| Abstract: | A packaging polymer (PP-1) that can enhance the sensitivity of fiber Bragg grating (FBG) pressure sensor was designed and synthe-sized from hydroxyl terminated polypropylene oxide oligomers, toluene diisocyanate (TDI), 1,4-butandiol as chain extender, catalyzer,foam agent and foam stabilizer. The testing results show that the Young's modulus, Poisson's ratio of the packaging polymer are 9.0×106N m-2 and 0.49, respectively. The static pressure sensitivity of fiber optical Bragg gratings packaged by PP-1 was discussed.The theoretical pressure sensitivity of FBG packaged with the polymer cylinder is -1.73×10-3 Mpa-1, which is 896 times of that of the bare FBG (-1.93×10-6MPa-1). And its measured pressure sensitivity is -1.10×10-3 Mpa-1, which is 558 times of that of the bare FBG. |
