G - Physics – 01 – R
Patent
G - Physics
01
R
340/106
G01R 31/08 (2006.01)
Patent
CA 1276253
ABSTRACT "EVENT LOCATION USING A LOCATING MEMBER CONTAINING DISCRETE IMPEDANCES" 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 a 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, three conduc- tors follow an elongate path. One of them (called the locating member) comprises a plurality of spaced-apart resistors separated by low resistance intermediate com- ponents, so that the locating member has known impe- dance characteristics along its length. The second conductor is connected to one end of the locating member, but is otherwise insulated from the locating member. When the event occurs, connection is made bet- ween the locating member and the second conductor at one or more of a plurality of available connection points, each of which lies between a pair of resistors. With the aid of the third conductor, a current of known size is passed through, and the voltage drop is measured between, the connection point and one end of the locating member. The location of the event can then be calculated.
478819
Fetherstonhaugh & Co.
Raychem Corporation
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