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摘要: XYj!nx{k, %Ya%R@b} 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。 C>wOoXjt 42]hX9E 背景: @cRR 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。 69N/_V 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。 RUco3fZ 图1. RPC Photonics工程漫射体结构及光束投射形状 =p{55dR Lz6b9W Pw+PBIGn4 步骤 :8h\x M~+}ss 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。 QP>tu1B| {G. W? 图2. RPC Photonics工程漫射体不同类型的散射数据 S1$lNB 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) x$hhH= 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 Z uFk}R"x 例如下所示:
X} {z7[ Sample name: EDF-C1-56 X\4d|VJ?m Merging data from file EDF-C1-56 0-0.txt w.X MyHj Finished merging RPC data for sample EDF-C1-56 X(Z~oGyg FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt &X3G;x2; 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 RD6n1Wb(@ a. 创建一个新的散射库 G`D rY; b. 散射模型命名 @I"&k!e<2 c. 改变散射模型为“Tabulated BSDF”. _nwsIjsW 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 ) G.")Bg 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。 RW-)({ 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, {'#1do}{ g. 点击OK wE3L,yx= 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 P K+rr.k] a_Sp}s<J /aTW X 脚本代码: JkShtLEr Nwwn #+ '#Language "WWB-COM" MpK3+4UMa 6;:z?Q Option Explicit 2x5^kN7 z( \4{Y
Sub Main OI^??joQ ^/~ZP?%] 'Cleanup b1TIVK3m ClearOutputWindow() ;NMv>1fI q\pI&B Print "Merging RPC Photonics BSDF Data Files" 9\'JtZO SetTextColor(255,0,0) mO=A50_&,Q Print "Note: Script should be located in the same folder as the BSDF TXT files." q@Aw]Kh Print "Note: Do not run this script multiple times without deleting the output file between executions." \E(^<Af SetTextColor(0,0,0) TUBpRABH CZ33|w 'Current directory of this script (should be the same as the text files being merged) ]z#+3DaH Dim cDir As String CM%Rz-c cDir = MacroDir$ & "\" 'Z*`~,Q PZ>(cvX& 'Array which will be populated with the list of files to be merged #My14u Dim fList() As String, curFile As String l"zA~W/ GetFileList( cDir, fList ) R 7h^
@ m#Ydq(0+ Print "" jj&mRF0gCb Print "Files found for merging:" bey:Qj?? For Each curFile In fList -aq3Lqi Print Chr(9) & curFile skm~~JM^ Next W:maE9E= )IVk4| 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. $Ge0<6/ Dim nameArray() As String, sampName As String "XQ3mi`y nameArray = Split(fList(0)," 0-0.txt") iE EP~ sampName = nameArray(0) z]2MR2W@X Print "" S{m:Iij[; Print "Sample name: " & Chr(9) & sampName (|\%)vH- 0tz? sN 'Open an output file and write the FRED header data aUF{57,< Dim outFile As String *sQ.y
{ outFile = cDir & sampName & "_FRED.txt" cQkj{u Open outFile For Output As #1 Mkh/+f4 Print #1, "type bsdf_data" `_k_}9Fr Print #1, "format angles=deg bsdf=value scale=1" :7M%/#Fy -{}(U 'Loop the file list, skip the two header lines and write the remaining data to file j8oX9
Yo0= Dim lineArray() As String, curLine As Long ~47 0LgpO1 For Each curFile In fList H u9nJ Print "Merging data from file " & curFile S{RRlR6Z ReadFile( cDir & curFile, lineArray ) RBz"1hRo` For curLine = 2 To UBound(lineArray) +DG-MM%\ Print #1, lineArray(curLine) 3:O|p[2)L Next 25f[s.pv8 Next `$Um /d+v4GIB 'Close the output file M]|]b-# Close #1 ,)uW`7 b#
Dd Print "Finished merging RPC data for sample " & sampName vz(=3C[ Print "FRED formatted data file: " & Chr(9) & outFile *8Su:=*b End Sub .sc80i4 &.(iS 'Utility function to read the contents of a file into an array of strings. nuDu Function ReadFile(ByVal fileName As String, _ ` ZZ3!$czR ByRef lineArray() As String) As Long _Ss}dU9 k.7!)jL7 ReadFile = -1 ALn_ifNh Dim oFSO As Object 3dz{"hV Set oFSO = CreateObject("Scripting.FileSystemObject") zB`J+r;LU Erase lineArray
:f:&B8 HE{UgU:tY Dim fid As Long rizjH+ If oFSO.fileexists( fileName ) Then yZ!~m3Q fid = FreeFile() _k :BY Open fileName For Input As fid $vK,Gugcx lineArray = Split(Input(LOF(fid), fid), vbCrLf) xbxzB<yL Close fid Y4w]jIv End If }Ml BmD Set oFSO = Nothing H
"Io!{aKU Return UBound( lineArray ) & kVa*O kOdA8XRY End Function IhBQ1,&J j D*<M/4 Sub GetFileList( ByVal in_dir As String, _ :ssj7wl : ByRef in_flist() As String ) $0x+b!_l@ w#hg_RK(Jr 'Redimension the file list array R|^bZf^ Erase in_flist V;g) P ).`v&-cK4E 'Tracks how many files are found *DvX||`& Dim fCount As Long ?(U;T!n fCount = 0 =fH5r_n $&qLrKJ 'Recurse directory and search for text files $a8,C\me? Dim f As String GLESngAl f = Dir$(in_dir & "*.txt") gG@4MXq. While f <> "" [3sZ=)G ReDim Preserve in_flist(fCount) 3=o4ncg( in_flist(fCount) = f cHVJ7yAZI fCount += 1 6;\1bP? f = Dir$() /P-#y@I Wend ES!e/l ReDim Preserve in_flist(fCount-1) ]'?Ue7 l*]hUP J End Sub D"-Wo}"8O'
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