US 11,835,406 B2
Optical fiber sensing device having a symmetric optical fiber arrangement
Marinus Jacobus Van Der Hoek, Rotterdam (NL)
Assigned to Compass Photonics B.V., Rotterdam (NL)
Appl. No. 17/293,338
Filed by Compass Photonics B.V., Rotterdam (NL)
PCT Filed Nov. 12, 2019, PCT No. PCT/NL2019/050736
§ 371(c)(1), (2) Date May 12, 2021,
PCT Pub. No. WO2020/101484, PCT Pub. Date May 22, 2020.
Claims priority of application No. 2021989 (NL), filed on Nov. 13, 2018.
Prior Publication US 2022/0011180 A1, Jan. 13, 2022
Int. Cl. G02B 6/36 (2006.01); G01L 1/24 (2006.01)
CPC G01L 1/242 (2013.01) [G02B 6/3616 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An optical fiber sensing device, comprising:
a base,
an actuator connected to the base and having an actuator axis (X),
an elastic hinge connecting the actuator to the base, wherein the elastic hinge allows the actuator to move or deflect in a movement plane (D) with respect to the base from an unmoved state to a moved state,
a pair of optical fiber portions extending in the movement plane, the pair of optical fiber portions contacting the actuator in multiple contacting positions, wherein the pair of optical fiber portions are pre-strained and the optical fiber portions (4) comprise light modulation structures, wherein
in the unmoved state the actuator comprises a symmetry plane (S) perpendicular to the movement plane (D), wherein the pair of optical fiber portions are symmetrically arranged with respect to the symmetry plane, such that the movement or deflection of the actuator causes a change in strain in one of the optical fiber portions and a proportional or equal change in strain of opposite sign in the other optical fiber portion.