Design of Magnetic Bakhausen Noise Detection Sensor for RPV Steel
Irradiation damage is an important factor affecting the service life of reactor pressure vessel(RPV),in order to improve the performance of magnetic Barkhausen noise(MBN)signal detection instrument to evaluate the degree of irradiation damage of RPV steel,a miniaturized MBN signal detection sensor is designed.The sensor is composed of H-shaped silicon steel yoke,excitation coil,induction coil and work-type manganese zinc ferrite.It can make the detection instrument obtain a more stable MBN signal,which can effectively evaluate the irradiation damage of RPV steel.In addition,the electromagnetic simulation software ANSYS Maxwell was used to simulate and analyze the excitation module,to obtain the effective magnetization area of the specimen,namely a cube with the length of 8 mm(the distance between the two legs of the yoke),width of 8 mm(the thickness of the yoke)and depth of approximate-ly 1 mm(the thickness of the specimen).The magnetic induction intensity distribution above the specimen was analyzed to reduce the influence of the excitation signal on the MBN signal reception,and obtain the MBN signal receiver,which locates in the middle of the two legs of the magnetic yoke.Finally,by analyzing the results of the RPV specimen measurement data,the optimal excitation signal was determined wtih the amplitude of 7 V and frequency of 6 Hz.
万方数据
维普
