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摘要: _I`,Br:N Z@8vL 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。 X8dR+xd 07Gv* . 背景: ?&LZB}1R 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。 g*)K/Z0pJ$ 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。 k:2QuG^ 图1. RPC Photonics工程漫射体结构及光束投射形状 R+q"_90_ RCTQhTy= O1 .w,U 步骤 hUQ,z7- I1X/Lj= 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。 GLn{s ,P'P^0qJ 图2. RPC Photonics工程漫射体不同类型的散射数据 #j#_cImE 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) IW8+_#d 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 ri`R<l8 例如下所示: +_v$!@L8 Sample name: EDF-C1-56 x:vu'A Merging data from file EDF-C1-56 0-0.txt <2!v(EkI Finished merging RPC data for sample EDF-C1-56 lf>*Y.!@me FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt GU't%[ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ]sz3]"2 a. 创建一个新的散射库 kt[:@Nda9 b. 散射模型命名 xvzr:pP c. 改变散射模型为“Tabulated BSDF”. Q6o(']0 d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) E^GHVt/. e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 >@WX>0`ht f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 7&`}~$>}>e g. 点击OK I -Xlx< 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 A*./,KT t
E` cau GV)<Q^9 脚本代码: i{!T&8 ^mAYBOE '#Language "WWB-COM" O8|5KpXd@ mrm^e9*Z Option Explicit $F.([?)k? J};z85B Sub Main d=,%=@ 2,lqsd:xM 'Cleanup LG~S8u ClearOutputWindow() ZpUCfS)|& 7 r|(}S Print "Merging RPC Photonics BSDF Data Files" ^gVT$A SetTextColor(255,0,0) c4_`Ew^k Print "Note: Script should be located in the same folder as the BSDF TXT files." P5lqSA{6 Print "Note: Do not run this script multiple times without deleting the output file between executions." iv phlw SetTextColor(0,0,0) ^:9$@+a >0{S 'Current directory of this script (should be the same as the text files being merged) 7&KT0a* Dim cDir As String /h v4x9 cDir = MacroDir$ & "\" h25G/` aNyvNEV3C 'Array which will be populated with the list of files to be merged kc/{[ME Dim fList() As String, curFile As String \%sVHt`c GetFileList( cDir, fList ) @fuM)B1" :K\mN/ x Print "" o!:8nXw Print "Files found for merging:" p8s:g~ W For Each curFile In fList Z/^ u Print Chr(9) & curFile s>0Nr Next e4~>G?rM_ }HE6aF62O 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. j)t+jcMUI Dim nameArray() As String, sampName As String tBTTCwNT% nameArray = Split(fList(0)," 0-0.txt") tpy>OT$ sampName = nameArray(0) 0l;<5 Print "" _"4xKh) Print "Sample name: " & Chr(9) & sampName `h}q
Eo` \rykBxs 'Open an output file and write the FRED header data 0Z|FZGRP Dim outFile As String FWH}j0Gj| outFile = cDir & sampName & "_FRED.txt" ^m_yf|D$ Open outFile For Output As #1 lTU$0CG Print #1, "type bsdf_data" R),zl_d_ Print #1, "format angles=deg bsdf=value scale=1" zqDR7+] RE.r4uOJg 'Loop the file list, skip the two header lines and write the remaining data to file c9R5w.t: Dim lineArray() As String, curLine As Long " P)*FT For Each curFile In fList K78rg/` Print "Merging data from file " & curFile yqSs,vz ReadFile( cDir & curFile, lineArray ) y*{Zbz#{ For curLine = 2 To UBound(lineArray) DO7W}WU Print #1, lineArray(curLine) vK$"# F~ Next N_L,]QT? Next ,@m@S^ Q-#$Aa 'Close the output file A]L%dFK Close #1 iCP/P% =h(W4scgqX Print "Finished merging RPC data for sample " & sampName 4@.|_zY Print "FRED formatted data file: " & Chr(9) & outFile : S$l"wrh\ End Sub Pmi#TW3X %p&k5:4<"# 'Utility function to read the contents of a file into an array of strings. ~x{.jn Function ReadFile(ByVal fileName As String, _ &'l>rD^o ByRef lineArray() As String) As Long zi~5l#I $8l({:*q0 ReadFile = -1 `[zQf Dim oFSO As Object pf4 ^Bk}e Set oFSO = CreateObject("Scripting.FileSystemObject") _=
#zc4U Erase lineArray ::n;VY2& t6c<kIQ:-O Dim fid As Long A?TBtAe If oFSO.fileexists( fileName ) Then @H !$[m3 fid = FreeFile() zo;^m| Open fileName For Input As fid 5>6PH+Oq lineArray = Split(Input(LOF(fid), fid), vbCrLf) 5unG#szq Close fid Q4t(@0e} End If xUF_1hY Set oFSO = Nothing ;X ,1I Return UBound( lineArray )
5-)#f? tweY'x.{ End Function _WX#a|4h{ s<x1>Q7X~ Sub GetFileList( ByVal in_dir As String, _ /S:F)MO9 ByRef in_flist() As String ) )m3q2W IPuA#C 'Redimension the file list array tU"raP^= Erase in_flist 2!N8rHRt ~}Z\:#U 'Tracks how many files are found ,n!vsIN Dim fCount As Long 4E44Hzs fCount = 0 "i:T+#i({O 2tayP@$ 'Recurse directory and search for text files iAY!oZR(WT Dim f As String hP J4Oj1O f = Dir$(in_dir & "*.txt") )o!XWh While f <> "" jClj_E ReDim Preserve in_flist(fCount) MJj4Hd in_flist(fCount) = f %7Kooq(i fCount += 1 >]'yK!a? f = Dir$() \qsw"B*tv` Wend TI y&&_p ReDim Preserve in_flist(fCount-1) m?s}QGSka U=bEA1*@0 End Sub W;?(,xx dQezd-y* TJ?g% QQ:2987619807 uhN%Aj\iu(
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