[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： <(#(hDwy  
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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。 #Bze
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背景： e v}S+!|U  
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。 Q)#B0NA;T  
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。 kb%;=t2  
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步骤 W<{h,j8  
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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。 xa'*P=<)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） %X]jaX7  
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 ]2A^1Del  
例如下所示： B^=-Z8  
Sample name:  EDF-C1-56 ejKucEgD  
Merging data from file EDF-C1-56 0-0.txt _`$qBw.Nx  
Finished merging RPC data for sample EDF-C1-56 cdH>n)  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @3i\%R)n;  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 j8i[ONq^  
a. 创建一个新的散射库 t|?ez4/{z  
b. 散射模型命名 W ~<^L\Lu  
c. 改变散射模型为“Tabulated BSDF”. HdI8f!X'TG  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） krxo"WgD  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 sfH_5 #w  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， W.jGGt\<\  
g. 点击OK \
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 &<g|gsG`  
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脚本代码： `cn#B BV  
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'#Language "WWB-COM" nUr5Qn?  
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Option Explicit 1.JK33  
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Sub Main  'c&Ed  
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    'Cleanup %QH$ipM  
    ClearOutputWindow() .<?GS{6 N  
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    Print "Merging RPC Photonics BSDF Data Files" iozt&~o  
    SetTextColor(255,0,0) Rh2+=N<X  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ]]![EHi(\  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." g'f@H-KCD  
    SetTextColor(0,0,0) @u+]aI!`-  
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    'Current directory of this script (should be the same as the text files being merged) pQ">UL*  
    Dim cDir As String ]#<4vl\  
    cDir = MacroDir$ & "\" +QavYqPF  
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    'Array which will be populated with the list of files to be merged ?,Xw[pR  
    Dim fList() As String, curFile As String FkDmP`Od  
    GetFileList( cDir, fList ) }Bh8=F3O Q  
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    Print "" m@j?za9s  
    Print "Files found for merging:" "^[ 'y7i  
    For Each curFile In fList q_
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        Print Chr(9) & curFile ;+
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    Next !TH) +zi  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. u#fM_>ML  
    Dim nameArray() As String, sampName As String c]-<vkpV  
    nameArray = Split(fList(0)," 0-0.txt") 6v!`1} ~  
    sampName  = nameArray(0) /HE
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    Print "" UgRiIQMq.  
    Print "Sample name: " & Chr(9) & sampName <nf@U>wlw  
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    'Open an output file and write the FRED header data ~Cttzn]pR  
    Dim outFile As String *R,5h2;  
    outFile = cDir & sampName & "_FRED.txt" +E+p"7  
    Open outFile For Output As #1 C&f= ywi0  
    Print #1, "type bsdf_data" }K>d+6qk5  
    Print #1, "format angles=deg bsdf=value scale=1" %0?
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    'Loop the file list, skip the two header lines and write the remaining data to file i"FtcP^  
    Dim lineArray() As String, curLine As Long K3m/(jdO  
    For Each curFile In fList aKDKmHd  
        Print "Merging data from file " & curFile B@))8.h]  
        ReadFile( cDir & curFile, lineArray ) Po0A#Zl  
        For curLine = 2 To UBound(lineArray) R^fPIv`q  
            Print #1, lineArray(curLine) v~C Czg  
        Next cZ*@$%_  
    Next 3
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    'Close the output file (E3b\lST  
    Close #1 !F-w3 ]  
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    Print "Finished merging RPC data for sample " & sampName D)P._?  
    Print "FRED formatted data file: " & Chr(9) & outFile # w4-aJ  
End Sub >|=ts  
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'Utility function to read the contents of a file into an array of strings. MchA{p&Ol  
Function ReadFile(ByVal fileName As String, _ YP<ms  
                  ByRef lineArray() As String) As Long BOX2O.Pm  
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    ReadFile = -1 e%M;?0j  
    Dim oFSO As Object
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    Set oFSO = CreateObject("Scripting.FileSystemObject") ,qwuLBW  
    Erase lineArray R\f+SvE  
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    Dim fid As Long j;r-NCBnz  
    If oFSO.fileexists( fileName ) Then >R_&Ouh:  
        fid = FreeFile() ^7*11%Q  
        Open fileName For Input As fid Y@iS_lR  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) XT*sGM  
        Close fid Tidn-2L73O  
    End If pki%vRY  
    Set oFSO = Nothing c6]U E@A  
    Return UBound( lineArray ) ^76]0`gS  
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End Function V0YZp  
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Sub GetFileList( ByVal in_dir As String, _ OT*mO&Z  
                 ByRef in_flist() As String ) J;e2&gB  
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    'Redimension the file list array UkC!1Jy  
    Erase in_flist $PPi5f}HD  

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    'Tracks how many files are found l)\! .X  
    Dim fCount As Long 00y!K m_D  
    fCount = 0 ,0
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    'Recurse directory and search for text files ^ @5QP$.  
    Dim f As String _VN?#J)o  
    f = Dir$(in_dir & "*.txt") gf@:R'$:+  
    While f <> "" &z3o7rif$  
        ReDim Preserve in_flist(fCount) "S]TP$O D  
        in_flist(fCount) = f Llo"MO*sr  
        fCount += 1 F>l] 9!P|m  
        f = Dir$() BU_nh+dF  
    Wend d0ksG$  
    ReDim Preserve in_flist(fCount-1) 59A}}.@?m  
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End Sub p2](_}PK