Abstract：In order to realize the precise measurement of bridge cable force, a kind of assembled fiber Bragg grating pressure ring was explored based on the advantages of FBG sensor. Through numerical simulation, the different length and diameter ratio of the combined pressure ring and different thickness of flange plate were studied and optimized, and the encapsulation method of the fiber Bragg grating sensor was probed, the reasonable range of the pressure ring geometrical parameters was obtained. A specification of the pressure ring in the reasonable range was obtained to verify the experiment, and the feasibility of the pressure ring in design and application. Finally, the geometrical parameters range of the pressure ring was determined, and it was proved that the combined fiber Bragg grating pressure ring had excellent performance in linearity, sensitivity, hysteresis, repeatability and total precision, which could meet the requirements of engineering test.

Keyword：pressure ring;numerical analysis;calibration experiment;assembled fiber Bragg grating (FBG) ;