RPC Photonics扩散片BSDF
摘要: C\5"Kb 4A~1Z,"%v( 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。 222Mm/QN &0%x6vea 背景: 4^AdSuV 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。 $]S*(K3U~ FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 @vkO(o
图1. RPC Photonics工程漫射体结构及光束投射形状 z(_#C
s .7M:AS> _';oT*# 步骤 Tn 3<cO7v ).9m6.%Uk 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 `_5{:
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图2. RPC Photonics工程漫射体不同类型的散射数据 ^+'\
u;\ 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) +*ZF52hy| 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 8UN7(J 例如下所示: E)utrO R Sample name: EDF-C1-56 {S5HH" Merging data from file EDF-C1-56 0-0.txt =^S1+B
MY- Finished merging RPC data for sample EDF-C1-56 z~O:w'(g FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt !1cVg
ls| 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 sAfNu~d a. 创建一个新的散射库 uQ'Izdm b. 散射模型命名 YVS~|4hu?i c. 改变散射模型为“Tabulated BSDF”. Ym5ji$!2 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 ) &5o ln@YL 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。 r*XEne 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, E|l qlS7 g. 点击OK tunjV1 ,] 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 4<Q^/-W lzup! `g g|rbkK%SoE 脚本代码: [$AOu0J pu?D^h9/ '#Language "WWB-COM" TIre,s)_ :FqHMN Option Explicit &R;Cm]jt Q%
LQP!Kg Sub Main p`2w\P3;) ^L"ENsOs 'Cleanup Y+0HC2(o ClearOutputWindow() @Rp#*{ MiB}10 Print "Merging RPC Photonics BSDF Data Files" $PE{}`#g SetTextColor(255,0,0) sxFkpf_h Print "Note: Script should be located in the same folder as the BSDF TXT files." 40)Ti Print "Note: Do not run this script multiple times without deleting the output file between executions." %AnqT|\#, SetTextColor(0,0,0) WG=~GDS> ;j^C35 'Current directory of this script (should be the same as the text files being merged) %1^E;n Dim cDir As String tEE4"OAy cDir = MacroDir$ & "\" 5}MjS$2og 1<TB{}b
Z 'Array which will be populated with the list of files to be merged 0; BX Dim fList() As String, curFile As String *Y/}EX!F GetFileList( cDir, fList ) \1R<GBC4 2~(\d\k Print "" VYC$Q;Z Print "Files found for merging:" mO(A'p "b For Each curFile In fList dAkJ5\=* Print Chr(9) & curFile CZ4Nw]dtR Next lZf=# IP=."w 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. B(B77SOb Dim nameArray() As String, sampName As String PG*:3![2 nameArray = Split(fList(0)," 0-0.txt") # )]L3H< sampName = nameArray(0) 7;x}W-`iF Print "" H". [&VP5Z Print "Sample name: " & Chr(9) & sampName Bq4^nDK $zv&MD!&h 'Open an output file and write the FRED header data 7ts`uI<E@7 Dim outFile As String j'M=+ outFile = cDir & sampName & "_FRED.txt" :j}4F Open outFile For Output As #1 Zm+QhnY| Print #1, "type bsdf_data" .qAlPe L: Print #1, "format angles=deg bsdf=value scale=1" .&2Nm&y$K W&`{3L 'Loop the file list, skip the two header lines and write the remaining data to file c|KN@)A Dim lineArray() As String, curLine As Long |';oIYs|$ For Each curFile In fList )E>nr
Z Print "Merging data from file " & curFile tX@G`Mr( ReadFile( cDir & curFile, lineArray ) `<x((@# For curLine = 2 To UBound(lineArray) ilr'<5rq Print #1, lineArray(curLine) sm9/sX! Next gof'NT\c Next $-ICTp `m7w%J.> n 'Close the output file ILyI%DA & Close #1 TQ&1!~L* 5g\>x;cc Print "Finished merging RPC data for sample " & sampName ;V)jC Print "FRED formatted data file: " & Chr(9) & outFile ayK?\srw End Sub J*FUJT R?L?6~/q 'Utility function to read the contents of a file into an array of strings. fs,]%g^ Function ReadFile(ByVal fileName As String, _ 0LD$"0v/C3 ByRef lineArray() As String) As Long %(YU*Tf~ }{y(&Oy3Y ReadFile = -1 }eq*dr1` Dim oFSO As Object X4I+ Set oFSO = CreateObject("Scripting.FileSystemObject") v-ZTl4j$ Erase lineArray 5zi}OGtXv c%x9.s<+1 Dim fid As Long 0Q4i<4 XW If oFSO.fileexists( fileName ) Then $LOwuvu> fid = FreeFile() hy|Yy&- Open fileName For Input As fid s9aa _Th lineArray = Split(Input(LOF(fid), fid), vbCrLf) rJ=r_v Close fid 67D{^K"KT End If u0{R;) Set oFSO = Nothing Uy98lv Return UBound( lineArray ) 2m{d> T:=ST3#m End Function )kk10AZV-E Da-U@e! Sub GetFileList( ByVal in_dir As String, _ qLWM,[Og ByRef in_flist() As String ) 64LAZEQX T]UrKj/iF 'Redimension the file list array _MLbJ Erase in_flist 57(5+Zme me ,lE- 'Tracks how many files are found Zgw4[GpL Dim fCount As Long /mG-g%gE fCount = 0 4H*M^?h\# ?"-1QG 'Recurse directory and search for text files B]#^&89wG) Dim f As String E]dc4US f = Dir$(in_dir & "*.txt") ?XllPnuKt% While f <> "" iBh.&K{j ReDim Preserve in_flist(fCount) {!>'#
F^e in_flist(fCount) = f 9 .18E(- fCount += 1 *4OB
88$ f = Dir$() \__xTL\ Wend A{%LL r: ReDim Preserve in_flist(fCount-1) 6`WI
S4 T6nc/|Ot End Sub ~A03J:Yc7 Fk`|?pQm a^g}Z7D'T QQ:2987619807 p1!-|Sqq
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