[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： =1kjKE !  
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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。 RA62Z&W3  
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背景： *!(?=9[  
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。 T|nN.  
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。 |B*`%7{+  
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步骤 _nnl+S>K  
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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。 Eh;~y*k\  
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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） d3C*]|gQ  
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 o;:a6D`   
例如下所示： Ie;}k;?-  
Sample name:  EDF-C1-56 KK*"s^L  
Merging data from file EDF-C1-56 0-0.txt *SZ*S%oS3  
Finished merging RPC data for sample EDF-C1-56 l:kF0tj"  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt sXSZ#@u,WN  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 RT2a:3f  
a. 创建一个新的散射库 ?G-a:'1!6  
b. 散射模型命名 hMx/}Tw wt  
c. 改变散射模型为“Tabulated BSDF”. xH8nn3U  
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 ） *o[*,1Pw  
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。 K`1\3J)  
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， yyHr. C  
g. 点击OK ffyKAZ{]po  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 (iiyptJ  
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脚本代码： !$+J7\&7p  
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'#Language "WWB-COM" {/ _.]Vh  
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Option Explicit V9m1n=r  
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Sub Main A|@d4+  
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    'Cleanup .,x08M  
    ClearOutputWindow() nyPA
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    Print "Merging RPC Photonics BSDF Data Files" *$_<| g)9  
    SetTextColor(255,0,0) G";yqG  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." EY!aiH6P  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." GL1!Z3  
    SetTextColor(0,0,0) n/UyMO3=  
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    'Current directory of this script (should be the same as the text files being merged) Fk 1M5Dm  
    Dim cDir As String *-Y
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    cDir = MacroDir$ & "\" 4oOe  
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    'Array which will be populated with the list of files to be merged (F7!&]8%  
    Dim fList() As String, curFile As String :/Nz' n  
    GetFileList( cDir, fList ) J]|-.Wv1  
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    Print "" 82Vxk  
    Print "Files found for merging:" Ybx4 Up@  
    For Each curFile In fList _&JlE$ua7  
        Print Chr(9) & curFile ^QV;[ha,o  
    Next ^yu^Du  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. jvm "7)h  
    Dim nameArray() As String, sampName As String 4(YKwY2_L  
    nameArray = Split(fList(0)," 0-0.txt") OY`G_=6!N  
    sampName  = nameArray(0) !cE)LG  
    Print "" ({zp$P}  
    Print "Sample name: " & Chr(9) & sampName 'J<KL#og  
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    'Open an output file and write the FRED header data "Rs^0iT7>  
    Dim outFile As String M* QqiE  
    outFile = cDir & sampName & "_FRED.txt" Khw!+!(H  
    Open outFile For Output As #1 Ctt{j'-[  
    Print #1, "type bsdf_data" M6|Q~8$  
    Print #1, "format angles=deg bsdf=value scale=1" WE`Y!  
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    'Loop the file list, skip the two header lines and write the remaining data to file 4y21v|(9  
    Dim lineArray() As String, curLine As Long kG,6;aVZ8  
    For Each curFile In fList F/RV{} 17E  
        Print "Merging data from file " & curFile h.~S^uKi*  
        ReadFile( cDir & curFile, lineArray ) JYKA@sZHe  
        For curLine = 2 To UBound(lineArray) (g~&$&pa  
            Print #1, lineArray(curLine) tp*AA@~  
        Next l= !KZaH  
    Next rMf& HX  
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    'Close the output file rmR7^Ycv/  
    Close #1 $o1Gxz  
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    Print "Finished merging RPC data for sample " & sampName Fv5@-&y$W  
    Print "FRED formatted data file: " & Chr(9) & outFile @ZK|k  
End Sub g4j?E{M?  
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'Utility function to read the contents of a file into an array of strings. 'ei9* 4y  
Function ReadFile(ByVal fileName As String, _ }L@!TWR-Qu  
                  ByRef lineArray() As String) As Long -jFt4Q7}8  
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    ReadFile = -1 [al$7R&  
    Dim oFSO As Object b^5rV5d  
    Set oFSO = CreateObject("Scripting.FileSystemObject") gnB%/g[_  
    Erase lineArray )0RH"#,2L  
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    Dim fid As Long 81H04L9K 7  
    If oFSO.fileexists( fileName ) Then *]O[ZjyOY  
        fid = FreeFile() B7T(9Tj+Fh  
        Open fileName For Input As fid T3)/?f?|  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) s'fHhG6  
        Close fid =QOtag1;  
    End If IM)\-O\Wd  
    Set oFSO = Nothing oXV  
    Return UBound( lineArray ) n>Q/XQXB  
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End Function 2Wq)y1R<T  
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Sub GetFileList( ByVal in_dir As String, _ 0D:J d6\  
                 ByRef in_flist() As String ) 8KT|ixs  
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    'Redimension the file list array ;wgm 'jr  
    Erase in_flist }N*6xr*X+  
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    'Tracks how many files are found mTYEK4}  
    Dim fCount As Long "F}anPY  
    fCount = 0 0b~5i-zM/  
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    'Recurse directory and search for text files q9yY%  
    Dim f As String @B*?owba>  
    f = Dir$(in_dir & "*.txt") ft4J.oT  
    While f <> "" B.;/N220P  
        ReDim Preserve in_flist(fCount) D*DCMMp=0  
        in_flist(fCount) = f XNf%
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        fCount += 1 :_i1)4[!  
        f = Dir$() %{5mkO&,2  
    Wend @q],pD  
    ReDim Preserve in_flist(fCount-1) S;a{wYF6v  
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End Sub $^y6>@~