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摘要: 0_faJjTbP; uMe]].04 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。 1US4:6xX_ wm/=]*jpK 背景: W #kOcw 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。 yJAz#~PO/ 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。 u
=%1%p, 图1. RPC Photonics工程漫射体结构及光束投射形状 bs=x>F 9s'[p'[Z j>-O'CO 步骤 YRm6~c V1Opp8 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。 Ryrvu 1 k i917d@r( < 图2. RPC Photonics工程漫射体不同类型的散射数据 ?m>!P@
M 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) 48Z0aA~+ 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 -'mTSJ.} 例如下所示: UiLiy?EJ Sample name: EDF-C1-56 (TJ )Y7E Merging data from file EDF-C1-56 0-0.txt OkaNVTB Finished merging RPC data for sample EDF-C1-56 rsgTd\b FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt /I/gbmc) 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ~dc~<hK a. 创建一个新的散射库 J-wF2*0r< b. 散射模型命名 8\{1y:| c. 改变散射模型为“Tabulated BSDF”. <UC_QPA\ 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 ) &3_.k 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。 7I`8r2H 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, yz7X7mAo g. 点击OK QpZCU] 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 7)#8p@Q =AIeYUh ydm2'aV 脚本代码: `8sC>)lrwu EAPjQA-B? '#Language "WWB-COM" $"[5]{'J `!A<XiAOmM Option Explicit lrL:v~g l" P3lKS Sub Main "|KhqV=?v /\0g)B;] 'Cleanup \]=''C=J ClearOutputWindow() MGU%"7i'} zo>@"uH4 Print "Merging RPC Photonics BSDF Data Files" g<(\# F}/ SetTextColor(255,0,0) j}fu|- Print "Note: Script should be located in the same folder as the BSDF TXT files." e"O c Print "Note: Do not run this script multiple times without deleting the output file between executions." <*F!A' w2o SetTextColor(0,0,0) 3yw`%$d5 bc}BQ|Q 'Current directory of this script (should be the same as the text files being merged) @&xWd{8' Dim cDir As String #<*=) [ cDir = MacroDir$ & "\" (@&+?A"6` x^]J^L45 'Array which will be populated with the list of files to be merged `+0K~k|DC Dim fList() As String, curFile As String z<u*I@; GetFileList( cDir, fList ) s5cY> >Xv
Fg Print "" :.bBV]6q Print "Files found for merging:" w1J%%//(h For Each curFile In fList &6q67 Print Chr(9) & curFile 0wnC"2GUX Next P4{!/&/ UsQh+W"? 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. d;FOmo4 Dim nameArray() As String, sampName As String 3 =-XA2zJ nameArray = Split(fList(0)," 0-0.txt") H05xt$J sampName = nameArray(0) VteMsL/H Print "" Lh
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Print "Sample name: " & Chr(9) & sampName mP[Z lS~" GMW,+ 'Open an output file and write the FRED header data # ;3v4P Dim outFile As String *aaK_=w outFile = cDir & sampName & "_FRED.txt" `m+o^!SGe Open outFile For Output As #1
'LW~_\ Print #1, "type bsdf_data" l:- <CbG Print #1, "format angles=deg bsdf=value scale=1" m4~>n( /n-!dXi 'Loop the file list, skip the two header lines and write the remaining data to file +b_o2'' Dim lineArray() As String, curLine As Long _Qd CV` For Each curFile In fList YE;Tpji Print "Merging data from file " & curFile WinwPn+9 ReadFile( cDir & curFile, lineArray ) L)yc_ d5 For curLine = 2 To UBound(lineArray) 7Q>bJ Ek7 Print #1, lineArray(curLine) 26B+qXEt Next !5* Next ]gjB%R[.m 8'|_O 'Close the output file '9XSz? Close #1 ly( LMr Zt/4|&w Print "Finished merging RPC data for sample " & sampName 2`P=ekF] Print "FRED formatted data file: " & Chr(9) & outFile i)=dp!Bx^ End Sub BBDt^$ ESi'3mbeC 'Utility function to read the contents of a file into an array of strings. B:rzM:BQ Function ReadFile(ByVal fileName As String, _ J>N^ FR9 ByRef lineArray() As String) As Long MN<uIqG *iiyU}x ReadFile = -1 K.r
"KxCm| Dim oFSO As Object v\3$$T) Set oFSO = CreateObject("Scripting.FileSystemObject") :F`"CR^, Erase lineArray \#7@"~< G3${\'< Dim fid As Long [oDu3Qn If oFSO.fileexists( fileName ) Then OKV/=]GS fid = FreeFile() MHPh! Open fileName For Input As fid 8Os: SC@Q lineArray = Split(Input(LOF(fid), fid), vbCrLf) Gy6PS{yY6t Close fid t
.-%@,s End If N:~CN1 Set oFSO = Nothing h[i@c`3/2 Return UBound( lineArray ) OOZxs?pR ;i-<dAV8B End Function Gc,6;!+( A Qm!7, Sub GetFileList( ByVal in_dir As String, _ 'Rq2x-72} ByRef in_flist() As String ) N}CeQ'l[R $A^OP{ 'Redimension the file list array i{biQ|,.sL Erase in_flist @&9 ,0x F2!]T = 'Tracks how many files are found s`I]>e Dim fCount As Long RN"Ur'+ fCount = 0 {66P-4Ev( e N^6gub 'Recurse directory and search for text files Uu0 Dim f As String Rj!9pwvT f = Dir$(in_dir & "*.txt") Lq]t6o] While f <> "" )R6-]TkA_ ReDim Preserve in_flist(fCount) CfEACH4_ in_flist(fCount) = f XCj8QM.o fCount += 1 iyTKy+3A f = Dir$() FO{?Z%& ; Wend o]TKL'gW ReDim Preserve in_flist(fCount-1) C Xh>'K Nin7AOO End Sub f,'^"Me$c
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