SPR光谱信号的无基线质心法

为提高角度调制型表面等离子体共振(SPR)传感器的信噪比、分辨率等指标,并减少运算量,在分析固定基线质心法、基于幅值的动态基线质心法的基础上,提出一种确定SPR共振角的无基线质心法。运用SpreetaTM传感器和自行研制的SPR检测仪器,开展多种质量浓度的氯化钠和蔗糖溶液实验,获得SPR光谱数据,并分别采用上述三种质心法进行SPR共振像素计算,得到SPR监控曲线;分析比较三种质心法的运算速度、光源波动敏感度、信噪比和分辨率等指标。结果表明无基线质心法具有运算速度快、不受光源波动影响、信噪比高、分辨率高等特点,能有效提高SPR传感器和检测系统的性能。     

Study on calibration method for the performance index of SPR sensors

Aiming at the problem that there isn’t any standardized calibration method for the performance index of surface plasmon resonance(SPR) sensor,the calibration method for key performance indices of SPR sensor is summarized and proposed based on the comparison of relative methods and definition of each index.Experimental data of sucrose solutions with various concentrations are obtained by the self-building SPR instrument,and then the calibration method is used to determine the performance indices,such as noise,drift,sensitivity,resolution,linearity,dynamic range and reproducibility.Experimental results show that the definition of indices is reasonable,and the calibration method is correct,which has great significance for performance evaluation of SPR sensor.     

基于表面等离子体共振技术的液相色谱检测器研究

针对传统液相色谱检测器通用性与灵敏度不能兼得,本文报道了一种由SPR传感器、微型流通池、检测电路和液相色谱工作站软件组成的新型SPR液相色谱检测器的研制。运用该检测器,结合泵、分析柱和进样器构成液相色谱系统。对木糖、葡萄糖、蔗糖混合溶液进行检测,获得了三者分离图谱。对不同浓度的葡萄糖溶液进行检测,检测限为20μg,线性范围为20～160μg。结果显示SPR液相色谱检测器通用性较强,灵敏度有待进一步提高。