[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。 6u'+#nm  
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背景： +frkC| .  
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。 Y5Ub[o  
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。 9~En;e  
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步骤 E`DsRR <  
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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。 S5W*,?  
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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） )G a%Eg9  
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 "|\G[xLOaW  
例如下所示： /tu+L6  
Sample name:  EDF-C1-56 me7?  
Merging data from file EDF-C1-56 0-0.txt %DKQ  
Finished merging RPC data for sample EDF-C1-56 +].Zs<  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt _"Bh 3 7  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 =xa:>Vh#  
a. 创建一个新的散射库 w,<nH:~  
b. 散射模型命名 + \DGS  
c. 改变散射模型为“Tabulated BSDF”. "8'aZ.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 ） }qa8
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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。 4}4K6y<q  
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， 2}ttCm  
g. 点击OK xw)$).yc  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 5$(qnOi  
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脚本代码： 4t%g:9]vr  
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'#Language "WWB-COM" zJ*|tw4  
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Option Explicit y(#Aze{yC  
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Sub Main x/UmpJD+  
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    'Cleanup :#?Z)oQpT  
    ClearOutputWindow() VdVUYp  
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    Print "Merging RPC Photonics BSDF Data Files" .5i\L OTd  
    SetTextColor(255,0,0) dK5|tWJX  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." D9cpw0{nc  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 2=&4@c|cn  
    SetTextColor(0,0,0) wNHvYulI  
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    'Current directory of this script (should be the same as the text files being merged) aCq ) hR  
    Dim cDir As String
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    cDir = MacroDir$ & "\" rW.o_z03^  
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    'Array which will be populated with the list of files to be merged N3_rqRd^  
    Dim fList() As String, curFile As String *gq~~(jH  
    GetFileList( cDir, fList ) 'Mfn:n+  
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    Print "" 3X0"</G6  
    Print "Files found for merging:" <6 LpsM}  
    For Each curFile In fList 1Q&\y)@bT  
        Print Chr(9) & curFile \c"{V-#o\  
    Next mHm"QBa!  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. yX^/Oc@j  
    Dim nameArray() As String, sampName As String b6@(UneVM  
    nameArray = Split(fList(0)," 0-0.txt") W[+=_B  
    sampName  = nameArray(0) 8f\sG:$  
    Print "" #s4v0auK  
    Print "Sample name: " & Chr(9) & sampName 9`A}-YA!  
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    'Open an output file and write the FRED header data n<}t\<LG^c  
    Dim outFile As String W^e
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    outFile = cDir & sampName & "_FRED.txt" VZ#@7t  
    Open outFile For Output As #1 ,)S(SnCF  
    Print #1, "type bsdf_data" +"u6+[E  
    Print #1, "format angles=deg bsdf=value scale=1" ?89K [D|  
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    'Loop the file list, skip the two header lines and write the remaining data to file NrHh(:  
    Dim lineArray() As String, curLine As Long t_VF=B^LuR  
    For Each curFile In fList N"tEXb/,
 
        Print "Merging data from file " & curFile lg9
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        ReadFile( cDir & curFile, lineArray ) =i`#0i2(  
        For curLine = 2 To UBound(lineArray) \:'|4D]'I  
            Print #1, lineArray(curLine) )I
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        Next 4Ou|4WjnL  
    Next Z=L~W,0'  
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    'Close the output file D2060ze  
    Close #1 >~nc7j u  
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    Print "Finished merging RPC data for sample " & sampName I6q]bQ="  
    Print "FRED formatted data file: " & Chr(9) & outFile ,%bG]5  
End Sub /2<1/[#  
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'Utility function to read the contents of a file into an array of strings. Vb _W&Nwd  
Function ReadFile(ByVal fileName As String, _ #o(c=  
                  ByRef lineArray() As String) As Long ^lt;K{  

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    ReadFile = -1 62}rZVJq  
    Dim oFSO As Object 3I" <\M4x  
    Set oFSO = CreateObject("Scripting.FileSystemObject") l2AAEB_C.  
    Erase lineArray e>OYJd0s  
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    Dim fid As Long 2I8RO\zR  
    If oFSO.fileexists( fileName ) Then &!adW@y  
        fid = FreeFile() 0~)_/yx?S  
        Open fileName For Input As fid 3U_,4qf  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) e5"?ol0  
        Close fid jkN-(v(T  
    End If /+11`B0
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    Set oFSO = Nothing AP2BND9  
    Return UBound( lineArray ) )|Ho"VEmg  
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End Function SWrt4G  
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Sub GetFileList( ByVal in_dir As String, _ #S*@RKSE|7  
                 ByRef in_flist() As String ) 4X()D {uR  
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    'Redimension the file list array 0cpI2  
    Erase in_flist EYsf<8cl  
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    'Tracks how many files are found `:4\RcTb/  
    Dim fCount As Long ?>\JX  
    fCount = 0 "F$0NYb]I  

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    'Recurse directory and search for text files No'^]r  
    Dim f As String a2z1/Nh  
    f = Dir$(in_dir & "*.txt") 09r0Rb  
    While f <> "" P+hp'YK1  
        ReDim Preserve in_flist(fCount) ;'|Mt)\  
        in_flist(fCount) = f bR0z$~  
        fCount += 1 qMA K"%x  
        f = Dir$() }gfs  
    Wend B <CK~ybY  
    ReDim Preserve in_flist(fCount-1) ]Zj6W9]m  
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End Sub z.xOT;t  
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