Turbine blade clearance on-line measurement system

摘要

A monitoring system for measuring the gap between a turbine blade and a stationery component of a turbine, includes an insertion probe having a sensor which is moved radially within the gap to a pre-selected distance from the turbine blade as measured by the sensor's output. The distance the sensor moved from a reference point to arrive at the pre-selected distance from the blade is also monitored and the gap between the fixed turbine component and the blade is determined from these measurements.