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摘要: Kterp%J? 8vP:yh@ 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。 UXU!sd ^LaOl+;S 背景: 7*{9 2_M 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。 ry99R|/d1 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。 o>3g<-ul 图1. RPC Photonics工程漫射体结构及光束投射形状 MXQS6F# .W[[Z;D nMz~.^Q- 步骤 Kr;7~`$[ +i %,+3#6 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 m\h. sg& :Fvd?[ 图2. RPC Photonics工程漫射体不同类型的散射数据 ^M51@sXI7 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) C}})dL;( 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 CBj&8#8Z 例如下所示: 1m$< %t.> Sample name: EDF-C1-56 $s[DT!8N Merging data from file EDF-C1-56 0-0.txt Muhq,>!U Finished merging RPC data for sample EDF-C1-56 gy%/zbZx FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt PA=.)8 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 WKHEU)'! a. 创建一个新的散射库 lDBn3U&z> b. 散射模型命名
*jAw c. 改变散射模型为“Tabulated BSDF”. Ng;K-WB\ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) >'qkW$-95 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。 %cPz>PTW@ 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, ;,z[|"y g. 点击OK +N~?_5lv\s 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 >Ei-Spy>Xl #fF~6wopV nWrknm 脚本代码: k!%[W,* <%@S-+D`] '#Language "WWB-COM" {nl]F Oyfc! Option Explicit kX\\t.nH ,g2oqq ? Sub Main :RYh@. |C MKY 'Cleanup a0s6G3J+9 ClearOutputWindow() (3H'!P7|~ . q=sC?D Print "Merging RPC Photonics BSDF Data Files" M- f)\`I SetTextColor(255,0,0) ^t|CD|,K_O Print "Note: Script should be located in the same folder as the BSDF TXT files." 1|+Zmo" Print "Note: Do not run this script multiple times without deleting the output file between executions." ( k@%04c SetTextColor(0,0,0) ]#UyYgPk 6NvdFss'A{ 'Current directory of this script (should be the same as the text files being merged) m'
LRP:9v Dim cDir As String LuLnmnmB cDir = MacroDir$ & "\" %*>ee[^L , `ViFY
'Array which will be populated with the list of files to be merged 9c/&+j Dim fList() As String, curFile As String 8T}Ycm5} GetFileList( cDir, fList ) L_3undy, {5ujKQOcR Print "" r306`)kX Print "Files found for merging:" c<'Pt4LY For Each curFile In fList -Qt>yzD3 Print Chr(9) & curFile q~3dbj Next [&Kn&bdKW ?5%0zMC 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. OOa}+^-j Dim nameArray() As String, sampName As String 4 Ar\`{c> nameArray = Split(fList(0)," 0-0.txt") B/*`u sampName = nameArray(0) dy4!
>zxF Print "" dkz79G}e Print "Sample name: " & Chr(9) & sampName fvW7a8k3 QQ+? J~ 'Open an output file and write the FRED header data -^y$RJC Dim outFile As String M]S&vE{D outFile = cDir & sampName & "_FRED.txt" lP4A?J+Q Open outFile For Output As #1 YKjm_)8]w Print #1, "type bsdf_data" ) o)k~6uT Print #1, "format angles=deg bsdf=value scale=1" Ha U6`IP l9U^[;D 'Loop the file list, skip the two header lines and write the remaining data to file s^
t1T& Dim lineArray() As String, curLine As Long +1 K9R\ For Each curFile In fList Ab]`*h\U Print "Merging data from file " & curFile G8m:]! ReadFile( cDir & curFile, lineArray ) _L?`C For curLine = 2 To UBound(lineArray) PMDx5-{A/t Print #1, lineArray(curLine) QzjLKjl7p4 Next t%<@k)hd~G Next RhJ{#G~:% LuM[*_8 'Close the output file w8|38m Close #1 {b|:q>Be8 ]Zfg~K( Print "Finished merging RPC data for sample " & sampName @O;gKFx Print "FRED formatted data file: " & Chr(9) & outFile 6K/j,e>L End Sub H_RVGAbU ~^U(G As 'Utility function to read the contents of a file into an array of strings. ,S|v>i,@ Function ReadFile(ByVal fileName As String, _ >x(3p@6p ByRef lineArray() As String) As Long w7.I0)MH +="?[: ReadFile = -1 &dqC
=oK] Dim oFSO As Object S7tc Set oFSO = CreateObject("Scripting.FileSystemObject") =WaZy>n}7 Erase lineArray k<mfBNvuo /V66P@[> Dim fid As Long pi>,>-Z If oFSO.fileexists( fileName ) Then Kh)SgJ3B@ fid = FreeFile() 4I"p>FIkY Open fileName For Input As fid xWY%-CWY. lineArray = Split(Input(LOF(fid), fid), vbCrLf) [L.+N@M Close fid Q@]QPpe End If {uO=Wkp~7 Set oFSO = Nothing HPGMR4=ANS Return UBound( lineArray ) g]^@bxdg |1sl>X, End Function 3`ov?T(H PZVh)6f"c Sub GetFileList( ByVal in_dir As String, _ !J 3dlUFRO ByRef in_flist() As String ) 8IErLu } BDW%cs 'Redimension the file list array wS*An4%G Erase in_flist xPFNH`O& 3I87|5V,Z 'Tracks how many files are found ]>E)0<t Dim fCount As Long 5PY,}1` fCount = 0 _*d8:|qw oyQp"'|N 'Recurse directory and search for text files !f
7CN< Dim f As String Hw 7 f = Dir$(in_dir & "*.txt") +!dWQ=W While f <> "" (vX+
Yw ReDim Preserve in_flist(fCount) ^_6.*Mvx in_flist(fCount) = f muMb pF fCount += 1 FerQA9K)x f = Dir$() Z`L-UQJ. Wend Czj]jA(0f ReDim Preserve in_flist(fCount-1) ,e6n3]W8 q*`1<9{H End Sub ~b.C[s *D&(6$[ ^ 11%<bmJ]Q3 QQ:2987619807 aRPpDSR?l
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