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A precise measurement of the applanated diameter of the ocular cornea with the optical probe is very important in applanation tonometry.A novel optical probe with a common path configuration is presented.The optical probe mainly consists of a cone-shaped prism and a photodetector.The former serves as a measuring body touching the ocular cornea to shape the area to be measured,and the latter converts the quantity of the luminous flux returning from the cone-shaped prism into one electronic current signal.Laboratory experiments are carried out on a simulated eyeball,followed by an enucleated porcine eyeball specimen.Experimental results show that there is a significant rise of the normalized variational current with increasing the applanation diameter of the ocular cornea,and the sensitivity is 0.2111/mm with an error of 0.00263/mm.Measurements of the normalized variational current on the porcine eyeball have good agreement with those on the simulated eyeball. 相似文献
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壳聚糖固载化β-环糊精的制备、表征及其性能研究 总被引:8,自引:0,他引:8
用苯甲醛保护氨基的Schiff碱型壳聚糖和环氧氯丙烷反应的水解产物与β 环糊精(β CD)在碱性条件下反应,制备了一种新型壳聚糖固载化β 环糊精吸附剂(CS CD).用红外光谱(IR)和X 射线衍射技术(XRD)对其结构进行了表征.该吸附剂中环糊精的表观固载量为25.8μmol·g-1.CS CD对环境污染物对苯二酚有一定的吸附作用,其饱和吸附量为469.82μmol·g-1. 相似文献
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像差是衡量光学仪器成像质量的主要指标,在眼科临床波前像差检测对视觉质量评估具有重要作用。本文介绍了波前像差的基本理论,基于Zernike多项式通过仿真分别给出人眼1-4阶共14项波前像差图,可为教学服务,也可为临床医师提供科学参考。 相似文献