US 12,405,157 B2
Optical fiber-based hydrophone
Niek Rijnveld, Amsterdam (NL); Peter Polyvas, Amsterdam (NL); Arun Gunda, Amsterdam (NL); Rudolf Kyselica, Amsterdam (NL); and Grzegorz Gruca, Amsterdam (NL)
Assigned to OPTICS11 B.V., Amsterdam (NL)
Appl. No. 18/289,808
Filed by OPTICS11 B.V., Amsterdam (NL)
PCT Filed May 9, 2022, PCT No. PCT/NL2022/050253
§ 371(c)(1), (2) Date Nov. 7, 2023,
PCT Pub. No. WO2022/240287, PCT Pub. Date Nov. 17, 2022.
Claims priority of application No. 2028176 (NL), filed on May 8, 2021.
Prior Publication US 2024/0288302 A1, Aug. 29, 2024
Int. Cl. G01H 9/00 (2006.01); G01D 5/353 (2006.01); G01V 1/18 (2006.01); G02B 6/02 (2006.01); H04R 1/44 (2006.01)
CPC G01H 9/004 (2013.01) [G01D 5/35303 (2013.01); G01V 1/188 (2013.01); H04R 1/44 (2013.01); G02B 6/0208 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A hydrophone comprising:
a mandrel comprising:
a shell;
a cylindrical cavity inwardly adjacent to the shell; and
a passage that provides fluid communication between the cylindrical cavity and an exterior environment surrounding the mandrel; and
an optical fiber comprising an optical sensing section that is at least partially wound on the mandrel, the optical sensing section having an optical characteristic that varies as a function of a radial dimension of the mandrel,
wherein the mandrel comprises a core of solid material having a bulk modulus lower than 0.1 GPa, the cylindrical cavity being comprised between the core and the shell.