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

Ineffective Target Materials

Use of low conductivity materials will result in a correspondingly small inductive sensor shift, which restricts the measurement resolution of the LDC. For example, water is not an effective target material. Even a saturated salt water solution has a conductivity that is 0.000001% of copper, which results in an extremely small inductive response.

The human body is another poor target; while in some conditions it may appear to provide a noticeable response, the actual source of the shift is a capacitive interaction with the sensor.