Patent ID: 8280202

Claim:
A fiber-optic dynamic sensing module, comprising: a support member for mounting the fiber-optic dynamic sensing module to a machine; a beam extending from the support member; and a pre-strained fiber Bragg grating sensor and a strain-free fiber Bragg grating sensor mounted on the beam, the pre-strained and strain-free fiber Bragg grating sensors each comprising a Bragg grating inscribed in a fiber, the Bragg grating of the pre-strained fiber Bragg grating sensor being packaged more tightly along a longitudinal direction of the beam than the Bragg grating of the strain-free fiber Bragg grating sensor; wherein the beam comprises a mounting end secured to the support member and a cantilevered free arm extending from the mounting end in a direction away from the support member, wherein the pre-strained fiber Bragg grating sensor is mounted on the beam in a region closer to the mounting end than the strain-free fiber Bragg grating sensor.