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摘要: m.D8@[y s#^0[ Rt 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。 MG?,,8s O oJa}NH
背景: ^yW['H6V 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。 \Oq2{Sx\ 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。 /EjXyrn2 图1. RPC Photonics工程漫射体结构及光束投射形状 M-@RgWvF G_+/ e]P cZVx4y%kz 步骤 pX&bX_F{ z"f@iJX?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。 Ta\F~$M DO~
D?/ia 图2. RPC Photonics工程漫射体不同类型的散射数据 'V]C.`9c 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ~vXbh(MX 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 f1vD{M; 例如下所示: F\eQV< Sample name: EDF-C1-56 }u;K<<h: Merging data from file EDF-C1-56 0-0.txt Jl_W6gY"Z Finished merging RPC data for sample EDF-C1-56 Z5t^D| FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 0OO[@Ht 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 t=B1yvE" a. 创建一个新的散射库 v~ >Bbe b. 散射模型命名 F^GNOD3J c. 改变散射模型为“Tabulated BSDF”. P*KIk~J d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Lg<h54X e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 7(}'jZ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, /4T6Z[=s g. 点击OK '~Y@HRVL@| 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 /ZyMD(_J Ao\P|K9MyL wN.S] 脚本代码: u\ _yjv# ]hV!lG1_ '#Language "WWB-COM" X):7#x@uy >ZJ]yhbhK Option Explicit Hs)Cf)8u Nvd(?+c Sub Main X,G<D} 4x6n,:; 'Cleanup P")I)>Q6 ClearOutputWindow() ,ayEZ#4.m i D 9 */ Print "Merging RPC Photonics BSDF Data Files" <|l}@\iRX SetTextColor(255,0,0) W yM1s+@ Print "Note: Script should be located in the same folder as the BSDF TXT files." z%
bH?1^o Print "Note: Do not run this script multiple times without deleting the output file between executions." jfG of* SetTextColor(0,0,0) JOuyEPy 8?iI;( 'Current directory of this script (should be the same as the text files being merged) Xqw}O2QQ1 Dim cDir As String _^W;J/He cDir = MacroDir$ & "\" JlYZ\ pl).U#7` 'Array which will be populated with the list of files to be merged B>nj{W<o Dim fList() As String, curFile As String 6FzB-], GetFileList( cDir, fList ) [2-n*a(q KRL.TLgq) Print "" ?Kgb-bXB Print "Files found for merging:" l WYp For Each curFile In fList :|n[z jK/S Print Chr(9) & curFile 'S3<' X Next LWCFCkx% :EOai%i 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. S L
5k^| Dim nameArray() As String, sampName As String Zp)=l Td nameArray = Split(fList(0)," 0-0.txt") s|WwBT sampName = nameArray(0) Dnd; N/9 Print "" ]L~NYe9 Print "Sample name: " & Chr(9) & sampName (T*$4KGV 7_\F$bp` 'Open an output file and write the FRED header data O2 >c|=# Dim outFile As String u{DEOhtI4 outFile = cDir & sampName & "_FRED.txt" d1/WUKmbZ Open outFile For Output As #1 MS\vrq'_ Print #1, "type bsdf_data" y.lWyH9 Print #1, "format angles=deg bsdf=value scale=1" {A/^;X{N^ n725hY6}<l 'Loop the file list, skip the two header lines and write the remaining data to file bg Ux&3 Dim lineArray() As String, curLine As Long zx%WV@O9 For Each curFile In fList ['o ueOg Print "Merging data from file " & curFile Mw0>p5+ cy ReadFile( cDir & curFile, lineArray ) yD~,+}0) For curLine = 2 To UBound(lineArray) 4fsd5# Print #1, lineArray(curLine) ketp9}u Next _CHzwNU Next 3q'AgiW ;~<To9O 'Close the output file 3'.@aMA@ Close #1 l^	d 1<G+KC[F Print "Finished merging RPC data for sample " & sampName o{y}c-> Print "FRED formatted data file: " & Chr(9) & outFile K ~mUO End Sub jae9!Wi I Id4w~| 'Utility function to read the contents of a file into an array of strings. -g~+9/;n Function ReadFile(ByVal fileName As String, _ ^i%S}VK ByRef lineArray() As String) As Long gbuh04#~ c9nR&m8(+ ReadFile = -1 h&i*=&<HP6 Dim oFSO As Object 1*=ev,Z Set oFSO = CreateObject("Scripting.FileSystemObject") sm-[=d%@L Erase lineArray JVuju$k &MSU<S?1 Dim fid As Long M?lh1Yu" If oFSO.fileexists( fileName ) Then H<Sf0>OA fid = FreeFile() `sKyvPtG Open fileName For Input As fid M,fL(b;2 lineArray = Split(Input(LOF(fid), fid), vbCrLf) Oin9lg-jR Close fid =3X>Ur End If :$"{-n Set oFSO = Nothing I&+.I K_ Return UBound( lineArray ) JjS+'A$A5 -F7F 6!s End Function 1*8;)#%& 4SI~y;c) Sub GetFileList( ByVal in_dir As String, _ ~W21%T+ ByRef in_flist() As String ) hty'L61\z w!"L\QT 'Redimension the file list array `0NU
c)` Erase in_flist (S!UnBb& Q~]oN 'Tracks how many files are found (%fQhQ Dim fCount As Long ~Y/A]N86, fCount = 0 geR
:FO;\ fi
HE`]0 'Recurse directory and search for text files ;}+M2Ec51 Dim f As String ,LA'^I? f = Dir$(in_dir & "*.txt") (C.
$w While f <> "" y5sH7`2+5 ReDim Preserve in_flist(fCount) 2G~{x7/[@ in_flist(fCount) = f D;!sH?J@+ fCount += 1 2uEI@B f = Dir$() /f[Ek5/-0 Wend >B{qPrmI ReDim Preserve in_flist(fCount-1) XKTDBaON qO"QSSbZqQ End Sub U(f@zGV
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