Thermal time of flight signal guard

Details Thermal time of flight signal guard Thermal time of flight signal guard

1996-03-29

1997-12-16

Chilcot, Richard

Measuring and testing

Volume or rate of flow

By measuring transit time of tracer or tag

G01F 168

Patent

active

056987951

ABSTRACT:
The thermal time of flight signal guard overcomes the leakage crosstalk problem encountered in prior art systems by eliminating the leakage currents in the flow transducer before they reach the temperature sensors. This is accomplished by the installation of a conductive strip into the fluid flow path, interposed between the temperature sensors and the heat source. The conductive strip intercepts any errant leakage currents that are generated by the heat source and carried by moisture which accumulates on the walls of the fluid flow path to the temperature sensor. The signals that pass through the fluid flow conduit past the conductive strip to the temperature sensors are the thermal tracer signals. Therefore, the temperature sensors operate in a leakage current free environment and the signals produced by the temperature sensors are devoid of leakage current noise.

REFERENCES:
patent: 3922912 (1975-12-01), Bradbury et al.
patent: 5347876 (1994-09-01), Kang et al.
An Evaluation of the Heat Pulse Anemometer for Velocity Measurement in Inhomogenous Turdulent Flow, Ivar H. Tombach, The Review of Scientific Instruments, vol. 44, No. 2, pp. 141-148, Feb. 1973.
A Pulsed-Wire Technique for Velocity Measurements In Highly Turbulent Flows, L.J.S. Bradbury and I.P. Castro, J. Fluid Mech., vol. 49, part 4, pp. 657-691, 1971.

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