FIBRE-OPTIC PRESSURE SENSOR Russian patent published in 2024 - IPC G01L13/00 

FIELD: measuring.

SUBSTANCE: invention relates to measurement equipment and can be used for measurement of low pressure in cavities with limited height. Fibre-optic pressure sensor comprises a housing, a membrane, input and output optical fibres, parallel to the common end of which an opaque shutter moves, on the other side of the shutter, a mirror surface is fixed perpendicular to the optical axis of the optical fibres at a distance from the shutter. Mirror surface is formed on a fixed insert installed in the housing. Opaque shutter is made on the inner end of the flat protrusion of the newly introduced receiving element with two cylindrical protrusions which are variable in diameter, the outer diameter of the receiving surface of which is greater than the diameter of the membrane. In the centre of the membrane there is a hollow cylindrical protrusion, the base of which the membrane is sealed on the first protrusion of the receiving element, and the inner surface of the cylinder is on the second protrusion of the receiving element, wherein inner diameter and height of membrane cylindrical protrusion are equal to diameter and height of second protrusion of the receiving element. Membrane is tightly connected along the outer contour to the lower part of the housing. Base is installed in the upper part of the housing, which is tightly connected along the contour to the upper part of the housing.

EFFECT: device makes it possible to reduce errors of interaction of measuring instrument with object of measurement at minimum weight-overall dimensions and provides possibility of application in narrow spaces on objects with uneven surfaces.

8 cl, 3 dwg