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摘要: BWQ
(>Z" }_Jai4O 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。 \:O5, wf2 U?@UIhtM| 背景: sLB{R#Pt 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。 9C`Fd S 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。 .YLg^JfZ 图1. RPC Photonics工程漫射体结构及光束投射形状 YK_a37E{F \|wVIi ?hmj0i;XC 步骤 Ag}>gbz~G Hk.+1^?% 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。 8$@gAlI^ B Q".$(c
q 图2. RPC Photonics工程漫射体不同类型的散射数据 oIf-s[uH 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[P 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 8R-?x/: 例如下所示: YY$K;t{dk Sample name: EDF-C1-56 9[8?'`m Merging data from file EDF-C1-56 0-0.txt 5 {'%trDEy Finished merging RPC data for sample EDF-C1-56 Cee?%NaTS FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt gLu#M:4N 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 |-2,k#| a. 创建一个新的散射库 #,GpZ b. 散射模型命名 iPI6 _h c. 改变散射模型为“Tabulated BSDF”. *mq+w & d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) t;ggc{ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 C>t1~^Q},9 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, : h-N g. 点击OK lSQANC' 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 d}IVYI '7wWdq a i}8+L8- 脚本代码: }vp\lKP OTalR;:]r '#Language "WWB-COM" J/ <[irC ]cFqKs Option Explicit ]<TgBo| p Sc<3OI Sub Main -/KVZ t'FY*|xk 'Cleanup piY=(y&3 ClearOutputWindow() WG(tt. A1Rt Print "Merging RPC Photonics BSDF Data Files" ezy0m}@ SetTextColor(255,0,0) [u/g =^+u Print "Note: Script should be located in the same folder as the BSDF TXT files." &LHQ)? Print "Note: Do not run this script multiple times without deleting the output file between executions." 8?P@<Do% SetTextColor(0,0,0) >qCUs3}C{* S}ZM;M 'Current directory of this script (should be the same as the text files being merged) e9"<.:& Dim cDir As String ADlPdkmym cDir = MacroDir$ & "\" v8_HaA$5Y UiF ?Nx~ 'Array which will be populated with the list of files to be merged +'Tr>2V Dim fList() As String, curFile As String )7O4j}B){ GetFileList( cDir, fList ) vM|?;QM MS><7lk- Print "" [2.pZB Print "Files found for merging:" ~kw[Aw3?D\ For Each curFile In fList 'Pr(7^ Print Chr(9) & curFile pA4oy Next l9?]t; Y <Ta2H 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. A)s Dim nameArray() As String, sampName As String YD7i6A nameArray = Split(fList(0)," 0-0.txt") -=5z&)
X sampName = nameArray(0) 8H3|^J Print "" 2o?!m2W Print "Sample name: " & Chr(9) & sampName ,W7\AY07] 3($%A GKJ 'Open an output file and write the FRED header data W}.;]x%1B Dim outFile As String bgL`FW i3 outFile = cDir & sampName & "_FRED.txt" z(K[i?& Open outFile For Output As #1 h+}`mi Print #1, "type bsdf_data" 69TQHJ[ Print #1, "format angles=deg bsdf=value scale=1" k9'%8(7M: pZ%/;sxYa 'Loop the file list, skip the two header lines and write the remaining data to file $kvF]|<bu Dim lineArray() As String, curLine As Long {pE")O7~P For Each curFile In fList eHm! Print "Merging data from file " & curFile j+w*Absh ReadFile( cDir & curFile, lineArray ) D />REC^ For curLine = 2 To UBound(lineArray) 3zGxe- Print #1, lineArray(curLine) Vv0dBFe Next 0:Yz'k5 Next =-1d m+P <s)+V6\E 'Close the output file M
E4MZt:> Close #1 $ZH$x3; l7
j3;Ly Print "Finished merging RPC data for sample " & sampName _{TGO
jZr Print "FRED formatted data file: " & Chr(9) & outFile rhHX0+ End Sub q --NLm@; 2.Th29] 'Utility function to read the contents of a file into an array of strings. wVP{R3 Function ReadFile(ByVal fileName As String, _ P`cEu6: ByRef lineArray() As String) As Long t8E'd:pE `.>2h}op ReadFile = -1 yf2U-s Dim oFSO As Object )g(2xUk-y Set oFSO = CreateObject("Scripting.FileSystemObject") JyvXNV, Erase lineArray :L&- c<r`E Dim fid As Long aM,>LKNbQ If oFSO.fileexists( fileName ) Then %j^[%&pT fid = FreeFile() #3f\,4K5 Open fileName For Input As fid =X2 Ieb lineArray = Split(Input(LOF(fid), fid), vbCrLf) dNB56E)5`J Close fid qXn%c" End If xbxU`2/ Set oFSO = Nothing ?tQUZO Return UBound( lineArray ) TGY^,H>J %AF~Ki End Function _6;T
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W! Sub GetFileList( ByVal in_dir As String, _ hIuKs5` ByRef in_flist() As String ) D"El6<3)h ;sT7c1X^! 'Redimension the file list array X25cU{ Erase in_flist &$ia#j{l .-k\Q}D 'Tracks how many files are found hvnZ
2x.?d Dim fCount As Long Sx5r u?$. fCount = 0 ]HgAI$aA, lCr 'Recurse directory and search for text files rgWGe6;! Dim f As String J0~Ha u f = Dir$(in_dir & "*.txt") '3 xvQFg While f <> "" "i<i.6| ReDim Preserve in_flist(fCount) O{y2tz3 in_flist(fCount) = f -4mUGh1dy fCount += 1 U{"&Jj f = Dir$() \(R(S!xr_
Wend Z,.*!S=?h ReDim Preserve in_flist(fCount-1) rQC{"hS1 hub1rY|No End Sub ]d&6 ?7 !>
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