Abstract
A novel method of monitoring bone fracture healing has been developed. The sensor is based on the stress dependence of permeability of the highly magnetostrictive amorphous ribbons. The magnetoelastic sensor is bonded to a stainless steel plate. The detection is provided by an outside coil surrounding the limb. Stresses introduced by the adhesives degrade the sensor's performance. These are overcome by prestressing and annealing the material bonded with a high temperature adhesive. Using these techniques, it is possible to design a tensile stress or compressive stress sensor to be used in strain measurement of the plates. Such a sensor has considerably higher sensitivity, lower power consumption and is less invasive than a traditional strain gauge. The characteristics of these enhanced sensors are studied and optimum conditions on sensors' performance are reported.
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