Method and system to transmit signals being generated by a measuring sensor, and specifically a temperature sensor

US4848923A · kind A · utility

Assignee

• W. C. Heraeus GmbH · DE

Inventors

• Horst Ziegler · Berlin, DE
• Hermann Brendecke · Kleinostheim, DE
• Veit Hauptmann · Großkrotzenburg, DE

Key dates

• Filing date: Sep 29, 1987
• Grant date: Jul 18, 1989
• Expiry date: Sep 29, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D18/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Temperature measurement is effectively carried out by converting pulses derived from a pulse generator, in which the pulse gaps change as a result of a measured condition, for example temperature, by converting electrical pulses received from the pulse generator into light pulses, and then evaluating the light pulses with respect to a clock rate in a counter (22). The light pulses can readily be transmitted via a light pickup (9b) and fiber optic or the like (9a) to a remote evaluation unit. Preferably, the light is generated by a light emitting diode or a laser diode (8'), serially connected with a switching transistor (13') and energized upon receipt of a pulse from the pulse generator. The arrangement permits use of a piezoelectric element (2) such as a frequency determining quartz to control the frequency of an oscillator, the frequency of which is then converted into the pulses with the respective pulse gaps.