Piston Based Resistor

Patent Status: 

Patent Filed

Indian Patent Applicaton No: 


Patent Category: 


It deals with development of a device which measures vertical height. Developed device converts measured length into voltage signal. Then this acquired voltage can be reconverted into measured height with the help of calibration coefficient.

Key Features: 

  •  The device is basically a variable resistance which varies against the movement of piston in either direction
  •  Carbon granules were used as filler in between two conducting plates. The plates were kept inside an insulator cylinder
  •  One piston is made stationary and other piston is allowed to move inside the cylinder [a restricted motion) to change the density of filler between the piston plates, which results in a changed resistance.


  • Measurement of uni-dimensional displacement or pressure of surface profiles.

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