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摘要: `Jon^&^;| FDO$(& RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 ^0&
?e!mv}B_ 背景: OX)[?1m8 Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 @,v.Y6Ge FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 L(eLxw e% 图1. RPC Photonics工程漫射体结构及光束投射形状 wloQk(T<W &p#.m"Oon V@Fj!/ 步骤 Q+'QJ7fw'| 6N'v`p8 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 ojZvgF c2<JS:!*
图2. RPC Photonics工程漫射体不同类型的散射数据 F2RU7o'f. 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 3 ]}wZY0 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 G4eY}3F7,4 例如下所示: P mgTTI Sample name: EDF-C1-56 x*uQBNf= Merging data from file EDF-C1-56 0-0.txt E%6}p++ Finished merging RPC data for sample EDF-C1-56 n[pW^&7x FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt %$L!N-U6 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +\n8##oAI a. 创建一个新的散射库 Fm3B8Int b. 散射模型命名 V/}g'_E c. 改变散射模型为“Tabulated BSDF”. 8 P=z"y 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 ) ]%VR Nm 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。 h"{Z%XPX# 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, c31k%/. g. 点击OK m.A_u7D@ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 J}cqBk> kG>d^K Cj x(Z] 脚本代码: ki[Yu+';} 4 u!)QG '#Language "WWB-COM" Hjm >F~]r$G Option Explicit {@c)!%2$ \]eB(&nq Sub Main QK3j.Ss syYe0~ 'Cleanup ErNL^Se1 ClearOutputWindow() se1\<YHDS S-\;f jh Print "Merging RPC Photonics BSDF Data Files" b+.P4+ SetTextColor(255,0,0) 8f37o/L Print "Note: Script should be located in the same folder as the BSDF TXT files." '% $)"g]/# Print "Note: Do not run this script multiple times without deleting the output file between executions." 2}P?N SetTextColor(0,0,0) b]Xc5Dp{ 3~7X2}qU 'Current directory of this script (should be the same as the text files being merged) t_PAXj Dim cDir As String I8C(z1(N cDir = MacroDir$ & "\" '
?3e 1 7LM?<lp] 'Array which will be populated with the list of files to be merged GDgq
4vfj Dim fList() As String, curFile As String 8MH ZWi GetFileList( cDir, fList ) {uQp$` qMrBTq[ Print "" 9K\A4F} Print "Files found for merging:" SW
^F For Each curFile In fList B=mk@gX,G Print Chr(9) & curFile 1I*b7t Next _{fh/{b1 M7|k"izv 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. o+o'!) Dim nameArray() As String, sampName As String j`GL#J[wqQ nameArray = Split(fList(0)," 0-0.txt") b'Scoa7@' sampName = nameArray(0) t7"vAjZU Print "" y Q_lJIX Print "Sample name: " & Chr(9) & sampName lj{J w.t zoUM<6q 'Open an output file and write the FRED header data #-wtNM%1# Dim outFile As String }i7Gv K<[: outFile = cDir & sampName & "_FRED.txt" FOA y'76p Open outFile For Output As #1 iB =R Print #1, "type bsdf_data" &jh'B , Print #1, "format angles=deg bsdf=value scale=1" 6tC0F= Bw]Y71 'Loop the file list, skip the two header lines and write the remaining data to file ~|_s2T Dim lineArray() As String, curLine As Long 6 6G$5 For Each curFile In fList UQmdm$. Print "Merging data from file " & curFile aXAV`%b ReadFile( cDir & curFile, lineArray ) YY\$lM For curLine = 2 To UBound(lineArray) }0&@J'< Print #1, lineArray(curLine) Bg"KNg Next 2UPqn#.3 Next MCBZq\c {s8v0~ 'Close the output file 8CR b6 Close #1 TC7Rw}jF ,P&.qg i=( Print "Finished merging RPC data for sample " & sampName HzcI2
P`| Print "FRED formatted data file: " & Chr(9) & outFile hmfO\gc}y End Sub sEQA C9M noali96J 'Utility function to read the contents of a file into an array of strings. D<-MbK^S Function ReadFile(ByVal fileName As String, _ a^U)2{A*f ByRef lineArray() As String) As Long ?Vy%<f$ VI{!ZD] ReadFile = -1 8T&.8r Dim oFSO As Object MGt[zLF9 Set oFSO = CreateObject("Scripting.FileSystemObject") S?ypka"L Erase lineArray oa4{s&db- C,2k W`[V Dim fid As Long nH6Ny If oFSO.fileexists( fileName ) Then :qfP>Ok fid = FreeFile() ak:Y<} Open fileName For Input As fid JDTlzu1hR lineArray = Split(Input(LOF(fid), fid), vbCrLf) %XX(x'^4 Close fid kj$Ks2!W End If T1\LS*~! Set oFSO = Nothing #le1
^
<w7 Return UBound( lineArray ) tZW2TUM] N-
!>\n End Function :gD=F &V p_^Jr*Mv Sub GetFileList( ByVal in_dir As String, _ /$w,8pV= ByRef in_flist() As String ) yK1@`3@? 3`%]3qd} 'Redimension the file list array 4=BIYC"Lu Erase in_flist PV[Bq t fV b~j ; 'Tracks how many files are found _>b=f Dim fCount As Long d`}t!]Gg fCount = 0 iJ&*H)}^ Aoi) 11> 'Recurse directory and search for text files <_o).hE{ Dim f As String 'AU:[eyUV f = Dir$(in_dir & "*.txt") /0.m|Th'm While f <> "" $,@PY5r ReDim Preserve in_flist(fCount) DJ zJ$Q in_flist(fCount) = f l2Gtw*i_I fCount += 1 YadG05PDe f = Dir$() kH.e"e Wend (_9 u< ReDim Preserve in_flist(fCount-1) ^k*h -:$#koW End Sub 9;ZaL7> -Lo3@:2i x6qQ
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