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摘要: T)ISDK4>S" BP\6N%HC%& 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。 F'B0\v= @:>gRD 背景: dI!/H&`B] 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 a}P
|qI 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。 {:Kr't<XzF 图1. RPC Photonics工程漫射体结构及光束投射形状 i1bmUKZ8'L *O_^C Jz P0D' 步骤 ?a1pO#{Dg Imq-5To# 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。 C46jVl \F""G,AWq{ 图2. RPC Photonics工程漫射体不同类型的散射数据 o-;/x) 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) dT (i*E\j 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 !?+q7U 例如下所示: ~-R2mAUK Sample name: EDF-C1-56 !aL=R)G&e Merging data from file EDF-C1-56 0-0.txt <vD(,|| Finished merging RPC data for sample EDF-C1-56 p(Osz7K FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt |f.,fVVV; 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 h@y>QhYU0 a. 创建一个新的散射库 (=EDqAZg b. 散射模型命名 ~03MH' c. 改变散射模型为“Tabulated BSDF”. :-$8u;!M d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) :3b02}b7 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 !_B*Po f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, @~UQU)-( g. 点击OK xH}bX- m 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 DQaE9gmC DVJn;X^T: XP?)xDr8 脚本代码: Z_Y'#5o# x($Djx '#Language "WWB-COM" $J&c1 ["4Tn0g ; Option Explicit 7?y7fwER /H3w7QU Sub Main >mG64N
ARs]qUY 'Cleanup _+(@? ClearOutputWindow() TU*EtE'g/ 49c-`[d
L Print "Merging RPC Photonics BSDF Data Files" Uqy/~n-v< SetTextColor(255,0,0) ?)(-_N&T Print "Note: Script should be located in the same folder as the BSDF TXT files." \k{[HfVvn Print "Note: Do not run this script multiple times without deleting the output file between executions." \j3dB
tc SetTextColor(0,0,0) K>b4(^lf x}V&v?1{5 'Current directory of this script (should be the same as the text files being merged) bSz7?NAp Dim cDir As String xgpf2y!{ cDir = MacroDir$ & "\" VxARJ*4=Y fFWi
3. 'Array which will be populated with the list of files to be merged het<#3Bo Dim fList() As String, curFile As String ?:-:m'jdU GetFileList( cDir, fList ) "Aw)0a[j1 AQT_s9"0 Print "" r\Yh'cRW{ Print "Files found for merging:" CyW|k
Dz For Each curFile In fList =6"5kz10 Print Chr(9) & curFile qMA-# Next Au}l^&,zN `|nCnT' 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. v\@RwtP Dim nameArray() As String, sampName As String uoeZb=< nameArray = Split(fList(0)," 0-0.txt") { I\og sampName = nameArray(0) U V*Ruy- Print "" i1-%#YYF( Print "Sample name: " & Chr(9) & sampName Y$]zba k+w Ji 'Open an output file and write the FRED header data di0@E<@1: Dim outFile As String '[%#70* outFile = cDir & sampName & "_FRED.txt" .R'M'a#*!A Open outFile For Output As #1 Jww#zEK Print #1, "type bsdf_data" 79exZ7| Print #1, "format angles=deg bsdf=value scale=1" 1EEcNtpub] OE9,D:tv 'Loop the file list, skip the two header lines and write the remaining data to file FO:L+&hr?> Dim lineArray() As String, curLine As Long &} `a"tYr For Each curFile In fList 2A[hMbL Print "Merging data from file " & curFile LdN[N^n[H ReadFile( cDir & curFile, lineArray ) lv'WRS'} For curLine = 2 To UBound(lineArray) <r$h =hM Print #1, lineArray(curLine) !2l2;?jM Next x3+{Y Next q!@!eC[b [|=M<>?[ 'Close the output file kP ,8[r Close #1 ^-[
I;P RLB"}&SF] Print "Finished merging RPC data for sample " & sampName 31a lQ\TH Print "FRED formatted data file: " & Chr(9) & outFile !]82$ End Sub :Ev
gUA\4 .hR
<{P 'Utility function to read the contents of a file into an array of strings. Zr2!}jD9a Function ReadFile(ByVal fileName As String, _ 1BZ##xV*:G ByRef lineArray() As String) As Long s(3HZ>qx; fs&$?mHL){ ReadFile = -1 QOSMV#Nw% Dim oFSO As Object X3kFJ{ Set oFSO = CreateObject("Scripting.FileSystemObject") jqc}mI\# Erase lineArray nW7: ] hRu}P" Dim fid As Long k'#3fz\ If oFSO.fileexists( fileName ) Then kaB|+U9^ fid = FreeFile() dX@ic,? Open fileName For Input As fid #?>)5C\Hqy lineArray = Split(Input(LOF(fid), fid), vbCrLf) dB0#EJaE Close fid %\HPYnIe End If ^Z?m)qxvB Set oFSO = Nothing d$3md<lIB Return UBound( lineArray ) abR<( H12 m1Y a End Function w|s2f`! : #CWiq("% Sub GetFileList( ByVal in_dir As String, _ xw
43P. ByRef in_flist() As String ) aq}hlA(w %bN{FKNN 'Redimension the file list array BoYY^ih Erase in_flist L,y
q=%h| =CK% Zo 'Tracks how many files are found \]]K{DO Dim fCount As Long 8:V,>PH fCount = 0 VPYLDg.' w
a(Y[]V 'Recurse directory and search for text files W6NhJ#M7 Dim f As String x-CjxU3 f = Dir$(in_dir & "*.txt") >,]a>V While f <> "" uhfK\.3 ReDim Preserve in_flist(fCount) D5P-$1KPt in_flist(fCount) = f h$!YKfhq} fCount += 1 E4892B:` f = Dir$() )LFbz#;Y Wend 3Z9Yzv)A ReDim Preserve in_flist(fCount-1) C?gqX0[ q 9S@x End Sub fGlvum Y:TfD{Xgc MLHCBRi QQ:2987619807 +?U[362>
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