[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Qh8pOUD0l}  
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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。 `x?_yogPM  
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背景： $$p +~X  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 ,if~%'9j  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 r@i)Sluf  
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步骤 c^H#[<6p  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 cCZ$TH  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） EGv]K|  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 qh}+b^Wi  
例如下所示： .i )K#82  
Sample name:  EDF-C1-56 KMfIp:~  
Merging data from file EDF-C1-56 0-0.txt @JdeOL;  
Finished merging RPC data for sample EDF-C1-56 1xkk5\3]  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt m7A3i<6p  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 <x<qO=lq  
a. 创建一个新的散射库 kda*rl~c  
b. 散射模型命名 )~$ejS  
c. 改变散射模型为“Tabulated BSDF”. ]o'dr r  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） hqHk,#  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 1bw$$QXC_  
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， h0 %M+g  
g. 点击OK Oel%lY}m3  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 M`=\ijUwN  
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脚本代码： v'`qn  
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'#Language "WWB-COM"
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Option Explicit Um-Xb'R*]V  
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Sub Main $i3`cX)g  
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    'Cleanup pK>/c>de  
    ClearOutputWindow() gm:Y@6W  
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    Print "Merging RPC Photonics BSDF Data Files" `5x0p a  
    SetTextColor(255,0,0) $K\;sn; |:  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." I&1.}{G>F  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." )g-0b@z!n  
    SetTextColor(0,0,0) E.*wNah"U  
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    'Current directory of this script (should be the same as the text files being merged) *r~6R
  
    Dim cDir As String 7<8'7<X  
    cDir = MacroDir$ & "\" 3-0jxx(  
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    'Array which will be populated with the list of files to be merged b?M. 0{"H  
    Dim fList() As String, curFile As String 7Y4D9pw  
    GetFileList( cDir, fList ) X2np.9hie  
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    Print "" Vd) %qw  
    Print "Files found for merging:" ZWB3R  
    For Each curFile In fList 5ry[Lgg  
        Print Chr(9) & curFile ;'!h(H  
    Next p[!9objU  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. /Vv)00  
    Dim nameArray() As String, sampName As String _$}@hD*R~  
    nameArray = Split(fList(0)," 0-0.txt") PUd/|Rc/}  
    sampName  = nameArray(0) rb>2l3g*  
    Print "" wv%
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    Print "Sample name: " & Chr(9) & sampName i MS4<`  
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    'Open an output file and write the FRED header data "zIQ(|TL?d  
    Dim outFile As String Y\(?&7Aax  
    outFile = cDir & sampName & "_FRED.txt" K_X(j$2Xc  
    Open outFile For Output As #1 UG
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    Print #1, "type bsdf_data" z`dnS]q9  
    Print #1, "format angles=deg bsdf=value scale=1" BSEP*#s  
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    'Loop the file list, skip the two header lines and write the remaining data to file JJ_KfnH  
    Dim lineArray() As String, curLine As Long u<+RA  
    For Each curFile In fList G1,u{d-_  
        Print "Merging data from file " & curFile [Fd[(  
        ReadFile( cDir & curFile, lineArray ) U!lWP#m  
        For curLine = 2 To UBound(lineArray) ,;=is.h9  
            Print #1, lineArray(curLine) 6k1_dRu  
        Next 'HWPuWW  
    Next # o\&G@e}  
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    'Close the output file eoiC.$~\  
    Close #1 o|VM{5  
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    Print "Finished merging RPC data for sample " & sampName 3KKq1][  
    Print "FRED formatted data file: " & Chr(9) & outFile  A1jA$  
End Sub 3"6-X_  
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'Utility function to read the contents of a file into an array of strings. W%#LHluP  
Function ReadFile(ByVal fileName As String, _ ,fs>+]UY3  
                  ByRef lineArray() As String) As Long  !h*F58  
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    ReadFile = -1 q0_Pl*  
    Dim oFSO As Object I9cZZ`vs  
    Set oFSO = CreateObject("Scripting.FileSystemObject") X5P1wxk'  
    Erase lineArray `
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    Dim fid As Long VZU@G)rd  
    If oFSO.fileexists( fileName ) Then {y>Kcfc/?E  
        fid = FreeFile() /gLi(Uw  
        Open fileName For Input As fid p-%m/d?  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) }RkD7  
        Close fid kc"SUiy/  
    End If Ktf lbI!  
    Set oFSO = Nothing G
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    Return UBound( lineArray ) F:2V;  
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End Function R<8!lQ4s  
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Sub GetFileList( ByVal in_dir As String, _ qH*Fv:qnM  
                 ByRef in_flist() As String ) WcE/,<^*  
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    'Redimension the file list array (fnp\j3w  
    Erase in_flist C5'#0}6i  
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    'Tracks how many files are found Y[alOJ  
    Dim fCount As Long @RI\CqFHR  
    fCount = 0 Lc13PTz>>g  
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    'Recurse directory and search for text files B3&`/{u  
    Dim f As String {o.i\"x;  
    f = Dir$(in_dir & "*.txt") Qw/H7fvh&  
    While f <> "" \@:mq]Y  
        ReDim Preserve in_flist(fCount) 7-MkfWH2b6  
        in_flist(fCount) = f s4{>7`N2  
        fCount += 1 o51jw(wO  
        f = Dir$() p EbyQ[  
    Wend ."JtR  
    ReDim Preserve in_flist(fCount-1) 6J%yo[A(w  
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End Sub 0N>R!  
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