Measuring and testing – Volume or rate of flow – Thermal type
Patent
1989-12-05
1991-05-14
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
73198, G01F 168
Patent
active
050145525
ABSTRACT:
A flow sensor comprising a flow passage, a rectifying element such as a plurality of screens or a honeycomb structure or both, arranged in the flow passage, a flow passage reducer for reducing the flow passage behind the rectifying element, and a thermal flow sensor, such as for example a micro bridge sensor, mounted at a location immediately behind the reducer. The above structure can largely reduce disturbance in flow to thereby enable highly accurate measurements of a wide range of flow without a low pass filter.
REFERENCES:
patent: 3374673 (1968-03-01), Trageser
patent: 3645133 (1972-02-01), Simeth et al.
patent: 4224826 (1980-09-01), McLoughlin et al.
patent: 4280360 (1981-07-01), Kobayashi et al.
patent: 4412449 (1983-11-01), Eiermann et al.
patent: 4448070 (1984-05-01), Ohyama et al.
Aoshima Shigeru
Inaba Takashi
Kamiunten Shoji
Ochiai Kouichi
Tsumura Takashi
Goldstein Herbert
Yamatake-Honeywell Co. Ltd.
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