CONTACT PRESSURE UNIFORM FIBER BRAGG GRATING (FBG) SENSOR

Analysis of contact pressure Fiber Bragg Grating Sensor was proposed. FBG sensor based optical fiber is one of the best sensors devices to measure the physical parameters with high accuracy compared to the conventional sensors. In this paper, a contact pressure FBG sensor with enhancement of sensitivity was analysis. Applying force on the FBG sensor caused a wavelength shift of the central Bragg wavelength depending on the amount of the applied force. However, the pressure sensitivity measurements can be influenced by the surrounding factors such as temperature. This paper showed a new method to overcome the impact of temperature on the pressure sensitivity readings. The method involved using two FBG sensors written along one optical fiber with 4 cm distance between them and 1550 nm central Bragg wavelength. Nevertheless, the experimental results with one FBG sensor showed pressure sensitivity about 2.61X10-2 nm/KPa and when two FBG sensors are used, the result showed more accurate sensitivity reading which was about 3.1065X10-3 nm/KPa. Some recommendations to enhance the setup and working are briefly outlined.