| 摘要 |
<p>The invention relates to a method and a system for determining a coordinate (x) of the distance between, on the one hand, a transponder (3) which is placed at a height (h) above a plane and, on the other hand, a body placed in said plane. The transponder (3) is irradiated by radiation having a primary frequency (fp) and, in response thereto, emits radiation having a secondary frequency (fs). The body interacts with a frequency source and transmitting coil (1) for the primary frequency (fp) and carries at least a first measuring coil (2a; 2b) attached to the body and a second measuring coil (2b; 2a), at a fixed distance therefrom, for the secondary frequency (fs). From the first and the second measuring coil, a first measuring signal (Ux) and a second measuring signal (Uh), respectively, are taken off which depend, according to a first and a second set of known relationships [f(x,h)] and [g(x,h)], respectively, on the distance coordinate (x) and the transponder height (h). From the second measuring coil (2b; 2a) a second measuring signal (Uh) is taken off which depends, according to a second set of known relationships [g(x,h)], on the distance coordinate (x) and the transponder height (h). By making use of calibration tables in which these relationships are defined and which are stored in one or more memories, the distance coordinate (x) in the plane is derived from the measured values obtained.</p> |
