G - Physics – 01 – R
Patent
G - Physics
01
R
73/69
G01R 31/08 (2006.01) G01D 5/16 (2006.01) G01M 3/18 (2006.01)
Patent
CA 1225256
ABSTRACT OF THE DISCLOSURE Method and apparatus for detecting and obtaining information about (particularly locating) an event, i.e. a change in a variable, for example an increase in the concentration of a fluid as the result of a leak, a change in the physical position of a movable member such as a valve, a change in temperature, or a change in pressure. In a preferred embodiment, two conductors follow an elongate path and are connected to each other at one end through a constant current source. In the absence of an event, the two conductors are electric- cally insulated from each other at all points along the path. When an event occurs, the two conductors become electrically connected at a connection point at which the event occurs, thus completing a circuit in which a current of known size then flows. The size of the current dots not depend on the resistance of the connection. One of the conductors is a locating member having known impedance characteristics along its length, and by measuring the voltage drop between the connection point and one end of the locating member the location of the event can be calculated.
457882
Masia Michael
Reed James P.
Fetherstonhaugh & Co.
Raychem Corporation
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