摘要
针对角度检测型表面等离子共振传感器结构复杂,不易于实现在线测量的特点,基于表面等离子共振(SPR)原理,提出了采用双LED进行差分光强检测折射率变化的方法。设计了参考光路,可以消除光源波动带来的影响。理论分析及实验表明,这种方法比单LED光强检测方法的灵敏度提高了近1倍。由于没有使用角度检测装置及光谱仪,易于实现仪器的小型化。
The structrue of surface plasmon resonance sensors based angle measurement is complex and it is difficult to achieve on-line measurement.Based on surface plasmon resonance principle,a method of differential detection for refractive changes with light intensity is presented and two LEDs are used.Reference light path is designed to eliminate the light fluctuation.Theoretical analysis and experimental results show that the sensitivity of this method is twice as that of single-LED light intensity detection method.It is convenient to realize instrument miniaturization.Angle detection device and Spectrometer are not used in the system,and the system is potable and compact.
出处
《应用光学》
CAS
CSCD
北大核心
2010年第4期529-532,共4页
Journal of Applied Optics
基金
国家高技术研究发展计划(863计划)项目(2007AA10Z239)
关键词
表面等离子体共振
差分检测
参考光路
surface plasmon resonance
differential detection
reference light path
