G - Physics – 01 – F
Patent
G - Physics
01
F
354/31, 73/74
G01F 1/68 (2006.01) G01F 1/684 (2006.01) G01F 1/696 (2006.01) G01P 5/12 (2006.01)
Patent
CA 2018272
A mass flowmeter for measuring the velocity of a fluid uses an active and a compensating sensor. The sensors generate heat when supplied with electrical power. A first heat sink is located a first gap from the first sensor in a direction substantially perpendicular to the direction of fluid flow. A second heat sink located a second gap from the second sensor in a direction substantially perpendicular to the direction of fluid flow. The dimension of the second gap is different from the dimension of the first gap. Electrical power supplied to the sensors causes a thermal flux to flow across the first gap from the first sensor to the first heat sink, and causes a thermal flux to flow from the second sensor across the second gap to the second heat sink. A measuring circuit computes the temperature rise of each of the sensors when supplied with power over the ambient temperature of the fluid. A computer divides the temperature rise of one of the sensors by the temperature rise of the other of the sensors to determine a ratio. The computer computes from that ratio and the power supplied to each of the sensors, the velocity of the fluid.
Mickler Brian E.
Smart & Biggar
LandOfFree
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