G - Physics – 01 – F
Patent
G - Physics
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G01F 1/66 (2006.01) G01F 1/708 (2006.01) G01F 1/712 (2006.01) G01P 5/00 (2006.01) G01P 5/22 (2006.01) G01P 5/24 (2006.01)
Patent
CA 2101652
Method and device of acoustic flow measurement for measuring the flow velocity of a gas and/or of quantities that can be derived from same. Acoustic signals are transmitted into a measurement pipe. The acoustic signals passing in the gas flow downstream and upstream are detected by means of two sound detectors placed in connection with the measurement pipe a.t a specified distance from one another, the flow velocity of the gas that flows in the measurement pipe being determined by making use of polarity correlation of said signals. The frequency of the sound that is transmitted into the measurement pipe is scanned between a certain minimum and a certain maximum frequency. The measurement signals arriving from the two sound detectors are passed to a narrow-band filter or system of filters. The passband of said filters is scanned synchronously with the frequency scanning of the sound transmission. The duration of the frequency scanning and the width of the passband of said filters are chosen so that, at the moment of the measurement sequence, the measurement signal detected by each sound detector has access through its filter substantially without attenuation, as well as so that the interference frequencies substantially different from the mean frequency of the filters are attenuated significantly.
Hiismaki Pekka
Kall Leif
Knuuttila Matti
Koukkari Sauli
Mayranen Tarmo
Instrumenttitehdas Kytola Oy
Marks & Clerk
LandOfFree
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