SNOA957B September   2016  – June 2021 LDC0851 , LDC1001 , LDC1001-Q1 , LDC1041 , LDC1051 , LDC1101 , LDC1312 , LDC1312-Q1 , LDC1314 , LDC1314-Q1 , LDC1612 , LDC1612-Q1 , LDC1614 , LDC1614-Q1 , LDC2112 , LDC2114 , LDC3114 , LDC3114-Q1

 

  1.   Trademarks
  2. 1The Sensor
  3. 2Eddy Currents
    1. 2.1 Image Currents and Target Size
    2. 2.2 Skin Depth
    3. 2.3 Sensors Have Two Sides
    4. 2.4 LDC Interaction Through Conductor
  4. 3Target Shape
  5. 4Target Composition
    1. 4.1 Perfect Target Material Characteristics
    2. 4.2 Aluminum Targets
    3. 4.3 Copper Targets
    4. 4.4 Steel and Magnetic Material Targets
    5. 4.5 Conductive Ink
    6. 4.6 Ineffective Target Materials
  6. 5Summary
  7. 6References
  8. 7Revision History

Conductive Ink

Targets printed in conductive ink can be used to create a wide variety of target shapes. Many conductive inks are based on silver, which is an excellent conductor but due to the additional materials in the ink conductivity is typically just ~30% of pure silver. This reduction in conductivity unfortunately increases the skin depth of conductive inks, which are also quite thin - typically 15 µm or thinner. The measured LDC response is typically <10% compared to a silver conductor with a thickness of 4+ skin depths.

This reduced response limits the precision of applications using conductive ink targets, but for many cases it is acceptable.