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摘要: o^lKM?t *P9)M% 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。 (B[0BjU p6>3
p 背景: )<!y_;$A Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 I]zCsT. FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 5B"j\TwQ 图1. RPC Photonics工程漫射体结构及光束投射形状 v k<By R TqzkF7;k4 W4X=.vr 步骤 <@JK;qm>S e)GFJ3sW_ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 [NyR$yD{ $+
lc;N 图2. RPC Photonics工程漫射体不同类型的散射数据 qd(`~a 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) {PdyKgM 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 vrQ/Yf:\B 例如下所示: !m:SRNPg Sample name: EDF-C1-56 bW[Y:}Hk~ Merging data from file EDF-C1-56 0-0.txt <Ms,0YKx Finished merging RPC data for sample EDF-C1-56 mpN|U(n FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ]iYjS 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 D/Bb)]9I a. 创建一个新的散射库 2Fp.m}42i( b. 散射模型命名 L%I@HB9-Q0 c. 改变散射模型为“Tabulated BSDF”. n:' Mpux 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 ) ..;}EFw5 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。 \M<C6m5 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, F0])g g. 点击OK ?%#3p[ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 xyBWV]Y .kyp5CD}4 m.Yj{u8zX 脚本代码: W(Xb]t=19 "Lw[ $ '#Language "WWB-COM" Z;-=x p k0Rd:DxO Option Explicit p^<*v8,~7 "NMX>a,( Sub Main M9M~[[
#J#x,BLI 'Cleanup MZl6J ClearOutputWindow() ,_F@9Up Hj2E -RwG Print "Merging RPC Photonics BSDF Data Files" |W:xbtPNy SetTextColor(255,0,0) bM+}j+0 Print "Note: Script should be located in the same folder as the BSDF TXT files." luY#l!mx3 Print "Note: Do not run this script multiple times without deleting the output file between executions." 8t25wPlx SetTextColor(0,0,0) *@^9]$*$ ViKN|W>T 'Current directory of this script (should be the same as the text files being merged) 6Q"fRXM Dim cDir As String ?:H4Xd7 cDir = MacroDir$ & "\" O3x9S,1i F-D9nI4{X 'Array which will be populated with the list of files to be merged :
M=0o< Dim fList() As String, curFile As String p48mk GetFileList( cDir, fList ) 0g o{gUI vz[oy |{F Print "" 14Y_ oH9 Print "Files found for merging:" KP,#x$Bg For Each curFile In fList CC"}aV5 Print Chr(9) & curFile R6eKI,y\" Next +-"uJIwMD % 8u97f W 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Gl;xd Dim nameArray() As String, sampName As String _c$l@8KS^ nameArray = Split(fList(0)," 0-0.txt") P'l'[Kz{' sampName = nameArray(0) EX@wenR Print "" X\sO eb:] Print "Sample name: " & Chr(9) & sampName =#L\fe)q) ktF\f[ 'Open an output file and write the FRED header data w=JO$7 Dim outFile As String ,yf2kU outFile = cDir & sampName & "_FRED.txt" K@U[x,Sx Open outFile For Output As #1 N)CM^$(T| Print #1, "type bsdf_data" B6UTooj Print #1, "format angles=deg bsdf=value scale=1" 2PZ#w(An& r`-=<@[ 'Loop the file list, skip the two header lines and write the remaining data to file .=G?Zd Dim lineArray() As String, curLine As Long X/Sp!W-H For Each curFile In fList Mj!\EUn Print "Merging data from file " & curFile `
ES-LLhVf ReadFile( cDir & curFile, lineArray ) GW{e"b/x For curLine = 2 To UBound(lineArray) `-Y8T\ Print #1, lineArray(curLine) uE E;~`G Next `s8*n(\h Next q8 &\;GK| AcHr X=O 'Close the output file FT8<a }o Close #1 9t8NK{ T:/mk`> Print "Finished merging RPC data for sample " & sampName tW-wO[2 Print "FRED formatted data file: " & Chr(9) & outFile U\y:\+e l End Sub ?COLjk #|j8vmfn$e 'Utility function to read the contents of a file into an array of strings. NdxPC~Z+ Function ReadFile(ByVal fileName As String, _ \RT3#X+ ByRef lineArray() As String) As Long Dbl3ef Wr+/9 ReadFile = -1 SL[ EOz# Dim oFSO As Object 9z#z9|hj)3 Set oFSO = CreateObject("Scripting.FileSystemObject") @oKW$\ Erase lineArray p!/!ZIo >Py:9~g, Dim fid As Long mswAao<y&x If oFSO.fileexists( fileName ) Then >BWe"{ ; fid = FreeFile() P(xgIMc H Open fileName For Input As fid u~8=ikn+T lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3D}Pa Close fid :P8X?C63W] End If ]WYddiF Set oFSO = Nothing :8t;_f Return UBound( lineArray ) ZHM NG~! ]!>tP,<`' End Function B4/\=MXb +v+Dkyf:V Sub GetFileList( ByVal in_dir As String, _ Ak kth*p ByRef in_flist() As String ) {%Rntb gySl.cxt 'Redimension the file list array l@:&0id4I Erase in_flist y9Pw'4R |mQC-=6t;Y 'Tracks how many files are found sK@]|9ciQ Dim fCount As Long ~KYA{^`* fCount = 0 @$fvhEkrT@ uCx6/n6' 'Recurse directory and search for text files kO/YO)g Dim f As String zI= 9 f = Dir$(in_dir & "*.txt") Q_6v3no1 While f <> "" %RX!Pi}5+g ReDim Preserve in_flist(fCount) OUhlQq\ in_flist(fCount) = f 6 \?GY fCount += 1 eRm*+l|? f = Dir$() =F% <W7 Wend {nMCU{*k ReDim Preserve in_flist(fCount-1) g;~$xXn 2WS Wfh End Sub Mtaky=l8~I
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