Jg}K.1Hs 摘要: Uu 8,@W+ (xHf4[[u 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。 0'YG6(h E_e6^Sk5B( 背景: \R36w^c3 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。 !8NC# s 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。图1. RPC Photonics工程漫射体结构及光束投射形状 }|u4 W?H L|P5=/d #|&Sc_#4) :L44]K5FL 步骤 fC,:{} (0YZZ93 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。 [Zei0O 图2. RPC Photonics工程漫射体不同类型的散射数据 [I!6PGx -K9c@? 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) tg]x0#@s 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 Bp8'pj;~ 例如下所示: if|+EN% Sample name: EDF-C1-56 6f')6X'x Merging data from file EDF-C1-56 0-0.txt [W%$qZlP Finished merging RPC data for sample EDF-C1-56 P9g en6 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ),G= s Oo 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 W`\R%>$H a. 创建一个新的散射库 1%4sHSN b. 散射模型命名 h%}/Cmx[ c. 改变散射模型为“Tabulated BSDF”. 3)\8%Ox 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 ) ]o cWt3| 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。 n a9sm 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, h4q|lA6!k8 g. 点击OK O+y-}7YX 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 }VS5gxI1. Tyvtmx M /"eey(X 脚本代码: JSW^dw& G:~k.1y[ '#Language "WWB-COM" =c/wplv* N[<\>Ps|u Option Explicit D6>HN[D" $STaQ28C Sub Main {
^cV lC_ (p2K36,9m 'Cleanup `s\?w5[ ClearOutputWindow() 0NS<?p~_S bbrXgQ`s+w Print "Merging RPC Photonics BSDF Data Files" 0q&<bV:D SetTextColor(255,0,0) NR`C(^} Print "Note: Script should be located in the same folder as the BSDF TXT files." zuUW|r Print "Note: Do not run this script multiple times without deleting the output file between executions." W[Ls|<Q SetTextColor(0,0,0) N<~t3/Nm XUz3*rfs 'Current directory of this script (should be the same as the text files being merged) q@[QjGj@ Dim cDir As String z^'gx@YD*v cDir = MacroDir$ & "\" Z'"tB/=W !\7!3$w'8, 'Array which will be populated with the list of files to be merged <StN%2WQ1 Dim fList() As String, curFile As String < 1uZa GetFileList( cDir, fList ) Zl^\Q=*s Wk)OkIFR Print "" |S_eDjF Print "Files found for merging:" DGS $Ukz&T For Each curFile In fList IZpP[hov Print Chr(9) & curFile 8fl`r~bqZ Next n*2UnKaJ !@}wDt 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. kqFP)!37 Dim nameArray() As String, sampName As String wB.&}p9p nameArray = Split(fList(0)," 0-0.txt") 9[<)WQe6M sampName = nameArray(0) 3kybLOG Print "" E=nIRG|g Print "Sample name: " & Chr(9) & sampName bbE!qk;hEP '@_d(N1jTw 'Open an output file and write the FRED header data 4 o Fel.o Dim outFile As String g:hjy@ w outFile = cDir & sampName & "_FRED.txt" |?,A]|j Open outFile For Output As #1 sB7#
~pA Print #1, "type bsdf_data" .+$Q<L Print #1, "format angles=deg bsdf=value scale=1" 8WXQOo8 :tV*7S=) 'Loop the file list, skip the two header lines and write the remaining data to file =l+yA>t| Dim lineArray() As String, curLine As Long _852H$H\ For Each curFile In fList Z?h~{Mg Print "Merging data from file " & curFile ItNz}4o|d ReadFile( cDir & curFile, lineArray ) !|^|,"A) For curLine = 2 To UBound(lineArray) UtoT Print #1, lineArray(curLine) B38]~'8 Next %)1y AdG
8 Next h9}+l 8\+uec]k 'Close the output file C5o#i*| Close #1 'jWr<]3 | )K8N<n Print "Finished merging RPC data for sample " & sampName ;U/&I3dzV Print "FRED formatted data file: " & Chr(9) & outFile Z^3rLCa End Sub >g1~CEMN# 01t1Z}!y 'Utility function to read the contents of a file into an array of strings. +$ 'Zf0U Function ReadFile(ByVal fileName As String, _ D4eDHq ByRef lineArray() As String) As Long oB(?_No7 u^^[Q2LDU} ReadFile = -1 NcBIg:V\c Dim oFSO As Object rV ` #[d Set oFSO = CreateObject("Scripting.FileSystemObject") DX#Nf""Pw Erase lineArray 0CnOL!3.I p|U?86t Dim fid As Long +}Dw3;W}m If oFSO.fileexists( fileName ) Then YvaK0p0Z fid = FreeFile() 'OITI TM Open fileName For Input As fid 3dg1DR; lineArray = Split(Input(LOF(fid), fid), vbCrLf) .s?L^Z^ Close fid _>&X\`D End If =W(Q34 Set oFSO = Nothing - YEZ]:" Return UBound( lineArray ) 8V'~UzK 8'HEms End Function BtkOnbz8X Ua:}V n&! Sub GetFileList( ByVal in_dir As String, _ 5TH~.^`Fi ByRef in_flist() As String ) YL!P0o13r Wf+cDpK 'Redimension the file list array >FeX<L Erase in_flist 3#LlDC_WC qU \w= 'Tracks how many files are found y8]B:_iU9 Dim fCount As Long KjD/o?JUr fCount = 0 (p" %O {:/#Nc$5 'Recurse directory and search for text files G<L;4nA) Dim f As String 0{5w 6 f = Dir$(in_dir & "*.txt") X]ipI$'+C While f <> "" /:cd\A} ReDim Preserve in_flist(fCount) A#e%^{q$ in_flist(fCount) = f wW Lj?;bx fCount += 1 #|uCgdi f = Dir$() \[;0KV_ Wend /ixp&Z|7 ReDim Preserve in_flist(fCount-1) |