Design of an optical ultrasonic signal testing system using LabVIEW
Optical methods are used in ultrasonic testing to overcome the limitation of conventional contact transducers in bad situations and have become a hot branch in ultrasonic testing methods.However,the sensitivity in optical methods is lower than that of contact transducers and the use of laser devices brings more noises,which make the signal to be tested more complex.In view of the characteristics of the signal in optical testing,wavelet transform and complex analytic wavelet envelope detection are introduced to extract the signal and its features.Then an optical ultrasonic signal testing virtual instrument system based on LabVIEW is designed,integrating signal acquisition,digital filtering,noise suppression,power spectrum analysis,peak extraction and envelope detection as a whole.Compared with those heavy and expensive equipments,the friendly interface,convenient operation and high extendibility prove its flexibility and value.Finally,experiments are carried out to verify the reliability and precision of the system.Results show a relatively error below 1% in multiple measures.
optical ultrasonic testing LabVIEW wavelet denoising envelope detection
Yukun LUO Shitu LUO Feilu LUO Mengchun PAN Xianglin TAN
Department of Instrument Science and Technology, College of Mechatronics and Automation,National University of Defense Technology, Changsha, 410073, China
国际会议
2012第八届精密工程测量和仪器仪表国际研讨会(ISPEMI2012)
成都
英文
1-8
2012-08-08（万方平台首次上网日期，不代表论文的发表时间）