DIFFERENTIAL OPTIC FIBRE PRESSURE DIFFERENCE SENSOR Russian patent published in 2015 - IPC G01L11/02 

FIELD: measurement equipment.

SUBSTANCE: invention relates to control and measurement equipment and may be used in different fields of economy and first of all to measure pressure difference under conditions of impact of external destabilising factors on products of rocket and space equipment, NPP, oil and gas industry, etc. The device comprises a body, where metal membranes of plus and minus chambers are installed, having stiff centres connected to each other by means of a stem with a hole, coaxially with which input and output optic fibres of two measurement channels are arranged. Receiving ends of output optic fibres are located in the receiving end of the bundle of output fibres. At the same time the body is made of two parts, one end of which is designed for fixation on the object, in the inner cavity of bodies there is a newly introduced bearing part, in grooves of which membranes are fixed. Bodies of the plus and minus chambers and the bearing part are stiffly connected to each other, above this connection there is a ring installed, having a slot for installation of optic fibres in the central part of the bearing part and for fixation of the bushing with a bundle of optic fibres, one end of which follows the contour of the ring slot. The body, ring and bushing with bundles of fibres are rigidly and tightly connected to each other, and the stem is arranged with side grooves, inside of which there is a curtain, in the centre of which there is an opening arranged, besides, height of grooves is more or equal to height of the curtain.

EFFECT: increased accuracy of pressure measurement.

3 cl, 4 dwg