| 摘要 |
<p>A method for contactless measuring the values of magnitudes which relate to an electrically conductive material in solid or liquid form, for instance such magnitudes as the distance of the conductive material from a given point, linear dimension(s) of a body that incorporates such material, the electrical conductivity value of the material, and the temperature of the material. In accordance with the method, an electromagnetic field, generated with the aid of a constant current which flows through at least one field generating coil, is caused to penetrate at least partially into the material. The supply of current to the at least one coil is discontinued subsequent to the magnetic field having penetrated the electrically conductive material to an extent sufficient for the intended magnitude to be measured. The voltage which is induced in at least one sensing coil located in the magnetic field as a result of the decaying magnetic field is then sensed and utilized to determine the value of the intended magnitude. The field generating coil is preferably also used as the voltage sensing coil, and the value of the intended magnitude is determined by analyzing the time variation of the induced voltage. The invention also relates to a measuring system for carrying out the method.</p> |
