[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： \eN}V  
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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。 a}6Wo
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背景： .^/OL}/~<  
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。 <|v]
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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。 &TKB8vx=#  
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步骤 dD=dPi#
 
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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。 J5429Soo  
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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） .Ir
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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 >XBLm`a  
例如下所示： t'^/}=c-  
Sample name:  EDF-C1-56 !iMsTH<  
Merging data from file EDF-C1-56 0-0.txt y:xZ(RgfF  
Finished merging RPC data for sample EDF-C1-56 `U)~fu/\2M  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt cO' \s  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 <~'\~Zd+  
a. 创建一个新的散射库 yKi* 8N"e<  
b. 散射模型命名 A%pcPzG;  
c. 改变散射模型为“Tabulated BSDF”. _Y=>^K]9K  
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 ） O.}{s;  
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。 (Ori].{C.J  
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， G>"w$Us  
g. 点击OK 4\>Cnc{  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 :dK/}S0  
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脚本代码： PC/Oo~Gx  
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'#Language "WWB-COM" sT|8a  
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Option Explicit u[})|x*N  
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Sub Main &;|/I`+  
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    'Cleanup J&wrBVv1uk  
    ClearOutputWindow() iCnKQG  
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    Print "Merging RPC Photonics BSDF Data Files" ?(H/a-(:v}  
    SetTextColor(255,0,0) QYPsqkF*  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." x8w455  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." eVS6#R]'m  
    SetTextColor(0,0,0) h,45-#+  
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    'Current directory of this script (should be the same as the text files being merged) oIN!3  
    Dim cDir As String b 'jZ4{+W  
    cDir = MacroDir$ & "\" ZG3u  
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    'Array which will be populated with the list of files to be merged h@&&.S`B  
    Dim fList() As String, curFile As String x[zt(kC0+  
    GetFileList( cDir, fList ) ,E<(K8  
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    Print "" [2:Q.Zj  
    Print "Files found for merging:" vvwNJyU-  
    For Each curFile In fList qS:hv&~  
        Print Chr(9) & curFile E0[ec6^qwY  
    Next yHsmX2s  

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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. gs7h`5[es  
    Dim nameArray() As String, sampName As String ~dg7c{o5  
    nameArray = Split(fList(0)," 0-0.txt") Cz` !j  
    sampName  = nameArray(0) Bvb.N$G  
    Print "" @m[q0G}  
    Print "Sample name: " & Chr(9) & sampName BIqZg$  
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    'Open an output file and write the FRED header data ;EDc1:  
    Dim outFile As String %ukFn &-2@  
    outFile = cDir & sampName & "_FRED.txt" pUi|&F K">  
    Open outFile For Output As #1 CY"&@v1  
    Print #1, "type bsdf_data" j51Wod<[  
    Print #1, "format angles=deg bsdf=value scale=1" 0]p! Bscaf  
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    'Loop the file list, skip the two header lines and write the remaining data to file hH_&42E6  
    Dim lineArray() As String, curLine As Long =:Ahg 9  
    For Each curFile In fList 6aRPm%  
        Print "Merging data from file " & curFile TrD2:N}dI  
        ReadFile( cDir & curFile, lineArray ) [$:M/5y9  
        For curLine = 2 To UBound(lineArray) 5n{J}0C  
            Print #1, lineArray(curLine) B)>r~v]  
        Next 8`~M$5!  
    Next R9bsl.e  
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    'Close the output file )IQ5Qu  
    Close #1 rKxIOJ,T  
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    Print "Finished merging RPC data for sample " & sampName wiHGTaR  
    Print "FRED formatted data file: " & Chr(9) & outFile vMG>Xb  
End Sub ts|dk%  
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'Utility function to read the contents of a file into an array of strings. a_}k^zw(  
Function ReadFile(ByVal fileName As String, _ b/;!yOF  
                  ByRef lineArray() As String) As Long ,6TF]6:  
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    ReadFile = -1 gJ;jh7e@  
    Dim oFSO As Object WRIOjQ:  
    Set oFSO = CreateObject("Scripting.FileSystemObject") P5;n(E(19  
    Erase lineArray vfBIQfH  
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    Dim fid As Long !'m MGxkEb  
    If oFSO.fileexists( fileName ) Then 9NzK1V0X  
        fid = FreeFile() ' b?' u  
        Open fileName For Input As fid DNTkv_S  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) p>x[:*  
        Close fid gbf2ty  
    End If cl2+,!:  
    Set oFSO = Nothing QEtf-xNn^  
    Return UBound( lineArray ) -o: ifF|  
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End Function Hg[g{A_G[  
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Sub GetFileList( ByVal in_dir As String, _ %PF:OB6[|  
                 ByRef in_flist() As String ) ''.P=  
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    'Redimension the file list array M( euwy  
    Erase in_flist H|UGR~&  
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    'Tracks how many files are found 3jeB\  
    Dim fCount As Long &>%R)?SZh  
    fCount = 0 MawWgd*  
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    'Recurse directory and search for text files Wb
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    Dim f As String [l`_2{:
 
    f = Dir$(in_dir & "*.txt") @$:T]N3m  
    While f <> "" 6(M^`&fl
 
        ReDim Preserve in_flist(fCount) 8VWkUsOoI  
        in_flist(fCount) = f WRdBL5  
        fCount += 1 yiT)m]E d  
        f = Dir$() 40?xu#"  
    Wend -=;V*;  
    ReDim Preserve in_flist(fCount-1) 85{2TXQ^%=  
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End Sub U<|hIv-&  
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