| 摘要 |
A mass flow sensor is disclosed comprising: a heated probe having a predetermined length for disposition in the path of mass flow; at least two first temperature measuring devices disposed at different points along the probe length for measuring temperatures of the heated probe at such points in the presence of the mass flow; a second temperature measuring device for disposition in the path of mass flow for measuring the temperature of the mass flow; and a processing unit for determining mass flow as a function of the temperature measurements of the first and second temperature measuring devices. A method of measuring mass flow is also disclosed comprising the steps of: disposing a probe of a predetermined length in the path of mass flow; heating the probe; measuring the heated probe temperature at at least two different points along its length in the presence of the mass flow; measuring the temperature of the mass flow; and determining mass flow as a function of the temperature measurements of the heated probe and mass flow. In one embodiment, the mass flow sensor includes at least three temperature measuring devices disposed in proximity to at least one probe for generating signals representative of the temperature of the heated probe along its length and the temperature of the mass flow. The at three temperature measuring devices are coupled together to generate at least two signals representative of temperature differentials in the vicinity of the at least one probe, and the processing unit processes at least one of the temperature differential signals to generate a signal representative of mass flow.
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