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摘要: u&1n~t` ~M`QFF 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。 LF?83P,UJ# T1c2J,+}R 背景: BL6t> 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。 8P.UB{QNe 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。 h7<Zkf 图1. RPC Photonics工程漫射体结构及光束投射形状 S/v+7oT \](IBI: U8kH'OD 步骤 Dp!3uR']p 6b4Kcl <i 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。 Px5ArSS +ia F$ 图2. RPC Photonics工程漫射体不同类型的散射数据 1ux~dP 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) {@1.2AWg 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 iJuh1+6:c9 例如下所示: LS@[O])$' Sample name: EDF-C1-56 aQ mgDF Merging data from file EDF-C1-56 0-0.txt =wHHR1e Finished merging RPC data for sample EDF-C1-56 I
<`9ANe FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt G=a.Wff 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2j8^Z a. 创建一个新的散射库 $Z(fPKRN/ b. 散射模型命名 Oi +(` c. 改变散射模型为“Tabulated BSDF”. Xm&L@2V 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 ) oB;EP 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。 betN-n- 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, ]uO 8 g. 点击OK \^2%v~
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 qW[p .jN w#g0nV"X6 &x19]?D"+ 脚本代码: jca7Cx`sm {ve86 POY '#Language "WWB-COM" Va,M9)F uZ][#[u Option Explicit ~Fv&z'R sL|lfc'bB Sub Main g=.~_&O -=,%9r 'Cleanup eSf
e
s ClearOutputWindow() [b-27\b -]"=b\Q Print "Merging RPC Photonics BSDF Data Files" 50%
|9D0?Y SetTextColor(255,0,0) TtEc~m Print "Note: Script should be located in the same folder as the BSDF TXT files." YgiwtZ5FY Print "Note: Do not run this script multiple times without deleting the output file between executions." rBLkowDP* SetTextColor(0,0,0) =ZM #_uW ^G%Bj`% 'Current directory of this script (should be the same as the text files being merged) bUbM } Dim cDir As String /l_$1<c cDir = MacroDir$ & "\" 6+"P$Ed#i ZK<kn8JJ
'Array which will be populated with the list of files to be merged G%~=hEK0 Dim fList() As String, curFile As String R<
@o]p GetFileList( cDir, fList ) (yQ]n91 Q, ~8~B VwZ_ Print "" $~c?qU Print "Files found for merging:" (UmoG For Each curFile In fList <cG .V|B Print Chr(9) & curFile [z#C&gDt Next fo~8W`H& 49n.Gc 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 7><n e|% Dim nameArray() As String, sampName As String FSv')`} nameArray = Split(fList(0)," 0-0.txt") wJ-G7V,) sampName = nameArray(0) 1L1_x'tT% Print "" <y5V],-U Print "Sample name: " & Chr(9) & sampName iK{q_f\" KpBh@S 'Open an output file and write the FRED header data 7 y}b (q= Dim outFile As String rm2"pfs outFile = cDir & sampName & "_FRED.txt" 5 (bG Open outFile For Output As #1 m)9N9Ii#) Print #1, "type bsdf_data" ~d6_ Print #1, "format angles=deg bsdf=value scale=1" R L/~E
xYC Q(h,P+ 'Loop the file list, skip the two header lines and write the remaining data to file EJY[M Dim lineArray() As String, curLine As Long p#~'xq For Each curFile In fList `HU`=a&d Print "Merging data from file " & curFile 8[5%l7's ReadFile( cDir & curFile, lineArray ) }CZ,WJz= For curLine = 2 To UBound(lineArray) EB jiSQw Print #1, lineArray(curLine) Nw $io8:d
Next c.jq?Q k Next =Run nW+rJ 'Close the output file pHFlO!#]| Close #1 o+{}O_r +(3"XYh Print "Finished merging RPC data for sample " & sampName 5}
|O Print "FRED formatted data file: " & Chr(9) & outFile {;^booq End Sub ]YkF^Pf!v .E!7}O6 'Utility function to read the contents of a file into an array of strings. $+Ke$fq.> Function ReadFile(ByVal fileName As String, _ w=\Lw+X ByRef lineArray() As String) As Long |o~<Ti6] g.aNITjP ReadFile = -1 OqUEj 0X Dim oFSO As Object ~jAOGo/&6 Set oFSO = CreateObject("Scripting.FileSystemObject") XP5q4BM Erase lineArray 0K7]<\) 65AXUTg Dim fid As Long =N01!?{ If oFSO.fileexists( fileName ) Then (FZL> fid = FreeFile() ^ cN- Open fileName For Input As fid *JGm lineArray = Split(Input(LOF(fid), fid), vbCrLf) b_ Sh#d& Close fid >JS\H6 End If n"Ec %n Set oFSO = Nothing u,[Yaw"L Return UBound( lineArray ) M]!\X6<_ ;&e5.K+.Z End Function w( `X P Mo
&Ia6^ Sub GetFileList( ByVal in_dir As String, _ ,HS\(Z ByRef in_flist() As String ) !.iu_xJ R6dw#;6{I 'Redimension the file list array 0*VRFd4 Erase in_flist Cca(
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'Tracks how many files are found +xRja(d6 Dim fCount As Long i\2MphS fCount = 0 AQ. Y-'\t tr7FV1p 'Recurse directory and search for text files lW'6rat Dim f As String 7^Uv1ezDR f = Dir$(in_dir & "*.txt") TJ7on.; While f <> "" Svn|vH ReDim Preserve in_flist(fCount) `Q1T-H_ in_flist(fCount) = f gj\r>~S fCount += 1 KJ,{w?p~
) f = Dir$() '1ff| c!x9 Wend N::_JH?^= ReDim Preserve in_flist(fCount-1) >!E:$;i@ gm8L5c
V End Sub IkH]W!_+
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