G - Physics – 01 – N
Patent
G - Physics
01
N
340/143, 73/73
G01N 27/18 (2006.01) G01N 33/18 (2006.01)
Patent
CA 1087271
Abstract of the Disclosure Detecting different fluids, such as oil at the surface of water, by a heated monitoring element exposed for contact with the fluid, the element having a current flow characteristic that changes as a function of temperature, in preferred embodiments being the more filament of a light bulb. One system employs circuitry for periodically applying a pulse of electrical heating current to the monitoring element, to heat and produce a change in its electrical resistance, and output circuitry responsive to change in electrical resistance to indicate the nature of the fluid. Features of the invention include positioning the monitoring element at a liquid-air interface by a bouyant member, preferably with means to cause the element to transit the interface prior to a detection cycle; a driver supported on a housing, effective to move the element to produce this potion; circuitry for passing heating current through the monitoring element to clean its exposed surface of oil; and circuitry for limiting the electrical parameters of the cleaning current to prevent ignition of oil. Embodiments are shown having a reference element of temperature-variable resistance connected in circuit with the monitoring element so that, for the monitoring phase, a short pulse of electrical heating current passes through both elements simul- taneously and output circuitry responds to a differential change between the resistance of the monitoring and reference elements. In this system, the invention features the monitoring and reference elements connected in a bridge circuit; both elements a helical coils of tungsten wire; the reference element sealed with a reference liquid, preferably sealed in the class envelope of a light bulb. Pulsing the elements in various positions, in both immersed in liquid and alternately exposed to ?' (an example half-filled with liquid permits this operation for the reference element) and statistical evaluation of the output pulse by logic circuitry increase the accuracy of the output signal.
293390
Potter Bronson M.
Smart & Biggar
LandOfFree
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