This paper presents the development of a cost-effective precision fiber Bragg grating (FBG) interrogation system using long-wavelength vertical-cavity surface-emitting laser (VCSEL). Tuning properties of a long-wavelength VCSEL have been studied experimentally. An approximately quadratic dependence of its wavelength on the injection current has been observed. The overall design and key operations of this system including intensity normalization, peak detection, and quadratic curve fitting are introduced in detail. The results show that the system achieves an accuracy of 1.2 pm with a tuning range of 3 nm and a tuning rate of 1 kHz. It is demonstrated that this system is practical and effective by applied in the FBG transformer temperature monitoring.

将压缩感知(CS)理论应用于荧光显微成像，设计搭建了一套新型的显微成像系统。使用液晶光阀实现待测图像到随机光斑的线性投影，以单点探测进行荧光信号采集，结合CS信号重构理论得到样品图像。采样数远低于Nyquist-Shannon定理要求的次数，成像过程无需扫描，系统结构简单。相对于传统的更换滤光片和光栅扫描成像的光谱成像模式，该系统仅需使用光谱仪采集信号、对光谱分波段计算即可得到荧光样品的多光谱图像。荧光显微成像过程中存在荧光衰减的影响，实验中对数据进行强度归一化预处理，结果表明该处理方法有效消除了荧光衰减对图像重构的影响。

利用一台小型Nd:YAG调Q激光器,在常压大气环境下诱导激发标准岩石等离子体,通过分析微光谱仪收集记录的等离子体发射光谱来定量分析样品中部分元素含量。选择Si元素作为内标元素,根据分析线与内标线的相对强度比,分别对岩石中的Mg元素和Ca元素建立不同的定标曲线。在实验条件相同且无光谱干扰的条件下,元素含量比的对数值与光谱线总强度比的对数值之间有很好的线性关系,其定量分析曲线的拟合度R最小值为0.996,测得相对标准偏差(RSD)的最大值为6.5%。研究结果表明,利用强度归一化法定量分析岩石主要元素含量在一定程度上可以提高测量准确度。