DIGITAL FIBER-OPTICAL DISPLACEMENT SENSOR Russian patent published in 2018 - IPC G01D5/353 G02B6/34 

FIELD: measuring equipment.

SUBSTANCE: invention relates to fiber optic measurement technology and can be used to measure movement in explosive and harsh production and operation conditions. Device contains a multipolar coding magnetic ruler (MPCMR), coupled with a measurement object, and a reading module. Reading module contains reading elements, made on the basis of sections of optical fiber with several intra-fiber Bragg gratings (IBGs), tuned to different wavelengths and having a profiled magnetically sensitive coating or permanent magnets rigidly fixed to the boundaries of fiber sections with IBGs. When moving the MPCMR relative to the reading module, the deformation of local fiber sections with IBGs caused by the magnetic interaction occurs. This leads to a change in the wavelengths of the corresponding IBGs relative to the initial value. Number of reading elements, topological scheme of the fiber optic path and the amount of deformation of the local fiber sections with IBG are determined by the encoding method, the reading method, parameters of the MPCMR and the elements of the reader module. Variants of the design of MPCMR and the reader module are proposed, allowing to obtain digital incremental and absolute fiber-optic sensors of linear and angular movement without additional analog-to-digital conversion of optical signals in a remote optoelectronic unit.

EFFECT: technical result consists in expanding the technical capabilities by increasing the range of the displacement measurement, increasing the accuracy and stability of the measurement process, obtaining a digital movement code directly in the reader module.

3 cl, 6 dwg