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摘要: ggR--`D[ ,%a7sk<5k 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。 8%;K#,> 5v
uB87` 背景: ~il{6Z+#n 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。 e~wJO~ 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。 5r$X 图1. RPC Photonics工程漫射体结构及光束投射形状 C<?Huw4R0 <e:2DB& ^ld?v 步骤 w|uO)/v (DW[#2\. 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 W?B(Jsv N%,!&\L 图2. RPC Photonics工程漫射体不同类型的散射数据 v\UwL-4[ 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) i{$h]D_fD 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 Po:)b 例如下所示: # XD-a Sample name: EDF-C1-56 -a}d
@& Merging data from file EDF-C1-56 0-0.txt 08!pLE Finished merging RPC data for sample EDF-C1-56 N{f4-i~ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt +[DL]e]@U 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 y<<:6OBj a. 创建一个新的散射库 %qM3IVPK)q b. 散射模型命名 v.ftfL! c. 改变散射模型为“Tabulated BSDF”. +cw;a]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 ) _(q|W3 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。 r95l.v 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, e[lRY>Pe5 g. 点击OK $6c8<!B_ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "F*'UfOwrZ Wy'H4Rg8 INyakAmJ}- 脚本代码: y'9
bs :!wdqn '#Language "WWB-COM" r`THOj\cM Y68T&swD Option Explicit r="wd J:YFy-[w( Sub Main WaVP+Ap }/%(7Ff{ 'Cleanup }wJDHgt]-p ClearOutputWindow() <V3N!H_d H nRd Print "Merging RPC Photonics BSDF Data Files" mkCv
f SetTextColor(255,0,0) Y2DR
oQ Print "Note: Script should be located in the same folder as the BSDF TXT files." 4I>I Print "Note: Do not run this script multiple times without deleting the output file between executions." 0#}@-e SetTextColor(0,0,0) _%)v9}D DO!?]" 'Current directory of this script (should be the same as the text files being merged) mxYsP6& Dim cDir As String dJh T}"x cDir = MacroDir$ & "\" !KUV,>L 0aMw 'Array which will be populated with the list of files to be merged Ba$Ibq,r/ Dim fList() As String, curFile As String GHMoT GetFileList( cDir, fList ) g2=5IU< (]|rxmycA Print "" 0Wf,SYx`s Print "Files found for merging:" T5eXcI0t For Each curFile In fList >qJRpO Print Chr(9) & curFile {=AK| Next 4JTFdbx o,!r t1&0 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. V}l>p? Dim nameArray() As String, sampName As String QY,.| nameArray = Split(fList(0)," 0-0.txt") HR85!S` sampName = nameArray(0) 8
0>qqz Print "" .TN9N Print "Sample name: " & Chr(9) & sampName a*}ZT,V CW(]6s u{ 'Open an output file and write the FRED header data zS*X9|p Dim outFile As String \ORNOX: outFile = cDir & sampName & "_FRED.txt" =TDK$Ek Open outFile For Output As #1 ]_S&8F}| Print #1, "type bsdf_data" D?u*^?a2 Print #1, "format angles=deg bsdf=value scale=1" M]?#]3XBNo ! K~PH 'Loop the file list, skip the two header lines and write the remaining data to file Ks.pb !r Dim lineArray() As String, curLine As Long K8.=bGyg For Each curFile In fList "}i\"x;s Print "Merging data from file " & curFile ;as4EqiK ReadFile( cDir & curFile, lineArray ) llbj-9OZL For curLine = 2 To UBound(lineArray) 8v6YOG"b
q Print #1, lineArray(curLine) :^DuB_ Next S6 F28 d[j Next R{~Yh.)~ xf8C$|, 'Close the output file 8>TDrpT} Close #1 9-DDly [)4 Kc= &jCn Print "Finished merging RPC data for sample " & sampName @0q%&v0 Print "FRED formatted data file: " & Chr(9) & outFile .(tga&] End Sub goi5I(yn^ +Io[o6* 'Utility function to read the contents of a file into an array of strings. -Cxk#-sb# Function ReadFile(ByVal fileName As String, _ d ,| W ByRef lineArray() As String) As Long odPq<'V|AY DfFsCTu ReadFile = -1 8t!/Op? Dim oFSO As Object 4/$ $?w4 Set oFSO = CreateObject("Scripting.FileSystemObject") lHwQ'/r Erase lineArray M3j_sd'N |1G /J[E Dim fid As Long "
1YARGu If oFSO.fileexists( fileName ) Then Zqke8q fid = FreeFile() s@C@q(i6 Open fileName For Input As fid C8%Io l lineArray = Split(Input(LOF(fid), fid), vbCrLf) l6.z-Qw Close fid $u`y End If |q5R5mQ Set oFSO = Nothing h_4o4# Return UBound( lineArray ) xI}h{AF7 UBp0;)- End Function )/h~csy:~ xtyzy@)QL Sub GetFileList( ByVal in_dir As String, _ c *(]pM ByRef in_flist() As String ) ]R/VE"- ]sJWiIe. 'Redimension the file list array XM$r,}B k Erase in_flist +2=N#LM -tWkN^j8+ 'Tracks how many files are found zp>q$e40 Dim fCount As Long <;:M:{RZY fCount = 0 I ;N)jj`b dV<|ztv 'Recurse directory and search for text files s4bLL Dim f As String +5Yc/Qp f = Dir$(in_dir & "*.txt") "q4c[dna While f <> "" ++-\^'&1 ReDim Preserve in_flist(fCount) #uJGXrGt= in_flist(fCount) = f yzW9A=0A) fCount += 1 }wrZP}zM> f = Dir$() RuDn1h#u{ Wend S+A'\{f ReDim Preserve in_flist(fCount-1) ig^9lM' mmm025. End Sub E_]L8UC;m
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