With the rapid development of fiber optic sensing technology, more and more related monitoring programs begin to
play an important role in oil and gas exploration. In the past, down-hole monitoring of temperature and pressure was
dependent on pump partner, electronic pressure gauge and the capillary pressure gauge. However, such devices show
many disadvantages in stability, reliability, accuracy and so on.
In the interest of special anti-corrosion, seals, high temperature, high pressure treatment, and long life, the fiber
optic sensor is critically investigated and a new design approach of fiber temperature and pressure sensor based on Fiber
Bragg Gratings and Fabry-Perot Cavity is presented, respectively. The temperature and pressure resolution of this sensor
can be as high as 0.3°C and 3psi. Meanwhile, the sensor can work under the condition from 0 to 15000psi and from -25
to 300 °C. This paper describes the technical principles, characteristics and field application of the sensor in detail.