FIBRE-OPTIC SENSOR OF ELECTRIC FIELD INTENSITY Russian patent published in 2020 - IPC G01R29/12 

FIELD: optics.

SUBSTANCE: invention relates to fibre-optic sensors of voltage, current and temperature. Principle of operation is based on the property of a fibre Bragg grating (FBG) reflecting light radiation with wavelength depending on its deformation. Device comprises a section of optical fibre with two sensor sections with FBG, first of which measures temperature, and second, attached to electrostriction element along axis of its deformation, measures temperature and electric field intensity generated by two measuring electrodes and two electret plates arranged in parallel to electrodes. First electret plate and the first end of the electrostriction element are rigidly attached to the first edge of the coupling. Second electret plate is fixed on the opposite edge of the coupling, and in its hole the free end of the electrostriction element freely moves. As a result of exposure to electric field generated by electret plates installed opposite to each other with unlike poles, permanent hyperextension of second sensory section is realized, which shifts zero point of quadratic transformation characteristic to zone of high steepness.

EFFECT: technical result is increased sensitivity and accuracy of sensor.

1 cl, 2 dwg