US 12,270,717 B2
Optical fiber pressure sensor and method of sensing thereof
Ahmad Riza Ghazali, Kuala Lumpur (MY); Mohamad Faizal Bin Abd Rahim, Kuala Lumpur (MY); Mohd Fahmi Azman, Kuala Lumpur (MY); Hairul Azhar Ab Rashid, Kuala Lumpur (MY); M Hafizal Md Zahir, Kuala Lumpur (MY); and Mohd Ridzuan Mokhtar, Kuala Lumpur (MY)
Assigned to PETROLIAM NASIONAL BERHAD (PETRONAS), Kuala Lumpur (MY)
Appl. No. 17/917,824
Filed by PETROLIAM NASIONAL BERHAD (PETRONAS), Kuala Lumpur (MY)
PCT Filed Apr. 8, 2021, PCT No. PCT/MY2021/050024
§ 371(c)(1), (2) Date Oct. 7, 2022,
PCT Pub. No. WO2021/206537, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 2020001820 (MY), filed on Apr. 8, 2020.
Prior Publication US 2023/0160765 A1, May 25, 2023
Int. Cl. G01L 1/24 (2006.01)
CPC G01L 1/242 (2013.01) 9 Claims
OG exemplary drawing
 
1. An optical fiber for measuring pressure comprising:
a core for guiding optical signals along a length of the core; and
a cladding layer including a plurality of stress applying parts disposed around the core;
characterized in that the plurality of stress applying parts are disposed within an orthogonal pair of holes provided parallel to and symmetrically around the core to induce intensified symmetric shear stress upon application of external pressure while preventing birefringence.