Capacitive Encoder

Netzer Precision Motion Sensors has taken a revolutionary position sensing technology, originally developed for harsh environment specialized applications, and made it available for today’s broader range of defense, homeland security, aerospace and instrumentation motion control requirements. Standard and customized rotary and linear electric encoders are also applicable to medical, automotive and a wide range of other applications.

The Electric Encoder™ non-contact technology relies on interaction between the measured displacement and a space/time modulated electric field. It offers a blend of features unequalled by optical or magnetic encoders.

Application scenarios for capacitive encoders

Typical reasons for using capacitive encoders:

  •     the environment is heavily affected by electromagnetic interference
  •     an extremely short axial overall length is required
  •     a large internal bore in combination with short axial length is required
  •     Robustness against dust, humidity, shock and vibration is required

Our capacitive encoder uses the capacitive measuring principle and is therefore immune to EMC interference. EMC disturbances can occur in the vicinity of power electronics or in certain medical applications such as MRI (magnetic resonance imaging) technology. Due to the holographic measuring principle, which derives the signal over the full effective area of the encoder disc, the accuracy is less sensitive to mounting tolerances than with optical angle measurement systems. The capacitive encoder has no glass disc and no light source / light receiver and is therefore insensitive to dust, humidity, shock and vibration.