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摘要: @oYTJd(v{ BjOrQAO 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。 "0zMx`Dh #@lr$^M
背景: *~2jP;$ 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。 3)42EM'9( 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。 =eTI@pN` 图1. RPC Photonics工程漫射体结构及光束投射形状 x1mxM#ql +zz9u?2C` 98o;_tU' 步骤 Ldt7?Y(V( &v3r#$Hj[
1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 kD MS7y<s A 7DdU NR 图2. RPC Photonics工程漫射体不同类型的散射数据 P{QRmEE 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 7fnKe2MM 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ;@v7AF6Hq 例如下所示: dA\>z[n= Sample name: EDF-C1-56 :qgdn,Me Merging data from file EDF-C1-56 0-0.txt ,ulNap"R Finished merging RPC data for sample EDF-C1-56 90I)"vfW5 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q+dBSKSK 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 cr,o< a. 创建一个新的散射库 3<fJ5-z|- b. 散射模型命名 #Yj0'bgK c. 改变散射模型为“Tabulated BSDF”. Y k~ i.p d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) [>Q{70 c[ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 },[S 9I`p f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, %k$+t g. 点击OK i&.F}bEi 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 kFD- >{Lfrc1 iVXR=A\er 脚本代码: >SfC '* 1 Y5ebpw+B- '#Language "WWB-COM" _%i|* }})4S;j Option Explicit -uO< ] GXJ3E"_. Sub Main ;J?^M!l2= /:awPYGH<1 'Cleanup f()^^ + ClearOutputWindow()
4uU(t ;}|.crMF Print "Merging RPC Photonics BSDF Data Files" sPc\xY SetTextColor(255,0,0) 0b*a2_|8k Print "Note: Script should be located in the same folder as the BSDF TXT files."
36Wuc@<H Print "Note: Do not run this script multiple times without deleting the output file between executions." _;LHC;,:
SetTextColor(0,0,0) 9Cf^Q3)5o #Kn7
xn[ 'Current directory of this script (should be the same as the text files being merged) hh: )"<[ Dim cDir As String ax7 M cDir = MacroDir$ & "\" "lN<v= ]*zF#Voc 'Array which will be populated with the list of files to be merged QfwGf,0p Dim fList() As String, curFile As String 3]}W GetFileList( cDir, fList ) Ej.D!@ X8;03EW; Print "" GIZNHG Print "Files found for merging:" #+ n
& For Each curFile In fList OtQKDpJq Print Chr(9) & curFile TTy1a:V Next =WDf [?ED ch :428 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 6{+~B2Ef Dim nameArray() As String, sampName As String -t*C-C'"| nameArray = Split(fList(0)," 0-0.txt") YT&_{nL#\ sampName = nameArray(0) 5-]%D(y Print "" cs@5K$v Print "Sample name: " & Chr(9) & sampName 8^< -; kO2im+y 'Open an output file and write the FRED header data xYwbbFGrG Dim outFile As String 2M1yw " outFile = cDir & sampName & "_FRED.txt" DlIfr6F Open outFile For Output As #1 CqrmdWN Print #1, "type bsdf_data" |h6@hB\ Print #1, "format angles=deg bsdf=value scale=1" ^ /g&Q 70KXBu<6
'Loop the file list, skip the two header lines and write the remaining data to file `L9o!OsQ Dim lineArray() As String, curLine As Long Kh% x For Each curFile In fList P<2yCovn` Print "Merging data from file " & curFile k5}i^^. ReadFile( cDir & curFile, lineArray ) qRB%G<H For curLine = 2 To UBound(lineArray) ih~c(&n0 Print #1, lineArray(curLine) I;mtyS Next @d4zSG/s5w Next %o{vD&7\ ~r=TVHjqi 'Close the output file [N7[%iQ% Close #1 zlFl{t OpH9sBnA Print "Finished merging RPC data for sample " & sampName lfI[r| Print "FRED formatted data file: " & Chr(9) & outFile w;#9 hW& End Sub 7r}gS2d &6}vvgz 'Utility function to read the contents of a file into an array of strings. u $sX6 Function ReadFile(ByVal fileName As String, _ rxDule3m ByRef lineArray() As String) As Long 4Nq n47|>e )n0g6 ReadFile = -1 gNZ^TeT Dim oFSO As Object 46e;UUf!d Set oFSO = CreateObject("Scripting.FileSystemObject") GXHk{G@TS Erase lineArray N8nyTPw C($`'~b Dim fid As Long ^k-H$] If oFSO.fileexists( fileName ) Then qt;6CzL
C fid = FreeFile() 9qqEr~ Open fileName For Input As fid .vT'hu
lineArray = Split(Input(LOF(fid), fid), vbCrLf) Rj E,Wn Close fid VUNQ@{ST|1 End If %F}`;>C3 Set oFSO = Nothing 5<#H=A~( Return UBound( lineArray ) y*7ht{B Y[x ^59 End Function ]j{S' cz s;5PHweWf Sub GetFileList( ByVal in_dir As String, _ 8^4X/n ByRef in_flist() As String ) wT.V3G X=.+XP] 'Redimension the file list array }"cb^3 Erase in_flist @pG\5 Jnf N?pD"re)6 'Tracks how many files are found gE$dz#t. Dim fCount As Long B8TI 5mZ4 fCount = 0 BtqJkdK!;1 IGB>8$7 'Recurse directory and search for text files ipbVQ7 Dim f As String cF/FretoO f = Dir$(in_dir & "*.txt") ?29
KvT;#] While f <> "" FlkAo] ReDim Preserve in_flist(fCount) o oS4F1ta in_flist(fCount) = f L g%cVSz/C fCount += 1 $[|8bE f = Dir$() !-;Me&"I=` Wend y'zEaL&SI@ ReDim Preserve in_flist(fCount-1) %{Ls$Y) -)$)<k End Sub IO6i sJ0y3)PQ h+Z|s QQ:2987619807 f0^s*V+
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