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Vol. 156, Issue 9, September 2013, pp. 103-110

 

Bullet

 

Method for Identifying Mechanical Vibration Source Based on Detected Signals by Optical Fiber
 
1 Hongquan QU, 1 Guoxiang LI, 2 Liping PANG

1 College of Information Engineering, North China University of Technology, Beijing, 100041 China

2 School of Aviation Science and Engineering, Beihang University, Beijing 100191, China

2 Tel.: +86-10-82313186, fax: +86-10-82316654

2 E-mail: pangliping@buaa.edu.cn

 

Received: 6 July 2013   /Accepted: 25 August 2013   /Published: 30 September 2013

Digital Sensors and Sensor Sysstems

 

Abstract: A Optical Fiber Vibration pre-Warning System (OFVWS) has an ability to detect and identify vibration signals by using a optical fiber cable lain along with pipes, hence it has been widely applied in some safety fields, such as the pipeline transportation, national defense, military base and so on. In the application of the OFVWS, one of the key issues is to identify harmful mechanical vibration sources quickly and efficiently. In this paper, we analyzed vibration signal produced by mechanical vibration sources and extracted the signal features transmitted by the OFVWS. A conclusion was drawn that most of mechanical vibration sources have an obvious feature of fundamental frequency. Based on this conclusion, we developed a method to detecting and recognizing a mechanical vibration source based on a variation coefficient of fundamental frequency periods. This method is able to accurately judge if the detected vibration signals having a feature of fundamental frequency or not by calculating and analyzing its variation coefficient of fundamental frequency periods. Field test results showed that this method can identify various harmful mechanical vibration sources, and have a high probability of detection and recognition, and a low probability of false alarm.

 

Keywords: Optical fiber sensor, Fundamental frequency, Mechanical vibration model, Variation coefficient.

 

 

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