[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： |1X^@  
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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。 ~ z*  
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背景： {^>m3  
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。 A;m)/@  
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。 )Xg,;^  
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步骤 S:/;|D
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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。 KG6ki_  
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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） \ F#mwl,>"  
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 >w+WG0Z K  
例如下所示： 'm}K$h(U  
Sample name:  EDF-C1-56 ^-cj=on=Q  
Merging data from file EDF-C1-56 0-0.txt \NKf$"x}  
Finished merging RPC data for sample EDF-C1-56 5 :6^533]  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt R8P7JY[h  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 9V`/zq?  
a. 创建一个新的散射库 "{105&c\  
b. 散射模型命名 wX@&Qv  
c. 改变散射模型为“Tabulated BSDF”. D oX!P|*  
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 ） p;`jmF   
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。 q]YPDdR#  
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， N~_GJw@  
g. 点击OK !}|n3wQ  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 `Gzuk
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脚本代码： oh:q:St  
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'#Language "WWB-COM" &1Y

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Option Explicit $cEl6(66iX  
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Sub Main Rnt&<|8G  
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    'Cleanup Wk"4mq  
    ClearOutputWindow() IlG)=?8XZ  
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    Print "Merging RPC Photonics BSDF Data Files" }GJIM|7^  
    SetTextColor(255,0,0) Ls)y.u  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." b|U&{I>TH  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." )$Xd#bzD|  
    SetTextColor(0,0,0) jnsV'@v8Nj  
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    'Current directory of this script (should be the same as the text files being merged) ]\w0u7}  
    Dim cDir As String _" W<>  
    cDir = MacroDir$ & "\" e^Q$Tog<  
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    'Array which will be populated with the list of files to be merged r,X5@/  
    Dim fList() As String, curFile As String tp<uN~rTgh  
    GetFileList( cDir, fList ) #\KSv Z  
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    Print "" BlUl5mP}>  
    Print "Files found for merging:" ps=jGh[  
    For Each curFile In fList Og[NRd+  
        Print Chr(9) & curFile {2G9>'  
    Next Jaz|b`KDj  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ,}2yxo;i  
    Dim nameArray() As String, sampName As String eWzD'3h^  
    nameArray = Split(fList(0)," 0-0.txt") Nq6~6Rr  
    sampName  = nameArray(0) lMz5))Rr  
    Print "" i*B@
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    Print "Sample name: " & Chr(9) & sampName RpPbjz~  
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    'Open an output file and write the FRED header data BV,P;T0"D  
    Dim outFile As String \PU3{_G]  
    outFile = cDir & sampName & "_FRED.txt" rStfluPL  
    Open outFile For Output As #1 0yr=$F(]s  
    Print #1, "type bsdf_data" o:B?gDM  
    Print #1, "format angles=deg bsdf=value scale=1" gXN#<g,:^  
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    'Loop the file list, skip the two header lines and write the remaining data to file $~vy,^  
    Dim lineArray() As String, curLine As Long 7_C;-  
    For Each curFile In fList c=]qUhnH  
        Print "Merging data from file " & curFile uqwB`<>KJ  
        ReadFile( cDir & curFile, lineArray ) ',j'Hf  
        For curLine = 2 To UBound(lineArray) =<w6yeko  
            Print #1, lineArray(curLine) $s<,xY 9  
        Next ;ZZ%(P=-  
    Next <ABN/nH  
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    'Close the output file Jv1igA21_h  
    Close #1 ''Fy]CwH(  
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    Print "Finished merging RPC data for sample " & sampName cnr&%-  
    Print "FRED formatted data file: " & Chr(9) & outFile TJFxo? gC"  
End Sub HL$}Gh]q  
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'Utility function to read the contents of a file into an array of strings. 4q#6.E;yy  
Function ReadFile(ByVal fileName As String, _ f"t\-ux.b  
                  ByRef lineArray() As String) As Long 1];rW`Bw  
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    ReadFile = -1 9t@^P^}=\m  
    Dim oFSO As Object 7NC"}JB&  
    Set oFSO = CreateObject("Scripting.FileSystemObject") }@MOkj  
    Erase lineArray 92_F8y*D  
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    Dim fid As Long :q=u+h_  
    If oFSO.fileexists( fileName ) Then (\m4o   
        fid = FreeFile() [.4R ,[U  
        Open fileName For Input As fid 4DI.RK9  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) eq.K77El{J  
        Close fid N^7Qn*qt[  
    End If bOjvrg;Sz\  
    Set oFSO = Nothing UMR0S5`}  
    Return UBound( lineArray ) H&jK|]UXoO  
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End Function +7n;Bsk _  
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Sub GetFileList( ByVal in_dir As String, _ lJ.:5$2H  
                 ByRef in_flist() As String ) s\ft:a@  
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    'Redimension the file list array "jBrPCB 8  
    Erase in_flist 4cJ7W_ >i6  
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    'Tracks how many files are found -1).'aJ^  
    Dim fCount As Long y<mmv~=  
    fCount = 0 }~pT saw  
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    'Recurse directory and search for text files ~]f+  
    Dim f As String kKr|PFz  
    f = Dir$(in_dir & "*.txt") qN((Xz+AZE  
    While f <> "" 3wZA,Z  
        ReDim Preserve in_flist(fCount) {~NiGHY  
        in_flist(fCount) = f S@i*+&Ot  
        fCount += 1 oC0K!{R*  
        f = Dir$() L,#ij!txS  
    Wend 0'y9HE'e  
    ReDim Preserve in_flist(fCount-1) 2w)[1s[  
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End Sub c{4C4'GD  
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