[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： r @}N6U~*  
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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。 ?|~KF:,#}  
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背景：  &Ufp8[  
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。 Y#QXvo%  
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。 e07u@_'^  
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步骤  aWPf3Q  
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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。 }Ogb|8  
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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） =3ovaP  
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 HX)]@qL  
例如下所示： O>'tag  
Sample name:  EDF-C1-56 m/"([Y_  
Merging data from file EDF-C1-56 0-0.txt #0PZa$kM(o  
Finished merging RPC data for sample EDF-C1-56 xS>vmnW  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt sF>O=F-7  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 IEfYg(c0U  
a. 创建一个新的散射库 #^BttI  
b. 散射模型命名 5KP\#Y  
c. 改变散射模型为“Tabulated BSDF”.  S'\e"w  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） {,u})U2  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 C1+f\A|9FP  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， |]9L#  
g. 点击OK uq;yR[w"  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 y+Hz(}4  
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脚本代码： }LeS3\+UHl  
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'#Language "WWB-COM" a#k7 aOT0  
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Option Explicit %`QgG   
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Sub Main <&#
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    'Cleanup PXqG;o*Q*?  
    ClearOutputWindow() ([ -i5  
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    Print "Merging RPC Photonics BSDF Data Files" iPkCuLQ}  
    SetTextColor(255,0,0) #lg R"%  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." lZuH:AH  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." TQmrL  
    SetTextColor(0,0,0) m[KmXPFht1  
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    'Current directory of this script (should be the same as the text files being merged) Q4hY\\Hi  
    Dim cDir As String *c [^/  
    cDir = MacroDir$ & "\" ma+AFCi  
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    'Array which will be populated with the list of files to be merged KPI96P  
    Dim fList() As String, curFile As String X
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    GetFileList( cDir, fList ) Gw
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    Print "" 5A*&!1T  
    Print "Files found for merging:" 8Y.9%@  
    For Each curFile In fList 2aX*|DGpw  
        Print Chr(9) & curFile k=[s%O6H  
    Next \xbUr`WBY  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. o{! :N>(  
    Dim nameArray() As String, sampName As String &b`W<PAc?4  
    nameArray = Split(fList(0)," 0-0.txt") I8j:{*h  
    sampName  = nameArray(0) -F[@)$L  
    Print "" DJ@n$G`^^  
    Print "Sample name: " & Chr(9) & sampName [!yA#{xl,  
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    'Open an output file and write the FRED header data g27'il  
    Dim outFile As String >Rd~-w)!|  
    outFile = cDir & sampName & "_FRED.txt" 3V?x&qlP>  
    Open outFile For Output As #1 5.oIyC^Ik  
    Print #1, "type bsdf_data" : S3+
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    Print #1, "format angles=deg bsdf=value scale=1" pITF%J@_]  
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    'Loop the file list, skip the two header lines and write the remaining data to file z-
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    Dim lineArray() As String, curLine As Long bY=[ USgps  
    For Each curFile In fList )?UoF&c
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        Print "Merging data from file " & curFile 3_Xu3hNH!  
        ReadFile( cDir & curFile, lineArray ) O"+0 b|  
        For curLine = 2 To UBound(lineArray) 8>,w8(Nt  
            Print #1, lineArray(curLine) 5N;'CAk  
        Next w|-
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    Next &.\7='$F  
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    'Close the output file %z-*C'j5H  
    Close #1 )/%5f{+}  
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    Print "Finished merging RPC data for sample " & sampName 5EcVW|(  
    Print "FRED formatted data file: " & Chr(9) & outFile xF8n=Lc  
End Sub P .m@|w&.K  
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'Utility function to read the contents of a file into an array of strings. 1.F&gP)9  
Function ReadFile(ByVal fileName As String, _ _E`+0;O
 
                  ByRef lineArray() As String) As Long v/q-{1  
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    ReadFile = -1 JiaR*3#  
    Dim oFSO As Object At
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    Set oFSO = CreateObject("Scripting.FileSystemObject")  r!?ga  
    Erase lineArray W&*&O,c  
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    Dim fid As Long QMsq4yJ)%  
    If oFSO.fileexists( fileName ) Then oT):#,s  
        fid = FreeFile() igfQ,LWe!  
        Open fileName For Input As fid >bh+!5Y0  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) r |C.K  
        Close fid &sWr)>vs  
    End If heCM+=#~  
    Set oFSO = Nothing }q.D)'g_  
    Return UBound( lineArray ) LJGpa)(  
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End Function lx%c&~.DiB  
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Sub GetFileList( ByVal in_dir As String, _ I?3b}#&V9  
                 ByRef in_flist() As String ) T,pr&1]Lw  
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    'Redimension the file list array B>^6tdz  
    Erase in_flist rF-SvSj}  
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    'Tracks how many files are found \5r^D|Rp}  
    Dim fCount As Long &-yRa45?  
    fCount = 0 bE !SW2:M  
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    'Recurse directory and search for text files z4:!*:.Asu  
    Dim f As String _Sr7b#)o  
    f = Dir$(in_dir & "*.txt") X3:z=X&Zd  
    While f <> "" 1_]X  
        ReDim Preserve in_flist(fCount) E(r_mF7:  
        in_flist(fCount) = f [<RhaZz  
        fCount += 1 L1SKOM$  
        f = Dir$() &)1.z7T  
    Wend )[Tm[o?Y.  
    ReDim Preserve in_flist(fCount-1) xSmG,}3mF  
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End Sub F] c\Qt  
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