Eddy current displacement sensors can measure the transverse movement of pistons and position of piston rings in internal combustion engines under operating conditions. The miniature sensor has a measuring range of 0-0.5mm and response of less than 1 micrometer, with a very thin interconnecting cable. It is temperature stable up to 150-180°C and can operate in oil, petrol, air mixtures, and combustion gases and vibrations of an engine bench test. The sensor transmits data via a coaxial cable to an oscillator plug-in and demodulator plug-in for signal processing and digital display.

1. A007_e
Eddy current displacement sensors
eddyNCDT
Piston Secondary Movement and Piston Ring Position
To improve the construction of internal combustion Technical details
engines and damage analyses, it is neccessary to - Measuring range: 0 - 0,5 mm
measure the thermal and mechanical loads in the en- - Response: less than 1 µm
gine. Two important variables here are the transverse - Miniature sensor
movement of the piston (secondary movement) and - Very thin interconnecting cable
the position and deformation of the piston rings du- - Temperature stable
ring the individual operating strokes. The measure-
ments must be made under operating conditions in Ambient conditions:
order to provide reliable results. To do this, the engine - Temperature to 150 ( 180 °C)
is run on the bench either in firing or motored mode. - Oil, petrol air-mixture
- Combustion gases
- Vibrations and pressure
System configuration
U05.12 sensor with coaxial cable (ø 0,5 mm)
Sensor interconnecting cable
OS 520 - oscillator plug-in
DL 500 (DL504) - demodulator plug-in
Sensor-matching board with special temperature
compensation
Bench top cabinet for 3 or 8 channels and digital
display
The sensor cable must be laid from the moving piston to the engine block by a special crank arm.
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