Patent ID: 11946799
Assignee: SHANGHAI INSTITUTE OF OPTICS AND FINE MECHANICS, CHINESE ACADEMY OF SCIENCES
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A distributed fiber-optic acoustic sensing system, comprising
a distributed fiber-optic acoustic sensor comprising a plurality of sensing units along an axial direction, wherein the distributed fiber-optic acoustic sensor comprises
a distributed fiber-optic sensor based on a sweep frequency pulse and a pulse compression technology,
an optical frequency domain reflectometer, and
one or more of phase-sensitive optical time-domain reflectometers based on an ultra-narrow pulse or coherent detection, and

a sensing optical fiber,
wherein the distributed fiber-optic acoustic sensor is connected to the sensing optical fiber and is used for emitting a detection light pulse to the sensing optical fiber, collecting and demodulating sound fields of signal sources sensed along the sensing optical fiber;
a total number of the sensing units in the axial direction of the distributed fiber-optic acoustic sensor is L, the sensing units are divided into M subunits in the axial direction, and the number of the sensing units in each subunit is N, L=M×N, and the sensing units in each subunit are used for spatially coherent combination of sound field signals obtained by detection; and
spatial resolution of the distributed fiber-optic acoustic sensor is centimeter-level or higher.