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摘要: 3 #8bG( FZvh]ZX 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。 SBf8Ipe #~_ZG% u 背景: GOKca%DT= 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。 Ft<6`C 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。 m-<"`:+ 图1. RPC Photonics工程漫射体结构及光束投射形状 !-cO0c! F}f/cG<X ii3{HJ*C 步骤 tdCD!rV`{ 1}7Q2Ad w 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。 ;JD/4: "^Ax}Jr 图2. RPC Photonics工程漫射体不同类型的散射数据 n$*e( 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 4N!Eqw 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 lpy(un 例如下所示: KW&vX%i(. Sample name: EDF-C1-56 (GeOD V?U Merging data from file EDF-C1-56 0-0.txt 0qCx.<"p8# Finished merging RPC data for sample EDF-C1-56 qg`8f? FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^Fn~@' 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 R0WI s:k2 a. 创建一个新的散射库 >" &&,~ b. 散射模型命名 `|rr<Tsy\ c. 改变散射模型为“Tabulated BSDF”. g'%^-S ] d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) nNEIwlj; e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 V-7A80!5 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, |z+K]R8_ g. 点击OK ~+~^c| 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 fF|m~#y J"$Y`; >Oz~j>jL 脚本代码: O>M4%p OgOs9=cE{ '#Language "WWB-COM" f]*TIYicc O0~Qh0~l Option Explicit 7`G
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r Sub Main `J26Y"]P \Wn0,%x2 'Cleanup TwT@_~IM ClearOutputWindow() 8rNRQOXOa }vXf}2C Print "Merging RPC Photonics BSDF Data Files" H!81Pq~ SetTextColor(255,0,0) n a3st*3V_ Print "Note: Script should be located in the same folder as the BSDF TXT files." 2Sha&Z*CE Print "Note: Do not run this script multiple times without deleting the output file between executions." FRR`<do5$, SetTextColor(0,0,0) )Bb:?!EuEH Q2 S!}A 'Current directory of this script (should be the same as the text files being merged) ^h5h kIx0 Dim cDir As String A4mnm6Tf cDir = MacroDir$ & "\" OngUZMgdb xV+cX*4h 'Array which will be populated with the list of files to be merged +*')0I Dim fList() As String, curFile As String LPRvzlY= GetFileList( cDir, fList ) VS\+"TPuH .}4^b\ Print "" @krh <T6| Print "Files found for merging:" _KSlIgQ
}0 For Each curFile In fList ndE" v"_H Print Chr(9) & curFile "~nUwW|=1 Next "P9SW?', 9N*!C{VW 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. z<~yns`Y. Dim nameArray() As String, sampName As String jFwu&e[9; nameArray = Split(fList(0)," 0-0.txt") ./r#\X)dc sampName = nameArray(0) _]"uq/UWp Print "" *_,: &Ur Print "Sample name: " & Chr(9) & sampName ^dP]3D1
@ v*3tqT(% 'Open an output file and write the FRED header data
8n~ o=" Dim outFile As String p8bAz outFile = cDir & sampName & "_FRED.txt" BHrNDpv Open outFile For Output As #1 }48o{\ Print #1, "type bsdf_data" 1!"iN~ Print #1, "format angles=deg bsdf=value scale=1" tg#d.( xC^| S0B 'Loop the file list, skip the two header lines and write the remaining data to file &3~_9+ Dim lineArray() As String, curLine As Long MWHzrqCA For Each curFile In fList V=-hqo( Print "Merging data from file " & curFile Q!` ReadFile( cDir & curFile, lineArray ) 9X ^D( For curLine = 2 To UBound(lineArray) _WB*ArR Print #1, lineArray(curLine) j@778fvM\t Next ;]I~AGH: Next ps&p| ?'%9
'Close the output file m1{OaHxKh Close #1 @S#Ls="G y|h:{< Print "Finished merging RPC data for sample " & sampName *If]f0?% Print "FRED formatted data file: " & Chr(9) & outFile ,Z aPY End Sub XMi)PXs$ VcpN
PU6 'Utility function to read the contents of a file into an array of strings. 3uJ>:,~r Function ReadFile(ByVal fileName As String, _ r6:c<p [c ByRef lineArray() As String) As Long :(Uz`k7 F2WMts ReadFile = -1 1WJ%n; Dim oFSO As Object rG"QK!R5 Set oFSO = CreateObject("Scripting.FileSystemObject") MgG_D6tDM Erase lineArray 6eq`/~# }$D{YHF Dim fid As Long O od?ifA If oFSO.fileexists( fileName ) Then NoD\t(@h fid = FreeFile() g6l&;S40 Open fileName For Input As fid Q~>="Yiu lineArray = Split(Input(LOF(fid), fid), vbCrLf) ?CHFy2%Y Close fid wW1>#F End If |p"4cG?) Set oFSO = Nothing |\] _u 3 Return UBound( lineArray ) r>.^4Z@ fNNik7 End Function q+ )csgN S1G=hgF_L Sub GetFileList( ByVal in_dir As String, _ ~ s# !\Ye ByRef in_flist() As String ) "u.4@^+i 0\a;}
S'g# 'Redimension the file list array F%F :Gr/ Erase in_flist * u{CnH xjO((JC 'Tracks how many files are found ," ~4l&
Dim fCount As Long &XH{,fv$ fCount = 0 m~U2L XJ9l,:c, 'Recurse directory and search for text files [/Ya4=C@ Dim f As String ~G#^kNme f = Dir$(in_dir & "*.txt") zyF[I6Gs While f <> "" Sh2;^6d ReDim Preserve in_flist(fCount) aVbv.> in_flist(fCount) = f s\#eD0| fCount += 1 3|g]2|~w@h f = Dir$() u>I;Cir4 Wend 3G9AS#-C ReDim Preserve in_flist(fCount-1) pGh A L?~-<k End Sub SYZS@o
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