Patent No. EP3857177 (titled "Method And Device For Measuring A Flow Velocity Of A Gas Stream") was filed by Promecon Process Measurement Control on Sep 24, 2019. The application was issued on Sep 6, 2023.
A method and device for measuring gas flow rate that uses infrared radiation to detect concentration fluctuations in the gas stream. The device employs two IR sensors positioned transversely to the gas flow, with their measuring lines arranged to capture radiation from the gas stream. By analyzing the correlated fluctuations in IR radiation intensity between the two sensors, the flow rate of the gas stream can be accurately determined, even in high-temperature and chemically aggressive environments.

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