公开(公告)号：US20170153154A1

公开(公告)日：2017-06-01

申请号：US15323932

申请日：2014-07-04

Applicant: Hifi Engineering Inc.

Inventor： John Hull ,  Seyed Ehsan Jalilian

IPC: G01L1/24

Abstract: A device and system for detecting dynamic strain. The device comprises a longitudinally extending carrier and an optical fiber embedded along an outer surface of a length of the carrier. The optical fiber comprises at least one pair of fiber Bragg gratings (FBGs) tuned to reflect substantially identical wavelengths. The system comprises the device and an interrogator comprising a laser source and a photodetector. The interrogator is configured to perform interferometry by shining laser light along the optical fiber and detecting light reflected by the FBGs. The interrogator outputs dynamic strain measurements based on interferometry performed on the reflected light.

公开(公告)号：US20130167628A1

公开(公告)日：2013-07-04

申请号：US13682502

申请日：2012-11-20

Applicant: HiFi Engineering Inc.

Inventor： John Hull ,  Seyed Ehsan Jalilian

IPC: G01V1/00 ,  G06F17/00 ,  G01V8/10

CPC classification number: G01V1/001 ,  E21B47/101 ,  E21B47/1025 ,  E21B47/123 ,  G01V8/10 ,  G06F17/00

Abstract: The present disclosure is directed at methods, apparatuses, and techniques for detecting an acoustic event along a channel. Different wavelengths of an optical signal are multiplexed along a fiber optic strand extending along the channel. The strand has groups of transducers located along its length, and all of the transducers in any one of the groups reflect a tuned wavelength when not under strain. The wavelength that the transducers reflect changes in response to strain. Optical signal processing equipment receives reflected optical signals from the groups of transducers, and determines, for each of the groups of transducers, differences between wavelengths of the optical signals reflected by the transducers of that group and the tuned wavelength for that group. The differences correspond to the loudness of the event measured by that group of transducers, which can then be graphically represented to a person for analysis.

Abstract translation: 本公开涉及用于检测沿着信道的声学事件的方法，装置和技术。 光信号的不同波长沿沿着信道延伸的光纤链多路复用。 绞线具有沿其长度定位的换能器组，并且任何一个组中的所有换能器在不在应变下时反射调谐波长。 换能器反射的波长响应于应变而变化。 光信号处理设备从传感器组接收反射的光信号，并且为每组换能器确定由该组的换能器反射的光信号的波长与该组的调谐波长之间的差异。 差异对应于由该组换能器测量的事件的响度，其然后可以图形地表示给人以进行分析。