[分享]RPC Photonics扩散片BSDF [复制链接]

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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。 BvXA9YQ3  
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背景： };rxpw>ms  
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。 p i;,?p-  
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。 Z/y&;N4   
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步骤 ?*2DR:o>@  
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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。 Gp0B^^H$  
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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） ^jY'Hj.Bs  
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 ck=x_HB1  
例如下所示： 4#pn]  
Sample name:  EDF-C1-56 z#$>f*b  
Merging data from file EDF-C1-56 0-0.txt %Tc P[<  
Finished merging RPC data for sample EDF-C1-56 B%~hVpm,eM  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt `s0`kp  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 pN-l82]'  
a. 创建一个新的散射库 3ID1>  
b. 散射模型命名 (?9@nS  
c. 改变散射模型为“Tabulated BSDF”. d&!;uzOx  
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 ） br
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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。 a>3#z2#  
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， 0|1)cO}Dy  
g. 点击OK NJ^H"FLS:  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 -r.Qy(}p  
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脚本代码：
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'#Language "WWB-COM" *bi!iz5F  
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Option Explicit 9n(.v}  
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Sub Main $#b@b[h<w  
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    'Cleanup 7P&O{tl(  
    ClearOutputWindow() X?2ub/Nr#Y  
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    Print "Merging RPC Photonics BSDF Data Files" ,YEwz3$5u  
    SetTextColor(255,0,0) 5_|Sm=  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." scXY~l]I*  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 2J>v4EWC  
    SetTextColor(0,0,0) )D_\~n/5  
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    'Current directory of this script (should be the same as the text files being merged) td}%reH  
    Dim cDir As String _LVi}mM  
    cDir = MacroDir$ & "\" ,Pq@{i#  
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    'Array which will be populated with the list of files to be merged 5,i0QT"  
    Dim fList() As String, curFile As String IB'gY0*  
    GetFileList( cDir, fList ) E41ay:duAl  
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    Print "" l\Q--

 
    Print "Files found for merging:" vr:5+wew  
    For Each curFile In fList )z:"P;b"Nl  
        Print Chr(9) & curFile vtm?x,h  
    Next R#K,/b%SV  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. oqXs2F  
    Dim nameArray() As String, sampName As String >Y3ZK{b  
    nameArray = Split(fList(0)," 0-0.txt") JemB[  
    sampName  = nameArray(0) I1J/de,u  
    Print "" M5C%(sQ$  
    Print "Sample name: " & Chr(9) & sampName 53g(:
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    'Open an output file and write the FRED header data EG7.FjnVu  
    Dim outFile As String @(b;H0r~  
    outFile = cDir & sampName & "_FRED.txt" acPX2B[jJ  
    Open outFile For Output As #1 AA&5wDMV>  
    Print #1, "type bsdf_data" ?y1G,0,  
    Print #1, "format angles=deg bsdf=value scale=1" T@{}!  
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    'Loop the file list, skip the two header lines and write the remaining data to file c9uln  
    Dim lineArray() As String, curLine As Long B%L dH  
    For Each curFile In fList (8XP7c]5  
        Print "Merging data from file " & curFile eHIsTL@Fp  
        ReadFile( cDir & curFile, lineArray ) gq:2`W&5  
        For curLine = 2 To UBound(lineArray) ^U5g7Emf  
            Print #1, lineArray(curLine) ?'jRUfl   
        Next Xy[*)<  
    Next [f8mh88r  
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    'Close the output file Qf$3!O}G  
    Close #1  f^vz  
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    Print "Finished merging RPC data for sample " & sampName &_Vd  
    Print "FRED formatted data file: " & Chr(9) & outFile Ok*aP+Wq  
End Sub u A=x~-I  
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'Utility function to read the contents of a file into an array of strings. ;oT!\$Mu  
Function ReadFile(ByVal fileName As String, _ 5 `Mos  
                  ByRef lineArray() As String) As Long MODi:jsl  
}
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    ReadFile = -1 an<loLW  
    Dim oFSO As Object F?3zw4Vt~  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Ln3<r&&Jz  
    Erase lineArray sf(2~BMQI  
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    Dim fid As Long 2Jl
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    If oFSO.fileexists( fileName ) Then IT5a/;J  
        fid = FreeFile() !^h{7NmP[  
        Open fileName For Input As fid k04CSzE"%  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) @/yQ4Gr  
        Close fid o;^k"bo6  
    End If :jP4GCxU|  
    Set oFSO = Nothing 920 o]Dh=t  
    Return UBound( lineArray ) 'xn3g;5  
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End Function ky^u.+cZ  
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Sub GetFileList( ByVal in_dir As String, _ /bBFPrW  
                 ByRef in_flist() As String ) D(YNa  
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    'Redimension the file list array e ab_"W   
    Erase in_flist aplOo[  
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    'Tracks how many files are found ~4t7Q  
    Dim fCount As Long Rv^ \o  
    fCount = 0 #1#?k  
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    'Recurse directory and search for text files 6.>l  
    Dim f As String -$0w-M8'  
    f = Dir$(in_dir & "*.txt") _(&XqEX  
    While f <> "" OqW (C  
        ReDim Preserve in_flist(fCount) /OaW4 b$Tz  
        in_flist(fCount) = f "A0J~YvYWJ  
        fCount += 1 qEW3k),  
        f = Dir$() )8244;  
    Wend 7z@Jw  
    ReDim Preserve in_flist(fCount-1) x[w!buV0\  
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End Sub ~UhTy~jya  
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