US 12,292,315 B2
Brillouin distributed optical fiber sensor capable of measuring long measuring distance
Gukbeen Ryu, Seoul (KR); Wookjin Jeong, Seoul (KR); Sang Bae Lee, Seoul (KR); Wonsuk Lee, Seoul (KR); In Soo Kim, Seoul (KR); Jongbum Kim, Seoul (KR); and Kwan Il Lee, Seoul (KR)
Assigned to KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY, Seoul (KR)
Filed by KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY, Seoul (KR)
Filed on Nov. 24, 2021, as Appl. No. 17/534,454.
Claims priority of application No. 10-2020-0158550 (KR), filed on Nov. 24, 2020; and application No. 10-2021-0162559 (KR), filed on Nov. 23, 2021.
Prior Publication US 2022/0163355 A1, May 26, 2022
Int. Cl. G01D 5/353 (2006.01)
CPC G01D 5/35364 (2013.01) 16 Claims
OG exemplary drawing
 
1. A Brillouin distributed optical fiber sensor, comprising:
a first light source to output a first light having a modulated intensity at a preset frequency;
an optical modulation unit to generate Brillouin probe light and Brillouin pump light using the first light and apply the Brillouin probe light and the Brillouin pump light to one end and the other end of a test optical fiber, respectively;
a second light source to apply a second light with a frequency that is different from a frequency of the first light to the one end of the test optical fiber in a direction opposite to the Brillouin pump light; and
an optical detection unit to detect Brillouin scattered light generated by interaction between the Brillouin pump light and the Brillouin probe light in the test optical fiber.