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摘要: =1kjKE ! 6? (8KsaN 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。 RA62Z&W3 )3_g&& 背景: *!(?=9[ 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。 T|nN. 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。 |B*`%7{+ 图1. RPC Photonics工程漫射体结构及光束投射形状 *r3u=oWb |Oaj
Jux "2/VDB4!FG 步骤 _nnl+S>K dv\oVD 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。 Eh;~y*k\ b+}*@xhl 图2. RPC Photonics工程漫射体不同类型的散射数据 }%-`CJ, 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) d3C*]|gQ 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
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例如下所示: Ie;}k;?- Sample name: EDF-C1-56 KK*"s^L Merging data from file EDF-C1-56 0-0.txt *SZ*S%oS3 Finished merging RPC data for sample EDF-C1-56 l:kF0tj" FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt sXSZ#@u,WN 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 RT2a:3f a. 创建一个新的散射库 ?G-a:'1!6 b. 散射模型命名 hMx/}Tw wt c. 改变散射模型为“Tabulated BSDF”. xH8nn3U 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 )
*o[*,1Pw 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。 K`1\3J) 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, yyHr. C g. 点击OK ffyKAZ{]po 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (iiyptJ F;&'C$% gasl%& 脚本代码: !$+J7\&7p N|1k6g=0 '#Language "WWB-COM" {/ _.]Vh
S,v9\wN. Option Explicit V9m1n=r ^\\cGJ&8c Sub Main A|@d4+
FyQ^@@ 'Cleanup .,x08M ClearOutputWindow() nyPA`)5F0 b_=k"d Print "Merging RPC Photonics BSDF Data Files" *$_<|
g)9 SetTextColor(255,0,0) G";yqG Print "Note: Script should be located in the same folder as the BSDF TXT files." EY!aiH6P Print "Note: Do not run this script multiple times without deleting the output file between executions." GL1!Z3 SetTextColor(0,0,0)
n/UyMO3= 5,qfr!hN, 'Current directory of this script (should be the same as the text files being merged) Fk
1M5Dm Dim cDir As String *-Y|qS% cDir = MacroDir$ & "\" 4oOe hD l+ 'Array which will be populated with the list of files to be merged (F7!&] 8% Dim fList() As String, curFile As String :/Nz' n GetFileList( cDir, fList ) J]|-.Wv1 QkzPzbF" Print "" 82Vxk Print "Files found for merging:" Yb x4 Up@ For Each curFile In fList _&JlE$ua7 Print Chr(9) & curFile ^QV;[ha,o Next ^ yu^Du +]|J 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. jvm
"7)h Dim nameArray() As String, sampName As String 4(YKwY2_L nameArray = Split(fList(0)," 0-0.txt") OY`G _=6!N sampName = nameArray(0) !cE)LG Print "" ({zp$P} Print "Sample name: " & Chr(9) & sampName 'J<KL#og <<&:BK 'Open an output file and write the FRED header data "Rs^0iT7> Dim outFile As String M* QqiE outFile = cDir & sampName & "_FRED.txt" Khw!+!(H Open outFile For Output As #1 Ctt{j'-[ Print #1, "type bsdf_data" M6|Q~8$ Print #1, "format angles=deg bsdf=value scale=1" WE`Y! E9226 'Loop the file list, skip the two header lines and write the remaining data to file 4y21v|(9 Dim lineArray() As String, curLine As Long kG,6;aVZ8 For Each curFile In fList F/RV{} 17E Print "Merging data from file " & curFile h.~S^uKi* ReadFile( cDir & curFile, lineArray ) JYKA@sZHe For curLine = 2 To UBound(lineArray) (g~&$&pa Print #1, lineArray(curLine) tp*AA@~ Next l=
!KZaH Next rMf& HX 3r^i>r8B 'Close the output file rmR7^Ycv/ Close #1 $o1Gxz r"U$udwjg Print "Finished merging RPC data for sample " & sampName Fv5@-&y$W Print "FRED formatted data file: " & Chr(9) & outFile @ZK|k End Sub g4j?E{M? d%4!d_I< 'Utility function to read the contents of a file into an array of strings. 'ei9* 4y Function ReadFile(ByVal fileName As String, _ }L@!TWR-Qu ByRef lineArray() As String) As Long -jFt4Q7}8 #xE"]; ReadFile = -1 [al$7R& Dim oFSO As Object b^5rV5d Set oFSO = CreateObject("Scripting.FileSystemObject") gnB%/g[_ Erase lineArray )0RH"#,2L W)w@ju$Ko Dim fid As Long 81H04L9K 7 If oFSO.fileexists( fileName ) Then *]O[ZjyOY fid = FreeFile() B7T(9Tj+Fh Open fileName For Input As fid T3)/?f?| lineArray = Split(Input(LOF(fid), fid), vbCrLf) s'fHhG6 Close fid =QOtag1; End If IM)\-O\Wd Set oFSO = Nothing oXV Return UBound( lineArray ) n>Q/XQXB -5d8j<, End Function 2Wq)y1R<T <q%buyQna Sub GetFileList( ByVal in_dir As String, _ 0D:J d6\ ByRef in_flist() As String ) 8KT|ixs SgFyv<6>: 'Redimension the file list array ;wgm
'jr Erase in_flist }N*6xr*X+ % nP13V] 'Tracks how many files are found mTYEK4} Dim fCount As Long "F}anPY fCount = 0 0b~5i-zM/ 8GV$L~i 'Recurse directory and search for text files q9yY% Dim f As String @B*?owba> f = Dir$(in_dir & "*.txt") ft4J.oT While f <> "" B.;/N220P ReDim Preserve in_flist(fCount) D*DCMMp=0 in_flist(fCount) = f XNf%vC> fCount += 1 :_i1)4[! f = Dir$() %{5mkO&,2 Wend @q],pD ReDim Preserve in_flist(fCount-1) S;a{wYF6v 9eH(FB End Sub $^y6>@~
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