| 摘要 |
PCT No. PCT/US81/01388 Sec. 371 Date Nov. 16, 1981 Sec. 102(e) Date Nov. 16, 1981 PCT Filed Oct. 14, 1981 PCT Pub. No. WO83/01505 PCT Pub. Date Apr. 28, 1983.A system (10) for determining the thickness of a magnetic flux conductive clad material over a magnetic flux conductive base material of different permeability applies on alternating voltage (96) to the primary winding (52) of an incomplete core-type transformer (54). The secondary winding (40) voltage to primary winding (52) voltage ratio is determined with the material being clad-thickness measured (56) completing the incomplete core (54). The voltage ratio is a nondestructive measurement of the thickness (64) of the clad material. The preferred embodiment applies a constant voltage alternating voltage power source (18) to the primary winding (52). This obviates the need to determine the ratio of voltages. The secondary winding (40) voltage is a direct nondestructive measurement of the thickness (64) of the clad material. By reference to a particular clad material-base material chart, the clad thickness is read from the scale adjacent the intersection of the voltage induced in secondary winding (40) and the curve (78,80,82,84,86,88,90,92,94) representing the composition of the clad material. |
