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摘要: ;Q;j@yx (&:gD4. 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。 /5ZX6YkeH 9|+6@6VY! 背景: [*',pG 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。 &~,4$&_ FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 g":[rXvId 图1. RPC Photonics工程漫射体结构及光束投射形状 iEvQ4S6tD 1-_r\sb y}odTeq 步骤 II\&)_S.4 @tH9$J*Y< 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。 $GJT 3z+l-QO8 图2. RPC Photonics工程漫射体不同类型的散射数据 isZ5s\ 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) YT\@fgBt 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ":Wq<Z' 例如下所示: bNea5u## Sample name: EDF-C1-56 Y?0/f[Ax,y Merging data from file EDF-C1-56 0-0.txt ]O@$}B];) Finished merging RPC data for sample EDF-C1-56 iM+`7L' FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt -#|D> 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 :?t~|7O: a. 创建一个新的散射库 qlO}=b/ b. 散射模型命名 un{ZysmtB6 c. 改变散射模型为“Tabulated BSDF”. 4%(Ji 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 ) [?!I*=*b 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。 1+x"
5<(W 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, A6&*VD g. 点击OK *pKTJP 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 b^1QyX^?: O `}EiyV D|;O9iks# 脚本代码: ~6 6xO9s `Fy-"Uf '#Language "WWB-COM" #z `W ,^C ag=d6q Option Explicit FwCb$yE#M [,zq Sub Main lPTx] =G Jup)m/ 'Cleanup 4QL>LK ClearOutputWindow() d1j9{ E[H Print "Merging RPC Photonics BSDF Data Files" .|UQ)J?s SetTextColor(255,0,0) )BP*|URc Print "Note: Script should be located in the same folder as the BSDF TXT files." %Tm*^ Print "Note: Do not run this script multiple times without deleting the output file between executions." +a1x; SetTextColor(0,0,0) Zi!Ta"}8 $NXP)Lic) 'Current directory of this script (should be the same as the text files being merged) F@w; .e! Dim cDir As String "W|A^@r} cDir = MacroDir$ & "\" \CbJU [ERZ".? 'Array which will be populated with the list of files to be merged cnv>&6a) Dim fList() As String, curFile As String w0pMH p'Y GetFileList( cDir, fList ) YGp+[|' zw0w."V
Print "" %bW_,b Print "Files found for merging:" xP;r3u
s For Each curFile In fList C8N)!5(A Print Chr(9) & curFile !rvEo =^ Next )Fw/Cu +.G"ool 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. e[S`Dm"i)' Dim nameArray() As String, sampName As String p?@ %/!S nameArray = Split(fList(0)," 0-0.txt") 'rQ"Dc1D sampName = nameArray(0) B/?
L$m Print "" 7e/+C{3v Print "Sample name: " & Chr(9) & sampName % RSZ. IK~&`n](> 'Open an output file and write the FRED header data +6m.f,14q Dim outFile As String I[\~pi, outFile = cDir & sampName & "_FRED.txt" y_]+;% w: Open outFile For Output As #1 =OVDJ0ozZ Print #1, "type bsdf_data" 6 SSDc/ Print #1, "format angles=deg bsdf=value scale=1" yU? jmJ !3ggQG!e 'Loop the file list, skip the two header lines and write the remaining data to file NkE0S`Xf Dim lineArray() As String, curLine As Long ,Kit@`P% For Each curFile In fList =bVPHrKNQ Print "Merging data from file " & curFile .6B\fr.za ReadFile( cDir & curFile, lineArray ) vqf$(" For curLine = 2 To UBound(lineArray) Hvl
n>x@ Print #1, lineArray(curLine) 4E'9;tA3l Next s='+[*&& Next I`>U#x* '`];=QY9pg 'Close the output file B@,9Cx564 Close #1 y4V:)@P l6viP}R Print "Finished merging RPC data for sample " & sampName Mf}M/Fh Print "FRED formatted data file: " & Chr(9) & outFile :Mf" End Sub 6Rd4waj_,U 9
_d2u# 'Utility function to read the contents of a file into an array of strings. iyskADS Function ReadFile(ByVal fileName As String, _ x 3@-E ByRef lineArray() As String) As Long +SJ.BmT dWqn7+: ReadFile = -1 D}-.< Dim oFSO As Object :5d>^6eoB? Set oFSO = CreateObject("Scripting.FileSystemObject") S63Zk0(25 Erase lineArray nK&]8" L9x-90'q, Dim fid As Long 5J5si<v25 If oFSO.fileexists( fileName ) Then K*6 "c.D fid = FreeFile() 4<s.|W` Open fileName For Input As fid 9KSi-2?H lineArray = Split(Input(LOF(fid), fid), vbCrLf) xad`-vw Close fid @=J|%NO End If '<Z[e`/ Set oFSO = Nothing V\V
/2u5- Return UBound( lineArray ) Cs $5Of( QYJ
EUC@ End Function 0=d2_YzSf 1Pf(.&/9_ Sub GetFileList( ByVal in_dir As String, _ 49$P ByRef in_flist() As String ) 7#8Gn=g *kr/,_K 'Redimension the file list array V\~. Erase in_flist `-NK:;^ ?^|`A}q# 'Tracks how many files are found \l+v,ELX= Dim fCount As Long K}*ets1s} fCount = 0 .nV2n@SR DM.lQ0xk 'Recurse directory and search for text files jX53 owZ Dim f As String 7y=>Wa ?T[ f = Dir$(in_dir & "*.txt") p [ O6 While f <> "" JJ.8V72;!Z ReDim Preserve in_flist(fCount) Z\0Rw># in_flist(fCount) = f LZ*8YNp1' fCount += 1 mh
}M|h5Im f = Dir$() 9hp&HL)BOa Wend Uqr>8|t? ReDim Preserve in_flist(fCount-1) yzK; "> uN={Iy End Sub /-=fWtA
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