Measuring and testing – Volume or rate of flow – Thermal type
Patent
1994-03-07
1994-12-27
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
053754662
ABSTRACT:
An apparatus for determining the flow rate of a flowing medium in the presence of pulsating flows and/or backflows, having a substrate as a carrier and a resistor arrangement located on the substrate for sensing medium flows. The resistor arrangement includes a temperature-sensitive resistor (R.sub.s), a heating resistor (R.sub.h), and compensation (R.sub.k) and bridge resistors (R.sub.1, R.sub.2, R.sub.3), which are arranged to create a feedback circuit that establishes a constant temperature environment, allowing electrical measurement of the flow mass. The substrate includes a fixed portion at one end, and two unfixed legs at the other end, the two legs divided by a notch. The width of each of the first leg and the notch is from 30 to 50 percent of the total width of the substrate, while the width of the second leg is at least 10 percent of the total width of the substrate. Such a relationship between the widths of the legs and notch avoids measuring discrepancies due to flow pulsations and/or backflows over the boundary surfaces of the sensing element.
REFERENCES:
patent: 4777820 (1988-10-01), Hecht et al.
patent: 4803875 (1989-02-01), Kuhn et al.
Goldstein Herbert
Robert & Bosch GmbH
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