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摘要: :y2p@#l# 93IFcmO.H@ 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。 ^Cv^yTj;& fnCItK~y 背景: dV?5Q_} 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。
@>x pYV 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。 NDO\B,7 图1. RPC Photonics工程漫射体结构及光束投射形状 ,&HR(jTo J
wm T/ )R_E|@" 步骤 >\<*4J$PZ Y`6rEA0 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 qW_u S<nq8Ebmw 图2. RPC Photonics工程漫射体不同类型的散射数据 o$.e^XL
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) fU2qrcVu 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 hIJ)MZU| 例如下所示: 6
fz} Sample name: EDF-C1-56 utlpY1#q/ Merging data from file EDF-C1-56 0-0.txt R)Mt(gFZT_ Finished merging RPC data for sample EDF-C1-56 V2|3i}V" FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt M!M!Ni 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ?RFg$Z'^ a. 创建一个新的散射库 qJR!$? b. 散射模型命名 kJs^ z c. 改变散射模型为“Tabulated BSDF”. l]2r)!Q7 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 ) m+$ @'TbP 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。 W&"|}Pi/ 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, *oI*-C g. 点击OK ]7AX%EG3 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 17g^ALs Q}A=jew Zt3}Z4d 脚本代码: o**y Z2 |4Ck;gg!j '#Language "WWB-COM" C.!_]Pxs PWgDFL? Option Explicit VY 1vXM3y >x:EJV Sub Main ^b?2N/m@ +UWU|: 'Cleanup )wzV
$(~ ClearOutputWindow() &217l2X
/ -dTLunv Print "Merging RPC Photonics BSDF Data Files" 9vGs; SetTextColor(255,0,0) 3mt%!}S Print "Note: Script should be located in the same folder as the BSDF TXT files." 8_\W/I!7b Print "Note: Do not run this script multiple times without deleting the output file between executions." |E/L.gdP7 SetTextColor(0,0,0) zjX7C~h^Q CidM( 'Current directory of this script (should be the same as the text files being merged) \Mx
JH[ Dim cDir As String zxZtz cDir = MacroDir$ & "\" r;cV&T/?
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3oV 'Array which will be populated with the list of files to be merged |@VF.)_ Dim fList() As String, curFile As String @y~P&HUN GetFileList( cDir, fList ) \Xg?Ug*9w *ftC_v@p5 Print "" XbvDi+R2A Print "Files found for merging:" ^Ip3A For Each curFile In fList fJ80tt?r Print Chr(9) & curFile JSMPyj Next yDd[e]zS` Db03Nk># 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. l`n5~Fs Dim nameArray() As String, sampName As String udqge?Tz nameArray = Split(fList(0)," 0-0.txt") j^u[F" sampName = nameArray(0) ?KN:r E Print "" $G?(OWI}l` Print "Sample name: " & Chr(9) & sampName z)L}ECZh9 :
1)}Epo, 'Open an output file and write the FRED header data M?6;|-HH Dim outFile As String sB*o)8 outFile = cDir & sampName & "_FRED.txt" I^0t2[M Open outFile For Output As #1 whkJ pK(
Print #1, "type bsdf_data" Z(!pYhLq Print #1, "format angles=deg bsdf=value scale=1" ]
VG?+ {K.rl%_|N 'Loop the file list, skip the two header lines and write the remaining data to file u35q,u=I Dim lineArray() As String, curLine As Long *=nO For Each curFile In fList NtZ6$o<Y Print "Merging data from file " & curFile Kr3];(w{ ReadFile( cDir & curFile, lineArray ) fNhT;Bux
For curLine = 2 To UBound(lineArray) *%- ?54B Print #1, lineArray(curLine) |_pl;&;: Next j=3-Qk`"/| Next O2#S: ~h r\mPIr| 'Close the output file ^e9aD9 Close #1 W8/(;K`/ 8 lS($@@{ Print "Finished merging RPC data for sample " & sampName 1Ii| {vR Print "FRED formatted data file: " & Chr(9) & outFile ?V+wjw End Sub 1mUTtYU qC
j*>D 'Utility function to read the contents of a file into an array of strings. I6w/0,azC Function ReadFile(ByVal fileName As String, _ ,olwwv_8G ByRef lineArray() As String) As Long d^aNR
Lv {[3YJkrM ReadFile = -1 @ M[Q$: Dim oFSO As Object r@$B'CsLj Set oFSO = CreateObject("Scripting.FileSystemObject") ,C!n}+27 Erase lineArray |3@=CE7G ec'tFL#u{ Dim fid As Long {})y^L If oFSO.fileexists( fileName ) Then X%J%A-k] fid = FreeFile() \!PV*%P Open fileName For Input As fid G2@KI- lineArray = Split(Input(LOF(fid), fid), vbCrLf) v72,h Close fid ,8`O7V{W End If |BJqy/ Set oFSO = Nothing SKxe3
Return UBound( lineArray ) h6FgS9H :0dfB&7 End Function w b+<a 0^iJlR2 Sub GetFileList( ByVal in_dir As String, _ .;Z.F7{q ByRef in_flist() As String ) $[QcEk 2fBYT4*P;
'Redimension the file list array Ut;'Gk Erase in_flist ohTd'+Lm Z!)f* 'Tracks how many files are found 0.(Ml5&e Dim fCount As Long 4
m$sJ fCount = 0 "i''Ui\H XW:%vJu^` 'Recurse directory and search for text files -7L Dim f As String '_E c_F f = Dir$(in_dir & "*.txt") 0%;MVMH While f <> "" ;(`e^IVf ReDim Preserve in_flist(fCount) f-]><z in_flist(fCount) = f a(!3Afi fCount += 1 LH.%\TMN$ f = Dir$() pg5&= Wend eEie?#Z/6 ReDim Preserve in_flist(fCount-1) q-uLA&4 *s36OF! End Sub b\M b*o
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