1. A014_e
Eddy current displacement sensors
eddyNCDT
Measurement of blade-tip clearance on turbines and compressors
Knowledge of the blade-tip clearance under different Reasons for the system selection
operating conditions is important for the optimization - Fast speed
of efficiency and functional reliability. The clearance - Sensors in small sizes
is acquired with a non-contacting displacement - Good ambient compatibility
sensor which measures the distance to the blade tips - Temperature stability
from the housing. The arduous ambient conditions, - Optimum signal conditioning
the shape of the blade and the extremely short dwell
period of the blade in the acquisition range represent Technical details
high demands on the sensor. With extremely fast - Measuring range:1 mm
rotating turbines the step response of the - Accuracy :0,005 mm
demodulator electronic unit can be further improved - Resolution: 0,002 mm
by a special option (signal decay time 1.5 µs). A - Banndwidth: 0 - 100 kHz
integral peak-peak detector in the controller saves
the minimum value of the output signal each Ambient conditions
revolution, which corresponds to the smallest tip - Temperature 180 °C
clearance and is important for monitoring. A - Medium Fluid
following limit switch provides advance warning or
safety switching in case of risk of damage.
Principle
Sensor
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