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摘要: }kF*I@:g 'fka?lL 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*aGz8N nC@UK{tVa 背景: &\5%C\0Z< 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。 EMw
biGV 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。 +"3K)9H 图1. RPC Photonics工程漫射体结构及光束投射形状 #vPf$y6jCI u;/<uV3 +8 }p-<a 步骤 ^~DClZ *3h!&.zm 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 tW \q;_DSr Ixr#zt$T-G 图2. RPC Photonics工程漫射体不同类型的散射数据 /rzZU} 3[ 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) e$4$G<8;y 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 qVr?st 例如下所示: (R^Ca7F Sample name: EDF-C1-56 p77 Merging data from file EDF-C1-56 0-0.txt F(;95TB Finished merging RPC data for sample EDF-C1-56 #TD0)C/ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt vFH1hm 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 QmY1Bn?s a. 创建一个新的散射库 u= ydX b. 散射模型命名 f1RX`rXf c. 改变散射模型为“Tabulated BSDF”. 9RnXp&w 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 ) ,H:{twc 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%!N!\ 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, `cpUl*Y= g. 点击OK S)z5=N(Xz 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 X.)D"+xnH (6~~e$j NSDls@m 脚本代码: $LJCup,1" KO&oT#S '#Language "WWB-COM" dH+oV` .Eg[[K_iD Option Explicit M|\C@,F]8 +^V%D!.$@ Sub Main
{U7A&e0eW >o8N@`@VK- 'Cleanup #_4JTGJ ClearOutputWindow() |<w
Z;d 3PRK.vf Print "Merging RPC Photonics BSDF Data Files" IWP[?U= SetTextColor(255,0,0) /+{1;}AT Print "Note: Script should be located in the same folder as the BSDF TXT files." 9/4Bx!~A Print "Note: Do not run this script multiple times without deleting the output file between executions." "6xTh0D
SetTextColor(0,0,0) zR6^rq* {,
zg 'Current directory of this script (should be the same as the text files being merged) I+FQ2\J*H Dim cDir As String X.hVMX2B cDir = MacroDir$ & "\" (g#,AX $+Zj)V( 'Array which will be populated with the list of files to be merged vGI?X#w3 Dim fList() As String, curFile As String UWW_[dJr GetFileList( cDir, fList ) YRs32vVz DgRA\[c Print "" 'qnnZE Print "Files found for merging:" qFg"!w For Each curFile In fList zx=AT Print Chr(9) & curFile P4.snRQ Next N
cnL -k. V.12 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. dRPX`%J Dim nameArray() As String, sampName As String 6n5>{X nameArray = Split(fList(0)," 0-0.txt") [SA$d`B/ sampName = nameArray(0) Ialbz\;F2% Print "" Gw0MDV&[ Print "Sample name: " & Chr(9) & sampName ;'xd8Jf BHEZ<K[U
'Open an output file and write the FRED header data 8
!+eq5S3 Dim outFile As String A3c&VT6Q outFile = cDir & sampName & "_FRED.txt" m-)yQM8 Open outFile For Output As #1 T!pjv8y@R Print #1, "type bsdf_data" Ceco^Mw Print #1, "format angles=deg bsdf=value scale=1" _M9-n 1pHt3Vc(G 'Loop the file list, skip the two header lines and write the remaining data to file K_t!P Dim lineArray() As String, curLine As Long _$YT*o@0J For Each curFile In fList gyAKjLqqpi Print "Merging data from file " & curFile ~lB:xVzn ReadFile( cDir & curFile, lineArray ) 268H!'!\ For curLine = 2 To UBound(lineArray) Ij}k>qO/2 Print #1, lineArray(curLine) ';OZP2 Next ;^Y]nsd Next !
fSM6Vo E2a00i/9Y 'Close the output file D?<R5zp Close #1 Lr}>Md b+3QqbJ[F Print "Finished merging RPC data for sample " & sampName qD?-&>dBWi Print "FRED formatted data file: " & Chr(9) & outFile 0'O*Y
]h+ End Sub XI*cu\7sy 35X4]
t 'Utility function to read the contents of a file into an array of strings. H<bK9k)E Function ReadFile(ByVal fileName As String, _ XP'7+/A ByRef lineArray() As String) As Long BO3%p j,BiWgj$8 ReadFile = -1 iQnIk|8 Dim oFSO As Object XexslzI Set oFSO = CreateObject("Scripting.FileSystemObject") {Y#$ Erase lineArray nax(V ;mYj`/Yj Dim fid As Long D%=FCmL5@= If oFSO.fileexists( fileName ) Then 9X6l`bo' fid = FreeFile() ,@]rvI6x Open fileName For Input As fid 3~&h9#7Ke lineArray = Split(Input(LOF(fid), fid), vbCrLf) !p#+I= Close fid @3@oaa/v End If {f
kP|d Set oFSO = Nothing K=`;D Return UBound( lineArray ) si|DxDx <R>%DD=v^ End Function 4fp]z9Y fX[6
{ Sub GetFileList( ByVal in_dir As String, _ =
rLL5< ByRef in_flist() As String ) t@1bu$y /y<nAGtD& 'Redimension the file list array |-SImxV Erase in_flist 0cxk)l% C0bOPn 'Tracks how many files are found }co*%F{1 Dim fCount As Long Zg#VZg1
2 fCount = 0 3.^Tm+ C ?U;KwS]% 'Recurse directory and search for text files Qso"jYl< Dim f As String |`50Tf\J f = Dir$(in_dir & "*.txt") ZSo#vQ While f <> "" 7^|,l ReDim Preserve in_flist(fCount) o :tz_5 in_flist(fCount) = f HI}9"(t} fCount += 1 n2#Yw}7^,o f = Dir$() :J{| /"== Wend Mx<?c ReDim Preserve in_flist(fCount-1) XA*sBf FNyr0!t, End Sub ;F:~HrxT}
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