Abstract
A distributed field sensor is presented in this paper, based on the modulation of microstrains generated by a long exciting coil along the length of a magnetostrictive delay line (MDL). Experimental results are reported concerning as-cast and annealed amorphous FeSiB wires, indicating that spatial resolution is the main advantage of the sensor, while sensitivity, hysteresis and uncertainty can be competent after annealing the magnetostrictive elements. The response of this sensor offers sensitivity of the order of 100 pT and a spatial resolution of the order of 100 μm, thus allowing applications in non-destructive testing and evaluation in magnetic surfaces.
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