Magnetic flux detecting method for open-loop magnetic flux sensor

Abstract

The invention relates to a magnetic flux detecting method for an open-loop magnetic flux sensor, belongs to the field of civil engineering, and is applicable to safety and health detection of cable structures. In the method, an open-loop coil is used, and comprises two semicircular open-loop coil units connected in series; a conducting wire on the inner side of each open-loop coil unit is propped against a cable; the magnetic variation of the cable generates induced electromotive force on the conducting wires on the inner side; conducting wires on the outer side of the open-loop coil units are magnetically shielded by 3-layer electrical pure iron with the thickness of 0. 5 mm; the external magnetic field cannot penetrate the relatively thick shielding material, and the reversed induced electromotive force is not generated on the conducting wires on the outer side; a ring is formed between the two semicircular open-loop coil units; the cable is put in the ring; the magnetic variation of the cable generates the induced electromotive force on the circular arc conducting wires on the inner side; the ring is equal to a round coil; the magnetic flux of the cable can be obtained through measuring the induced electromotive force.

Description

technical field [0001] The invention relates to a magnetic flux detection method of an open-loop magnetic flux sensor, which belongs to the field of civil engineering and is applied to the safety and health detection of cable structures. Background technique [0002] Existing technology: At present, the magnetic flux cable force sensor measures the magnetic field strength of the cable, which is the coil method, that is, a large number of coils are wound on the cable, and the magnetic field change of the cable is obtained through this coil. remove. Only one magnetic flux induction coil can be used for one cable, and it is impossible to test multiple cables with one induction coil, which consumes a lot of materials. Contents of the invention [0003] In order to overcome the above-mentioned defects, the present invention aims to provide a magnetic flux detection method of an open-loop magnetic flux sensor. The induction coil can be removed from the cable to test multiple ca...

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Problems solved by technology

[0002] Existing technology: At present, the magnetic flux cable force sensor measures the magnetic field strength of the cable, which is the coil method, that is, a large number of coils are wound on the cable, and the magnetic field change of the cable is obtained through this coil. remove

Only one magnetic flux induction coil can be used for one cable, and one induction coil cannot test multiple cables, consuming a lot of materials

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