Neubrex Co., Ltd.

Che-Hsien Li

Kinzo Kishida

Kenichi Nishiguchi

Yoshiaki Yamauchi

Artur Guzik

Atsushi Makita

A distributed fiber optic acoustic detection device employs a novel distributed acoustic detection method using a phase noise cancelling distributed acoustic sensing (PNC-DAS) technique.

Distributed fiber optic acoustic detection device

A distributed optical fiber sound wave detection device is provided with an optical pulse emission unit that causes an optical pulse to be incident into the optical fiber, and a Rayleigh scattered light reception unit that receives Rayleigh scattered light produced inside the optical fiber. The optical pulse emission unit outputs the optical pulse that is modulated using a code sequence which has a predetermined length and by which the optical pulse is divided into a plurality of cells. The Rayleigh scattered light reception unit includes a phase variation derivation unit that performs demodulation corresponding to the modulation in the optical pulse emission unit on the Rayleigh scattered light and determines a phase variation thereof from the demodulated Rayleigh scattered light, and a sound wave detection unit that determines a sound wave that has struck the optical fiber from the phase variation determined by the phase variation derivation unit.

Distributed optical fiber sound wave detection device

The present invention provides a distributed optical fiber sensor capable of measuring the strain and temperature of an object to be measured simultaneously and independently with high spatial resolution. A distributed optical fiber sensor FS is a distributed optical fiber sensor which uses an optical fiberas a sensor, and a strain and temperature detectormeasures a Brillouin frequency shift amount caused by a strain and a temperature generated in the optical fiberby using a Brillouin scattering phenomenon, measures a Rayleigh frequency shift amount caused by the strain and temperature generated in the optical fiberby using a Rayleigh scattering phenomenon, and calculates the strain and temperature generated in the optical fiberfrom the measured Brillouin frequency shift amount and Rayleigh frequency shift amount.

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Kobe, Japan

Che-Hsien Li