Rapid carbon determination method and instrument

The invention belongs to the field of carburization and carbon determination technology research, and particularly relates to a rapid carbon determination method and instrument. The method comprises the following steps of carrying out the simulation of the relation between the resistivity and carbon content of steel through thermodynamic calculation, and obtaining a relation straight line of the resistivity and carbon content; measuring the resistance of a plurality of groups of fixed carbon sheets with the known carbon content by using double bridges or four bridges to obtain a one-to-one correspondence relationship between the resistivity rho and the carbon content WC%, and setting a virtual instrument module; wiping the oil stains on the surface of the fixed carbon sheets, and cleaningthe fixed carbon sheets with a cleaning agent; and putting the fixed carbon sheets into a proper position in a closed carburizing furnace. According to the method, the adopted fixed carbon sheets arereasonable in size, the de