FIBRE-OPTIC DEVICE OF PRESSURE MEASUREMENT Russian patent published in 2014 - IPC G01L11/02 

FIELD: measurement equipment.

SUBSTANCE: device comprises wideband semiconductor light diodes, Y-shaped fibre-optic branches and Fabry-Perot cavities. One of Fabry-Perot cavities is designed for production of interference of light beams reflected from the surface of the membrane and the light guide end, under action of pressure and temperature of controlled medium at base distance between them. The second Fabry-Perot cavity is designed for production of interference of reflected light beams under temperature effect of the medium. The second fibre-optic outputs of branches are coupled with a recording unit, the photodetection ruler of which via the analogue-digital converter is connected to a processor of digital signals processing. Light guides of the first and second resonators are arranged in the body having two cavities, between which there is a membrane. One of cavities of the body communicates with the controlled medium and faces the central part of the membrane at the side opposite to its reflecting surface. In the other cavity of the body there are resonator light guides isolated from each other.

EFFECT: increased accuracy of measurements due to reduction of effect of temperature irregularity.

5 cl, 3 dwg