US 12,326,379 B2
Event detection device and event detection method
Ryota Takasu, Kanagawa (JP); and Taichi Murakami, Kanagawa (JP)
Assigned to ANRITSU CORPORATION, Kanagawa (JP)
Filed by ANRITSU CORPORATION, Kanagawa (JP)
Filed on May 25, 2023, as Appl. No. 18/323,516.
Claims priority of application No. 2022-096096 (JP), filed on Jun. 14, 2022.
Prior Publication US 2023/0400381 A1, Dec. 14, 2023
Int. Cl. G01M 11/00 (2006.01); H04B 10/071 (2013.01)
CPC G01M 11/3145 (2013.01) [H04B 10/071 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An event detection device comprising:
one or more processors collectively configured to:
acquire an OTDR waveform of an optical fiber to be measured;
perform a wavelet transform on the OTDR waveform and generates a scalogram with each wavelet coefficient as a feature quantity, wherein a scale value of the scalogram is increased by a factor of 21/2;
calculate a noise threshold value from the OTDR waveform, and extracts a peak from the feature quantity on the scalogram based on the noise threshold value to generate a peak graph; and
identify an event in the optical fiber to be measured from the peak graph.