Patent ID: 7719263
Filing Date: 2010-05-18
Classification: G01D

Abstract:
1. An inductive position measuring device comprising: a measuring element which is movable; at least first and second digital oscillators respectively having first and second measuring coils and producing first and second pulse frequencies; said first oscillator having said first measuring coil included such that changes in said first pulse frequency of the first oscillator are generated due to changes in inductivity that are generated by said measuring element depending on an amount of coverage between said first measuring coil and said measuring element; said second oscillator functioning as one of: a digital evaluation circuit in which the first and second pulse frequencies are counted and tallied, wherein as a low reference oscillator said second oscillator contains said second measuring coil as a reference coil that is not covered by said movable measuring element so that said second pulse frequency is a low frequency reference that compensates frequency-influencing parameters including ambient temperature and component aging.