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q>oH(A 5nIlG 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。 g[+Q~/yq f?I *`~k 背景: U4I` xw' 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。 >\x
39B 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。 =X'7V}Q} 图1. RPC Photonics工程漫射体结构及光束投射形状 ^3s&90 M[N.H9 :Ty*i 步骤 iBW6<2@oZF =sVt8FWGY 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。 "@?kxRn! 8t
\> 图2. RPC Photonics工程漫射体不同类型的散射数据 o[ W3/ 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) _5`S)G{ 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 l%5%oN`4 例如下所示: ]@}BdMlHp Sample name: EDF-C1-56 ?v~3zHK Merging data from file EDF-C1-56 0-0.txt /%w[q:..h Finished merging RPC data for sample EDF-C1-56 R'HA>?D FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 0BD((oNg 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ;<R_j%* a. 创建一个新的散射库 ga9:*G!b{) b. 散射模型命名 0lh6b3tdP c. 改变散射模型为“Tabulated BSDF”. >^HTghgRD 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 ) 8mddI 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。 cyeDZ) 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, r:rJv g. 点击OK ,T[
+omo 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 %Z0S"B 3 9yAu<a ]7
mSM 脚本代码: M:f=JuAx 80>!qG '#Language "WWB-COM" *%BI*p R*C+Yk)Tkt Option Explicit "
CoR?[,x 5FKd{V' Sub Main g}KZL-p4\m xmx;tq 'Cleanup g$LwXfg ClearOutputWindow() @&yj7-] oF^hq-xcP Print "Merging RPC Photonics BSDF Data Files" )B4c;O4t SetTextColor(255,0,0) rL"k-5>fd Print "Note: Script should be located in the same folder as the BSDF TXT files." vBnHG-5;P Print "Note: Do not run this script multiple times without deleting the output file between executions." Bz~h- SetTextColor(0,0,0) 3mz>Y*^?0 `:O.g9 'Current directory of this script (should be the same as the text files being merged)
,^C;1ph Dim cDir As String DK%eFCo<~ cDir = MacroDir$ & "\" T
bWZw 4 Z)]Cq*3 'Array which will be populated with the list of files to be merged $O!<Zz Dim fList() As String, curFile As String =(\!,S' GetFileList( cDir, fList ) AE
_~DZ:%c +[`%b3N k Print "" 0E1)&f Print "Files found for merging:" >L4$DKO For Each curFile In fList bOKNWI Print Chr(9) & curFile _3[BS9 Next tpK4 gjf +,>bpp1 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 5C?1`-&65V Dim nameArray() As String, sampName As String ir#^5e@ nameArray = Split(fList(0)," 0-0.txt") *X=-^\G sampName = nameArray(0) Ka{Zoi] Print "" E1_4\S*z Print "Sample name: " & Chr(9) & sampName czRh.kz, >FNt*tX<0 'Open an output file and write the FRED header data cf!R Dim outFile As String 4*W7{MPY outFile = cDir & sampName & "_FRED.txt" ztpb/9J9 Open outFile For Output As #1 iKY&gnu" Print #1, "type bsdf_data" .5xg;Qg\Y Print #1, "format angles=deg bsdf=value scale=1" gK#w$s50
(5_(s`q. 'Loop the file list, skip the two header lines and write the remaining data to file ~!kbB4`WK Dim lineArray() As String, curLine As Long
@eWx4bl For Each curFile In fList k>`X!
" Print "Merging data from file " & curFile sA.yb,Fw ReadFile( cDir & curFile, lineArray ) Km-B=6*QY For curLine = 2 To UBound(lineArray) <
.!3yy Print #1, lineArray(curLine) 'h6RZKG T Next _3S{n=9 Next 1 Y&d%AA _I!&w!3oM 'Close the output file *Rd&4XG Close #1 Qrh9JFqdG6 DM9 5Il[/ Print "Finished merging RPC data for sample " & sampName nj$K4_ Print "FRED formatted data file: " & Chr(9) & outFile gKCIfxM End Sub qQ_QF qT4s*kqr 'Utility function to read the contents of a file into an array of strings. Y)`+u#`
R Function ReadFile(ByVal fileName As String, _ ?Dm&A$r ByRef lineArray() As String) As Long p'*UM%@SIY 9h{G1XL ReadFile = -1 ]'q<wPi Dim oFSO As Object rpmDr7G Set oFSO = CreateObject("Scripting.FileSystemObject") P'8E8_M} Erase lineArray _?ZT[t<
U<b!$"P9 Dim fid As Long -E7\.K3 If oFSO.fileexists( fileName ) Then T_WQzEL^ fid = FreeFile() }UrtDXhA Open fileName For Input As fid |.A>0-']M lineArray = Split(Input(LOF(fid), fid), vbCrLf) d,)L, J Close fid j^.P=; End If O}Jb,?p Set oFSO = Nothing C0RwW??t Return UBound( lineArray ) o[6hUX0tN i`~y%y End Function Gf?KpU [>;O'> Sub GetFileList( ByVal in_dir As String, _ U VT8TN-T ByRef in_flist() As String ) & \m\QI $c-3Q|C 'Redimension the file list array sq_:U_tJ Erase in_flist ]Gr'Bt / MYDSkW 'Tracks how many files are found 5h1j.t! Dim fCount As Long G u=Rf`o fCount = 0 l-
l}xBf _OY ;SJ( 'Recurse directory and search for text files =%L^!//c Dim f As String L*z;-, f = Dir$(in_dir & "*.txt") 4jpF^&y7u^ While f <> "" ;IT^SHym ReDim Preserve in_flist(fCount) RjDFc:bB in_flist(fCount) = f yrjm0BM# fCount += 1 u2t<auE9^ f = Dir$() 2Y+*vN s3 Wend i]nE86.;
ReDim Preserve in_flist(fCount-1) zin,yJ Nd6z81 End Sub Aq"_hjp
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