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w(hAPv b<MMli 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。 m`6`a|Twp$ 8#3cmpx4 背景: C3Z(k} 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。 4SO{cst 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。 C/#/F#C 图1. RPC Photonics工程漫射体结构及光束投射形状 ::t!W7W M4]|(A 438>)= 步骤 U}5KAi 9Z n m$G4Q 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 V#FLxITk ITOGD 图2. RPC Photonics工程漫射体不同类型的散射数据 k.hSN8 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ZACn_gd[5 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 z>q_]U0 例如下所示: Tdp$laPO' Sample name: EDF-C1-56 jtJU5Q Merging data from file EDF-C1-56 0-0.txt L^Af3]]2 Finished merging RPC data for sample EDF-C1-56 !T1i_ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt U4/$4.'NQ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 8XE0 p7 a. 创建一个新的散射库 X> KsbOZ b. 散射模型命名 .5zJ bZ9 c. 改变散射模型为“Tabulated BSDF”. <i?-x&Q?= d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Z ISd0hV e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 jP]'gQ!-w f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, N{@eV][Q g. 点击OK n*|-"'j 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 F:U_gW? [! o-F; tt91)^GdYa 脚本代码: q3:'
69 a&PZ7!PZv '#Language "WWB-COM" m]vr|:{6/ r
+fzmb Option Explicit my0->W%L :@L5=2Z+ Sub Main HyMb-Us w, wt<@} 'Cleanup h Nwb.[ ClearOutputWindow() vUNE!j W>49,A,q Print "Merging RPC Photonics BSDF Data Files" Fx\Re]~n SetTextColor(255,0,0) sa?;D Print "Note: Script should be located in the same folder as the BSDF TXT files." djp(s$:{4 Print "Note: Do not run this script multiple times without deleting the output file between executions." w[_Uv4M SetTextColor(0,0,0) AE Jm/8,T Sy55w={ 'Current directory of this script (should be the same as the text files being merged) }Z=Qy;zk Dim cDir As String W_EN4p~J cDir = MacroDir$ & "\" XDQ1gg` .j.=|5nVo4 'Array which will be populated with the list of files to be merged '{~ej: Dim fList() As String, curFile As String XQPJ(.G GetFileList( cDir, fList ) ~>|U %3}] + u+fEg/A Print "" cm<3'#~Q? Print "Files found for merging:" pcG q For Each curFile In fList R&A.F+Zgt Print Chr(9) & curFile 8a{g EZT, Next [%y D,8 Q[^d{e*l 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 6]*qx5m`<l Dim nameArray() As String, sampName As String C09@2M' nameArray = Split(fList(0)," 0-0.txt") im"v75 tc sampName = nameArray(0) $Re
%+2c Print "" aDESO5 Print "Sample name: " & Chr(9) & sampName +{Ttv7l_2 *,u{~(thR 'Open an output file and write the FRED header data xOH@V4z: Dim outFile As String (A_9;uL^_ outFile = cDir & sampName & "_FRED.txt" ^q$sCt} Open outFile For Output As #1 Wj0([n Print #1, "type bsdf_data" ijfT!W Print #1, "format angles=deg bsdf=value scale=1" #kA+Yqy\) Y`v&YcX; 'Loop the file list, skip the two header lines and write the remaining data to file 3ly|y{M", Dim lineArray() As String, curLine As Long ~}fpe>M: For Each curFile In fList li?Gb1 Print "Merging data from file " & curFile bVym ReadFile( cDir & curFile, lineArray ) M*Xzr .6 For curLine = 2 To UBound(lineArray) z!tHn# Print #1, lineArray(curLine) O B:G5B` Next Wk?XlCj Next ~rD* Y. +9t@eHJT1 'Close the output file #+$z`C` Close #1 tfO
_b5g /}wGmX! -! Print "Finished merging RPC data for sample " & sampName ]4PG[9J@ Print "FRED formatted data file: " & Chr(9) & outFile /C"E*a End Sub :Fh*4
&Z ev`p!p 'Utility function to read the contents of a file into an array of strings. G|V ^C_: Function ReadFile(ByVal fileName As String, _ g_`8K,6ln ByRef lineArray() As String) As Long |
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~ h4U .wk ReadFile = -1 umciP Dim oFSO As Object NW$Z}?I Set oFSO = CreateObject("Scripting.FileSystemObject") xZhh%~ Erase lineArray oPi)#|jcb 2ma.zI@^u9 Dim fid As Long O1QHG'00 If oFSO.fileexists( fileName ) Then ~dv
C$ fid = FreeFile() aDs[\' Open fileName For Input As fid 7J\I%r lineArray = Split(Input(LOF(fid), fid), vbCrLf) )<+Z,6 Close fid T
^uBMDYe End If 0 }q/VH57 Set oFSO = Nothing 'n\ZmG{ Return UBound( lineArray ) *%8dW H4UnF5G End Function Q-AN~k8+)[ f?)qZPM
Sub GetFileList( ByVal in_dir As String, _ -k'=s{iy ByRef in_flist() As String ) QJxcH$ W /IyF){ 'Redimension the file list array "p<f#s} Erase in_flist 3N?uY2 mIOx)`$ 'Tracks how many files are found K}6}Opr,Tt Dim fCount As Long 8YCtU9D fCount = 0 [qc90)^Q, cdk;HK_Ve. 'Recurse directory and search for text files avdi9!J2 Dim f As String OA[w|Tt f = Dir$(in_dir & "*.txt") 7p|Pv;wp| While f <> "" ~s+\Y/@A ReDim Preserve in_flist(fCount) kIQMIL0+ in_flist(fCount) = f T. {P}#'| fCount += 1 [mX\Q`)QP f = Dir$() iidK}<o Wend ?=aQG0 ReDim Preserve in_flist(fCount-1) pDW .Pav Hh,\>= ': End Sub (xMAo;s_
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