[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： pbloL3d.;+  
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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。 .i
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背景： q$>At}4  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 1_XdL?h#o  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 mA3C)V  
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步骤 sq&$  
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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。 xNE<$Bz  
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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） u@[D*c1!H  
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 v3
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例如下所示： z9'ME   
Sample name:  EDF-C1-56 #RZW)Br
 
Merging data from file EDF-C1-56 0-0.txt y$K!g&lGA  
Finished merging RPC data for sample EDF-C1-56 ~/iE  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt W[w8@OCNf  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ^5j9WV  
a. 创建一个新的散射库 XQHvs{Po  
b. 散射模型命名 Pou`PNvH  
c. 改变散射模型为“Tabulated BSDF”. T+N%KRl  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） rjx6Ad/\  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 }(20MW8rMc  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， y`7BR?l  
g. 点击OK h68s
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 /&cb`^"U^  
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脚本代码： b2r@vZ]D  
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'#Language "WWB-COM" qL UbRp  
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Option Explicit OUS@)Tyh  
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Sub Main qZG "{8  
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    'Cleanup Nt'(JAZ;  
    ClearOutputWindow() Xr6UN{_-  
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    Print "Merging RPC Photonics BSDF Data Files" *";,HG?|Iz  
    SetTextColor(255,0,0) 3-Xum*)Y  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 7b \HbgZ  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." &0*j n
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    SetTextColor(0,0,0) ,*}SfCon  
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    'Current directory of this script (should be the same as the text files being merged) mJ
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    Dim cDir As String q.g<gu]  
    cDir = MacroDir$ & "\" Y u8a8p|  
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    'Array which will be populated with the list of files to be merged XGbtmmQG  
    Dim fList() As String, curFile As String Fp'k{  
    GetFileList( cDir, fList ) 
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    Print "" R<a7TkL4?  
    Print "Files found for merging:"
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    For Each curFile In fList TmvI+AY/  
        Print Chr(9) & curFile \%K< S  
    Next 4b,N"w{v  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. w|OMT>.  
    Dim nameArray() As String, sampName As String )lTkqz8v  
    nameArray = Split(fList(0)," 0-0.txt") c7[|x%~  
    sampName  = nameArray(0) `h+sSIko  
    Print "" _qR1M):yJ  
    Print "Sample name: " & Chr(9) & sampName ))K3pKyb  
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    'Open an output file and write the FRED header data N~=p+Ow[H  
    Dim outFile As String -WWa`,:  
    outFile = cDir & sampName & "_FRED.txt" ^dJ/>?1  
    Open outFile For Output As #1 t$m268m~  
    Print #1, "type bsdf_data" xrFFmQ<_W  
    Print #1, "format angles=deg bsdf=value scale=1" oe=^CeW"  
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    'Loop the file list, skip the two header lines and write the remaining data to file RLu y;z  
    Dim lineArray() As String, curLine As Long $8k
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    For Each curFile In fList A36dj  
        Print "Merging data from file " & curFile }S\\"SBC  
        ReadFile( cDir & curFile, lineArray ) -R?~Yysd7K  
        For curLine = 2 To UBound(lineArray) $Y5R^Y  
            Print #1, lineArray(curLine) p-POg%|&<  
        Next rwWs\~.H  
    Next U3}r.9/  
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    'Close the output file w+)MrB-}  
    Close #1 Rq-BsMX!A  
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    Print "Finished merging RPC data for sample " & sampName z@R:~  
    Print "FRED formatted data file: " & Chr(9) & outFile %5?qS`/c(  
End Sub ] lE6:^V  
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'Utility function to read the contents of a file into an array of strings. 8=Xy19<;t  
Function ReadFile(ByVal fileName As String, _ a/A$ MXZ_  
                  ByRef lineArray() As String) As Long ?W:YS82  
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    ReadFile = -1 %JF.m$-  
    Dim oFSO As Object 3J%(2}{y  
    Set oFSO = CreateObject("Scripting.FileSystemObject") :s`~m;Y9?  
    Erase lineArray !ba /]A
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    Dim fid As Long `CP#S7W^  
    If oFSO.fileexists( fileName ) Then d:cs8f4>  
        fid = FreeFile() "#anL8  
        Open fileName For Input As fid q,w8ca4~y  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) owM3Gz%?UA  
        Close fid 9y"R,  
    End If wqEO+7)S  
    Set oFSO = Nothing 4iMo&E<  
    Return UBound( lineArray ) "Qj;pqR  
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End Function |3j'HN5S  
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Sub GetFileList( ByVal in_dir As String, _ )!M %clm.  
                 ByRef in_flist() As String ) pB*8D  
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    'Redimension the file list array J
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    Erase in_flist :)hS-*P  
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    'Tracks how many files are found /qM:;:N%
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    Dim fCount As Long Z3X/SQ'0  
    fCount = 0 gx,BF#8}  
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    'Recurse directory and search for text files B7HNNX  
    Dim f As String D_mdX9-~  
    f = Dir$(in_dir & "*.txt") oRH]67(Z  
    While f <> "" Z&BJ/qk \-  
        ReDim Preserve in_flist(fCount) 

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        in_flist(fCount) = f X <QSi
 
        fCount += 1 BSU%.tmI  
        f = Dir$()  &ig6\&1  
    Wend 1o5n1 A  
    ReDim Preserve in_flist(fCount-1) =*<Cw?Gc  
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End Sub 2GB)K?1M  
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