Rotation and twist measurement using tilted fibre bragg gratings

Metrology and Measurement Systems

vol. 25

No 3

photonic sensors ; fibre Bragg gratings ; twist measurements ; rotation measurements

Nauki Techniczne

429-440

The paper presents a method of measuring the angle of rotation and twist using a tilted fibre Bragg grating

(TFBG) periodic structure with a tilt angle of 6◦, written into a single-mode optical fibre. It has been shown

that the rotation of the sensor by 180◦ causes a change in the transmission coefficient from 0.5 to 0.84 at

a wavelength of 1541.2 nm. As a result of measurements it was determined that the highest sensitivity can

be obtained for angles from 30◦ to 70◦ in relation to the basic orientation. The change in the transmission

spectrum occurs for cladding modes that change their intensity with the change in the polarization of light

propagating through the grating. The same structure can also be used to measure the twist angle. The

possibility of obtaining a TFBG twist by 200◦ over a length of 10 mm has been proved. This makes it

possible to monitor both the angle of rotation and the twist of an optical fibre with the fabricated TFBG.

Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation

2018.10.01

Artykuły / Articles

ISSN 0860-8229

10.24425/123893