A1.3 Multichannel Heterodyning-Based Eddy Current Testing with Magnetoresistive Sensors
- SMSI 2020
(did not take place because of Covid-19 virus pandemic)
- SMSI 2020 - Sensors and Instrumentation
- A1 Magnetic Sensors
- H. Ehlers, M. Pelkner - Federal Institute for Materials Research and Testing (BAM), Berlin (Germany), R. Thewes - Institute of Technology Berlin, Berlin (Germany)
- 45 - 46
High spatial resolution magnetoresistive arrays are utilized for eddy current testing in combination with a single wire excitation and a heterodyne principle to minimize metrology efforts. A discrete frontend with FPGA-based data acquisition makes use of a 128-element eddy current probe to test 440 μm artificial surface defects with an SNR of 24 dB.