光致化学反应的适时光声图像构建方法研究

Solid chemical reaction mainly reacted at the solid-solid interface.It was important to understand the characteristics of chemical reaction at the interface,which would help us to realize the solid chemical reactive mechanism,to analyse and evaluate the fatalness of reactivity solid materials.The problem was that the there was few useful analytical technology for detecting chemical reaction activity at the micro area of solid-solid interface.On the base of chemical enhanced photoacoustics, time-resolved photoacoustics and probe scan image,time-resolved photoacoustic image construction for photoinduced reaction and key techniques would be researched. Researching photoacoustic characteristics and mechanism, it will be gotten that pulsed photoacoustic model for photoinduced chemical reaction and chemical kinetic solution method based on chemical reaction enhanced photoacoustics. The space resolution, precision, and noise in the signal will be resolved by the technologies of planar photo probe scaning, transient weak signal analysis and the compression of laser beam probe.The micro images of chemical reactive activities and the analyzing method will be the realised by image construction of relation between pixel and filter.The results of this research will be applied on the analysis and evaluation of the reactive solid chemical materials. The results will improve the understanding of solid ractive mechanism and the security evaluation of hazard materials. It also will be usefull and important to fundmental research and envalue of activity for solid reaction and dangerious materials.

固相化学反应主要发生在固相界面区，掌握固相界面的化学反应特性对认识固相化学反应机理，分析可反应性固体物质的反应活性和评估危险性具有重要的作用，但是目前固相界面化学反应活性的微区分析技术非常缺乏。本项目在化学反应增强光声原理、适时光声技术和探针扫描成像技术等基础上，开展光致化学反应的适时光声图像构建方法和关键技术研究。通过对激光引发化学反应的光声特性、规律和机理研究，建立光致化学反应的脉冲光声模型和基于化学反应增强光声的化学动力学解算方法。采用纳米尺度的二维探针扫描技术、光纤探针光束压缩技术和瞬态微信号分析技术解决信号测量的空间分辨率、精度和噪声问题。采用扫描像素点与滤波器关联法和图像增强方法构建基于化学反应增强光声的显微图像和化学动力学分析方法。研究最终用于固相化学反应分析、反应性固体化学物质活性分析和危险性评估，对固相化学反应微区动力学分析和危险物质评估具有重要的意义和应用价值。

光声光谱成像技术已经应用于微观无损检测，这种技术的前提是激励激光不能导致样品发生物理和化学性质变化。激光能量超过样品发生物理和化学性质变化的临界值时，将形成有别于传统光声信号的反应性光声信号。反应性光声信号包含了样本发生性质变化的信息。通过信号分离和信号解算可以获得激光引发化学反应的动力学参数，并且通过扫描成像技术获得类似形貌图像分析的微区化学动力学显微图像。这一新图像分析技术的核心是信号分离和信号解算。该项目针对光致化学反应的适时光声图像构建的关键技术，开展了信号分离、适时光声与化学反应动力学关联解算方法和化学反应增强的适时光声图像构建方法研究，建立了基于光纤探针扫描成像原理的反应性光声光谱扫描成像实验系统，又称为反应性光声扫描光学显微镜（Reactivity Photoacoustic Scanning Optical Microscope, RPASOM），掌握光纤探针的制备方法，完成光纤探针的激光光束压缩特性和规律分析，提出了光声分离和光声解算模型及方法，完成了项目的研究内容。以上研究成果为RPASOM分析技术的进一步完善和应用奠定了理论和实验基础。