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

1 The Sensor

An inductive-to-digital converter (LDC) senses the change in inductance caused by the movement of a conductive target through the senor’s AC magnetic field. The target movement with respect to the sensor may be either axial or lateral with respect to the plane of the sensor. The characteristics of the sensor, as discussed in the TI application note LDC Sensor Design, determine the characteristics of the sensor’s magnetic field and the overall system measurement resolution and accuracy.