The Detection Of Simulated Biology Tissue

The photo-acoustics (PA) techniques have been widely applied in many fieldswith the development in more than one century. By the time of laser come to use, thePA techniques whose application range enlarged from gas to liquid and solid hadbecome an important tool for material detection and analysis. Much experimental andtheoretical work has been reported in the literature to demonstrate the PA imaginggain rapider advance.The research progress about PA techniques was introduced at the first of the thesis.Secondly, the theory of PA effect and the framework of Laser Induced SingleTransducer Photoacoustics Tomography (LIPAT) System were explained in detail.Thirdly, some factors that would influence the spatial resolution of the reconstructionfigure were discussed and two kinds of the reconstruction algorithm in common use inthe field of photo-acoustics tomography (PAT) were introduced. Fourthly, the theoryof PAT was illuminated. The facture and speciality of the sample, the concreteexperimental process and the signal figure and reconstruction figure were introduced.Then the opinion that different central frequency and bandwidth transducer should beapplied to detect sample with various volume is proved. At the last of the thesis, weconcluded the work in master period and direct the future work.In the experiment of LIPAT system detection and tomography of the simulatedbiology tissue, the solid state Q-switch Laser and broad band transducer were used.The measurement result had good signal/noise rate and high spatial resolution whichwas 0.2~0.4mm and could reflect the inner structure of the sample factually. All ofthese made well basis for the future detection to the biology tissue.