Fiberoptic systems and methods detecting EM signals via resistive heating
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United States of America Patent
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Mar 1, 2016
Grant Date -
Apr 10, 2014
app pub date -
Oct 10, 2012
filing date -
Oct 10, 2012
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Abstract
Fiberoptics can be employed to detect downhole electromagnetic signals via resistive heating. A disclosed electromagnetic energy detector embodiment includes an optically-interrogated temperature sensor; and a conductive element thermally coupled to the sensor, the conductive element having a temperature response to incident electromagnetic energy. The optically-interrogated temperature sensor may be a length or coil of optical fiber to which a distributed acoustic sensing (DAS) or distributed temperature sensing (DTS) system is attached. The conductive element may be a metal coating on the fiber that experiences resistive heating in response to electromagnetic energy and creates an optically-measurable thermal response in the sensor.
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