本文選題：角膜地形圖儀　切入點(diǎn)：投射照明系統(tǒng)　出處：《光學(xué)精密工程》2017年03期 　論文類型：期刊論文

【摘要】：為了實(shí)現(xiàn)檢測角膜的表面形貌,設(shè)計了基于Placido盤的角膜地形圖儀投射照明系統(tǒng)。首先,根據(jù)人眼的明視覺光譜光視效率、CCD元件光譜響應(yīng)曲線以及儀器對面光源照度與發(fā)光均勻性的要求,進(jìn)行了LED背光源設(shè)計。其次,根據(jù)角膜地形圖儀檢測原理,比較了球形和橢球形Placido盤的利弊,在背光源照明下分析了這兩種面型Placido盤的光照情況。分析顯示,橢球形Placido盤的最大輻照度優(yōu)于球形盤。采用反向逆推法建立數(shù)學(xué)模型,利用Matlab軟件求解確定了盤上黑白條紋環(huán)的分布。最后,根據(jù)上述設(shè)計參數(shù)進(jìn)行了Placido盤加工,搭建了投影照明實(shí)驗(yàn)裝置,并利用標(biāo)準(zhǔn)模型眼對所獲得的投射照明系統(tǒng)進(jìn)行檢測。實(shí)驗(yàn)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,采用所設(shè)計的24環(huán)橢球型Placido盤成像到CCD上的黑白條紋環(huán)滿足等間隔均勻分布的要求,檢測精度可達(dá)到0.05m~(-1),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、高精度的要求。
[Abstract]:In order to detect the surface morphology of cornea, the projection illumination system of corneal topography based on Placido disc is designed. According to the spectral response curve of LED component and the requirement of illumination and uniformity of light source on the other side of the instrument, the design of LED backlight source is carried out. Secondly, according to the detection principle of corneal topography, The advantages and disadvantages of spherical and ellipsoidal Placido disks are compared, and the illumination of these two surface Placido disks under backlight illumination is analyzed. The results show that the maximum irradiance of ellipsoidal Placido disks is better than that of spherical disks. The distribution of black and white stripe rings on the disk is determined by using Matlab software. Finally, according to the above design parameters, the Placido disk is machined, and the experimental device of projection illumination is built. The projective illumination system was detected by standard model eyes. The experimental results show that: the main wavelength of 625nm AlGalnP red LED surface illumination, Using the designed 24-ring ellipsoidal Placido disk to image the black and white stripe rings on CCD to meet the requirements of uniform distribution at equal intervals, the detection accuracy can reach 0.05mT-1, which can meet the requirements of high contrast and high precision of corneal topography for projection lighting system.
【作者單位】： 浙江工業(yè)大學(xué)理學(xué)院;浙江工業(yè)大學(xué)計算機(jī)學(xué)院;
【基金】：浙江省重大科技專項資助項目(No.2011C11048)
【分類號】：TH786;R770.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 余錦華;季春紅;李添捷;田磊;黃一飛;汪源源;鄭永平;;正常角膜和圓錐角膜的特征提取[J];光學(xué)精密工程;2015年10期

2 孫延奎;;光學(xué)相干層析醫(yī)學(xué)圖像處理及其應(yīng)用[J];光學(xué)精密工程;2014年04期

3 鄭浩;隋成華;王河林;魏高堯;姚鋮;;角膜地形圖儀中調(diào)焦函數(shù)的選取及搜索方法[J];光學(xué)儀器;2013年03期

4 韓軍;李建軍;鄧軍;邢艷輝;于曉東;林委之;劉瑩;沈光地;;高亮度AlGaInP紅光發(fā)光二極管[J];光電子.激光;2008年02期

5 張運(yùn)海,沈建新,廖文和;準(zhǔn)分子激光矯正復(fù)性近視散光的屈光學(xué)機(jī)理及應(yīng)用[J];光學(xué)精密工程;2003年03期

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

1 韓婷婷;滕妍;樊秋陽;;眼周脈沖治療儀對眼底熒光血管造影術(shù)后不良反應(yīng)的作用評價[J];中國醫(yī)學(xué)裝備;2017年04期

2 隋成華;沃圣杰;徐丹陽;高楠;張玉民;;角膜地形圖儀中Placido盤及投射照明系統(tǒng)的設(shè)計與實(shí)現(xiàn)[J];光學(xué)精密工程;2017年03期

3 劉曉梅;李夢月;周敏;;光學(xué)相干層析成像技術(shù)發(fā)展及應(yīng)用[J];山東農(nóng)業(yè)工程學(xué)院學(xué)報;2017年03期

4 徐效文;楊志剛;;光學(xué)相干層析醫(yī)學(xué)圖像分割研究現(xiàn)狀[J];中國醫(yī)學(xué)物理學(xué)雜志;2016年07期

5 張志長;吳z，

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