[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Fs_umy#  
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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。 Ne<"o]_M  
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背景： :Gh* d)
 
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。 aPq9^S*  
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。 ,x?H]a)  
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步骤 nBd!296  
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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。 j[XA"DZR<  
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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） nu] k<^I5|  
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 3,bA&c3  
例如下所示： FX"%  
Sample name:  EDF-C1-56 Z1FO.[FV  
Merging data from file EDF-C1-56 0-0.txt "3{xa;c  
Finished merging RPC data for sample EDF-C1-56 z[DUktZl  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt PXcpROg56  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 eB78z@  
a. 创建一个新的散射库 Wiqy".YY  
b. 散射模型命名 JEX
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c. 改变散射模型为“Tabulated BSDF”. C|Bk'<MI  
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 ） >wjWX{&?  
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。 )^uLZMNaI  
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， F_!6C-z  
g. 点击OK X-! yi  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 0}
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脚本代码： J.:"yK""  
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'#Language "WWB-COM" |2XEt\P  
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Option Explicit
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Sub Main 0k>NuIIP  
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    'Cleanup j3VM!/  
    ClearOutputWindow() _> .TB\  
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    Print "Merging RPC Photonics BSDF Data Files" a J[VX)"J  
    SetTextColor(255,0,0) 4x=rew>Ew  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." sMli!u  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." h[3N/yP  
    SetTextColor(0,0,0) *Xt#04_  
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    'Current directory of this script (should be the same as the text files being merged) AqvRzi(Y  
    Dim cDir As String &by,uVb=|{  
    cDir = MacroDir$ & "\" UuAn`oYhV  
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    'Array which will be populated with the list of files to be merged F8YD:   
    Dim fList() As String, curFile As String
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    GetFileList( cDir, fList ) aZ2liR\QE  
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    Print "" 6}IOUWLB@  
    Print "Files found for merging:" skdSK7 n  
    For Each curFile In fList 2Ua_7  
        Print Chr(9) & curFile q^Lj)zmnK  
    Next GC H= X  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. VZF/2d84&w  
    Dim nameArray() As String, sampName As String Gu~y/CE'  
    nameArray = Split(fList(0)," 0-0.txt") JrseU6N  
    sampName  = nameArray(0) 6-gxba  
    Print "" P /wc9Yt  
    Print "Sample name: " & Chr(9) & sampName eGvHU ;@  
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    'Open an output file and write the FRED header data W<yh{u&,  
    Dim outFile As String ZP*Hx %U  
    outFile = cDir & sampName & "_FRED.txt" tQ'E"u1  
    Open outFile For Output As #1 Pf6rr9  
    Print #1, "type bsdf_data" l},*^Sn<5  
    Print #1, "format angles=deg bsdf=value scale=1" Xgd!i}6Q  
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    'Loop the file list, skip the two header lines and write the remaining data to file tHXt*tzq  
    Dim lineArray() As String, curLine As Long X6!u(plVQ  
    For Each curFile In fList M\,0<{  
        Print "Merging data from file " & curFile y .S0^  
        ReadFile( cDir & curFile, lineArray ) 9fvy)kX;s  
        For curLine = 2 To UBound(lineArray) (p68Qe%OuG  
            Print #1, lineArray(curLine) ,\[&%ph  
        Next 0Apdhwk~  
    Next +f+x3OMX3  
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    'Close the output file `f*
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    Close #1 B!!xu  
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    Print "Finished merging RPC data for sample " & sampName aT(Pf7 O  
    Print "FRED formatted data file: " & Chr(9) & outFile 0fXdE ;M3  
End Sub #; E,>0  
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'Utility function to read the contents of a file into an array of strings. m=PSCIb  
Function ReadFile(ByVal fileName As String, _ <'-}6f3  
                  ByRef lineArray() As String) As Long U[c,cdA  
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    ReadFile = -1 xRP#}i:m  
    Dim oFSO As Object -#Yg B5  
    Set oFSO = CreateObject("Scripting.FileSystemObject") zbx,qctYo$  
    Erase lineArray !a~>;+  
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    Dim fid As Long QT9(s\u  
    If oFSO.fileexists( fileName ) Then ]$4k+)6  
        fid = FreeFile() C:_!zY'z  
        Open fileName For Input As fid n+rAbn5o$  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) b,~4O~z  
        Close fid oA"t`,3  
    End If EfcoJgX  
    Set oFSO = Nothing ZdlZ,vK^.  
    Return UBound( lineArray ) _|wgw^.LJ]  
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End Function OlRBvfoh8  
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Sub GetFileList( ByVal in_dir As String, _ >wdR4!x!?  
                 ByRef in_flist() As String ) @GBS-iT3  
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    'Redimension the file list array 7sC$hm]  
    Erase in_flist [O&2!x  
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    'Tracks how many files are found L<J';#BD  
    Dim fCount As Long 2!-ZNd:(+  
    fCount = 0 c*1t<OAS~  
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    'Recurse directory and search for text files :v* _Ay  
    Dim f As String giyKEnP  
    f = Dir$(in_dir & "*.txt") tcwE.>5O  
    While f <> "" Ua,Lg.z  
        ReDim Preserve in_flist(fCount) {uL<$;#i  
        in_flist(fCount) = f ?<#6=  
        fCount += 1 vy,ER<  
        f = Dir$() Um4 }`  
    Wend $s/N;E!t  
    ReDim Preserve in_flist(fCount-1) C^aP)& qt  
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End Sub Fm`hFBKW  
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