中国机械工程2012，Vol.23Issue(17)：2098-2102,5.DOI:10.3969/j.issn.1004-132X.2012.17.017
相敏检波在空气耦合超声检测中的应用
Application of Phase—sensitivity Detector in Air—coupled Ultrasonic Testing
摘要
Abstract
The signal to noise ratio(SNR) of air-coupled ultrasonic testing is very poor and there is long time pulse residue, so it needs to adopt appropriate signal processing method to enhance the SNR of received signals. Factors which affected the received signals in ultrasonic testing process were analyzed. Phase sensitivity detection technology was presented to process the received signals, and ultrasonic testing information could be acquired by the calculation of phase signals. The principles of super- heterodyne receiver and phase sensitivity detector were introduced, some problems which should be payed attention in ultrasonic testing process were explained. Based on the research results, air - coupled ultrasonic testing system with phase sensitivity detector is constituted. Experimenal results of image testing on carbon fiber reinforced plastic plate indicate that, phase sensitivity detection technology can improved SNR of system and testing effects in evidence.关键词
空气耦合超声/相敏检波/超外差接收/超声成像Key words
air-coupled ultrasonic/ phase-sensitivity detector/ super-heterodyne receiver/ ul-trasonic imaging分类
通用工业技术引用本文复制引用
魏东,周正干..相敏检波在空气耦合超声检测中的应用[J].中国机械工程,2012,23(17):2098-2102,5.基金项目
国家自然科学基金资助项目(50675012) （50675012）
航空检测与评价航空科技重点实验室(南昌航空大学)开放基金资助项目(HK2008003) （南昌航空大学）
北京市教育委员会共建项目专项资助 （）
