文献 | 量子荧光|微型光纤光谱仪-ag贵宾会

this paper reports monitoring fruits maturation using speckle technique. performed measurements aim the assessing of biological inner fruit variation effect on the speckle image. we show that the speckle grain size is both affected by the glucose level inside the fruits and by the chlorophyll content. moreover, the determination of circular polarization degree and circular grain size indicate that a rayleigh diffusion regime gradually becomes predominant in fruits. principal component analysis is used to highlight high correlation between results and strengthen the establishment of speckle as a novel non invasive method to monitor fruits ripening.

research into fingermark enhancement techniques has traditionally used visual comparisons and qualitative methods to assess their effectiveness based on the quality of the developed fingermark. however, with increasing research into the optimisation of these techniques the need for a quantitative evaluative method has arisen. parameters for acceptable fingerprint quality are not well defined and generally encompass clear, sharp edges and high levels of contrast between the fingermark ridges and background material. using these current parameters, a conclusive measurement of fingerprint quality and thus the effectiveness of development techniques cannot be achieved. this study presents a model through which an aspect of fingerprint quality can be objectively and impartially measured based on a relative contrast index, constructed through measuring the reflective intensity of the fingermark ridges against the background material. using a fibre-optic spectrophotometer attached to a microscope with axial illumination, the intensity counts of the ridge detail and background material were measured and a logarithmic contrast index constructed. the microscope and spectrophotometer parameters were experimentally tested using a standard colour resolution chart with known reflective properties. the protocol was successfully applied to four sample groups: black inked fingerprints on white paper; latent fingermarks on white paper developed separately with ninhydrin and physical developer; and fingermarks in blood deposited on white tiles and enhanced with amido black. the contrast indices obtained quantitatively reflect the level of contrast and provide an indication of fingerprint quality through a numerical representation rather than previous qualitative methods. it has been suggested that the proposed method of fingerprint quantification may be viable for application in the forensic research arena as it allows the definitive measurement of contrast to aid the evaluation of fingermark detection and enhancement techniques.

目前, 等离子体发射光谱应用于中频丙酮等离子体的研究鲜有报道。自建大气压氩∕丙酮喷射中频交流放电等离子体装置, 采用h r2000 光纤光栅光谱仪对放电光谱进行记录, 并对实验中的光谱信号进行分析诊断。研究结果说明, 对大气压环境下, 使用氩气为“ 载气” , 对可挥发有机溶剂进行等离子发射光谱分析是一种可行的技术;大气压下丙酮等离子体的活性成分和真空环境下丙酮等离子体产生的活性成分有很大区别, 氧元素对两种气压下等离子体活性成分有很大改变;这种诊断方法对大气压下挥发性有机试剂的等离子体化学反应原理的研究, 有重要的指导意义。此外, 文中展示了大气压下丙酮沉积膜在两种光源下的形貌图, 结果说明在一定实验条件下得到了连续的沉积膜。

采用自制的全息平场凹面光栅集成微型光谱仪, 搭建了微型光谱快速分析测试系统, 实现了雷尼替丁合成中间体中杂质甲醛的快速检测。利用酸性条件下甲醛-mbth-硫酸铁铵体系的显色作用, 通过优化甲醛测定条件, 建立了快速测定甲醛的方法。测定甲醛线性范围为0.04～ 0.20 μg · ml-1(r =0.993 8), 最低检测限达到0.04 μg · m l-1 。通过与uv-2550 岛津光谱仪及美国海洋公司h r-2000 微型光谱仪的对比测试实验, 对所建立的微型光谱检测系统和甲醛检测方法进行了实际测试和可靠性验证, f-检验法检验显示测试结果无显著性差异。实验结果表明微型光谱快速分析测试系统能满足实验分析、工业过程监测和临床医学检验样品的快速、实时检测的需求, 具有巨大的潜在应用市场。