[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。 T n,Ifo3  
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背景： sEx\7tK  
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。 6X$\:>  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ^!O2Fw  
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步骤 ]`}EOS-Q  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 6|1#Prj  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） aIN?|Ch  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 =gSACDTc  
例如下所示： ?[lKft  
Sample name:  EDF-C1-56 p+{*w7?8"[  
Merging data from file EDF-C1-56 0-0.txt k59.O~0V  
Finished merging RPC data for sample EDF-C1-56 92*Y( >  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt <Q.-WV]Z  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 .r@'9W^8  
a. 创建一个新的散射库 utw@5  
b. 散射模型命名 `]<~lf  
c. 改变散射模型为“Tabulated BSDF”. "C+Fl /v  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） D&8*4>  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 y(Q.uYz*  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， yn{U/+  
g. 点击OK }iR!uhi#  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 d.NB@[?*  
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脚本代码： x0L,$Ol  
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'#Language "WWB-COM" vu)V:y  
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Option Explicit m*TJ@gI*t  
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Sub Main C#.d sl  
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    'Cleanup \"A~ks~  
    ClearOutputWindow() BP@Lhii  
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    Print "Merging RPC Photonics BSDF Data Files" ]F,v#6qi  
    SetTextColor(255,0,0) YZ+<+`Mz<  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." &v_b7h  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." %:.00F([r  
    SetTextColor(0,0,0) TM$`J  
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    'Current directory of this script (should be the same as the text files being merged) 0CUUgwA/  
    Dim cDir As String n!\&X9%[8  
    cDir = MacroDir$ & "\" 9=
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    'Array which will be populated with the list of files to be merged imf_@_  
    Dim fList() As String, curFile As String ;+]GyDgVq  
    GetFileList( cDir, fList ) }U7><I  
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    Print "" .e%B'  
    Print "Files found for merging:" dg42K`E  
    For Each curFile In fList zLLe3?8:  
        Print Chr(9) & curFile 6 {tW$q  
    Next  &+Pcu5  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. kculHIa\.  
    Dim nameArray() As String, sampName As String fmj-&6  
    nameArray = Split(fList(0)," 0-0.txt") ~4+=C\r  
    sampName  = nameArray(0) #N"K4@]{  
    Print "" mEe JK3D[  
    Print "Sample name: " & Chr(9) & sampName ?k*s!YCZ  
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    'Open an output file and write the FRED header data |^E#cI  
    Dim outFile As String A?*_14&  
    outFile = cDir & sampName & "_FRED.txt" i<nUp1r(  
    Open outFile For Output As #1 3?GEXO&,E  
    Print #1, "type bsdf_data" Af>Ho"
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    Print #1, "format angles=deg bsdf=value scale=1" ~;0J4hR  
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    'Loop the file list, skip the two header lines and write the remaining data to file KCkA4`IeM  
    Dim lineArray() As String, curLine As Long `P<m`*  
    For Each curFile In fList u%=M
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        Print "Merging data from file " & curFile zy9# *gGq  
        ReadFile( cDir & curFile, lineArray ) VZ8HnNAbX  
        For curLine = 2 To UBound(lineArray) t`X-jr)g  
            Print #1, lineArray(curLine) } .cP  
        Next YQ}bG{V  
    Next OQON~&~  
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    'Close the output file :kDHwYv$  
    Close #1 [/ E_v gZ  
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    Print "Finished merging RPC data for sample " & sampName uiIY,F
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    Print "FRED formatted data file: " & Chr(9) & outFile agFWye  
End Sub ggUJ -M'2h  
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'Utility function to read the contents of a file into an array of strings. j6KGri  
Function ReadFile(ByVal fileName As String, _ 4W9#z~'  
                  ByRef lineArray() As String) As Long I2=?H<  
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    ReadFile = -1 iVt*N$iZ  
    Dim oFSO As Object +SSF=]4+  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ;$\d^i{N  
    Erase lineArray )MZQ\8,)]  
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    Dim fid As Long FXPw5  
    If oFSO.fileexists( fileName ) Then n^;:V8k  
        fid = FreeFile() Ii,Lj1Q  
        Open fileName For Input As fid b:nHcxDU<  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Y.qlY3iBp  
        Close fid 0'm4 )\  
    End If lk6*?EJ  
    Set oFSO = Nothing HUtuUX  
    Return UBound( lineArray ) }F1|& A  
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End Function ~/6m|k  
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Sub GetFileList( ByVal in_dir As String, _ 4w:_4qyb  
                 ByRef in_flist() As String ) eXI^9u
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    'Redimension the file list array R)"Y40nW  
    Erase in_flist A`4j=OF\  
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    'Tracks how many files are found =3J&UQL  
    Dim fCount As Long O>zM(I+p  
    fCount = 0 *ws!8-)fH  
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    'Recurse directory and search for text files fo$iV;x`  
    Dim f As String Kv[,!P"Y  
    f = Dir$(in_dir & "*.txt") 3 [lF  
    While f <> "" 9qe6hF/29  
        ReDim Preserve in_flist(fCount) ee]PFW28  
        in_flist(fCount) = f k,
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        fCount += 1 >WMH.5p  
        f = Dir$() jZcjiOX  
    Wend ?]081l7cd  
    ReDim Preserve in_flist(fCount-1) *s/sF@8<X  
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End Sub )FM
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