Sensing systems using quartz sensors and fiber optics

A pressure sensing system (10) using optical fiber, comprising:

• a plurality of quartz sensors (Q1, Q2, . . . , Qn), each having a respective input and two respective outputs, responsive to pressure, and further responsive to an electrical power signal received in the respective input, each quartz sensor (Q1, Q2, . . . , Qn) sensing the pressure free of temperature effect over time, for providing from the two outputs respective quartz electric sensor signals (S11, S12;
• S21, S22;
• . . . ;
• Sn1, Sn2) containing information about the change in pressure;
• a plurality of transducers (T1, T2, . . . , Tn), having two inputs, responsive to the respective quartz electric sensor signals (S11, S12;
• S21, S22;
• . . . ;
• Sn1, Sn2) received in the two inputs, for providing a plurality of electromechanical transducer forces containing information about the plurality of quartz electric sensor signals;
• a broadband optical source (12) for providing a broadband optical source signal;
• an optical fiber (F) having fiber Bragg Grating pairs therein (20, 22;
• 24, 26;
• 28, 30) each with a respective wavelength (λ1, λ2, . . . , Xn), responsive to the plurality of electromechanical transducer forces, for changing an optical parameter or characteristic of the broadband optical source signal depending on the change in length of the optical fiber and providing a plurality of fiber Bragg Grating optical signals containing multiplexed information about the plurality of electromechanical transducer forces;
• and
• a measurement unit (40), responsive to the plurality of fiber Bragg Grating optical signals, for providing a measurement unit signal containing information about the change in pressure.

A pressure sensing system, comprising:

• a quartz sensor, responsive to pressure, and further responsive to an electrical power signal, each quartz sensor sensing the pressure free of temperature effect over time, for providing an electrical quartz sensor signal containing information about the pressure;
• an acoustic transducer, responsive to the quartz sensor signal, for providing an acoustic wave containing information about the quartz sensor signal;
• an optical source for providing an optical source signal;
• an optical fiber, responsive to the acoustic wave, for changing an optical parameter or characteristic of the optical source signal depending on the change in length of the optical fiber and providing a transduced optical signal containing information about the acoustic wave from the acoustic transducer;
• and
• a measurement unit, responsive to the transduced optical signal, for providing a measurement unit signal containing information about the pressure.

A pressure sensing system, comprising:

• a quartz sensor having an input and two outputs, responsive to a pressure, and further responsive to an electrical power signal received in the input, each quartz sensor sensing the pressure free of temperature effect over time, for providing from the two outputs quartz sensor electrical signals containing information about the pressure;
• electromechanical converter means having two inputs, responsive to the electrical quartz sensor signals received in the two inputs, for providing a mechanical converter force containing information about the sensed voltage or current signal;
• an optical source for providing an optical source signal;
• an optical fiber, responsive to the mechanical converter force, for changing an optical parameter or characteristic of the optical source signal depending on the change in length of the optical fiber and providing an electromechanical converter optical signal containing information about the mechanical converter force;
• and
• signal processor means, responsive to the electromechanical converter optical signal, for providing a signal processor signal containing information about the pressure.