[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Lo!hyQ)  
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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。 2wY|E<E  
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背景： A5yVxSF  
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。 ai sa2#  
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。 {+WY,%e  
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步骤 fF0i^E<  
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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。 _Pqq*  
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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"!$Z/  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 YJ6
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例如下所示： ZgxB7zl//  
Sample name:  EDF-C1-56 49QsT5b)  
Merging data from file EDF-C1-56 0-0.txt ~hvj3zC5xz  
Finished merging RPC data for sample EDF-C1-56 BeVDTk:  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt K/ On|C  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 #!R>`l(S  
a. 创建一个新的散射库 ct3i^,i  
b. 散射模型命名 ~TRC-H  
c. 改变散射模型为“Tabulated BSDF”. !t2
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d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） Yn~fnI{  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 r/!,((Z\  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， "?3=FB
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g. 点击OK UGO;5!  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 d,(y$V+  
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脚本代码： M[mYG _{J  
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'#Language "WWB-COM" OX;(Mg|  
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Option Explicit NlEyT9  
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Sub Main -iDs:J4Iq  
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    'Cleanup ~][~aEat;V  
    ClearOutputWindow() A?lLK&*  
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    Print "Merging RPC Photonics BSDF Data Files" DA "V)  
    SetTextColor(255,0,0) `Ow]@flLI  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." vTK%8qoZ  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 6m;>R%S_  
    SetTextColor(0,0,0) VxN#\Di&  
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    'Current directory of this script (should be the same as the text files being merged) Z5q%L!4G  
    Dim cDir As String l[T
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    cDir = MacroDir$ & "\" E'f7=
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    'Array which will be populated with the list of files to be merged @GKDSS4jv  
    Dim fList() As String, curFile As String pWRdI_  
    GetFileList( cDir, fList ) }+KM"+@$<  
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    Print "" W/2y;@  
    Print "Files found for merging:" aH6j,R%  
    For Each curFile In fList cj2Smgw&>  
        Print Chr(9) & curFile ED>7  
    Next ?_g
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. bPFGQlmIO  
    Dim nameArray() As String, sampName As String NRx 7S9W  
    nameArray = Split(fList(0)," 0-0.txt") yf:0u_&]  
    sampName  = nameArray(0) ejV`W7U  
    Print "" i`sZP#h  
    Print "Sample name: " & Chr(9) & sampName o
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    'Open an output file and write the FRED header data N9/k`ZGC  
    Dim outFile As String %6cr4}Zm}  
    outFile = cDir & sampName & "_FRED.txt" jo"nK,r  
    Open outFile For Output As #1 l\{Qnb(  
    Print #1, "type bsdf_data" F\JS?zt2  
    Print #1, "format angles=deg bsdf=value scale=1" .@&FJYkLYi  
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    'Loop the file list, skip the two header lines and write the remaining data to file w@-G_-6W  
    Dim lineArray() As String, curLine As Long y05!-G:Y\  
    For Each curFile In fList i<Ms2^  
        Print "Merging data from file " & curFile r!!uA1!7  
        ReadFile( cDir & curFile, lineArray ) IMD^(k 2  
        For curLine = 2 To UBound(lineArray) 6h/!,j0:t_  
            Print #1, lineArray(curLine) D/=05E%[81  
        Next P[
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    Next ti+e U$  
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    'Close the output file Nt8"6k_  
    Close #1 =r/K#hOR\J  
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    Print "Finished merging RPC data for sample " & sampName ia\Gmh  
    Print "FRED formatted data file: " & Chr(9) & outFile X40gJV<  
End Sub |gA@$1+}  
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'Utility function to read the contents of a file into an array of strings. zKP[]S-  
Function ReadFile(ByVal fileName As String, _ TE&E f$h  
                  ByRef lineArray() As String) As Long 9mvy+XD  
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    ReadFile = -1 ;0WAfu}#H  
    Dim oFSO As Object "-S!^h/v  
    Set oFSO = CreateObject("Scripting.FileSystemObject") "#wAGlH6>  
    Erase lineArray Ut~YvWc9  
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    Dim fid As Long ^kNVQJiZyG  
    If oFSO.fileexists( fileName ) Then x%X3FbF]  
        fid = FreeFile() LF.i0^#J
 
        Open fileName For Input As fid A(&\wd  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) G--vwvL  
        Close fid %rs2{Q2k  
    End If > U3>I^Y  
    Set oFSO = Nothing Lb$Uba-_  
    Return UBound( lineArray ) s8(Z&pQ  
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End Function MDa[bQNM  
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Sub GetFileList( ByVal in_dir As String, _ P:6K  
                 ByRef in_flist() As String ) %tkqWK:  
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    'Redimension the file list array _RcEfT  
    Erase in_flist =X'EDw  
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    'Tracks how many files are found iU.` TqR7  
    Dim fCount As Long LGy62 y$  
    fCount = 0 ~C 3Y/}  
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    'Recurse directory and search for text files ';.TQ_I7Y  
    Dim f As String VKXi*F9  
    f = Dir$(in_dir & "*.txt") @I Y<i5(  
    While f <> "" :Dr4?6hdr  
        ReDim Preserve in_flist(fCount) ,%m~OB#  
        in_flist(fCount) = f t`&mszd~T  
        fCount += 1 )+G0m,n  
        f = Dir$() uF%N`e^S  
    Wend Q>yj<DR  
    ReDim Preserve in_flist(fCount-1) uR")@Tc  
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End Sub L9hL@  
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