Apparatus for determining current position of a rod and method of determining current position of a rod

摘要

The rod position detecting device, which rod (8) is movable in at least a portion of the passage (70), comprises a processor device (24) including a processor (36) and a memory (40), an input device (28) connected to the processor device and comprising at least a first transmitting antenna (56, 60) configured to be positioned at a first location along the passage, and at least a first receiving antenna (64, 68) configured to be positioned secondly along the passage, an output device (32) connected to the processor equipment. The memory (40) stores a set of standard programs (44) including a standard signal analysis program that ensures that the device performs operations on the processor. The method of detecting the current position of the bar, which bar (8) is movable in at least a portion of the passage (70), comprises transmitting an electromagnetic signal at a first location of the transmitting antenna (56, 60) along the passage, detecting as input of at least a portion of the electromagnetic signal at the second location of the receiving antenna (64, 68) along the passage, determining a group delay of at least a portion of the input and utilizing a group delay in association with the calibration data set (48) to determine the current bar position (8) that corresponds to the group delay.