一种可同时实现振幅谱与相位谱测量的光声光谱系统  

Photoacoustic Spectroscopy System with Amplitude Spectrum and Phase Spectrum Measurement Functions

作　　者：余荣[1] 江月松[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《光学学报》2014年第2期290-296,共7页Acta Optica Sinica

基　　金：国家自然科学基金(41140035)

摘　　要：设计了一套可同时测量光声振幅谱与相位谱的光声光谱系统。该系统优化了传统的气体一微音器光声光谱系统，增加了相位测量功能，实现了从紫外到近红外区（350～1000nm）的连续波长扫描，测量的最小步进波长为0．1nm，频率调制范围为10～2000Hz。采用虚拟仪器软件LabVIEW，可通过计算机实现仪器控制、实验参数设置、数据自动采集和处理。LabVIEw程序的前面板能动态监控实验过程并实时显示光声振幅谱和相位谱。利用Ho2O3对系统进行鉴定，测得的归一化光声振幅谱与文献结果一致。用该系统研究了喜树碱与羟丙基一口一环糊精的包合物，实验结果显示将光声相位谱与振幅谱相结合，可以获得样品更丰富的信息。A photoacoustic spectroscopy system which can measure the photoacoustic amplitude spectrum and phase spectrum simultaneously is constructed. Based on the conventional gas-microphone system, the phase measurement function is added to the system. The hardware configuration of the system is also optimized. It can scan wavelengths continuously from ultraviolet （UV） to near-infrared （NIR） regions within the range of 350 - 1000 nm with the minimal step length of 0.1 nm and the modulation frequency range of 10 -- 2000 Hz. Using the virtual instrument software LabVIEW, the computer in the system can control instruments, set the experimental parameters, acquire and process data automatically. The front panel of the LabVIEW program can monitor the experiment dynamically and obtain the real-time spectra of both photoacoustic amplitude and photoacoustic phase. The system is evaluated with Ho2 O1, and the normalized photoacoustic amplitude spectrum is consistent with the photoacoustic spectra reported by the existing literatures. The inclusion of camptothecin and nydroxypropyl-9-cyclodextrin is studied by the system, and the experimental results show that more information of the same sample can be obtained when combines photoacoustic phase spectrum with photoacoustic amplitude spectrum,

关 键 词：光谱学 吸收光谱 光声光谱仪 LabVIEW 光声相位 虚拟仪器 

分 类 号：TH744.12[机械工程—光学工程]