[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： xV,4U/T  
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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。 @7Rt4}g  
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背景： 5xMA~I0c  
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。 8tV=fSHd  
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。 Pu$kj"|q*[  
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步骤 6`DwEs?Y{  
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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。 $_ix6z  

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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） Ok}{jwJ%W;  
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 '<?v:pb9  
例如下所示： #JL&]Z+X6  
Sample name:  EDF-C1-56 :$M9XZ~\  
Merging data from file EDF-C1-56 0-0.txt 9<t9a f\.>  
Finished merging RPC data for sample EDF-C1-56 vLv|SqD  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt p|h.@do4  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 #.E\,N'  
a. 创建一个新的散射库 ;#Jq$v)D  
b. 散射模型命名 60hNCVq%  
c. 改变散射模型为“Tabulated BSDF”. |TB@@ 2Ky&  
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 ） er["NSo  
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。 :(bdI]  
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， X+dR<GN+YX  
g. 点击OK ]5} -y3  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 _l24Ba$F6  
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脚本代码： nd$H 3sf  
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'#Language "WWB-COM" N{1.gS  
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Option Explicit ~/j$TT"  
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Sub Main .mvB99P{<  
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    'Cleanup J 6(~>g  
    ClearOutputWindow() hH<6E  
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    Print "Merging RPC Photonics BSDF Data Files"
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    SetTextColor(255,0,0) vnz[w=U  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Z"6 2#VM  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." m0=cMVCA!  
    SetTextColor(0,0,0) @T<ad7g-2J  
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    'Current directory of this script (should be the same as the text files being merged) e1^fUOS  
    Dim cDir As String 9U#\nXM  
    cDir = MacroDir$ & "\" %/UV_@x&  
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    'Array which will be populated with the list of files to be merged a$C2}  
    Dim fList() As String, curFile As String 0zg2g!lh  
    GetFileList( cDir, fList ) #d7N| 9_  
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    Print "" lq:]`l,6@  
    Print "Files found for merging:" C:]/8l  
    For Each curFile In fList TRF]i/Bs  
        Print Chr(9) & curFile S:/{  
    Next E)C.eW /  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Oq*n9V  
    Dim nameArray() As String, sampName As String #$LH2?)  
    nameArray = Split(fList(0)," 0-0.txt") ctp?y  
    sampName  = nameArray(0) )D:9R)m  
    Print "" z'7#"D  
    Print "Sample name: " & Chr(9) & sampName n4^~gT%b5]  
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    'Open an output file and write the FRED header data mfZ)^X  
    Dim outFile As String ,%A)"doaG  
    outFile = cDir & sampName & "_FRED.txt" :~
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    Open outFile For Output As #1 ?Fce!J  
    Print #1, "type bsdf_data" X6Un;UL  
    Print #1, "format angles=deg bsdf=value scale=1" uc'p]WhQ  
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    'Loop the file list, skip the two header lines and write the remaining data to file }-d)ms!  
    Dim lineArray() As String, curLine As Long T36x=LX  
    For Each curFile In fList As0 B\  
        Print "Merging data from file " & curFile DeH0k[o  
        ReadFile( cDir & curFile, lineArray ) T_eJ}(p  
        For curLine = 2 To UBound(lineArray) @zo7.'7P  
            Print #1, lineArray(curLine) (@+h5@J[`I  
        Next OFL
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    Next uaiz*Im  
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    'Close the output file /dLA`=rZx  
    Close #1 27m@|M] R  
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    Print "Finished merging RPC data for sample " & sampName (
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    Print "FRED formatted data file: " & Chr(9) & outFile xPt*CB  
End Sub }7.#Dj/r6  
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'Utility function to read the contents of a file into an array of strings. 8q0I:SJy  
Function ReadFile(ByVal fileName As String, _ ?{eY\I  
                  ByRef lineArray() As String) As Long !K[/L< Kv  
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    ReadFile = -1 Rv,82iEKs  
    Dim oFSO As Object kQLT$8io  
    Set oFSO = CreateObject("Scripting.FileSystemObject") $0#6"urG  
    Erase lineArray 7Re-5vz R  
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    Dim fid As Long I FsE!oDs4  
    If oFSO.fileexists( fileName ) Then b vRB  
        fid = FreeFile() \b$<J.3  
        Open fileName For Input As fid -^Xy%  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) .$Y? W<  
        Close fid s O=4IBE  
    End If c_#*mA"+  
    Set oFSO = Nothing I+|uUg5  
    Return UBound( lineArray ) je,c7ZFO  
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End Function 09d9S`cS\  
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Sub GetFileList( ByVal in_dir As String, _ Nt~x&s  
                 ByRef in_flist() As String ) mZ7B<F[qV  
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    'Redimension the file list array L6+C]t}>6  
    Erase in_flist lm$;:Roj*  
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    'Tracks how many files are found 0Gsu  
    Dim fCount As Long "]#'QuR  
    fCount = 0 SNab   
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    'Recurse directory and search for text files =WK04\H  
    Dim f As String |n`PESf_  
    f = Dir$(in_dir & "*.txt") fag
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    While f <> "" (rcMA>2=  
        ReDim Preserve in_flist(fCount) 90fs:.  
        in_flist(fCount) = f Lc]1$  
        fCount += 1 =u=Kw R  
        f = Dir$() J4>;[\%m  
    Wend "Zcu[2,  
    ReDim Preserve in_flist(fCount-1) &yU>2=/T  
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End Sub ^H3m\!h  
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