Sensor and method of measuring mass flow non-intrusively

Details Sensor and method of measuring mass flow non-intrusively Sensor and method of measuring mass flow non-intrusively

2005-04-26

2005-04-26

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

Reexamination Certificate

active

06883369

ABSTRACT:
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 Threpresentative 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 Ttrepresentative 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 Tarepresentative 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 (Th−Ta)/(Tt−Ta). A counterpart method is also disclosed.

REFERENCES:
patent: 4603580 (1986-08-01), Waring
patent: 4781057 (1988-11-01), Hyfantis et al.
patent: 4949578 (1990-08-01), Harpster
patent: 6487904 (2002-12-01), Myhre

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