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摘要: ')kn r=Up-(j 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。 xE$(I<: N/ 7Q(^ 背景: Z5 lE*z 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。 ZJCD)?]=3 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。 pIKQx5; 图1. RPC Photonics工程漫射体结构及光束投射形状 YGRv` `( J7FCW^-`3 Bnju_)U5) 步骤 L*TPLS[lh @D<q=:k 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。 Q{ hXP*5 Z x9oj 图2. RPC Photonics工程漫射体不同类型的散射数据 AS;EO[Vn 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) pBW|d\8 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 y:6&P6`dx 例如下所示: [D[&aA Sample name: EDF-C1-56 }cov"o Merging data from file EDF-C1-56 0-0.txt *>x~` Finished merging RPC data for sample EDF-C1-56 [yzDa:% FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt GfEg][f 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ';g]!XsY) a. 创建一个新的散射库 V2< 4~J2:9 b. 散射模型命名 mez )G| c. 改变散射模型为“Tabulated BSDF”. (DzV3/+p^ 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 ) Tk[`kmb 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。 s bf\;_! 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,
de.!~%D g. 点击OK cVrses^yE 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ]s3U +t? xHs8']*\ $tGk,.#j 脚本代码: .8[Db1W {VWX?Mm '#Language "WWB-COM" NXQdy g, qT(
3M9! Option Explicit
'g<0MOq{ %G~f> Sub Main B^W0Ik`m v!oXcHK/ 'Cleanup 7x
*] ClearOutputWindow() IuJj;L1 B+yr
6Q. Print "Merging RPC Photonics BSDF Data Files" `(j}2X'[ SetTextColor(255,0,0) Ra\>^W6z Print "Note: Script should be located in the same folder as the BSDF TXT files." KMsm2~P Print "Note: Do not run this script multiple times without deleting the output file between executions." /UGH7srx SetTextColor(0,0,0) 6qsT/ a?]Ow J 'Current directory of this script (should be the same as the text files being merged) [C@0&[[ Dim cDir As String H-gq0+,yE cDir = MacroDir$ & "\" E9=a+l9 W~ 6ii\ 'Array which will be populated with the list of files to be merged &%QtUPvr9 Dim fList() As String, curFile As String $0[T=9q <+ GetFileList( cDir, fList ) 7r=BGoA2E `'BvUTDyZ Print "" L_Q1:nL-0 Print "Files found for merging:" ^P&)2m:s For Each curFile In fList YN
Lc ) Print Chr(9) & curFile 3c<).aC0f Next KsZXdM/ Go>_4)jy 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. R8
1z|+c|_ Dim nameArray() As String, sampName As String b[<Q_7~2 nameArray = Split(fList(0)," 0-0.txt") 8+5-7) sampName = nameArray(0) Ip}(!D| Print "" P$MAURFm Print "Sample name: " & Chr(9) & sampName `>^2MHF3LT Q`#Y_N-h+ 'Open an output file and write the FRED header data ^:Vwblv( Dim outFile As String ve.rpF\ outFile = cDir & sampName & "_FRED.txt" w{$t:l)2, Open outFile For Output As #1
x%kS:! Print #1, "type bsdf_data" tA?P$5?-* Print #1, "format angles=deg bsdf=value scale=1" Rn={:u4 HhfuHZ< 'Loop the file list, skip the two header lines and write the remaining data to file 9;3f`DK@2k Dim lineArray() As String, curLine As Long #8.%YG For Each curFile In fList /`yb75 Print "Merging data from file " & curFile %;0Llxf" ReadFile( cDir & curFile, lineArray ) _aOisN{ For curLine = 2 To UBound(lineArray) RFyeA.
N Print #1, lineArray(curLine) 9N^&~O|1 Next ^Xjh ?+WM Next Y$8
>fv ?A7&SdJaO 'Close the output file d,j"8\@ Close #1 Z IfhC' "qEHK; Print "Finished merging RPC data for sample " & sampName \N1G5W Print "FRED formatted data file: " & Chr(9) & outFile 6yZfV7I End Sub lUXxpv1m !( xeDX 'Utility function to read the contents of a file into an array of strings. l_JPkM(mJw Function ReadFile(ByVal fileName As String, _ ZgCG'SU ByRef lineArray() As String) As Long @;m7u Y=JfV ReadFile = -1 (7w`BR9B Dim oFSO As Object @$ E&H`da Set oFSO = CreateObject("Scripting.FileSystemObject") <_&H<]t%rI Erase lineArray ajF-T=5 xk=5q|u_- Dim fid As Long F0
WM&{v If oFSO.fileexists( fileName ) Then )+2GF0% fid = FreeFile() $5aRu, Open fileName For Input As fid DZGM4|@<7Y lineArray = Split(Input(LOF(fid), fid), vbCrLf) )24r^21.q Close fid =s"_! 7 End If H3T4v1o6 Set oFSO = Nothing ^]}UyrOn Return UBound( lineArray ) "`Q~rjc$2 \4y7! End Function !gv/ jdF =}5;rK Sub GetFileList( ByVal in_dir As String, _ Gz;.?=&iF ByRef in_flist() As String ) <^+~?KDZM 0?525^ 'Redimension the file list array }
y@pAeS, Erase in_flist ]c,ttS_ L 1=HD 'Tracks how many files are found C*kGB(H7 Dim fCount As Long uNe5Mv|} fCount = 0 Rk8>Ak(/ 26|2r 'Recurse directory and search for text files Wi_5.= Dim f As String w=>~pYASH f = Dir$(in_dir & "*.txt") v5U\E`)s While f <> "" Ld>y Fb(` ReDim Preserve in_flist(fCount) :lQl;Q -e in_flist(fCount) = f .-t#wXEi fCount += 1 iK{ a9pt f = Dir$() a]^hcKo4 Wend C=L_@{^Rgb ReDim Preserve in_flist(fCount-1) p$^}g: JFe %W?}.D End Sub <H3 njv
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