[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： {CVZ7tU7]  
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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。 (R RRG;*n#  
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背景： Dsv2p~  
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。 #,})N*7  
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。 ^r7KEeVD  
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步骤 =i7CF3  
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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。 wXBd"]G)C  
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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） ,MHF  
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 uz=9L<$  
例如下所示： $!z.[GL  
Sample name:  EDF-C1-56 {%,4P_m  
Merging data from file EDF-C1-56 0-0.txt Jiru~
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Finished merging RPC data for sample EDF-C1-56 @KZW*-"  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt >:FmAey  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 N"~P$B1X  
a. 创建一个新的散射库 ^d(gC%+!u  
b. 散射模型命名 Bw[IW[(~!  
c. 改变散射模型为“Tabulated BSDF”. pB%oFWqK  
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 ） j^f54Ky.  
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。 37M,Os1(  
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， !I91kJt7  
g. 点击OK 8Vt'X2  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 RgM=g8}M  
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脚本代码：  5pHv5e  
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'#Language "WWB-COM" g(Oor6Pp  
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Option Explicit ~=otdJ  
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Sub Main X?`mYoe  
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    'Cleanup Z 6][9o  
    ClearOutputWindow() v`6vc)>8  
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    Print "Merging RPC Photonics BSDF Data Files" 2IkyC`  
    SetTextColor(255,0,0) &{q'$oF  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." yaHkWkl =  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." '?X?'_3  
    SetTextColor(0,0,0) 8N<mV^|}  
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    'Current directory of this script (should be the same as the text files being merged) }R
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    Dim cDir As String Sj8fo^K50  
    cDir = MacroDir$ & "\" C 8d9(u  
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    'Array which will be populated with the list of files to be merged d9T:0A`M  
    Dim fList() As String, curFile As String RyWfoLc  
    GetFileList( cDir, fList ) k6\&[BQs  
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    Print "" w2r*$Q  
    Print "Files found for merging:" 3
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    For Each curFile In fList <0jM07\<  
        Print Chr(9) & curFile OO,%zwgt  
    Next |H5$VSw  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 'P%&*%  
    Dim nameArray() As String, sampName As String vrvi] Y8  
    nameArray = Split(fList(0)," 0-0.txt") 0p\Kf(|E*6  
    sampName  = nameArray(0) m YhDi  
    Print "" ?]TtUoY=)F  
    Print "Sample name: " & Chr(9) & sampName p DU+(A4>  
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    'Open an output file and write the FRED header data !!~r1)zN  
    Dim outFile As String hN!{/Gc|  
    outFile = cDir & sampName & "_FRED.txt" WO^]bR  
    Open outFile For Output As #1 J*^ i=y  
    Print #1, "type bsdf_data" P(LiH  
    Print #1, "format angles=deg bsdf=value scale=1" I3}I7oc_  
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    'Loop the file list, skip the two header lines and write the remaining data to file FJW,G20L  
    Dim lineArray() As String, curLine As Long )E6E
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    For Each curFile In fList KHeeB`V>J  
        Print "Merging data from file " & curFile 1ZvXRJ)%  
        ReadFile( cDir & curFile, lineArray ) O}6*9X
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        For curLine = 2 To UBound(lineArray) "!D,9AkZS  
            Print #1, lineArray(curLine) /\E3p6\*  
        Next #X?E#^6?E  
    Next >aCY  
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    'Close the output file -"bC[WN  
    Close #1 jgfr_"@A  
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    Print "Finished merging RPC data for sample " & sampName ^r{N^   
    Print "FRED formatted data file: " & Chr(9) & outFile aZo>3z;
  
End Sub i> {0h3Y  
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'Utility function to read the contents of a file into an array of strings. t^~itlE{  
Function ReadFile(ByVal fileName As String, _ J@ 8OU  
                  ByRef lineArray() As String) As Long R~RE21kAc  
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    ReadFile = -1 uME_/S uO  
    Dim oFSO As Object D28>e  
    Set oFSO = CreateObject("Scripting.FileSystemObject") w@a|_?  
    Erase lineArray xb&,9Lxd|  
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    Dim fid As Long [-R[rF  
    If oFSO.fileexists( fileName ) Then )6px5Vwz  
        fid = FreeFile() ~/2OK!M  
        Open fileName For Input As fid q'uGB fE.  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) !'Hd:oD<  
        Close fid FY/F}C,o  
    End If &Cr4<V6-q  
    Set oFSO = Nothing yFTN/MFt  
    Return UBound( lineArray ) H9WXp&  
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End Function =pnQ?2Og  
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Sub GetFileList( ByVal in_dir As String, _ )C rsm&  
                 ByRef in_flist() As String ) -NA2+].  
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    'Redimension the file list array dl3}\o_
 
    Erase in_flist 8<=sU
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    'Tracks how many files are found \\`(x:\  
    Dim fCount As Long r,P`$-  
    fCount = 0 va0}?fy.O%  
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    'Recurse directory and search for text files 9A9T'g)Du  
    Dim f As String Nc?'},  
    f = Dir$(in_dir & "*.txt") 1*trtb4F  
    While f <> "" 8T"kQB.Zv  
        ReDim Preserve in_flist(fCount) Bz>5OuOVS\  
        in_flist(fCount) = f dKa2_|k'  
        fCount += 1 7'|aEH  
        f = Dir$() F]s:`4  
    Wend x]t$Zb/Uxa  
    ReDim Preserve in_flist(fCount-1) 3k
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End Sub kX+98?h-C