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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。 "Zu>cbE tb;u%{S 背景: <~n%=^knE 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]jCR*] 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 FCdGl 图1. RPC Photonics工程漫射体结构及光束投射形状
f J+ W4$F\y U[|o!2$ 步骤 Tzr'3m_
2 sK\.yS 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。 cS RmC n7pjj 图2. RPC Photonics工程漫射体不同类型的散射数据
gfQ1p ? 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) GU7f27p 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 @o>3
Bv. 例如下所示: ky I~ Sample name: EDF-C1-56 ?<U">8cP Merging data from file EDF-C1-56 0-0.txt L16">,5 Finished merging RPC data for sample EDF-C1-56 1ZO/R%[ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 2>/}-a 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 XvI Y=~ a. 创建一个新的散射库 V=)' CCi{ b. 散射模型命名 TnJJ& "~3b c. 改变散射模型为“Tabulated BSDF”. 5U6b\jxX 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 ) k;Ask#rs 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。 M?QX'fia 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, G3j'A{ g. 点击OK Le*gdoW . 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 hE;BT>_dn w3jcit| h
I7ur 脚本代码: 4ZtsLMwLD Xp0S '#Language "WWB-COM" 6xoCB/] 5G l:jRu Option Explicit r>g5_"FL 0ni/!}YP_ Sub Main ahg]OWn# *H~&hs>k 'Cleanup 0X}0, ClearOutputWindow() +^ `n- m USzO):o Print "Merging RPC Photonics BSDF Data Files" [}`-KpV!; SetTextColor(255,0,0) uA~?z:~= Print "Note: Script should be located in the same folder as the BSDF TXT files." 1@xdzKua1 Print "Note: Do not run this script multiple times without deleting the output file between executions." _*CbtQb5 SetTextColor(0,0,0) bVOJp% *s F[*/D/y( 'Current directory of this script (should be the same as the text files being merged) naVbcY Dim cDir As String ?<1~KLPMhY cDir = MacroDir$ & "\" &{g y{npQ F"0=r 'Array which will be populated with the list of files to be merged CvRO' Dim fList() As String, curFile As String @k)[p+)E GetFileList( cDir, fList ) $^`@ lyr a V#phP Print "" 0A')zKik Print "Files found for merging:" 96i# For Each curFile In fList .1jeD.l Print Chr(9) & curFile iC~ll!FA! Next _2w8S\ GrI<w.9X 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. czT]XF Dim nameArray() As String, sampName As String .,\^{.E nameArray = Split(fList(0)," 0-0.txt") $8`" sampName = nameArray(0) ^u> fW["[ Print "" 2b&Fu\2Dmv Print "Sample name: " & Chr(9) & sampName R)6"P?h._4 X<&Y5\%F 'Open an output file and write the FRED header data 8/R9YiY5* Dim outFile As String j[Gg[7q{y outFile = cDir & sampName & "_FRED.txt" Rw)=<XV)6 Open outFile For Output As #1 !
=*k+gpF Print #1, "type bsdf_data" A~H@0>1 Print #1, "format angles=deg bsdf=value scale=1" 5
Q/yPQN 2yV^'o) 'Loop the file list, skip the two header lines and write the remaining data to file :Z+Jt=;
Dim lineArray() As String, curLine As Long BbhC0q"J For Each curFile In fList ]A:8x`z#F Print "Merging data from file " & curFile .JV y}^Q\ ReadFile( cDir & curFile, lineArray ) cVli^*se For curLine = 2 To UBound(lineArray) Q096M 0m Print #1, lineArray(curLine) f<M!L>+M6 Next ^.c<b_(=h Next c^stfFE& U04&z 91" 'Close the output file tgY/8&$M Close #1 X'j9l4Ph7 o8~<t]Ejw Print "Finished merging RPC data for sample " & sampName " -S@R=bi Print "FRED formatted data file: " & Chr(9) & outFile J~AmRo0!k End Sub A45!hhf &Qq| 'Utility function to read the contents of a file into an array of strings. 4+MaV<!tU^ Function ReadFile(ByVal fileName As String, _ O]KQ]zN ByRef lineArray() As String) As Long b-Ru UfUn0 1p8hn!V ReadFile = -1 Z1{>"o:@ Dim oFSO As Object t\-|J SZ Set oFSO = CreateObject("Scripting.FileSystemObject") *W2o$_Hs Erase lineArray mDO! o U:bnX51D4 Dim fid As Long #3?}MC If oFSO.fileexists( fileName ) Then mJYD"WgY fid = FreeFile() B+MnT{ Open fileName For Input As fid ^Hz1z_[X@ lineArray = Split(Input(LOF(fid), fid), vbCrLf) zbj V>5 Close fid a\&g;n8jA End If +[}<u- - Set oFSO = Nothing ?in)kL Return UBound( lineArray ) D"exI] QOY{j End Function EI496bsRHm WEtPIHruyt Sub GetFileList( ByVal in_dir As String, _ Pbt7T
Q ByRef in_flist() As String ) dSe d6 J,\e@ 'Redimension the file list array J~C=o(r Erase in_flist i8S=uJ]n {W HK|l 'Tracks how many files are found O=6[/oc
' Dim fCount As Long D@kf^1G fCount = 0 {C0Y8:"` u:^sEk"Lk' 'Recurse directory and search for text files *K BaKS Dim f As String OY2u,LF9H f = Dir$(in_dir & "*.txt") *%*Bo9a/ While f <> "" |
^G38 ReDim Preserve in_flist(fCount) [s{[
.0P]+ in_flist(fCount) = f MBAj.J fCount += 1 ?!O4ia3nFk f = Dir$() LqNyi Wend "BZ@m:I6hy ReDim Preserve in_flist(fCount-1) Wg2 0H23XW PkLNIp1 End Sub wD4[UU? h1l%\ 3ZH
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