Fluid sensor and method for providing same

US10830691B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Christoph Glacer · Munich, DE
• Alfons Dehe · Reutlingen, DE
• David Tumpold · Tauberbischofsheim, DE

Key dates

• Filing date: Apr 16, 2019
• Grant date: Nov 10, 2020
• Expiry date: Apr 16, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2291/02809
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A fluid sensor includes a housing and a thermal emitter in the housing to emit first thermal radiation into a detection volume of the housing at a first power level during a measurement interval and emit the first thermal radiation at a reduced first power level or not emit said first thermal radiation at all during an intermediate interval disposed outside of the measurement interval. The fluid sensor includes a measuring element in the detection volume to receive a radiation signal during the measurement interval. The fluid sensor includes a second thermal emitter in the housing to emit second thermal radiation at a second power level into the detection volume during the intermediate interval such that a thermal oscillation of thermal radiation in relation to an overall power level of the thermal radiation in the detection volume is at most ±50% during the measurement interval and the intermediate interval.