| 摘要 |
A non-intrusive sensor for measuring mass flow of a medium flowing through a tube comprises: a probe having a predetermined length disposed along an external wall of the tube; a heater for heating the probe at a first point along the length thereof; a first temperature measuring device disposed at the first point for measuring a temperature of the probe and for generating a first signal T<SUB>h </SUB>representative thereof; a second temperature measuring device disposed at a second point along the length of the probe for measuring another temperature of the probe and for generating a second signal T<SUB>t </SUB>representative thereof; a third temperature measuring device disposed along the external wall of the tube a distance away from the probe for measuring an ambient temperature and for generating a signal T<SUB>a </SUB>representative thereof; and circuitry coupled to the first, second and third temperature measuring devices for generating a mass flow signal based on a ratio of temperature differential signals (T<SUB>h</SUB>-T<SUB>a</SUB>)/(T<SUB>t</SUB> -T<SUB>a</SUB>). A counterpart method is also disclosed.
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