LIGHT FLUX CONVERSION METHOD AND FIBRE-OPTIC PRESSURE SENSOR REALIZING SAID LIGHT FLUX Russian patent published in 2021 - IPC G01L13/00 

FIELD: measurement.

SUBSTANCE: claimed group of inventions relates to measurement equipment and can be used to measure pressure in cavities of limited height by means of fibre-optic pressure sensor. Method of converting light flux in a fibre-optic pressure sensor comprises forming a light cone directed at a reflecting surface at the output of the supply optical fibre, light flux reflected from mirror surface is directed along discharge optical fibres to radiation receivers, where it is converted into electric signals. At that, the upper half of the cone is covered with an opaque shutter, the width of which exceeds the diameter of the core of the optical fibre d_c, which moves parallel to the common end of the optical fibres under the effect of the measured physical value by the value where is the aperture angle of the optical fibre, is the distance from the surface of the shutter to the mirror surface. At that, the upper part of the light flux, which varies in accordance with the law of change of the measured physical quantity, is transmitted along the upper discharge optical fibre to the first radiation receiver, lower invariable part of light flux along lower discharge optical fibre is supplied to the second radiation receiver. Fibre-optic pressure sensor comprises supply and discharge optical fibres, parallel to common end of which there moves is an opaque shutter fixed on membrane. On the other side of the shutter perpendicular to the optical axis of the optical fibers at a distance there fixed is a mirror surface, the thickness of shutter (0.5…) d_c, and the width of the shutter exceeds the core diameter d_c of the optical fibre. Movement of shutter is defined by expression wherein distance between common end of optical fibres and mirror surface is defined by expression where D is distance between optical axes of supply and discharge optical fibres.

EFFECT: technical result is implementation of compensation conversion of optical signals directly in the zone of perception of measurement information, higher sensitivity of converting optical signals, improved processability of the sensor design, reduced weight and size characteristics of the sensor, provision of the patient's health diagnostics with the help of the given device.

2 cl, 3 dwg