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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 · 106 N 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 6 MPa 1). And its measured pressure sensitivity is 1.10 · 10 3 MPa 1,which is 558 times of that of the bare FBG.
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, The testing results show that the Young’s modulus, Poisson’s ratio of the packaging polymer are 9.0 · 106 N m 2 and 0.49, respectively. The static pressure sensitivity of fiber optical Bragg gratings packaged by PP-1 was 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 6 MPa 1). And its measured pressure sensitivity is 1.10 · 10 3 MPa 1, which is 558 times of that of the bare FBG.