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摘要: 5 +Ei!E89 1^x"P #u 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。 )dv w.X biBo?k;4 背景: 8,0WHivg 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。 >;$C@ 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。 /Vg=+FEO 图1. RPC Photonics工程漫射体结构及光束投射形状 |B<;4ISaRI <K(qv^C 7O=N78M 步骤 lhx"<kR4 "}ms| 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。 JZa^GW:YQh :?2@qWaL 图2. RPC Photonics工程漫射体不同类型的散射数据 zA
; 7Nv$3 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) eWgqds 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 \-]zXKl2k 例如下所示: e;*GbXd| Sample name: EDF-C1-56 = 02$Dwr Merging data from file EDF-C1-56 0-0.txt :"vW;$1
} Finished merging RPC data for sample EDF-C1-56 4dEfXrMf FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 0bR)]"K 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 nE2w? a. 创建一个新的散射库 H8'q Y b. 散射模型命名 7z_EX8^ c. 改变散射模型为“Tabulated BSDF”. 8l?mNapy d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) EO_:C9=d{ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 y.xyr"-Q f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 8NE+G.:G g. 点击OK Yq$KYB j 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 r+0<A.''a *&=sL k
Y}r^NaQA 脚本代码: Ug VLHwkvk !nBE[& '#Language "WWB-COM" )V6Bzn}9 -E$(<Pow~\ Option Explicit pZ@)9c M_OvIU(E Sub Main 3Uy4 8ue -/ltnx)j 'Cleanup 61[ 8I},V ClearOutputWindow() Q{:5gh u!B6';XY Print "Merging RPC Photonics BSDF Data Files" M2$.Yom[ SetTextColor(255,0,0) S`\03(zDA Print "Note: Script should be located in the same folder as the BSDF TXT files." I:L}7uA[t Print "Note: Do not run this script multiple times without deleting the output file between executions." uZg[PS=@!X SetTextColor(0,0,0) dr[sSBTY" Jp d|<\Ml 'Current directory of this script (should be the same as the text files being merged) $ #*";b)QY Dim cDir As String tbH`VD"u cDir = MacroDir$ & "\" yMd<<:Ap e}PJN6"5
'Array which will be populated with the list of files to be merged ]UMt Dim fList() As String, curFile As String 6XFLWN-) GetFileList( cDir, fList ) PXx:JZsju B%.vEk)* Print "" +=V[7^K; Print "Files found for merging:" r*r3QsO For Each curFile In fList &P0jRT3e#Y Print Chr(9) & curFile ?_@_NV MY Next z>6hK:27 >, 9R :X( 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. _oILZ, Dim nameArray() As String, sampName As String \C&[BQ\ nameArray = Split(fList(0)," 0-0.txt") )Z" sampName = nameArray(0) Jn#05Z Print "" eXYf"hU, Print "Sample name: " & Chr(9) & sampName l!d |luqbA dPm_jX 'Open an output file and write the FRED header data M SnRx*- Dim outFile As String HkL:3 E. outFile = cDir & sampName & "_FRED.txt" \{@n>Mh Open outFile For Output As #1 BKV,V/*p Print #1, "type bsdf_data" moOc
G3=9 Print #1, "format angles=deg bsdf=value scale=1" C5F=J8pY gB)Cmw* 'Loop the file list, skip the two header lines and write the remaining data to file L%CBz]` Dim lineArray() As String, curLine As Long n|M~C\* For Each curFile In fList 'Zket=Sm; Print "Merging data from file " & curFile &*JU
N}86 ReadFile( cDir & curFile, lineArray ) 7;i [ For curLine = 2 To UBound(lineArray) 0# d:<+4D Print #1, lineArray(curLine) T!yI+<
Next e|e"lP Next =>LQW;Sjz %@~;PS3kd 'Close the output file _X6@.sM/2 Close #1 1zP)~p3a F*['1eAmdY Print "Finished merging RPC data for sample " & sampName ZYexW=@ Print "FRED formatted data file: " & Chr(9) & outFile b;5&V_ End Sub {@7xOOAw \+T U{vr 'Utility function to read the contents of a file into an array of strings. DCheG7lo{ Function ReadFile(ByVal fileName As String, _ NRI@M5 ByRef lineArray() As String) As Long unB`n'L !K %8tr4 ReadFile = -1 %jErLg Dim oFSO As Object Gv+$7{ Set oFSO = CreateObject("Scripting.FileSystemObject") >>b <)?3Rv Erase lineArray /Pyj|!C3`q #7r13$>! Dim fid As Long oO4hBM([ If oFSO.fileexists( fileName ) Then /7fD;H^* fid = FreeFile() (Zz8 ldO Open fileName For Input As fid 3Ow bU lineArray = Split(Input(LOF(fid), fid), vbCrLf) L']"I^(N Close fid xh:A*ZI=7 End If [lz#+~rOS Set oFSO = Nothing Wi+}qO Return UBound( lineArray ) PY76;D*` 35KRJY# End Function V]5MIiNl $}8@?>-w Sub GetFileList( ByVal in_dir As String, _ yBl9 a-2A ByRef in_flist() As String ) %5ovW<E: rX}FhBl5 'Redimension the file list array ^:u-wr8?{ Erase in_flist $z[@DB[ 5kik+ 'Tracks how many files are found NA!?.zn Dim fCount As Long cw/E?0MWb fCount = 0 ufn%sA t\XA
JU 'Recurse directory and search for text files v];P| Fi Dim f As String GCj[ySCD f = Dir$(in_dir & "*.txt") \#!B*:u While f <> "" MS`XhFPS. ReDim Preserve in_flist(fCount) cb5T-'hY
in_flist(fCount) = f `rest_vu fCount += 1 _A~>?gJ;, f = Dir$() O<P(UT" Wend _ -|+k ReDim Preserve in_flist(fCount-1) x8o/m$[,=u /d*[za'0 End Sub gx.\&W b MG,)|XpyWJ ]YrgkC35 QQ:2987619807 ( _3QZ
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