Related Experiment Video
Updated: Dec 27, 2025

A Simple Approach to Perform TEER Measurements Using a Self-Made Volt-Amperemeter with Programmable Output Frequency
Published on: October 5, 2019
A novel hybrid serial/parallel multi-frequency measurement method for impedance analysis in eddy current testing.
Ziqi Chen1, Jorge R Salas-Avlia1, Yang Tao1
1Department of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL, United Kingdom.
This study introduces a hybrid serial/parallel method for measuring eddy current sensor impedance. It balances measurement speed and signal-to-noise ratio (SNR) for diverse applications.
Area of Science:
- Electrical Engineering
- Sensor Technology
- Measurement Science
Background:
- Eddy current sensors are crucial for non-destructive testing and material characterization.
- Traditional multi-frequency measurement methods offer trade-offs between speed (parallel) and signal-to-noise ratio (SNR) (serial).
- Optimizing both speed and SNR is essential for advanced sensor applications.
Purpose of the Study:
- To propose a novel hybrid serial/parallel multi-frequency measurement method for eddy current sensors.
- To develop a flexible system that can be tailored for specific speed and SNR requirements.
- To validate the proposed method by measuring inductive sensor impedance.
Main Methods:
- A hybrid serial/parallel multi-frequency measurement approach was developed.
- A field-programmable gate array (FPGA) system was designed for implementation.
- Direct digital synthesis (DDS) generated composite parallel excitation signals.
- Digital I/Q demodulators processed received multi-frequency data simultaneously.
Main Results:
- The hybrid method successfully combined the benefits of serial and parallel measurements.
- The developed FPGA system demonstrated effective impedance measurement of inductive sensors.
- Measurements from the designed system showed good agreement with a commercial impedance analyzer.
Conclusions:
- The proposed hybrid method offers a versatile solution for eddy current sensor impedance measurement.
- The developed system provides a flexible platform for achieving desired speed and SNR.
- This approach enhances the accuracy and efficiency of inductive sensor characterization.
More Related Videos
06:17Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
Published on: January 16, 2020
07:44Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
Published on: April 27, 2016
Related Concept Videos
Mesh Analysis for AC Circuits
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
Electronic Distance Measuring Instruments
Impedance Combination
Eddy Currents
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Three-Phase Short Circuit—Unloaded Synchronous Machine
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....