扫频涡流检测系统设计与优化
|
摘要
针对涡流检测的灵敏度及连续性,设计了基于数字信号处理(digital signal procossing,DSP)的扫频涡流检测系统。首先,从理论上分析了实际检测中采样点数和截取长度对检波性能的影响,确立了采样点数为1 024、截取长度为4个周期的最佳参数选择;然后,基于最佳选择开发了扫频涡流检测系统;最后,当检测系统探头远离试件时,相同条件下,将阻抗分析仪阻抗与系统测量阻抗进行对比,对系统进行校正。对铁板进行测量实验,结果表明,所设计系统能实现对50kHz频率内阻抗的测量,误差小于5%。
The swept-frequency eddy current detection is usually realized by impedance analyzer.Firstly,the influence of sampling points and intercept length on detection performance is analyzed theoretically,and the best sampling points and interception lengths are consequently determined to be 1 024 and 4 respectively.Secondly,a swept-frequency eddy current detection system is developed based on the best choice.When the probe is far away from the specimen,the impedance measured by the impedance analyzer is compared with that of the system to correct the system.Finally,the iron plate is measured.The experimental results show that the designed system can measure the impedance in 50 kHz with the error less than 5%.
The swept-frequency eddy current detection is usually realized by impedance analyzer.Firstly,the influence of sampling points and intercept length on detection performance is analyzed theoretically,and the best sampling points and interception lengths are consequently determined to be 1 024 and 4 respectively.Secondly,a swept-frequency eddy current detection system is developed based on the best choice.When the probe is far away from the specimen,the impedance measured by the impedance analyzer is compared with that of the system to correct the system.Finally,the iron plate is measured.The experimental results show that the designed system can measure the impedance in 50 kHz with the error less than 5%.
引文
[1]LIBBY H L.Eddy current nondestructive testing device for measuring multiple parameter variables of a metal sample:US,3229198A[P].1966-01-11.
[2]YIN W,PEYTON A J,DICKINSON S J.Simultaneous measurement of distance and thickness of a thin metal plate with an electromagnetic sensor using a simplified model[J].IEEE Transactions on Instrumentation&Measurement,2004,53(4):1335-1338.
[3]YIN W,DICKINSON S J,PEYTON A J.A multi-frequency impedance analysing instrument for eddy current testing[J].Measurement Science&Technology,2006,17(2):393.
[4]FAN Mengbao,CAO Binghua,SUNNY A I,et al.Pulsed eddy current thickness measurement using phase features immune to liftoff effect[J].NDT&E International,2017,86(3):123-131.
[5]FAN Mengbao,CAO Binghua,TIAN Guiyun,et al.Thickness measurement using liftoff point of intersection in pulsed eddy current responses for elimination of liftoff effect[J].Sensors and Actuators A:Physical,2016,251:66-74.
[6]YIN W,PEYTON A J.Thickness measurement of non-magnetic plates using multi-frequency eddy current sensors[J].NDT&E International,2007,40(1):43-48.
[7]CAO Binghua,LI Chao,FAN Mengbao,et al.Analytical modelling of eddy current response from driver pickup coils on multi-layered conducting plates[J].InsightNon-Destructive Testing and Condition Monitoring,2018,60(2):77-83.
[8]CHENG W.Thickness measurement of metal plates using swept-frequency eddy current testing and impedance normalization[J].IEEE Sensors Journal,2017,17(14):4558-4569.
[9]MAO X,LEI Y.Thickness measurement of metal pipe using swept-frequency eddy current testing[J].NDT&EInternational,2016,78:10-19.
[10]STUBENDEKOVA A,JANOUSEK L.Impact of defect extent on swept frequency eddy current responses in non-destructive evaluation[J].Electrical Engineering,2017,99(4):1275-1281.
[11]KIATTISAKSRI P,PHUNG-ON I,POOPAT B.Adevelopment of swept-frequency eddy current for aging characterization of heat resistant steel[J].International Journal of Applied Electromagnetics&Mechanics,2017,55(2):279-287.
[12]柯海,徐志远,黄琛,等.基于信号斜率的铁磁材料脉冲涡流测厚研究[J].仪器仪表学报,2011,32(10):2376-2381.KE Hai,XU Zhiyuan,HUANG Chen,et al.Research on thickness measurement of ferromagnetic materials using pulsed eddy current based on signal slopes[J].Chinese Journal of Scientific Instrument,2011,32(10):2376-2381.(in Chinese)
[13]杨盼盼,曹丙花,范孟豹,等.脉冲涡流厚度检测仿真与实验研究[J].传感技术学报,2016,29(6):821-825.YANG Panpan,CAO Binghua,FAN Mengbao,et al.Simulation and experimental investigation of thickness measurement using pulsed eddy current technique[J].Chinese Journal of Sensors and Actuators,2016,29(6):821-825.(in Chinese)
[14]BARONTI F,LAZZERI A,RONCELLA R,et al.FPGA/DSP-based implementation of a high-performance multi-channel counter[J].Journal of Systems Architecture,2009,55(5/6):310-316.
[2]YIN W,PEYTON A J,DICKINSON S J.Simultaneous measurement of distance and thickness of a thin metal plate with an electromagnetic sensor using a simplified model[J].IEEE Transactions on Instrumentation&Measurement,2004,53(4):1335-1338.
[3]YIN W,DICKINSON S J,PEYTON A J.A multi-frequency impedance analysing instrument for eddy current testing[J].Measurement Science&Technology,2006,17(2):393.
[4]FAN Mengbao,CAO Binghua,SUNNY A I,et al.Pulsed eddy current thickness measurement using phase features immune to liftoff effect[J].NDT&E International,2017,86(3):123-131.
[5]FAN Mengbao,CAO Binghua,TIAN Guiyun,et al.Thickness measurement using liftoff point of intersection in pulsed eddy current responses for elimination of liftoff effect[J].Sensors and Actuators A:Physical,2016,251:66-74.
[6]YIN W,PEYTON A J.Thickness measurement of non-magnetic plates using multi-frequency eddy current sensors[J].NDT&E International,2007,40(1):43-48.
[7]CAO Binghua,LI Chao,FAN Mengbao,et al.Analytical modelling of eddy current response from driver pickup coils on multi-layered conducting plates[J].InsightNon-Destructive Testing and Condition Monitoring,2018,60(2):77-83.
[8]CHENG W.Thickness measurement of metal plates using swept-frequency eddy current testing and impedance normalization[J].IEEE Sensors Journal,2017,17(14):4558-4569.
[9]MAO X,LEI Y.Thickness measurement of metal pipe using swept-frequency eddy current testing[J].NDT&EInternational,2016,78:10-19.
[10]STUBENDEKOVA A,JANOUSEK L.Impact of defect extent on swept frequency eddy current responses in non-destructive evaluation[J].Electrical Engineering,2017,99(4):1275-1281.
[11]KIATTISAKSRI P,PHUNG-ON I,POOPAT B.Adevelopment of swept-frequency eddy current for aging characterization of heat resistant steel[J].International Journal of Applied Electromagnetics&Mechanics,2017,55(2):279-287.
[12]柯海,徐志远,黄琛,等.基于信号斜率的铁磁材料脉冲涡流测厚研究[J].仪器仪表学报,2011,32(10):2376-2381.KE Hai,XU Zhiyuan,HUANG Chen,et al.Research on thickness measurement of ferromagnetic materials using pulsed eddy current based on signal slopes[J].Chinese Journal of Scientific Instrument,2011,32(10):2376-2381.(in Chinese)
[13]杨盼盼,曹丙花,范孟豹,等.脉冲涡流厚度检测仿真与实验研究[J].传感技术学报,2016,29(6):821-825.YANG Panpan,CAO Binghua,FAN Mengbao,et al.Simulation and experimental investigation of thickness measurement using pulsed eddy current technique[J].Chinese Journal of Sensors and Actuators,2016,29(6):821-825.(in Chinese)
[14]BARONTI F,LAZZERI A,RONCELLA R,et al.FPGA/DSP-based implementation of a high-performance multi-channel counter[J].Journal of Systems Architecture,2009,55(5/6):310-316.