| LED芯片检测系统的噪声分析及信号处理研究 |
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| 引用本文： | 伍会娟,文玉梅,李平,吴敬玉,徐庆.LED芯片检测系统的噪声分析及信号处理研究[J].传感技术学报,2009,22(8). |
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| 作者姓名： | 伍会娟 文玉梅 李平 吴敬玉 徐庆 |
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| 作者单位： | 重庆大学光电工程学院,光电技术及系统教育部重点实验室,重庆,400044 |
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| 基金项目： | 国家自然科学基金资助项目，重庆市科技攻关重大项目资助 |
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| 摘 要： | 分析了LED芯片非接触检测系统噪声信号的功率谱,研究了噪声信号的抑制方法.针对现有检测系统存在检测信噪比低的不足,提出对交变电压信号进行相关检测,采用相关检测后,检测系统的信噪比可以提高20 dB以上.实验结果与仿真结果吻合.该研究对于改进检测系统的性能以满足对多种芯片的正确检测有重要意义.
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| 关 键 词： | LED芯片 功率谱 信噪比 相关检测 |
Study on signal processing and noise analysis for LED chip detection system |
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| WU Huijuan,WEN Yumei,LI Ping,WU Jingyu,XU Qing.Study on signal processing and noise analysis for LED chip detection system[J].Journal of Transduction Technology,2009,22(8). |
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| Authors: | WU Huijuan WEN Yumei LI Ping WU Jingyu XU Qing |
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| Abstract: | The noise power spectra of the non-contact detection system for LED chips and the noise suppression methods are discussed. As the detection system has the deficiency of low signal-to-noise ratio, the alternating signal is processed by the method of correlation detection. By using this method, the signal-to-noise ratio of the system can be increased by 20dB or more. The experimental results and simulation results are well in agreement with each other. This is very important for improving the system performance on correctly detecting more kinds of chips. |
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| Keywords: | LED chip power spectrum signal-to-noise ratio correlation detection |
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