Displacement Measurement Using LVDT

A linear variable differential transformer (LVDT) is a sensor that accurately converts displacement into an electrical signal, serving a variety of high-precision applications. It excels in measuring dimensions and shapes (such as width and thickness), tracking motion (including vibration and acceleration), and monitoring strain due to thermal expansion and load. Additionally, it is essential for position control in valves, machine tools, and automation systems, where reliability and accuracy are crucial.

This design features an MCU with a high-precision analog front-end that integrates a 24-bit ΔΣ ADC and a 16-bit DAC, enabling the construction of a high-precision displacement sensor system with minimal components. This streamlined system reduces design complexity while ensuring robust durability for long-term stability in harsh environments. Applicable in fields from industrial automation to scientific instrumentation, this design supports critical systems in aerospace, manufacturing, and medical device development.

System Benefits:

• High precision and speed measurements with a 24-bit ΔΣ ADC detect even the smallest displacements, with a sampling rate of up to 125kSPS, ensuring accurate capture of rapid changes.
• The AC excitation function through a 16-bit DAC provides a stable and precise signal to the LVDT sensor.
• High-performance signal processing utilizing the RXv2 core FPU enhances the system’s capabilities to perform mathematical computations quickly and effectively.