Title :
Development of a GMI sensor for evaluating microstructural degradation in ferromagnetic materials
Author :
Sarkar, Pradyut ; Roy, R.K. ; Panda, Anup Kumar ; Mitra, Abhijit
Author_Institution :
NDE & Magn. Mater. Group, CSIR-Nat. Metall. Lab., Jamshedpur, India
Abstract :
A Giant Magneto-Impedance (GMI) based electromagnetic sensing device has been designed and developed using a nanostructured CoFeSiB microwire as sensing core element. The sensor consists of three segments, (i) signal generation and amplification unit, (ii) transducer with the bridge circuit and (iii) the detection circuit. The sensor output voltage is directly correlated to hardness variation in heat-treated 9Cr-1Mo steel and martensite volume fraction in the deformed 304 SS austenitic stainless steel. The amplitude of GMI voltage in defective welded pipe has also been investigated. The present study indicated that the developed GMI sensor can be applicable for structural health monitoring of service exposed engineering components.
Keywords :
amplifiers; austenitic stainless steel; boron alloys; bridge circuits; chromium alloys; cobalt alloys; ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic sensors; martensitic steel; microsensors; molybdenum alloys; nanosensors; silicon alloys; transducers; CoFeSiB; Cr-Mo; GMI sensor; amplification unit; bridge circuit; deformed 304 SS austenitic stainless steel; detection circuit; electromagnetic sensing device; ferromagnetic materials; giant magneto-impedance sensor; heat treated steel; martensite volume fraction; microstructural degradation; nanostructured microwire; sensing core element; signal generation unit; transducer; Bridge circuits; Electrodes; Magnetomechanical effects; Materials; Sensors; Steel; Welding; GMI Sensor; Magnetic phases; Microstructural degradation; Structural health monitoring;
Conference_Titel :
Sensing Technology (ICST), 2012 Sixth International Conference on
Conference_Location :
Kolkata
Print_ISBN :
978-1-4673-2246-1
DOI :
10.1109/ICSensT.2012.6461650
