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Study on Source Feedback and Control Technology for Measuring Rail Surface Abrasion System

Author: LiZuoFang
Tutor: ShaoShuangYun
School: Beijing Jiaotong University
Course: Optical Engineering
Keywords: Rail surface scratches Peak detection Light source feedback
CLC: TP274
Type: Master's thesis
Year: 2011
Downloads: 37
Quote: 2
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Abstract


Has the most important basic role of rail in the rail transport system , it support and guide the trains running . The quality and degree of wear of the rail has a direct impact on the safety of the entire railway running . Therefore , the study of the rail surface abrasions dynamic detection method has important practical significance for ensuring the safety of railway operations . This paper focus on the lighting source the rail surface abrasions detection system feedback control technology to design a feedback signal extraction method to optimize the light source adjustment algorithm to improve the detection system adaptability to external light intensity changes . Compared with the original light source detection system feedback technology to increase the light intensity can downshift median be changed in steps , so that the brightness of the LED light source , an effective solution to the original system can downshift fewer bits , eliminating LED light source stroboscopic phenomenon . The main work of this paper include : 1 , the stroboscopic phenomenon in the analysis of the rail surface abrasions optical detection system based on feedback control system for the original lighting source , LED light source , the proposed lighting source signal peak detection method . Improved light source feedback control circuit , the peak signal acquisition lighting source can be quickly and efficiently , and laid the foundation for the source of light intensity control . 2 , light source feedback control circuit and the corresponding algorithm design , the preparation of a viable and effective SCM process . STC12C2052AD microcontroller detection system stable dimming lighting source , effectively avoid the phenomenon of stroboscopic LED light source , to ensure the effective operation of the light source in the image is too strong or light exposure feedback control system , improve the entire detection the adaptability of the system outside interference light .

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