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摘要: w&aZ 97{ m"iA#3l*= 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。 sjg`4^!wDD ujX;wGje 背景: _Ns EeKU 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。 VIP7j(#t_g 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。 /q]rA 图1. RPC Photonics工程漫射体结构及光束投射形状
<Kv$3y -$Hu$Y}> k6;bUOo 步骤 @a?7D;+< Mz(Vf1pi% 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 akzGJ3g "+ou!YK+ 图2. RPC Photonics工程漫射体不同类型的散射数据 WR"D7{>tw 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) J{1H$[W~} 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 Y"GNJtsL " 例如下所示: qJrT Sample name: EDF-C1-56 U\Wo&giP[ Merging data from file EDF-C1-56 0-0.txt #_wq#rF Finished merging RPC data for sample EDF-C1-56 :eVZ5?F FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ){5Nod{}a 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 LKu\M h| a. 创建一个新的散射库 W-=6:y#A b. 散射模型命名 ;/j2(O^ c. 改变散射模型为“Tabulated BSDF”. \g39>;iR 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 ) <h7cQ 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。 [X.bR$> f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, K
-U}sW g. 点击OK -)`_w^Ox 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 kt/,& oKI >1Z"5F7= l<`> 脚本代码: J,2V&WuV0r "+F'WCJ-(* '#Language "WWB-COM" uw}Rr7q vjuFVJwL Option Explicit YA4 D?' '+PKGmRW Sub Main 7MKX`S f~`=I NrU 'Cleanup lM6pYYEq= ClearOutputWindow() hy5[
L`B -b(DPte Print "Merging RPC Photonics BSDF Data Files" to'7o8Z SetTextColor(255,0,0) u5(8k_7 Print "Note: Script should be located in the same folder as the BSDF TXT files." wGc7 Print "Note: Do not run this script multiple times without deleting the output file between executions." ?l0eU@rwQ SetTextColor(0,0,0) x#>V50E NBYJ'nA%;f 'Current directory of this script (should be the same as the text files being merged) +xFn~b/ Dim cDir As String Lgg,K//g cDir = MacroDir$ & "\" CJ IuMsZ FZr/trP~ 'Array which will be populated with the list of files to be merged k6(7G@@} Dim fList() As String, curFile As String P!eo#b^S GetFileList( cDir, fList ) oN7SmP_ +1ICX Print "" pM?;QG;jA Print "Files found for merging:" r
)F;8( For Each curFile In fList mlnF,+s Print Chr(9) & curFile $TI^8 3 Next >HP
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H s,HbW%s 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Aqyw Dim nameArray() As String, sampName As String j/O~8o& nameArray = Split(fList(0)," 0-0.txt") :GXF=Df sampName = nameArray(0)
=@HS Print "" a+w2cN' Print "Sample name: " & Chr(9) & sampName 6Y9N=\` No^gKh24 'Open an output file and write the FRED header data Nd~B$venh Dim outFile As String X0lPRk53( outFile = cDir & sampName & "_FRED.txt" p['RV Open outFile For Output As #1 l4bytI{63 Print #1, "type bsdf_data" 36"n7 Print #1, "format angles=deg bsdf=value scale=1" xE/?ncTK^ e97G]XLR 'Loop the file list, skip the two header lines and write the remaining data to file |N.2iN: Dim lineArray() As String, curLine As Long 7oE0;' For Each curFile In fList |R`"Zu` Print "Merging data from file " & curFile f9.?+.^_ ReadFile( cDir & curFile, lineArray ) !J$r|IX5 For curLine = 2 To UBound(lineArray) Bn}woyJdx Print #1, lineArray(curLine) $DbnPZ2$ Next J]F&4O Next Npp YUY _olQ;{ U: 'Close the output file q~ H>rC(\ Close #1 n5:uG'L\ w'S,{GW Print "Finished merging RPC data for sample " & sampName dljE.peL Print "FRED formatted data file: " & Chr(9) & outFile ^/f~\#R End Sub d>QFmsh- @N=vmtLP 'Utility function to read the contents of a file into an array of strings. HK;NR.D Function ReadFile(ByVal fileName As String, _ L5&M@YTH ByRef lineArray() As String) As Long GEc6;uz< @- U\!Tf ReadFile = -1 \TV Dim oFSO As Object {)[o*+9 Set oFSO = CreateObject("Scripting.FileSystemObject") uYh!04u Erase lineArray nV'1 $L# acd[rjeT Dim fid As Long osW"wh_ If oFSO.fileexists( fileName ) Then 3:J>-MO fid = FreeFile() dSM\:/t Open fileName For Input As fid &V].,12x lineArray = Split(Input(LOF(fid), fid), vbCrLf) RRL{a6(? Close fid $O"ss>8Se End If vsY?q8+P Set oFSO = Nothing T &ZQie/ Return UBound( lineArray ) r&gvP|W% @X==[gQ End Function NR4+&d w#A)B<Y/" Sub GetFileList( ByVal in_dir As String, _ ~ao:9ynY ByRef in_flist() As String ) $y(;"hy 1"h"(dA 'Redimension the file list array cgnNO& Erase in_flist \DB-2*a" ]C_+u_9 'Tracks how many files are found ?CpVA Dim fCount As Long R\j~X@vI fCount = 0 ,f
}$FZ 6= iHw24 'Recurse directory and search for text files +
G@N Dim f As String ^Q/*on;A,/ f = Dir$(in_dir & "*.txt") p3s i\Fm! While f <> "" c%H' jB[ ReDim Preserve in_flist(fCount) ,AP&N'
in_flist(fCount) = f 2t= =<x fCount += 1 c=m'I>A f = Dir$()
RD$:. Wend 'eM0i[E+` ReDim Preserve in_flist(fCount-1)
r!:yUPv "{q#)N End Sub Y_Yf'z1>[
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