Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras

Linear and Rotary Displacement Sensor

Technology Category/Market

Electrical Engineering: Capacitive displacement sensor, 

Applications:  Robotics, Industrial and automotive applications.

Market: The global capacitive sensor market size is expected to reach the value of USD 87.89 billion by 2029, at 15.6% CAGR during forecast period 2022 to 2029.

Targeted Industries

Watermarking IP design,

Electronic circuits

Image Gallery

Problem Statement

  • Traditionally, linear and angular displacements are measured using potentiometric, capacitive, inductive, magnetic or optical methods.
  • Said sensors or sensing techniques are used to measure either angle or displacement i.e., suitable measurement of a single variable (angular/linear displacement) at a time.
  • Those sensors have mechanical and physical limitations that will prevent them from being rotated and translated at the same time.
  • In this instance, a few prior arts are discussed, however said prior arts do not provide solutions of said issues.
  • Hence, there is a requirement to address the above issues efficiently.

Technology

Present Patent talks about capacitive displacement sensor capable of performing linear as well as angular displacement measurement.

  • The sensor includes an electrically conductive cylindrical shaft configured to move linearly along its axis and rotate about it as well.
  • Further, a semi-cylindrical shell is attached to the center of the cylindrical shaft.
  • An electrode assembly made of two pairs of semi-cylindrical shells surrounds the central shaft symmetrically.
  • By measuring the electrode capacitances and performing simple calculations, the displacements can be estimated.

Key Features/Value Proposition

Technical Perspective:

  1. Claimed Patent subject matter teaches the simultaneous measurement of linear and angular displacement.

Industrial Perspective:

  1. The device resolution for linear displacement is 18µm or lower.
  2. The device resolution for angular displacement is 0.06° or lower.
Questions about this Technology?

Contact for Licensing

Research Lab

Prof. Boby George,

Dept. of Electrical Engineering

Intellectual Property

  • IITM IDF Ref. 1480

  • Patent No: 418645 (Granted)

Technology Readiness Level

TRL- 3/4

Proof of Concept Ready & tested and validated in Laboratory stage.  

error: Content is protected !!