FOULING DETECTION IN FOOD VESSELS USING INTERDIGITAL LAMB WAVE TRANSDUCER  

作　　者：JIAO Jingpin GE Haiyan WU Bin HE Cunfu 

机构地区：[1]College of Mechanical Engineenng and Applied Electronic Technology, Beijing University of Technology, Beijing 100022, China

出　　处：《Chinese Journal of Mechanical Engineering》2007年第1期111-114,共4页中国机械工程学报（英文版）

基　　金：This project is supported by National Natural Science Foundation of China (No. 60404017);Municipal Natural Science Foundation of Beijing, China (No.4052008);Plan of Excellent People Cultivation of Beijing, China (No. 20051D0501506)

摘　　要：Lamb waves are used to detect fouling in food vessels. The propagation of the Lamb waves in plates exhibits many modes and dispersion characteristics, which have great influence on fouling detection. The relative distribution of the in-plane and out-of-plane displacement of the mode across the thickness of the plate will determine the sensitivity of the mode to a particular loading condition. By considering the dispersion and multi-mode characteristics of guided waves, an interdigital polyvi- nylidene fluoride （PVDF） transducer is designed to realize the mode selection of gnided waves, and a single a0 mode is used for guided wave detection. Fouling detection experiments are conducted in the laboratory using epoxy adhesive on a thin plate. Using the interdigital PVDF transducer, three fouled areas are detected. Using one of the time-frequency analysis methods, the waveforms are further processed. This also demonstrates the validity of this method of fouling detection.Lamb waves are used to detect fouling in food vessels. The propagation of the Lamb waves in plates exhibits many modes and dispersion characteristics, which have great influence on fouling detection. The relative distribution of the in-plane and out-of-plane displacement of the mode across the thickness of the plate will determine the sensitivity of the mode to a particular loading condition. By considering the dispersion and multi-mode characteristics of guided waves, an interdigital polyvi- nylidene fluoride （PVDF） transducer is designed to realize the mode selection of gnided waves, and a single a0 mode is used for guided wave detection. Fouling detection experiments are conducted in the laboratory using epoxy adhesive on a thin plate. Using the interdigital PVDF transducer, three fouled areas are detected. Using one of the time-frequency analysis methods, the waveforms are further processed. This also demonstrates the validity of this method of fouling detection.

关 键 词：Lamb waves Interdigital transducer Fouling detection 

分 类 号：TS252.4[轻工技术与工程—农产品加工及贮藏工程]