Dielectric constant measuring jig and method based on parallel plate capacitance method

The invention discloses a dielectric constant measuring jig and method based on a parallel plate capacitance method, and belongs to the technical field of material measurement application. The measuring jig comprises an electrode system, a sliding frame system, a thickness measuring system and a base plate. The electrode system comprises an upper pole plate, a lower pole plate, a supporting columnand a triangular bracket. The sliding frame system comprises a rotating hand wheel, a ball screw, a sliding rail and a sliding block, the rotating hand wheel is connected with the ball screw, the sliding block moves on the sliding rail, the upper pole plate of the electrode system is fixed on the sliding block, and the rotating hand wheel controls the sliding block to move and drives the upper pole plate to move. The thickness measuring system is used for measuring the relative displacement of the upper pole plate along with the movement of the sliding block. A measured sample is placed between the upper pole plate and the lower pole plate, and the dielectric constant of the sample is calculated by utilizing the read capacitance value of a parallel plate capacitor, so that the fringe effect is reduced, the precision of a measurement result is improved, and the requirements of test samples with different sizes are met.