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摘要: <(lA
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bv RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 _K~h?
\u AYA{_^#+3 背景: }R['Zoh4I Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 aDNB~CwZZ FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 sg
$db62> 图1. RPC Photonics工程漫射体结构及光束投射形状 a'i
Q(" Q[j| 2U I$xZV?d. 步骤 f)/Z7*Z V|MGG 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 fkzSX8a9} Y7}>yC/GY 图2. RPC Photonics工程漫射体不同类型的散射数据 (G"'Fb6d 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) y d97ys 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 <xy@% 例如下所示: 4!Js=" Sample name: EDF-C1-56 ^&eF916H Merging data from file EDF-C1-56 0-0.txt l/X_CM8y~ Finished merging RPC data for sample EDF-C1-56 AatSN@,~z FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt +NPL.b| 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Lj1l]OD a. 创建一个新的散射库 wX"hUu b. 散射模型命名 Ht
Fr(g\"$ c. 改变散射模型为“Tabulated BSDF”. ~$HB}/ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) m+Ye`] e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 l$;"yVdks f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, I@'[> t g. 点击OK K&L!O3#( 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 X8|H5Y: FQ<-Wc !/is+
xp 脚本代码: JtL>mH 9pp+<c '#Language "WWB-COM" \]tBwa )O1]|r7v Option Explicit A5XMA|2_ ?,vLRq. Sub Main k)p`x"To }
!m43x/& 'Cleanup Z,).)y#B ClearOutputWindow() 6R6Ub
0 G$<(>"Yr~$ Print "Merging RPC Photonics BSDF Data Files" E`IXBI SetTextColor(255,0,0) ;p(h!4E Print "Note: Script should be located in the same folder as the BSDF TXT files." B5lwQp] Print "Note: Do not run this script multiple times without deleting the output file between executions." nh} Xu~#_ SetTextColor(0,0,0) R}&?9tVRR MKHnA|uQ]( 'Current directory of this script (should be the same as the text files being merged) ;,4*uU'vq Dim cDir As String -H-U8/W C cDir = MacroDir$ & "\" #I/P9)4 X{-4w([ 'Array which will be populated with the list of files to be merged Th) Dim fList() As String, curFile As String Y <6|z3 GetFileList( cDir, fList ) CsO!Y\'FY 7~h3B< Print "" "<CM'R Print "Files found for merging:" F]$ Nu For Each curFile In fList m%HT)`>bg Print Chr(9) & curFile 2f,8Jnia Next dN{At- VE|:k:}; 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. noZbsI4 Dim nameArray() As String, sampName As String O=0p}{3l nameArray = Split(fList(0)," 0-0.txt") bfxE}> sampName = nameArray(0) }LUvh Print "" PUdv1__C Print "Sample name: " & Chr(9) & sampName ng1E'c]0@ ?WI v4 'Open an output file and write the FRED header data q*hn5 K* Dim outFile As String W5|{A])N outFile = cDir & sampName & "_FRED.txt" t~+M>Fjm?d Open outFile For Output As #1 =M\yh,s! Print #1, "type bsdf_data" fv;Q*; oC& Print #1, "format angles=deg bsdf=value scale=1" ,1-%C) 14,)JZN 'Loop the file list, skip the two header lines and write the remaining data to file {]CZgqE{ Dim lineArray() As String, curLine As Long (m/:B=K For Each curFile In fList 1-kuK<KR Print "Merging data from file " & curFile 529;_| ReadFile( cDir & curFile, lineArray ) (XZ[-M7 For curLine = 2 To UBound(lineArray) e{)giJY9 Print #1, lineArray(curLine) W|PAI[N Next o@Ye_aM~?Y Next jFSR+mP! OM EwGr( 'Close the output file 1$*8F Close #1 +t7HlAXB# 579Q&|L. Print "Finished merging RPC data for sample " & sampName 8lF9LZ8 Print "FRED formatted data file: " & Chr(9) & outFile [L%Ltmx End Sub mR0`wrt ZU\$x<, 'Utility function to read the contents of a file into an array of strings. WIWo4[( Function ReadFile(ByVal fileName As String, _ ]3,'U(!+ ByRef lineArray() As String) As Long !r/i<~'Bx i\xs!QU ReadFile = -1 #$WnMJ@ Dim oFSO As Object rZI63S Set oFSO = CreateObject("Scripting.FileSystemObject") %`Ce#b()' Erase lineArray (B#FLoK lxn/97rA Dim fid As Long htB2?%S=T If oFSO.fileexists( fileName ) Then ]OpGD5jZ fid = FreeFile() HNZ$CaJh Open fileName For Input As fid E~y8X9HZ) lineArray = Split(Input(LOF(fid), fid), vbCrLf) igu1s}F Close fid qnP4wRpr End If <@J$hs9s Set oFSO = Nothing g~<[;6& |