Hall difference type force measuring method for symmetrical and complementary structure

The invention discloses a Hall difference equation force measuring method for a symmetrical and complementary structure. The method comprises the following steps: (1) fixing a cylindrical permanent magnet on an elastic body, symmetrically arranging two linear Hall elements on both sides of the cylindrical permanent magnet without moving along the elastic body so as to ensure that the facing direction of the character sign surfaces of the two linear Hall elements are consistent and parallel to both end faces of the cylindrical permanent magnet and then connecting the two Hall elements into a measuring circuit; (2) applying force F to the elastic body of the step (1) so as to ensure that the cylindrical permanent magnet generates displacement change and recording an output voltage difference value of the two linear Hall elements, wherein the voltage difference value is expressed by delta U; and (3) substituting the delta U value obtained in the step (2) into the formula delta U=delta U0+2KF so as to solve the v