All-fiber current sensor sensing head and method for compensating linear birefringence

The invention discloses an all-fiber current sensor sensing head for compensating linear birefringence, which comprises a support structure and a current sensing unit arranged in the support structure, and is characterized in that the current sensing unit comprises a sensing fiber, a 1/4 wave plate welded at one end of the sensing fiber and a reflection unit welded at the other end of the sensing fiber; the outer diameter of the optical fiber baffle is smaller than the diameter of the optical fiber winding groove; at least four bolt holes are evenly formed in the optical fiber baffle in the circumferential direction, correspondingly, nuts for locking the bolts are arranged at the positions, located in the optical fiber winding grooves, of the annular bottom plate, and the bolts penetrate through the bolt holes of the optical fiber baffle and then are matched with the nuts. The distance between the sensing head body and the sensing optical fiber is adjusted through the bolt, operation is simple, and control is