构建了一种基于多路并行探测提高光子计数关联成像质量的方案,分析了其成像性能,并通过数值模拟验证了其有效性。探讨了探测路数、回波信号平均光子数和辐照散斑场的稀疏度对成像质量的影响。数值模拟结果表明,该方案下的关联成像质量与探测路数成正相关,随着回波信号平均光子数和辐照散斑场稀疏度的增加,成像质量先提升后降低。

The shape and microstructure of the fiber-optic liquid-level sensor head, which was made of two fusion-spliced multimode optical fibers, were experimentally studied by using scanning electron microscope (SEM) technology in order to optimize the performance characteristic of the fiber sensor head. The parabolic profile of the sensor head was found to be better and having length-width ratio from 1.2:1 to 1.3:1. Some other useful possibilities were proposed.

In this paper, we present a three-parametric model using Raman and fluorescence spectroscopy for detection and analysis of esophagus dysphasia and esophagus cancer. The model was set up from more than 1000 samples. And 56 samples were used to test this algorithm of the model prospectively. The serum spectra were excited by laser of the wavelengths 488.0 and 514.5 nm. The apparent differences of auto-fluorescence and Raman spectroscopy were observed for patients compared to the normal: the majority of the fluorescence spectra did not have violent alteration, but three Raman peaks disappeared or were found to be very weak. Moreover, 'Delta lambda' value (red shift of fluorescence peak) and 'alpha'-value (rate of fluorescence intensity) also provide the reference for future research. And I-value (intensity of Raman peak) will decrease with progression of the tumor. The result of spectral analysis is accordance with the clinical diagnosis.

In this paper, laser induced human serum Raman spectra of liver cancer are measured. The differences in serum spectra between normal people and liver cancer patients are analyzed. For the typical spectrum of normal serum, there are three sharp Raman peaks and relative intensity of Raman peaks excited by 514.5 nm is higher than that excited by 488.0 nm. However, for the Raman spectrum of liver cancer serum there are no peaks or very weak Raman peaks at the same positions. To liver cirrhosis, the shape of Raman peak is similar to normal and fluorescence spectrum is similar to that of liver cancer from statistic data. Moreover, the liver fibrosis and liver cirrhosis were studied using the technology of laser-induced fluorescence (LIF). The experiment indicates that the blue shift of fluorescence peak differences between the normal, liver fibrosis and liver cirrhosis were observed. These results have important reference values to explore the method of laser spectrum diagnosis.

用Ar~+激光作为激发光源,检测了血卟啉在水、丙酮和乙醇三种溶液中产生单态氧~1O_2的a~l△g(v=1)→X~3∑_g~-(v=0)跃迁光谱;给出了磷光相对强度(1~O_2的量子产额相对值)与激发光功率、HP浓度及激发光波长的关系;用维生素C针剂作猝灭剂,观察了其对单态氧的猝灭作用。