本文選題：角膜地形圖儀 + 背光系統(tǒng)��； 參考：《浙江工業(yè)大學(xué)》2016年碩士論文

【摘要】：在測量人眼角膜地貌方面角膜地形圖儀發(fā)揮了很大的作用,并成為各大醫(yī)療機構(gòu)指定的檢測儀器。通過該設(shè)備,臨床醫(yī)學(xué)可獲得大量的先驗信息,為一套完整的眼部手術(shù)計劃提供了安全保障。市面上,在眾多的角膜地形圖儀相關(guān)產(chǎn)品中,以Placido盤原理作為主要技術(shù)的角膜地形圖儀,在其對人眼角膜進行檢測的過程中,對背光系統(tǒng)和機械結(jié)構(gòu)的穩(wěn)定性要求極高。本人對以Placido盤原理為技術(shù)依托的角膜地形圖儀進行了研究,研究內(nèi)容包括結(jié)構(gòu)和背光系統(tǒng)的設(shè)計。首先,在對角膜地形圖儀工作原理的充分了解的前提下,對其各個部件的功能做了充分的分析,利用三維制圖軟件UG和SolidWorks對其進行了外形結(jié)構(gòu)設(shè)計,最終設(shè)計出兩款結(jié)構(gòu)方案。通過對比,最終選取了在外形結(jié)構(gòu)設(shè)計上平面使用比較多的一款設(shè)計進行研究分析。在結(jié)構(gòu)設(shè)計的過程中,UG主要用于外形結(jié)構(gòu)的設(shè)計,而Solid Works主要用于二維圖紙的生成,最終通過加工生產(chǎn)出樣品。其次,在對角膜地形圖儀的工作原理和結(jié)構(gòu)充分了解之后,對背光系統(tǒng)中的漫反射材料,LED背光源,Placido盤面型環(huán)的分布以及LED光源的驅(qū)動電路進行了設(shè)計,并且在實驗上對其加工工藝與系統(tǒng)構(gòu)建完成了實現(xiàn)。所獲得的投射照明系統(tǒng)實驗結(jié)果表明:在主波長為625nm的AlGalnP紅色LED面光源照明的情況下,采用橢球面型Placido盤,成像到CCD上的黑白條紋環(huán)滿足了等間隔的均勻分布,環(huán)寬平均值為0.202mm,標(biāo)準(zhǔn)差為0.00473,Placido盤黑白條紋處的光強對比度達到25.7,以及光照強度均勻性可達91.6%。經(jīng)過測試確定該系統(tǒng)的檢測精度高達0.02D,較好地滿足了角膜地形圖儀對投射照明系統(tǒng)的高對比度,高均勻性及高精度的要求。
[Abstract]:Corneal topography has played an important role in the measurement of human corneal topography and has been designated as a testing instrument by major medical institutions. Through this device, a large amount of prior information can be obtained in clinical medicine, which provides a safety guarantee for a complete ophthalmic operation plan. In the market, among the related products of corneal topography, the principle of Placido disc as the main technology of corneal topograph, in the process of detecting human cornea, the stability of backlight system and mechanical structure is very high. In this paper, based on the principle of Placido disc, a corneal topographic instrument is studied, including the design of structure and backlight system. First of all, on the premise of fully understanding the working principle of corneal topography, the function of each part of corneal topography is fully analyzed, and the shape and structure of the instrument are designed by using 3D mapping software UG and SolidWorks, and finally two structural schemes are designed. Through comparison, we select a design which is used more frequently in the design of shape and structure to carry on the research and analysis. In the process of structural design, UG is mainly used in the design of shape structure, while Solid Works is mainly used in the generation of two-dimensional drawings, and finally samples are produced by processing. Secondly, after fully understanding the working principle and structure of the corneal topography instrument, the distribution of the LED backlight ring and the driving circuit of the LED light source are designed. In the experiment, the process and system construction are realized. The experimental results of the projective illumination system show that under the illumination of the AlGalnP red LED surface light source with the main wavelength of 625nm, the equal-spaced uniform distribution of the black and white stripe rings on the CCD can be obtained by using the ellipsoidal Placido disk. The average ring width is 0.20mm, the standard deviation is 0.00473g Placido disk, the contrast of light intensity is 25.7 at the black-and-white stripes of Placido disk, and the uniformity of light intensity can reach 91.6. The accuracy of the system is as high as 0.02D, which can meet the requirements of high contrast, high uniformity and high precision of corneal topography.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TH786

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