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摘要: IJ;*N lQ"i]};<D 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。 ]||=<!^kn U@nwSfp:G 背景: ?miM15XI 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。 =L%3q <]p 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。 3G^Ed)JvE 图1. RPC Photonics工程漫射体结构及光束投射形状 W+?[SnHL/ n~j[Pw -::%9D}P| 步骤 "'Uk0>d=_I |m- `,
we 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。 (_ah~VnO 'OCo1|iK~ 图2. RPC Photonics工程漫射体不同类型的散射数据 Ah{pidUx 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) ;4$C$r!t 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 bl_WN|SQ 例如下所示: PBtU4) Sample name: EDF-C1-56 S8m&Rj3O& Merging data from file EDF-C1-56 0-0.txt KTt$Pt/. Finished merging RPC data for sample EDF-C1-56 z D<9A6AB FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q%Q?q)x 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 uFZB8+ a. 创建一个新的散射库 X>7]g670@ b. 散射模型命名 [t{#@X c. 改变散射模型为“Tabulated BSDF”. 7"p s#)O d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) XWpnZFjE e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 E2'e}RQ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, #%b()I_([ g. 点击OK ^]&{"! 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [[h)4H{T )O C[;>F7 vqMk)htIz 脚本代码: 5l0rw)
_x6E_i-( '#Language "WWB-COM" es+_]:7B9 jMui+G(h Option Explicit <Cu?$ 9Pk3}f)a Sub Main 5dw@g4N %^ kDY]>v 'Cleanup x*8f3^ wE ClearOutputWindow() Juqn
X (!5}" fj Print "Merging RPC Photonics BSDF Data Files" yVQz<tX| SetTextColor(255,0,0) Ej09RO"pB Print "Note: Script should be located in the same folder as the BSDF TXT files." g{)H"
8L Print "Note: Do not run this script multiple times without deleting the output file between executions." Z !25xqNCd SetTextColor(0,0,0) y6jmn1K *jw$d8q2 'Current directory of this script (should be the same as the text files being merged) DPQGh`J Dim cDir As String Bye@5D cDir = MacroDir$ & "\" 8t:h oEoJa:h 'Array which will be populated with the list of files to be merged 'oZn<c` Dim fList() As String, curFile As String vLFaZ^( GetFileList( cDir, fList ) LiD |4(3 pkf OM"5' Print "" 1 lCikS^c Print "Files found for merging:" -s%-*K+,W For Each curFile In fList 8G l5)=2 Print Chr(9) & curFile 3hf;4Mb Next ro^6:w3O^ %_R|@cyD 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. _7.GzQJ Dim nameArray() As String, sampName As String gq_7_Y/ nameArray = Split(fList(0)," 0-0.txt") QC5f:BwM sampName = nameArray(0) GHC?Tp Print "" ph12x: @B Print "Sample name: " & Chr(9) & sampName P,;b'-5C 4:e q{n 'Open an output file and write the FRED header data C:GHP$/} Dim outFile As String ?V)C9@bp outFile = cDir & sampName & "_FRED.txt" MRg\FR2>1 Open outFile For Output As #1
2C33;?M Print #1, "type bsdf_data" $K.%un Gm Print #1, "format angles=deg bsdf=value scale=1" }d3N`TT 4 ^~zN"6] 'Loop the file list, skip the two header lines and write the remaining data to file pG F5aF7T Dim lineArray() As String, curLine As Long w^rb|mKo For Each curFile In fList fJ&<iD)6 Print "Merging data from file " & curFile *JY`.t ReadFile( cDir & curFile, lineArray ) 56=K@$L {F For curLine = 2 To UBound(lineArray) akvwApn5 Print #1, lineArray(curLine) /=YqjZTCq Next ZCE%38E N Next nl-t<#z[ ;;w6b:}-c 'Close the output file WW[`E Close #1 ELrZ8&5G ]Z$TzT&@% Print "Finished merging RPC data for sample " & sampName 4&oXy,8LC Print "FRED formatted data file: " & Chr(9) & outFile `mKlv~$1^ End Sub XAU_SPAjiw 7Z`Mt9:Ht 'Utility function to read the contents of a file into an array of strings. vpeBQ=2\ Function ReadFile(ByVal fileName As String, _ 9oje`Ay ByRef lineArray() As String) As Long tFvgvx\: Cb
)= n6 ReadFile = -1 x ?f0Hk+ Dim oFSO As Object jW1YTQ Set oFSO = CreateObject("Scripting.FileSystemObject") ])QO% Erase lineArray 4kaE}uKU BbXU|QtY Dim fid As Long BA1MGh If oFSO.fileexists( fileName ) Then yxG:\y
b fid = FreeFile() ;-9zMbte: Open fileName For Input As fid B%eDBu
") lineArray = Split(Input(LOF(fid), fid), vbCrLf) z{`6# Close fid A{4G@k+#d End If j(Fa=pi Set oFSO = Nothing d DIQ+/mmg Return UBound( lineArray ) y|e2j&m 9 wSl,B- End Function =GH@.3`X c_qcb7<~. Sub GetFileList( ByVal in_dir As String, _ 6^]`-4*W ByRef in_flist() As String ) 192 .W+H< nIV.9#~& 'Redimension the file list array !@^y)v Erase in_flist %\X P: WyBQ{H{So 'Tracks how many files are found W$ JY M3! Dim fCount As Long Z]x5! fCount = 0 !B [1zE P1)* q0 'Recurse directory and search for text files HUU >hq9 Dim f As String IOsXPf9@ f = Dir$(in_dir & "*.txt") hF7V !*5 While f <> ""
rV8(ia ReDim Preserve in_flist(fCount) y3={NB+ in_flist(fCount) = f k_*XJ <S!Y fCount += 1 I%;Rn:zl f = Dir$() j<l#qho{h Wend ->&BcPLn ReDim Preserve in_flist(fCount-1) }.fL$,7a Yl)eh(\&J End Sub |`_ <@b
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