceramic substrate and are connected with conductor path which, in turn, end in the four required connections. The ceramic substrate is fixed in a frame which carries a covering which is pervious to heat radiation to a great degree and which, in turn, carries a layer having a window over one of the two NTC resistors the layer is made of a material which reflects the heat radiation to a great degree.