SNOAA76 August   2021 LDC3114 , LDC3114-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Benefits of Inductive Proximity Sensing
    2. 1.2 Common Applications
    3. 1.3 Human-Machine Interface Design Guide
  3. 2System Considerations
    1. 2.1 Target Properties
    2. 2.2 Sensing Distance
    3. 2.3 LDC3114 Device Features
  4. 3Design
    1. 3.1 Sensor Size and Frequency
    2. 3.2 Linear Sensing Region
  5. 4Measured Raw Data Output
    1. 4.1 Measured Response of LDCCOILEVM Sensor N
    2. 4.2 Measured Response of LDCCOILEVM Sensor R
  6. 5Observed Effects of Ambient Temperature
  7. 6References

3 Design

Figure 3-1 describes the process of selecting sensor parameters for measurement optimization. It is important to make these design decisions with the desired sensing range in mind, because different applications may have different priorities.

To maximize resolution the sensing range should be within the linear region of the inductance versus distance response, as discucssed in Section 2.2. To help verify design, the Inductive Sensing Design Calculator Tool is a general purpose tool that allows sensor parameters to be entered in the Spiral Inductor Designer tab and checked against device specifications. There are also various device-specific tabs that allow further visualization of system performance.

Figure 3-1 Sensor Design Flowchart

For a more detailed discussion on sensor design, see the LDC Sensor Design application note.