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摘要: b,xZY1a #{cy( &cz 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。 n4K!Wv&u [X(4( 1i 背景: :viW 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。 [9; @1I<x 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。 J&xZN8jW 图1. RPC Photonics工程漫射体结构及光束投射形状 Z8|<%1Kge 7~7L5PRW MEDh 步骤 %*
"+kwZ @>2pY_ 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。 Vj*-E S_ATsG*( 图2. RPC Photonics工程漫射体不同类型的散射数据 ] ,|,/~ 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) #D`@G8~( 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 d][
Wm 例如下所示: }p)K6!J0 Sample name: EDF-C1-56 :{7+[LcH7 Merging data from file EDF-C1-56 0-0.txt s0SzO,Vi Finished merging RPC data for sample EDF-C1-56 DR#" 3 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt <Ky-3:pxeM 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 zggnDkC5 a. 创建一个新的散射库 9zp!lw~;+ b. 散射模型命名 4E$MhP
c. 改变散射模型为“Tabulated BSDF”. wI.aV> d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) /5@YZ?|#2 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 fUT[tkb/! f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, VBhUh~:Om g. 点击OK 9[0iIT$q$ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 -&Rv=q> mQ[$U {2\Y%Y'}* 脚本代码: .t8)`MU6. :/5m
D '#Language "WWB-COM" vm [lMx <L}@p8Lq Option Explicit =?i?-6M ;4F6
$T'I Sub Main gQnr. d ^bSV4 'Cleanup KOcB#UHJ ClearOutputWindow() `ecseBn3d D!j/a!MaKk Print "Merging RPC Photonics BSDF Data Files" 8g#$Y2P SetTextColor(255,0,0) PgBEe
@. Print "Note: Script should be located in the same folder as the BSDF TXT files." .;? Bni Print "Note: Do not run this script multiple times without deleting the output file between executions." O. * 0;5 SetTextColor(0,0,0) i)i>Ulj*i ~A0]vcP 'Current directory of this script (should be the same as the text files being merged) R"nB4R0Uh Dim cDir As String h]4xS?6O cDir = MacroDir$ & "\" 1T^WMn:U WtM%(8Y[] 'Array which will be populated with the list of files to be merged 74%vNKzc~ Dim fList() As String, curFile As String 0z8(9DlTc GetFileList( cDir, fList ) Eb3 ZM# "{0G,tdA Print "" 5y#,z`S Print "Files found for merging:" (.J/Ql0Y For Each curFile In fList 'E|%l!xO Print Chr(9) & curFile r%,?uim# Next qGinlE&\ #:)'D?, 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 5KCQvv\ Dim nameArray() As String, sampName As String b?~p/[ nameArray = Split(fList(0)," 0-0.txt") [|nK5(e9 sampName = nameArray(0) 3",gjXmBu Print "" so-5%S Print "Sample name: " & Chr(9) & sampName +=tdgw/ DUOoTlp 'Open an output file and write the FRED header data ?t/qaUXN Dim outFile As String oo'9ZE/% outFile = cDir & sampName & "_FRED.txt" 66=[6U9 * Open outFile For Output As #1 x9lA';}) Print #1, "type bsdf_data" 1/dL-"*0 Print #1, "format angles=deg bsdf=value scale=1" o}N@Q-i gq *D]:{#C* 'Loop the file list, skip the two header lines and write the remaining data to file w2LnY1A Dim lineArray() As String, curLine As Long y_X6{}Ke For Each curFile In fList 7[ ovEE54 Print "Merging data from file " & curFile n
Kkpp- ReadFile( cDir & curFile, lineArray ) =s\$i0A2 For curLine = 2 To UBound(lineArray) ZFZ'&"+ Print #1, lineArray(curLine) O& Y;/$w Next [4Q;(67 Next %
km<+F=~ +Mj6.X 'Close the output file 8JLf @C: Close #1 m6Dm1'+ {vu\qXmMv Print "Finished merging RPC data for sample " & sampName Fa("Gok[ Print "FRED formatted data file: " & Chr(9) & outFile 2Kxb(q" End Sub G(E1c"? **q8vhJM 'Utility function to read the contents of a file into an array of strings. fUw:jExz Function ReadFile(ByVal fileName As String, _ gM96RY ByRef lineArray() As String) As Long t=%zY~P d)
-(C1f ReadFile = -1 HUKrp*Hv Dim oFSO As Object =!TUf/O- Set oFSO = CreateObject("Scripting.FileSystemObject") Y9.3`VX Erase lineArray geQ!}zXWi .; MS78BR Dim fid As Long *@rA7zPFf If oFSO.fileexists( fileName ) Then %"
iX3 fid = FreeFile() P(T-2Ux6 Open fileName For Input As fid 5/.W-Q\pl} lineArray = Split(Input(LOF(fid), fid), vbCrLf) &h:4TaD Close fid KhjC'CU, End If Dk
`&tr Set oFSO = Nothing ^".OMS"! Return UBound( lineArray ) Du_5iuMh tZ]gVgZg End Function XYU5. c>bns/f Sub GetFileList( ByVal in_dir As String, _ jKUEs75] ByRef in_flist() As String ) poz_=,c .}__XWK5 'Redimension the file list array fU6YJs.H^8 Erase in_flist Ts!'>_<Je l b( 'Tracks how many files are found w:\} B'u Dim fCount As Long +\=g&G, fCount = 0 o2fih%p?1 V60L\?a 'Recurse directory and search for text files :9& |