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Abstract: Novel
proximity eddy current sensor array and its testing system are developed
to realize the real-time inspection of the small gaps between large
curved surfaces. The flexible sensor probe, manufactured by the flexible
printed circuit board (FPCB) process, is designed to consist of a forked
coils array with a long flat cable by the investigations to the design,
process and substrate materials for the eddy current array. The time
division multiplexing (TDM) technology is introduced for the eddy
current array to scan and sample all the sensor coils. Some reforms are
implemented to the conventional oscillator to solve the problem of the
coils having a low Q-factor and improve the performance of the sensor
system. Experimental results show that the measurement accuracy of the
sensor system can reach ±0.5% for a 2 mm full scale and the sensor
system is suitable for online gap measurements.
Key words: Eddy
current sensor Coils array Flexible substrate Proximity sensing
Time division multiplexing
CLC No: TP212.1
教育部军工配套资助项目.Received 20050718,received
in revised form 20060125
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