公开(公告)号：US20250155276A1

公开(公告)日：2025-05-15

申请号：US18274016

申请日：2022-09-22

Applicant: KOREA PHOTONICS TECHNOLOGY INSTITUTE

Inventor： Myoung Jin KIM ,  Joo Young LEE ,  Young Ho KIM ,  Hui Oon KIM ,  Hyo Jong KIM ,  Hyo Young JUNG

IPC: G01H9/00 ,  G01D5/353

Abstract: The present invention relates to an optical fiber acoustic sensor with improved acoustic signal measurement sensitivity, and includes: a light source unit that generates and outputs pulsed light; an optical circulator that outputs the pulsed light output from the light source unit and input to an input terminal through an output terminal, and outputs light incident reversely from the output terminal through a detection terminal; a sensing optical fiber connected to the output terminal of the optical circulator and installed to extend over a measurement target region; at least one acoustic focusing member having the sensing optical fiber wound thereon multiple times, arranged in a measurement target region and adapted to focus an external acoustic signal; a light detection unit that detects Rayleigh scattered light scattered in the sensing optical fiber and traveling reversely; and a signal processing unit that control generation of the pulsed light by the light source unit and measures a vibration frequency and an intensity of acoustic received through the sensing optical fiber from a signal detected by the light detection unit, based on an output time point of the pulsed light.

公开(公告)号：US20250155267A1

公开(公告)日：2025-05-15

申请号：US18274048

申请日：2022-09-23

Applicant: KOREA PHOTONICS TECHNOLOGY INSTITUTE

Inventor： Myoung Jin KIM ,  Young Ho KIM ,  Joo Young LEE ,  Hyo Young JUNG ,  Hui Oon KIM ,  Hyo Jong KIM ,  Jun Gun SHIN

IPC: G01D5/353 ,  G01D5/34 ,  G01K11/322 ,  G01L1/24

Abstract: The present invention relates to a compressed sensing-based Brillouin frequency domain distributed optical fiber sensor device, and includes: a probe light generation unit that generates probe light using light output from a light source unit and transmits the probe light through one end of a sensing optical fiber; a compressed sensing light generation unit that generates compressed sensing light having a complex signal waveform, in which a plurality of different frequency signals are compressed, using the light output from the light source unit; an optical circulator that receives the compressed sensing light through an input terminal, transmits the same to an output terminal connected to the other end of the sensing optical fiber, and outputs, to a detection terminal, light scattered in the sensing optical fiber and incident through the output terminal; a light detection unit that detects Brillouin scattered light received through the detection terminal; a compressed sensing signal generation unit that generates a compressed sensing signal so that the compressed sensing light is generated; and a signal processing unit that controls the compressed sensing signal generation unit and calculates a temperature or strain for each position of the sensing optical fiber from a signal output from the light detection unit.