摘要
为了进一步提高相位调制型表面等离子体共振(SPR)测量技术的分辨率,从相差信号解调算法方面进行了优化。基于马赫-曾德尔干涉仪结构的相位调制SPR系统中,携带传感信息的p光干涉信号与进行参考的s光干涉信号间存在着相位差。使用光电探测器和数据采集卡将两路干涉光信号采集到PC机,再结合数学计算理论和信号处理原理,最终通过设定逻辑条件选取出较理想的波形、运用锁相的思想对参与解调的光信号进行锁定、利用信号处理原理对2路光信号进行相应的处理,分析了2路干涉光在同一时刻的相位差异。基于该相差信号解调算法,一段时间内相位差异的起伏为0.006°,实现了4.7×10-7RIU(RIU表示单位折射率)分辨率的折射率测量。
In order to improve the resolution of phase modulated surface plasmon resonance （SPR） measurement technology. The signal processing technology is optimized. In the differential phase SPR biosensor based on Mach- Zehnder configuration, the SPR phase can be extracted by comparing the phase difference between the interference signals of p-polarization and the reference signals of s-polarization. The 2-path interference optical signal is recevied by computer. According to the mathematical theory and signal processing knowledge, select and processing the interference optical signals. The phase difference of 2-path signal is analyzed at the same time. In the signal processing technology, the phase difference of ups and downs is 0.006°, and the sensitivity limit is 4.7×10^-7 RIU.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2015年第6期273-278,共6页
Chinese Journal of Lasers
基金
国家自然科学基金(61137005
11474043)
中央高校基本科研业务费专项资金(DUT14ZD211
DUT14LAB16)
国家教育部高等学校博士点基金(SRFDP 20120041110040)
