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摘要: Y]NSN-t )^m%i]L_ 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。 {. 2k6_1[ Y<mej][ 背景: /a^1_q-bX 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。 z8QAo\_I( 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。 p;._HJ( 图1. RPC Photonics工程漫射体结构及光束投射形状 33#0J$j7 z54EG:x.7^ $]{k+Jf 步骤 ~KW,kyXBnD fIj|4a+ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 q[HTnx :,Pn3xl 图2. RPC Photonics工程漫射体不同类型的散射数据 >H'4{| 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) e?opkq\f 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 'XZ)!1N 例如下所示: MOsl_^c Sample name: EDF-C1-56 BnCbon) Merging data from file EDF-C1-56 0-0.txt ])L
A42| Finished merging RPC data for sample EDF-C1-56 U 'R)x";= FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt gUxP>hB 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 4G$|Rx[{, a. 创建一个新的散射库 0(mkeIzJt/ b. 散射模型命名 +VCGlr c. 改变散射模型为“Tabulated BSDF”. D[^m{ 9_ 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 ) D$bIo" e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 hvA^n@nr f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, <z]cyXv/ g. 点击OK \<y`!"c
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 pcYG~pZ9 5#> 8MU?& : y5<go8e 脚本代码: I
6<*X )6+eNsxMlC '#Language "WWB-COM" L1ieaKw NbC@z9Q Option Explicit |55N?=8 AI,(z;{P Sub Main Q.]}]QE
1jN-4& 'Cleanup 4zJtOK?r" ClearOutputWindow() P5
K' p5}# W0epAGrB Print "Merging RPC Photonics BSDF Data Files" 3E>frR\!I SetTextColor(255,0,0) KcK>%% Print "Note: Script should be located in the same folder as the BSDF TXT files." gA:5M Print "Note: Do not run this script multiple times without deleting the output file between executions." 5Cq{XcXV SetTextColor(0,0,0) Ttxqf:OMf r41\r,`Dj 'Current directory of this script (should be the same as the text files being merged) O9EKRt Dim cDir As String JcbwDlUb cDir = MacroDir$ & "\" >S'17D 5]HS^II" 'Array which will be populated with the list of files to be merged blTo5NLX Dim fList() As String, curFile As String \RvvHty-V GetFileList( cDir, fList ) y($%;l 8"dv _`ym Print "" "\}@gV#r$A Print "Files found for merging:" Md0sK For Each curFile In fList 7VMvF/ap]u Print Chr(9) & curFile <5NF; Next =|I>G?g- c0hwc1kv- 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. `e(vH`VZ Dim nameArray() As String, sampName As String d!:6[7X6 nameArray = Split(fList(0)," 0-0.txt") HYD"#m'TkB sampName = nameArray(0) H&]gOs3So Print "" AwslWkd= Print "Sample name: " & Chr(9) & sampName >2,Gy-&"0 'bo~%WA]n 'Open an output file and write the FRED header data T}"6wywM Dim outFile As String ^}:# outFile = cDir & sampName & "_FRED.txt" +"8,Mh Open outFile For Output As #1 M-[$L XR Print #1, "type bsdf_data" _cc#Qlw 7 Print #1, "format angles=deg bsdf=value scale=1" 7.Z@Wr? S(uf(q|{ 'Loop the file list, skip the two header lines and write the remaining data to file {K9/HqH Dim lineArray() As String, curLine As Long n84GZ5O>7 For Each curFile In fList sO.`x* Print "Merging data from file " & curFile G.(mp<- ReadFile( cDir & curFile, lineArray ) ~ug=
{b For curLine = 2 To UBound(lineArray) Hd,p!_ Print #1, lineArray(curLine) e _/b2"{ Next LxpuhvIO Next ]79:yMD~ba %K>.lh@ 'Close the output file g_G6~-.9I Close #1 oiX+l5`pz cOPB2\, Print "Finished merging RPC data for sample " & sampName jcI&w#re Print "FRED formatted data file: " & Chr(9) & outFile |i ZfYi&^ End Sub aBNZdX]vzO * 1Od-3 'Utility function to read the contents of a file into an array of strings. 7DIIx}A Function ReadFile(ByVal fileName As String, _ v>Mnl ByRef lineArray() As String) As Long CT1ja.\; gS:A'@& ReadFile = -1
2'5 ]~ Dim oFSO As Object j%y$_9a7 Set oFSO = CreateObject("Scripting.FileSystemObject") "m ^'
&L Erase lineArray ~_s{0g]B rtL}W__ Dim fid As Long ,}:G\u*Fu If oFSO.fileexists( fileName ) Then bd<m%OM"" fid = FreeFile() dlG=Vq&Y Open fileName For Input As fid WdnIp! lineArray = Split(Input(LOF(fid), fid), vbCrLf) ZeEWp3vW Close fid ND5`Q"k
End If OX"j# Set oFSO = Nothing UQ[B?jc Return UBound( lineArray ) !vk|<P1 7{xh8#m End Function &[At`Nw71 KX}Rr7a Sub GetFileList( ByVal in_dir As String, _ ^k
Cn*& ByRef in_flist() As String ) ^qC;Nh4F gq"gUaz 'Redimension the file list array l983vKr Erase in_flist {U84 _Pi ]>+PnP35G 'Tracks how many files are found \4AM*lZ Dim fCount As Long sYdRh?Hq fCount = 0 J@OB`2?Zv **+e7k 'Recurse directory and search for text files KL ?@@7 Dim f As String 0d3+0EN{ f = Dir$(in_dir & "*.txt") lt_']QqU While f <> "" ~u.T- 0F ReDim Preserve in_flist(fCount) Y2O"]phi@ in_flist(fCount) = f ,:%"-`a% fCount += 1 rYp3(k3 f = Dir$() tw(JZDc Wend NNF>Xa`9, ReDim Preserve in_flist(fCount-1) UK{irU|\ VL[kJi
End Sub ru`U'
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