Patent ID: 11953385
Assignee: HIFI ENGINEERING INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. An event detection system comprising:
a conduit;
optical fiber positioned alongside the conduit;
an interrogator optically coupled to the optical fiber and configured to interrogate the optical fiber by sending one or more light pulses along the optical fiber and receiving reflections of the one or more light pulses;
an event verification device comprising an enclosure through which passes the optical fiber, wherein the event verification device is configured to generate one or more interference signals for interfering with the optical fiber within the enclosure such that an optical path length of the optical fiber is altered; and
an optical circulator optically coupled to the optical fiber and comprising first, second, and third ports configured such that light entering the first port via a first portion of the optical fiber is sent out of the second port toward the event verification device via a second portion of the optical fiber, and light entering the second port from the event verification device via a third portion of the optical fiber is sent out of the third port via a fourth portion of the optical fiber.