| 聚合物光栅生物传感器光信号检测滤波电路 |
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| 引用本文： | 赖丽萍,梁德娟,庄其仁.聚合物光栅生物传感器光信号检测滤波电路[J].光学与光电技术,2013,11(1):56-59. |
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| 作者姓名： | 赖丽萍 梁德娟 庄其仁 |
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| 作者单位： | 华侨大学信息科学与工程学院,福建厦门,361021 |
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| 基金项目： | 福建省自然科学基金计划(2011J01353)资助项目 |
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| 摘 要： | 矩形光栅1级和0级衍射效率之比对光栅的凹槽深度敏感,介绍了将其应用于聚合物光栅生物传感器的原理和光栅衍射光信号检测电路系统原理。设计了锁相放大器的信号通道滤波器,获得带宽不大于1kHz的窄带滤波特性;利用相敏检测器(PSD)结合二阶巴特沃思低通滤波器,使等效噪声带宽限制在20Hz以内,避免了工频干扰,实验结果表明系统输出信噪比SNR可达4 000以上。
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| 关 键 词： | 生物传感器 锁相放大器 矩形光栅 光信号检测 |
| 收稿时间： | 2012/9/14 |
Filter Circuits used for Optical Signal Detection in the Polymer Grating Biosensors |
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| LAI Li-ping,LIANG De-juan,ZHUANG Qi-ren.Filter Circuits used for Optical Signal Detection in the Polymer Grating Biosensors[J].optics&optoelectronic technology,2013,11(1):56-59. |
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| Authors: | LAI Li-ping LIANG De-juan ZHUANG Qi-ren |
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| Institution: | (College of Information Science and Engineering,Hua Qiao University,Xiamen 361021,China) |
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| Abstract: | The ratio of the diffraction efficiency of the first diffractive order and zero diffractive order is sensitive to the depth of groove in rectangular gratings. According to the diffractive principle, it can be applied to the polymer grating biosensors. The filter circuits used for optical signal detection in the polymer grating biosensors are introduced. The channel filter of lock-in amplifier is designed to get narrow band filtering properties, whose bandwidth is not more than 1 kHz. By using the phase sensitive detector (PSD) combined with 2nd order low pass Butterworth filter, the equivalent noise bandwidth is limited less than 20 Hz to avoid frequency interference. The experimental results show that the output SNR is higher than 4 000. |
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| Keywords: | biosensor lock-in amplifier rectangular grating light signals detection |
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