[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。 $[z*MQ  
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背景： d29]R.  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 2Ay2 G-  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 q'W`t>2T  
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步骤 f'}23\>  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 G;tIhq[$Vb  
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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） WJ mj|$D  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 ;KnnAZJ  
例如下所示： }F^c*xt[  
Sample name:  EDF-C1-56 `B^?Za,xN  
Merging data from file EDF-C1-56 0-0.txt xOS4J+'s@  
Finished merging RPC data for sample EDF-C1-56 Ex~OT  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt oW-luC+  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 b|4h2iuM  
a. 创建一个新的散射库 NjMo"1d  
b. 散射模型命名 d,$[633It}  
c. 改变散射模型为“Tabulated BSDF”. (=7e~'DC  
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 ） BB~Qs  
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。 /Cwt4.5  
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， >WDb89kC=  
g. 点击OK 9=hA#t.#  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 z<)?8tAgq  
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脚本代码： >YLwWU<X  
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'#Language "WWB-COM" YKj7~yK?  
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Option Explicit |3vQmd !2}  
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Sub Main YsDn?pD@  
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    'Cleanup y|c]r!A  
    ClearOutputWindow() /SZsXaC '  
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    Print "Merging RPC Photonics BSDF Data Files" rjfQ\W;}U  
    SetTextColor(255,0,0) y_\vXY'  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." x"*u98&3  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." E@t^IGDr  
    SetTextColor(0,0,0) -<qci3Ba}  
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    'Current directory of this script (should be the same as the text files being merged) *p+%&z_<  
    Dim cDir As String :h?Zg(l  
    cDir = MacroDir$ & "\" ,p0R4gi  
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    'Array which will be populated with the list of files to be merged .LdLm991,Y  
    Dim fList() As String, curFile As String YQ2ie>C8  
    GetFileList( cDir, fList ) YpXUYNy  
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    Print "" dxxD%lHCF  
    Print "Files found for merging:" lshO'I+)*  
    For Each curFile In fList ^-mz!{  
        Print Chr(9) & curFile  Trm)7B*  
    Next 5,;{<\c  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. mG\,T3/*  
    Dim nameArray() As String, sampName As String ^D"}OQoh  
    nameArray = Split(fList(0)," 0-0.txt") iC$~v#2  
    sampName  = nameArray(0) J?u",a]|H"  
    Print "" Hz!+g'R!Gs  
    Print "Sample name: " & Chr(9) & sampName %<:?{<~wH9  
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    'Open an output file and write the FRED header data NC|&7qQ  
    Dim outFile As String ,??xW{*|  
    outFile = cDir & sampName & "_FRED.txt" {WT"\Xj>B?  
    Open outFile For Output As #1 ]g!k'@  
    Print #1, "type bsdf_data" ^o65sM  
    Print #1, "format angles=deg bsdf=value scale=1" hP,SvN#!2  
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    'Loop the file list, skip the two header lines and write the remaining data to file 2r<UYB  
    Dim lineArray() As String, curLine As Long @\b*a]CV  
    For Each curFile In fList hekAics6S  
        Print "Merging data from file " & curFile _~fO8_vr  
        ReadFile( cDir & curFile, lineArray ) {PWz:\oaD  
        For curLine = 2 To UBound(lineArray) 'R99kL/.N  
            Print #1, lineArray(curLine) !G Z2|~f9  
        Next kfM}j
  
    Next :/K 'P`JaL  
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    'Close the output file &}wKC:LSP  
    Close #1 i=]IUjx<  
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    Print "Finished merging RPC data for sample " & sampName C<eeAWP3v  
    Print "FRED formatted data file: " & Chr(9) & outFile 0q>f x  
End Sub k-Le)8+b  
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'Utility function to read the contents of a file into an array of strings. !634 8nU:  
Function ReadFile(ByVal fileName As String, _ ?20y6c
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                  ByRef lineArray() As String) As Long [p_R?2uT  
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    ReadFile = -1 wwmMpK}f  
    Dim oFSO As Object Y[X5S{H`wj  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 0+m"eGwTm  
    Erase lineArray 9Or3X
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    Dim fid As Long {M$mrmG  
    If oFSO.fileexists( fileName ) Then >/ECLP  
        fid = FreeFile() w[n|Sauy,  
        Open fileName For Input As fid HRC5z<k%  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) +g@@|&B  
        Close fid VABrw t
 
    End If XK{`x<  
    Set oFSO = Nothing !c\s)&U7B  
    Return UBound( lineArray ) KAO}*?  
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End Function j}X4#{jgC  
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Sub GetFileList( ByVal in_dir As String, _ [yf2_{*0T  
                 ByRef in_flist() As String ) _|g(BK2}  
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    'Redimension the file list array \V+$2 :A  
    Erase in_flist 4;7<)&#h  
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    'Tracks how many files are found (uD(,3/Cw  
    Dim fCount As Long -$.$6"]  
    fCount = 0 7"Zr:|$U  
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    'Recurse directory and search for text files 6jO*rseC  
    Dim f As String LGgEq-  
    f = Dir$(in_dir & "*.txt") \@:pWe  
    While f <> "" Z8}Zhe.  
        ReDim Preserve in_flist(fCount) 7?]gUrE  
        in_flist(fCount) = f Mw\/gm_3  
        fCount += 1 m32OE`s  
        f = Dir$() K
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    Wend YL;ZZ2A  
    ReDim Preserve in_flist(fCount-1) }^pnwo9vV  
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End Sub fFqK.^Tn  
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