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摘要: Qraa0]56 ;WhRDmT 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。 L$y~\1- U\M9sTqo 背景: 6{yn;D4 Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 ]bYmM@
FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 Jm"W+! E 图1. RPC Photonics工程漫射体结构及光束投射形状 4t>"-/ *p9k> )'J !T
9CpIM% 步骤 O2"V'( [a?bv7Kz 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 @Bn4ZFB@ KL$> j/qT 图2. RPC Photonics工程漫射体不同类型的散射数据 p"j&s 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) 6~x a^3G: 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 ef/43+F^x 例如下所示: QS1lg Sample name: EDF-C1-56 )<qL8#["U Merging data from file EDF-C1-56 0-0.txt Z'Pe%}3 Finished merging RPC data for sample EDF-C1-56 Ex
skd} FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ?Mn~XN4F_ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 9}Ge@a<j a. 创建一个新的散射库 u7j,Vc'~ b. 散射模型命名 k4E9=y? c. 改变散射模型为“Tabulated BSDF”. W=OryEV? 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 ) NytodVZ'3 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。 dczSW]% 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, sf:IA%.4t g. 点击OK *xY3F8 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 %~,Fe7#p mIqm/5 g:GywXW 脚本代码: uh \Tf5 5)5yH bS '#Language "WWB-COM" &xGpbJG V`HnFAW Option Explicit RzzU+r 7S=,# Sub Main 4jZB%tH N
Z,} v3 'Cleanup yK$aVK" ClearOutputWindow() OhlK;hvdB* fNfa.0s Print "Merging RPC Photonics BSDF Data Files" R0LWuE%eD SetTextColor(255,0,0) _*b`;{3 Print "Note: Script should be located in the same folder as the BSDF TXT files." ]cVDXLj$ Print "Note: Do not run this script multiple times without deleting the output file between executions." E'5KJn;_7 SetTextColor(0,0,0) T<NOLfk66 bf{_U%` 'Current directory of this script (should be the same as the text files being merged) GlRjbNW?Q Dim cDir As String b;#_?2c cDir = MacroDir$ & "\" ?mSZQF:d@ *ZFF$0} 'Array which will be populated with the list of files to be merged q ywl
G Dim fList() As String, curFile As String [Q J GetFileList( cDir, fList ) z(
}w| 8eYEi Print "" 1i_%1Oip Print "Files found for merging:" 5X>~39(r For Each curFile In fList #y[omla8 Print Chr(9) & curFile @^ *62 Next @+Sr~:K 78~/1- 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. c~;VvYu Dim nameArray() As String, sampName As String (@qS nameArray = Split(fList(0)," 0-0.txt") b{{ H@LTW sampName = nameArray(0) /e^) *r Print "" vqO#Z Print "Sample name: " & Chr(9) & sampName HavlN}h ~I%164B+/ 'Open an output file and write the FRED header data r;*
|^> Dim outFile As String '
i<4;=M& outFile = cDir & sampName & "_FRED.txt" 5MD'AP: Open outFile For Output As #1 4VwMl)8ic Print #1, "type bsdf_data" \Q1&w2mw Print #1, "format angles=deg bsdf=value scale=1" 3}&3{kt VmN 7a6a 'Loop the file list, skip the two header lines and write the remaining data to file "PO8 Q Dim lineArray() As String, curLine As Long D6+3f#k6 For Each curFile In fList yNn=r;FZQ Print "Merging data from file " & curFile x?0K' ReadFile( cDir & curFile, lineArray ) .XiO92d9 For curLine = 2 To UBound(lineArray) z,7;+6*=L Print #1, lineArray(curLine) U{LS_VI~ Next 3dLqlJ^7B Next /h.{g0Xc A'b$X1h 'Close the output file '5[(QM5Gi& Close #1 N:k>V4oE 5U4V_*V Print "Finished merging RPC data for sample " & sampName nvXjW@)` Print "FRED formatted data file: " & Chr(9) & outFile kR^h@@'F" End Sub 1_v\G g,M-[o=Fk 'Utility function to read the contents of a file into an array of strings. ^Jq('@ Function ReadFile(ByVal fileName As String, _ EG$-D@o\I ByRef lineArray() As String) As Long b=pk;'- R){O]<+ ReadFile = -1 ;in-)`UC! Dim oFSO As Object 2nCc(F&+? Set oFSO = CreateObject("Scripting.FileSystemObject") u a_w5o7 Erase lineArray yRl wy${EY^h Dim fid As Long ;v2eAe@7 If oFSO.fileexists( fileName ) Then l&e$:=;8 fid = FreeFile() 92A9gY Open fileName For Input As fid .Y?]r6CC/ lineArray = Split(Input(LOF(fid), fid), vbCrLf) ,+6u6 Close fid SJMbYjn0J End If ]&q<O0^' Set oFSO = Nothing W|2| v?v Return UBound( lineArray ) l'wu- zNoFM/1Vb End Function xP&7i'ag j4=iHnE; Sub GetFileList( ByVal in_dir As String, _ 1Q? RD%lkf ByRef in_flist() As String ) X#JUorGp $,U/,XA
{E 'Redimension the file list array \R]2YY`EP Erase in_flist 7(h@5 NFx%e 'Tracks how many files are found hCr,6nc C Dim fCount As Long =RRv&
"2r fCount = 0 6vE#$(n#a& OW\vbWX 'Recurse directory and search for text files M|%bxG^l Dim f As String RO/(Ldh f = Dir$(in_dir & "*.txt") ~h
Dp-R; While f <> "" bo\Ah/. ReDim Preserve in_flist(fCount) oe
6-F)+ in_flist(fCount) = f Q>Z~={" fCount += 1 g@4~, f = Dir$() S\A0gOL^ Wend
J9*;Bqzim ReDim Preserve in_flist(fCount-1) ,h'Q d<Q%h?E End Sub _LC*_LT_
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