Abstract
A review of the different applications and developments of using Quantum Well Hall Effect (QWHE) sensors for NDE applications is provided. In addition, a method for using a QWHE sensor-based device to sensitively map the magnetic field across an NDE weld sample was performed.
A QWHE sensor-based AC–DC magnetometer developed at the University of Manchester, with a bandwidth of 1.5 kHz and a minimum detection limit of 500 nT, was used to obtain direct magnetic field measurements of a dressed steel weld sample. The linear surface-breaking defect present in the sample had dimensions of 14 mm length, 1.75 mm depth and a 40 휇m gape.
The sample was illuminated using an AC magnet capable of operating between 0 – 2 kHz. The RMS magnetic field strengths used in this investigation varied between 3 to 33 mT. Results from this study confirm that the Magnetic Flux Leakage (MFL) caused by the surface-breaking defect can be detected across the entire 50 Hz – 1.2 kHz range using the highly sensitive QWHE sensor-based magnetometer.
A QWHE sensor-based AC–DC magnetometer developed at the University of Manchester, with a bandwidth of 1.5 kHz and a minimum detection limit of 500 nT, was used to obtain direct magnetic field measurements of a dressed steel weld sample. The linear surface-breaking defect present in the sample had dimensions of 14 mm length, 1.75 mm depth and a 40 휇m gape.
The sample was illuminated using an AC magnet capable of operating between 0 – 2 kHz. The RMS magnetic field strengths used in this investigation varied between 3 to 33 mT. Results from this study confirm that the Magnetic Flux Leakage (MFL) caused by the surface-breaking defect can be detected across the entire 50 Hz – 1.2 kHz range using the highly sensitive QWHE sensor-based magnetometer.
| Original language | English |
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| Publication status | Published - 7 Sept 2017 |
| Event | The 56th Annual British Conference of Non-Destructive Testing - Telford, UK, Telford, United Kingdom Duration: 5 Sept 2017 → 7 Sept 2017 http://www.bindt.org/events/PastEvents/ndt-2017/ |
Conference
| Conference | The 56th Annual British Conference of Non-Destructive Testing |
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| Abbreviated title | NDT 2017 |
| Country/Territory | United Kingdom |
| City | Telford |
| Period | 5/09/17 → 7/09/17 |
| Internet address |
Keywords
- Magnetic field imaging
- Magnetovision
- magnetometry
- Quantum well
- Quantum Well Hall Effect Sensor
- Non-destructive testing
- Non-destructive evaluation
- magnetic flux leakage