Method for thermal flow measurement with non constant...

Details Method for thermal flow measurement with non constant... Method for thermal flow measurement with non constant...

2006-08-15

2006-08-15

Thompson, Jewel V. (Department: 2855)

Measuring and testing

Volume or rate of flow

Reexamination Certificate

active

07089804

ABSTRACT:
The invention relates to a process and a device for thermal measuring the flow rate (v) of a fluid (3). In conventional thermal sensors the heating power P is supplied in the form of rectangular pulses. According to the invention, the sensor means (1b) are supplied by a heating control (2b) with non-constant heating pulses having a sublinear build-up dynamics P(t). Thereby, a nonlinear behaviour of the threshold value time (tS), until a threshold value temperature (Tm) is reached, as a function of the flow rate (v) can at least partially be compensated. Embodiments concern inter alia a build-up dynamics P(t) proportional to tmand/or to a time-independent amplitude factor (1+RS/RI)−1, wherein m is a Reynolds-number-dependent exponent and RS, RIare thermal transfer resistances. The advantages are an improved precision, a shorter measuring time and an enlarged measuring range for the flow rate v.

REFERENCES:
patent: 3719083 (1973-03-01), Morris et al.
patent: 3905230 (1975-09-01), Calvet et al.
patent: 4501145 (1985-02-01), Boegli et al.
patent: 0 180 974 (1986-05-01), None
patent: 0 698 786 (1996-02-01), None
Abstract of 02000767.0.
European Patent Office Search Report.
International Search Report and English Translation.

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