SIGNAL PROCESSING METHOD FOR PHASE OTDR

WIPO Patent Application WO/2024/057462

A1

The purpose of the present disclosure is to be able to perform streaming processing of data, and prevent deterioration of the S/N ratio and vibration measurement accuracy without increasing memory size requirements for a computer, even during measurements over a long-time.　The signal processing device and signal processing method of the present disclosure are a signal processing device and a signal processing method that perform signal processing of measurement data of scattered light obtained by using an optical fiber to scatter a plurality of optical pulses with different optical frequencies, wherein the scattered light vector ri of scattered light at each optical frequency is calculated in a prescribed time range in which any point on the optical fiber can be measured, the scattered light vectors ri of the optical frequencies are averaged in the time range, the rotation angle αi for correcting the phase of each optical frequency is calculated using the time average vector ri_avet obtained by the averaging, and the phase of the scattered light vector ri of each optical frequency is rotated by the rotation angle αi, thereby the phase of the scattered light vector ri of each optical frequency is corrected.

WAKISAKA YOSHIFUMI (JP)
TAKAHASHI HIROSHI (JP)
IIDA DAISUKE (JP)
KOSHIKIYA YUSUKE (JP)

PCT/JP2022/034477

March 21, 2024

September 14, 2022

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NIPPON TELEGRAPH & TELEPHONE (JP)

G01D5/353

JP2020169904A	2020-10-15
US20200370949A1	2020-11-26
US20220120608A1	2022-04-21

OKADA, Kenji et al. (JP)

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