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摘要: LdN[N^n[H zyUS$g]& 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。 r~ 2*'zB l&'q+F 背景: H"6x/&s.=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。 vc&+qI+I3 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。 a%`%("g! 图1. RPC Photonics工程漫射体结构及光束投射形状 'xGhMgR; M(LIF^'U:m C&MqH.K 步骤 hpb|| V #~"IlBk\ 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。 Zr2!}jD9a ] \_tO 图2. RPC Photonics工程漫射体不同类型的散射数据 ?X@[ibH6 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) XGH:'^o_ 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 X3kFJ{ 例如下所示: RO,TNS~ Sample name: EDF-C1-56 H>%AK'' Merging data from file EDF-C1-56 0-0.txt >19s:+ Finished merging RPC data for sample EDF-C1-56 ~$5XiY8A FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt \GxqE8 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,.>9$( s a. 创建一个新的散射库 ;M4[Liw~O b. 散射模型命名 ]Z8u0YtM) c. 改变散射模型为“Tabulated BSDF”. 3WGE T[3 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 ) Pd"c*n&9 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]aU}[s1 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, 1J"I. g. 点击OK cr{yy :D 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 sIgTSdk dR1IndZl xw
43P. 脚本代码: aq}hlA(w %bN{FKNN '#Language "WWB-COM" ?4/pE@RIy Mh-"B([Z Option Explicit 'kt6%d2 xsj,l@Ey Sub Main ]$r]GVeN}H nLz;L r! 'Cleanup Qr$
7 U6p ClearOutputWindow() RdWn =; _Fa\y ZX Print "Merging RPC Photonics BSDF Data Files" DX>LB$dy? SetTextColor(255,0,0) -6kX?sNl)X Print "Note: Script should be located in the same folder as the BSDF TXT files." Ia}qDGqPp! Print "Note: Do not run this script multiple times without deleting the output file between executions." =JzzrM|V* SetTextColor(0,0,0) :p/=KI_ %Tp
k1 'Current directory of this script (should be the same as the text files being merged) `mz}D76~# Dim cDir As String ue@/o,C> cDir = MacroDir$ & "\" JP<j4/ <1*.:CL"s 'Array which will be populated with the list of files to be merged xz!0BG Dim fList() As String, curFile As String B+Qf?1f GetFileList( cDir, fList ) SQ4^sk_! [#uhMn^ Print "" C`i#7zsH Print "Files found for merging:" `J,>#Y6(J For Each curFile In fList ^7aqe*|vm Print Chr(9) & curFile `~)?OTzU# Next Eb4NPWo pJ/]\>#5 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ,W)DQwAg Dim nameArray() As String, sampName As String ~F'6k&A^q nameArray = Split(fList(0)," 0-0.txt") k}fC58q sampName = nameArray(0) SED52$zA Print "" N)g _LL>^ Print "Sample name: " & Chr(9) & sampName B1 }-
uK" T~ 'Open an output file and write the FRED header data V_J0I*Qa4 Dim outFile As String _F6<ba}o3 outFile = cDir & sampName & "_FRED.txt" hb3:,c( Open outFile For Output As #1 -\f7qRW^U Print #1, "type bsdf_data" VU,G.eLW Print #1, "format angles=deg bsdf=value scale=1" kiM:(=5 !VWA4 e!+ 'Loop the file list, skip the two header lines and write the remaining data to file \[3~*eX6 Dim lineArray() As String, curLine As Long v3Vve:}+ For Each curFile In fList EO)JMV?6 Print "Merging data from file " & curFile "D.<~! ReadFile( cDir & curFile, lineArray ) Gb`)d For curLine = 2 To UBound(lineArray) M@{?#MkS% Print #1, lineArray(curLine) MN2i0!+ Next ZcXAqep8' Next GbQi3% L'{W|Xb+ 'Close the output file wkZwtq Close #1 Ak@!F6~ ]?VVwft Print "Finished merging RPC data for sample " & sampName 8*0QVFn$ Print "FRED formatted data file: " & Chr(9) & outFile CHKhJ v3+4 End Sub #[=kQ& f5 bq)Pm& 'Utility function to read the contents of a file into an array of strings. "
7^nRJy Function ReadFile(ByVal fileName As String, _ S3%2T ByRef lineArray() As String) As Long yk4@@kHW <K^a2 D ReadFile = -1 _ZhQY, Dim oFSO As Object /";tkad^ Set oFSO = CreateObject("Scripting.FileSystemObject") % vUU
Fub Erase lineArray f9u=h} h s',f Dim fid As Long (%L/|F_ If oFSO.fileexists( fileName ) Then >ZOlSLu fid = FreeFile() D^@@ P Open fileName For Input As fid \bd KLcKI, lineArray = Split(Input(LOF(fid), fid), vbCrLf) b69nj Close fid p($vM^_<" End If ~NK $rHwi% Set oFSO = Nothing )&O2l Return UBound( lineArray ) F&wAre< 5T#v& End Function &q<k0_5Q gJ|#xZ Sub GetFileList( ByVal in_dir As String, _ iUcX\
uW ByRef in_flist() As String ) ys=}
V| ]F+|C 'Redimension the file list array =OO4C Erase in_flist y5eEEG6 o+.L@3RT4 'Tracks how many files are found /.e7#-+? Dim fCount As Long {BJ>x:2 fCount = 0 pSlc (M> -O$vJ,* 'Recurse directory and search for text files yx|iZhK0:} Dim f As String Fqw4XR_`~ f = Dir$(in_dir & "*.txt") zF`a:dD$d While f <> "" P{A})t7 ReDim Preserve in_flist(fCount) PI*@.kqR- in_flist(fCount) = f D-{*3?x fCount += 1 j#p;XI f = Dir$() m)L50ot:/ Wend 4E.9CjN1> ReDim Preserve in_flist(fCount-1) Xsa8YP9 *90dkJZ. End Sub l[i4\ CT
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