Patent ID: 7342217

Claim:
A system for the measurement and surface data acquisition for optical fiber sensors containing fiber Bragg gratings for the sensing of physical quantities originated in one oil and/or gas well or in a set of oil and/or gas wells, wherein said system comprises: an optical system ( 30 ) with an optical source ( 31 ) connected to a modulator ( 32 ) for conveying light through a coupler ( 33 a ) and an optical switcher ( 20 ) to sensors ( 10 a , 10 b ) for sensing physical parameters in the oil and/or gas wells, signals originating from sensors ( 10 a , 10 b ) being directed to an electronic module ( 40 ), where they are processed and converted into electrical signals through detectors ( 36 a , 36 b , 36 c , 36 d ) that optimize the noise/signal ratio, the system being constructed and arranged for: a) transmitting the optical signal generated by source ( 31 ) to one of the arms of an optical coupler ( 33 a ) and conveying said signal to sensors ( 10 a , 10 b ), the return of the optical signal of the two sensors ( 10 a , 10 b ) crossing a couple ( 33 b ) that divides the signal into two outputs, (Output 1 ) and (Output 2 ); b) directing the optical signal of the first output (Output 1 ) to a further coupler ( 33 c ), said signal being divided in two further outputs: channel 1 power reference signal (Ref Power 1 ) and channel 1 sensor reference signal (RefSens 1 ); c) in a way analogous to that of b), also directing the optical signal of the second output (Output 2 ) to a further coupler ( 33 d ), and dividing said signal in two further outputs; channel 2 power reference signal (RefPower 2 ) and channel 2 sensor reference signal (RefSens 2 ); d) conveying channel 1 power reference signal (RefPower 1 ) to a detector ( 36 a ) through a fixed 10 dB attenuator ( 34 a ); e) conveying in a way analogous to d), channel 2 power reference signal (RefPower 2 ) to a detector ( 36 b ) through a fixed 10 dB attenuator ( 34 b ); f) arranging for detector ( 36 c ) to receive the signal from the convolution between the reflected signal of sensor 1 (Sens 1 ) and the inner fixed reference ( 35 a ) (RefSens 1 ); and g) arranging in a way analogous to f), detector ( 36 d ) to receive the signal from the convolution between the reflected signal to sensor (Sens 2 ) and the inner fixed reference ( 35 b ) (RefSens 2 ).