[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： Hx*;jpy(2  
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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。 ,J>5:ht(6  
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背景： <|+Ex  
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。 x+x40!+\  
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。 pd7NF-KD  
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步骤 vbB
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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。 !~&R"2/  
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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） TAF PawH  
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 {{MRELipW  
例如下所示： 7:3$Ey  
Sample name:  EDF-C1-56 &LVn6zAba  
Merging data from file EDF-C1-56 0-0.txt ayD}r#7  
Finished merging RPC data for sample EDF-C1-56 k |%B?\m  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt y_IM@)1H~  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 #Av.iAs  
a. 创建一个新的散射库 q
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b. 散射模型命名 &8_gRP  
c. 改变散射模型为“Tabulated BSDF”. ;)e2@'Agl  
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 ） .0rh y2  
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。 Upd3-2kr&J  
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， h!ZV8yMc  
g. 点击OK Mt5PaTjj  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 MP 2~;T}~  
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脚本代码： rT5Ycm@  
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'#Language "WWB-COM" 
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Option Explicit q**G(}K  
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Sub Main Z%Zd2 v  
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    'Cleanup '-b*EZU8t  
    ClearOutputWindow() ?Poq2
 
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    Print "Merging RPC Photonics BSDF Data Files" Yf~{I-|`q  
    SetTextColor(255,0,0) .?e\I`Kk^'  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." pV,P|>YTf  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." +d!v}aJ  
    SetTextColor(0,0,0) Za8#$`zq  
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    'Current directory of this script (should be the same as the text files being merged) 09kt[  
    Dim cDir As String Fa_VKAq  
    cDir = MacroDir$ & "\" jR#~I@q^  
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    'Array which will be populated with the list of files to be merged wqW0v\  
    Dim fList() As String, curFile As String _}VloiY  
    GetFileList( cDir, fList ) ^=SD9V  
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    Print "" s)2fG\1  
    Print "Files found for merging:" mL`5uf  
    For Each curFile In fList ' dx1x6  
        Print Chr(9) & curFile  \qR %%S  
    Next S (N\cw$  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. z2hc.29t  
    Dim nameArray() As String, sampName As String @%
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    nameArray = Split(fList(0)," 0-0.txt") L%c0Z@[~  
    sampName  = nameArray(0) n` TSu$  
    Print "" &o97u4xi  
    Print "Sample name: " & Chr(9) & sampName lF?tQB/a  
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    'Open an output file and write the FRED header data 3^~KB'RZ  
    Dim outFile As String ?9=9C"&s  
    outFile = cDir & sampName & "_FRED.txt" 2'<[7
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    Open outFile For Output As #1 u=/CRjot  
    Print #1, "type bsdf_data" _fP&&}  
    Print #1, "format angles=deg bsdf=value scale=1" )){9&5,0:  
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    'Loop the file list, skip the two header lines and write the remaining data to file S
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    Dim lineArray() As String, curLine As Long (nab
 
    For Each curFile In fList Tl|:9_:t  
        Print "Merging data from file " & curFile LtKI3ou  
        ReadFile( cDir & curFile, lineArray ) la?Wnw  
        For curLine = 2 To UBound(lineArray) rf%7b8[v  
            Print #1, lineArray(curLine) ;kJA'|GX  
        Next 0% #<c p  
    Next Pv+5K*"7Cg  
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    'Close the output file 3 Lsj}p  
    Close #1 cl*PFQp9j  
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    Print "Finished merging RPC data for sample " & sampName T!}[yW  
    Print "FRED formatted data file: " & Chr(9) & outFile @hImk`&[N  
End Sub BMIyskl=i  
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'Utility function to read the contents of a file into an array of strings. =FT98H2*|  
Function ReadFile(ByVal fileName As String, _ .+(
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                  ByRef lineArray() As String) As Long 3TZ*RPmFRm  
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    ReadFile = -1 d@3
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    Dim oFSO As Object EK$Kee}~
 
    Set oFSO = CreateObject("Scripting.FileSystemObject") `O8b1-1q~  
    Erase lineArray :aIN9;  
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    Dim fid As Long ?P7]u>H  
    If oFSO.fileexists( fileName ) Then gxGrspqg  
        fid = FreeFile() \OpoBXh  
        Open fileName For Input As fid O!Z|r?  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 45H!;Qsk  
        Close fid irZFV  
    End If Px>va01n  
    Set oFSO = Nothing pBC<u  
    Return UBound( lineArray ) h`}3h< 8  
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End Function 2w$twW-  
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Sub GetFileList( ByVal in_dir As String, _ {3Vk p5%l  
                 ByRef in_flist() As String ) ='E$-_  
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    'Redimension the file list array l#wdpD a{  
    Erase in_flist D8# on!  
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    'Tracks how many files are found $,hwU3RVxc  
    Dim fCount As Long ?QDWuPhN  
    fCount = 0 ]fI/(e_U  
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    'Recurse directory and search for text files ^SfS~GQ  
    Dim f As String 1Ee>S\9t  
    f = Dir$(in_dir & "*.txt") cD
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    While f <> "" @oG)LT  
        ReDim Preserve in_flist(fCount) v}v 5  
        in_flist(fCount) = f I6L
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        fCount += 1 J:F^ #gW  
        f = Dir$() U~2`P  
    Wend #m8sK(#lo  
    ReDim Preserve in_flist(fCount-1) wn11\j&  
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End Sub ;#G%U!p