Patent ID: 7266261

Claim:
A fiber optics differential pressure transducer to measure the differential pressure generated by a Venturi type device in oil wells, characterized by comprising: a) a main body ( 110 ) provided with: a hollow hole ( 113 ); on a symmetrical manner to said hole ( 113 ), a depression ( 112 ) on both sides of said body ( 110 ), the depression ( 112 ) being provided in the middle of a diaphragm ( 2 ) to be attached to at least one FBG, said body ( 110 ) being connected to: b) a cap ( 115 ), provided with a depression ( 117 ) with matching ends and of the same dimension as the hollow hole ( 113 ) and the depression ( 112 ), and a groove ( 116 ) to: i) house the mechanical seal for sealing the upper portion of said transducer and ii) communicate said hollow hole ( 113 ) to one of the surfaces of the diaphragm ( 2 ) submitted to the action of pressure, the other surface of the diaphragm ( 2 ) being in contact with a pressure outlet, the body ( 110 ) and the cap ( 115 ) being assembled and attached to a mandrel from a pipe with the help of attachment devices through the orifices ( 120 ), and where: the optical fiber ( 118 ) containing at least one FBG ( 118 a ) runs through the holes ( 111 a , 111 b ) in the body of the transducer in such a manner that said FBG is exactly over the central part of the surfaces of the diaphragm ( 2 ), the route of the fiber comprising the entry through a hole ( 111 a / 111 b ) in one of the sides of the body ( 110 ) of the transducer, passes through the diaphragm ( 2 ), follows on until the hollow hole ( 113 ), circles said hole in a spiral made in the walls of the body ( 110 ); and enters the body ( 110 ) once again in the direction of the other surface of the diaphragm ( 2 ) and finally leave the body ( 110 ), to be connected to another transducer or to the measuring system.