Measuring unit for use in measuring system for telemetric evaluation of electrical oscillating circuit, has phase detector determining phase difference between electrical reference oscillation and electrical measuring oscillation

摘要

The measuring unit (1) has a vibration source (3) for generating electrical reference oscillation in a reference branch (6) and electrical measuring oscillation in a measuring branch (7). A coupling coil (4) is arranged in the measuring branch and inductively coupled to a resonant circuit coil (21) of sensors (20). A phase detector (5) taps the reference oscillation at the reference branch and the measuring oscillation at the measuring branch. The phase detector determines phase difference between the reference oscillation and the measuring oscillation.