Acceleration is the piezoelectric device, but they operate at much lower frequency (typically tens or hundreds of Hz instead of hundreds of kHz). Both the AE acceleration sensor is used to sense movement. However, perceived motion accelerometer has a wavelength of the order of tens to hundreds of feet. Therefore, the measure the movement of the structure as a whole and not sensitive to small points disorders. The AE sensor test part of the local structure, and is very sensitive to the disorder | APPLICATIONS OF GAS CHROMATOGRAPHY Edited by Reza Davarnejad and Mahboubeh Jafarkhani Applications of Gas Chromatography Edited by Reza Davarnejad and Mahboubeh Jafarkhani Published by InTech Janeza Trdine 9 51000 Rijeka Croatia Copyright 2012 InTech All chapters are Open Access distributed under the Creative Commons Attribution license which allows users to download copy and build upon published articles even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. After this work has been published by InTech authors have the right to republish it in whole or part in any publication of which they are the author and to make other personal use of the work. Any republication referencing or personal use of the work must explicitly identify the original source. As for readers this license allows users to download copy and build upon published chapters even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. Notice Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published chapters. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials instructions methods or ideas contained in the book. Publishing Process Manager Daria Nahtigal Technical Editor Teodora Smiljanic Cover Designer InTech Design Team First published March 2012 Printed in Croatia A free online edition of this book is available at Additional hard copies can be obtained from orders@ Applications of Gas Chromatography Edited by Reza Davarnejad and Mahboubeh Jafarkhani p. cm. ISBN 978-953-51-0260-1 INTECH open .
