Non destructive testing has become an important tool in ensuring both quality and reliability in ... more Non destructive testing has become an important tool in ensuring both quality and reliability in many industrial components. Even though these techniques were originally targeted for safety critical and high economic value applications, they have found increasing use in post production quality control. Eddy currents is the preferred method for the inspection of metallic parts and metallic joints, such as welds and riveted joints. The working principle is based on the generation, through induction, and analysis of electric currents in the test material, allowing conductivity measurements and flaw detection, among others. This work presents the development of an electronic system which applies heterodyning principles for eddy currents non-destructive testing, and is compatible with a planar structure probe designed for friction stir welds defect detection. The system comprises all the required hardware modules for eddy currents inspection. These include probe driving, with digitally s...
2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2014
In this work an eddy current testing instrument employing heterodyning based measurements is pres... more In this work an eddy current testing instrument employing heterodyning based measurements is presented. The instrument is composed of a portable computer and a dedicated electronic measurement circuitry to operate a specific type of probe. A DDS waveform generator and a transconductance amplifier are used to drive the probe with high amplitude currents and frequency up to 10 MHz. The probe output voltage is amplified up to 60 dB and down-converted to a lower intermediary frequency. The signal is converted into the digital domain and processed to compute the real and imaginary parts of the probe output voltage. The developed dedicated electronics were installed inside a rugged laptop computer to form a standalone instrument with post-processing and visualization capabilities. Electrical characterization and application results using the instrument and a particular eddy current probe are presented.
Non destructive testing has become an important tool in ensuring both quality and reliability in ... more Non destructive testing has become an important tool in ensuring both quality and reliability in many industrial components. Even though these techniques were originally targeted for safety critical and high economic value applications, they have found increasing use in post production quality control. Eddy currents is the preferred method for the inspection of metallic parts and metallic joints, such as welds and riveted joints. The working principle is based on the generation, through induction, and analysis of electric currents in the test material, allowing conductivity measurements and flaw detection, among others. This work presents the development of an electronic system which applies heterodyning principles for eddy currents non-destructive testing, and is compatible with a planar structure probe designed for friction stir welds defect detection. The system comprises all the required hardware modules for eddy currents inspection. These include probe driving, with digitally s...
2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2014
In this work an eddy current testing instrument employing heterodyning based measurements is pres... more In this work an eddy current testing instrument employing heterodyning based measurements is presented. The instrument is composed of a portable computer and a dedicated electronic measurement circuitry to operate a specific type of probe. A DDS waveform generator and a transconductance amplifier are used to drive the probe with high amplitude currents and frequency up to 10 MHz. The probe output voltage is amplified up to 60 dB and down-converted to a lower intermediary frequency. The signal is converted into the digital domain and processed to compute the real and imaginary parts of the probe output voltage. The developed dedicated electronics were installed inside a rugged laptop computer to form a standalone instrument with post-processing and visualization capabilities. Electrical characterization and application results using the instrument and a particular eddy current probe are presented.
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Papers by Diogo E Aguiam