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摘要: [.&[<!,. g~)3WfC$[ RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 ArXl=s';s4 J\A8qh8 背景: B^q<2S; Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 ~ffwLgu!
FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 qqvF-mDN 图1. RPC Photonics工程漫射体结构及光束投射形状 >rf5)Y~f (p,}'I#i* 8Z8Y[p 步骤 C6^j#rl
.8H}Lf\ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 >|
m.?{^ ab4LTF| 图2. RPC Photonics工程漫射体不同类型的散射数据 mi^hvks< 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) mH\@QdF 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 1;&T^Gdj 例如下所示: PGX+p+wB Sample name: EDF-C1-56 CDCC1B G" Merging data from file EDF-C1-56 0-0.txt hY=I5[* Finished merging RPC data for sample EDF-C1-56 6+PGwCS FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Gru ALx7 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 X| <yq a. 创建一个新的散射库 i0ybJOa4 b. 散射模型命名 }0{B c. 改变散射模型为“Tabulated BSDF”. E{>`MNj d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) KlO(o#&N e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Ekjf^Uo f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, >S.91!x g. 点击OK R|Y~u* D 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 0p3vE,pF uvv.WbZ 1VLLo~L% 脚本代码: Kz[BB@[ o,
LK[Q '#Language "WWB-COM" <'2u
a w+_Wc~f Option Explicit HcO5?{2 Ub)M*Cq0(o Sub Main p(?3
V @q)E=G1<o0 'Cleanup fSI %c3 ClearOutputWindow() c<tmj{$
d?7BxYaa Print "Merging RPC Photonics BSDF Data Files" =P]GPEz_ SetTextColor(255,0,0) b n-=fb( Print "Note: Script should be located in the same folder as the BSDF TXT files." 40.AM1Z0f Print "Note: Do not run this script multiple times without deleting the output file between executions." }n[Bq# SetTextColor(0,0,0) WG%2<Q^ n7DLJ`ho{ 'Current directory of this script (should be the same as the text files being merged) (\&
62B1 Dim cDir As String )!,@m>0v{ cDir = MacroDir$ & "\" ]l&'k23~p OX3Xy7 'Array which will be populated with the list of files to be merged V6*?$o Dim fList() As String, curFile As String *"T+G*~ GetFileList( cDir, fList ) TQ-KkH}y a8QfkOe Print "" S:GTc QU Print "Files found for merging:" Q>%E`h For Each curFile In fList veO?k.u( Print Chr(9) & curFile |j#
^@R Next **HrWM%?8o gh61H:t kR 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Zs73
ad Dim nameArray() As String, sampName As String T#r=<YH[C nameArray = Split(fList(0)," 0-0.txt") H:MUNc8i sampName = nameArray(0) dEET}s\ Print "" /.@x
4cdS Print "Sample name: " & Chr(9) & sampName xVTo4-[p iAHZ0Du 'Open an output file and write the FRED header data e^WqJ7j Dim outFile As String ArX]L$D outFile = cDir & sampName & "_FRED.txt" 'M-)Os" Open outFile For Output As #1 r0u J$/! Print #1, "type bsdf_data" D6:DrA: Print #1, "format angles=deg bsdf=value scale=1" `u=oeM: k.Gl4
x 'Loop the file list, skip the two header lines and write the remaining data to file wPQ&Di*X} Dim lineArray() As String, curLine As Long nF|Oy0 For Each curFile In fList C[0MA ,^ Print "Merging data from file " & curFile ]_\AHnJ ReadFile( cDir & curFile, lineArray ) MYu`c[$jZ For curLine = 2 To UBound(lineArray) J@gm@ jLc Print #1, lineArray(curLine) A$ J9U3+O Next *?p
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Next wBE7Bv45 ?61L|vr 'Close the output file XJ O[[G` Close #1 hd8B0eD' uct=i1+ fE Print "Finished merging RPC data for sample " & sampName V07VwVD Print "FRED formatted data file: " & Chr(9) & outFile wePI*."] End Sub 9p4%8WhJ Xout:dn 'Utility function to read the contents of a file into an array of strings. pbPz$Y Function ReadFile(ByVal fileName As String, _ ^glX1 ) ByRef lineArray() As String) As Long ovB=Zm . Jptj ReadFile = -1 %uj[ ` Dim oFSO As Object *.:! Ax Set oFSO = CreateObject("Scripting.FileSystemObject") D$QGL I9( Erase lineArray o>.AdZby k~{Fnkt Dim fid As Long Shs')Zsbv If oFSO.fileexists( fileName ) Then `|&\e_"DE fid = FreeFile() gji*Wq Open fileName For Input As fid q ?(A!1(u lineArray = Split(Input(LOF(fid), fid), vbCrLf) R9Ldl97' Close fid A0S8Dh$ End If U&`6&$] Set oFSO = Nothing pa>p% Return UBound( lineArray ) =Y/}b\9`T o1Ne+Jt End Function PL9<*.U"= '^8g9E.4K Sub GetFileList( ByVal in_dir As String, _ FMoJ"6Q ByRef in_flist() As String ) Fs?( UM *+NGi(N 'Redimension the file list array ?Y%}(3y Erase in_flist uFz/PDOZ@
0K&_D) 'Tracks how many files are found BHEs+e0 Dim fCount As Long 4tbw*H5!5 fCount = 0 o1
jk= x6"/z 'Recurse directory and search for text files SRP5P,- y Dim f As String )>ug{M%g f = Dir$(in_dir & "*.txt") >Dk1axZ!>/ While f <> "" O'"YJ, ReDim Preserve in_flist(fCount) H~~7~1"x in_flist(fCount) = f &,^mM'
C fCount += 1 c$@`P f = Dir$() G%xb0%oi]% Wend lq; ReDim Preserve in_flist(fCount-1) ll^Th > &B?@@6 End Sub OD{5m(JwL
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