Abstract: The invention belongs to the technical field of current detection, in particular to a fluxgate current sensor and a current measurement method, wherein the fluxgate current sensor comprises a magnetic probe and an excitation and detection circuit, and the magnetic probe comprises an excitation iron core and an excitation coil, the excitation coil is connected to the excitation and detection circuit, the excitation and detection circuit is used to output alternating excitation voltages to the excitation coil, and the excitation coil is excited to generate alternating excitation currents and cause the excitation iron core to reach saturation alternately; the excitation and detection circuit is further configured to convert the excitation currents flowing through the excitation coil, into equivalent differences of two currents, so as to calculate average values of the excitation currents flowing through the excitation coil via differential equivalent currents, thereby calculating to-be-measured primary currents

Abstract: A preparation method of a reprocessable thermosetting polyesteramide (PEA) includes: (1) mixing 30 to 200 parts by weight of a liquid dicarboxylic acid and 15 to 95 parts by weight of a ?-hydroxyl-containing diamine compound, and heating for dissolution to obtain a reaction solution; (2) adding 0.05 to 0.5 parts by weight of a catalyst to the reaction solution, and heating under a nitrogen atmosphere to allow a reaction at 65° C. to 100° C. for 1 h to 6 h; (3) heating a reaction system obtained in step (2) to allow a reaction at 100° C. to 180° C. for 3 h to 18 h; (4) heating a reaction system obtained in step (3) to allow a reaction at 180° C. to 240° C. for 0.5 h to 4 h; and (5) cooling a reaction system obtained in step (4) to 100° C. to 180° C. A PEA prepared by the above preparation method is further provided.