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Dielectrostriction Sensing 
 

Contactless detection

  • Strains/stresses

  • Contactless/non-destruction detection of fiber orientation

  • Tactile sensors

 
Sensing approach

A tested material has anisotropic dielectric properties which are described by three principal dielectric constants, ε1, ε2, and ε3. These values can be detected by interdigitated electrodes located in close proximity to the tested material. Electrodes'  capacity is determined by dielectric constants and orientation of the electrodes, see Figure.

 

For more details see:

H.Y. Lee, Y. Peng, and Y.M. Shkel, Strain-dielectric Response of Dielectrics as  Foundation for Electrostriction Stresses, J. Appl. Phys., 98 (7) (2005) p.074104.

  

 
Sensor Rosette

A sensing approach can be generalized for two- and four- elements sensor rosettes, see Figures (a) and (b). Signal subtraction can be implemented directly using analog schematics or digital subtraction of two sensor readings.

 

 

 

 

 

 

 

Detection of principal strain components

Arbitrary oriented four-sensor rosette can detect the principal strains difference and principal directions. See Figure for details:  
 

H. Y. Lee and Y. M. Shkel, “Dielectric Response of Solids for Contactless Detection of Stresses and Strains,” Submitted to Sensors and Actuators A: Physical, October, 2006.

 
 
 
 
 
 
 
Fiber orientation

Similarly arbitrary oriented four-sensor rosette can detect fiber orientation in fiber reinforced composites.