[分享]RPC Photonics扩散片BSDF [复制链接]

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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。 jf@#&%AC9  
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背景： //g~1(  
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。 ]QRhTz  
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。  ^~?VD  
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步骤 $yBU ,lu}  
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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。 ^I@43Jy/  
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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） P'
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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 wYPJji D  
例如下所示： Jr|"`f%V  
Sample name:  EDF-C1-56 }qRYXjS  
Merging data from file EDF-C1-56 0-0.txt vA*!82  
Finished merging RPC data for sample EDF-C1-56 RKx" }<#+  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt N.l+9L0b  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 %TP0i#J  
a. 创建一个新的散射库 Quqts(Q)+  
b. 散射模型命名 m6bAvy]3<t  
c. 改变散射模型为“Tabulated BSDF”. [g`
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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 ） LY-
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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。 `a*[@a#  
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， k7'_  
g. 点击OK mY+Jju1  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Dqs{n?@n  
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脚本代码： 4 bw8^  
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'#Language "WWB-COM" 7LbBS:@3z_  
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Option Explicit BRLrD/8Le  
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Sub Main IVjH.BzH9  
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    'Cleanup ZEYT17g]  
    ClearOutputWindow() tURjIt,I  
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    Print "Merging RPC Photonics BSDF Data Files" d="Oge8  
    SetTextColor(255,0,0) MqDz cB]  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." <
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." }6*+>?  
    SetTextColor(0,0,0) G>&Tap>  
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    'Current directory of this script (should be the same as the text files being merged) ry)g<OA  
    Dim cDir As String &@p_g8r#  
    cDir = MacroDir$ & "\" % put=I  
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    'Array which will be populated with the list of files to be merged bFD vCF  
    Dim fList() As String, curFile As String <=[,_P6|  
    GetFileList( cDir, fList ) 0}t
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    Print "" +L03.rf  
    Print "Files found for merging:" `K5Lp>=R  
    For Each curFile In fList E%8Op{zv_  
        Print Chr(9) & curFile -}#=L@  
    Next ?y_W%ogW  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?-C=_eZJ  
    Dim nameArray() As String, sampName As String BPs|qb-  
    nameArray = Split(fList(0)," 0-0.txt") X$Eg(^La  
    sampName  = nameArray(0) 5-qk"@E W  
    Print "" <cS"oBh&u0  
    Print "Sample name: " & Chr(9) & sampName 6Y9FU  
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    'Open an output file and write the FRED header data Kcf1$`
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    Dim outFile As String Qf|x]x*5  
    outFile = cDir & sampName & "_FRED.txt" rHYSS0*3  
    Open outFile For Output As #1 r{2V`h1/|  
    Print #1, "type bsdf_data" 2MY
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    Print #1, "format angles=deg bsdf=value scale=1" +U9m  
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    'Loop the file list, skip the two header lines and write the remaining data to file T6mbGE*IeE  
    Dim lineArray() As String, curLine As Long r'*x><m'  
    For Each curFile In fList X?'ShXI  
        Print "Merging data from file " & curFile Xf 0)i  
        ReadFile( cDir & curFile, lineArray ) 3lr9nBR  
        For curLine = 2 To UBound(lineArray) QiO4fS'~W  
            Print #1, lineArray(curLine) T<XGG_NOl  
        Next @>:V?  
    Next @2(7 ZxI  
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    'Close the output file :DWvH,{+&  
    Close #1 ,j
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    Print "Finished merging RPC data for sample " & sampName &k53*Wo  
    Print "FRED formatted data file: " & Chr(9) & outFile vX?MB  
End Sub n0)0"S|y1  
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'Utility function to read the contents of a file into an array of strings. k|uW~I)  
Function ReadFile(ByVal fileName As String, _ \iL{q^Im  
                  ByRef lineArray() As String) As Long B|I9Ex~L  
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    ReadFile = -1 Z01BzIsR  
    Dim oFSO As Object '0b!lVe  
    Set oFSO = CreateObject("Scripting.FileSystemObject") t.\<Q#bN#  
    Erase lineArray U~3uu&/r  
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    Dim fid As Long x)}.@\&%  
    If oFSO.fileexists( fileName ) Then /FJ.W<hw  
        fid = FreeFile() 6&9}M Oc  
        Open fileName For Input As fid 1 sJtkge:  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) o,NTIh  
        Close fid 7=3'PfS  
    End If 78~;j1^6u  
    Set oFSO = Nothing RKi11z  
    Return UBound( lineArray ) u B~C8}  
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End Function e};\"^HH  
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Sub GetFileList( ByVal in_dir As String, _ !#[B#DZc(  
                 ByRef in_flist() As String ) !=)b2}e/>  
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    'Redimension the file list array 6Mc&gnN  
    Erase in_flist pLdZB9oD]C  
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    'Tracks how many files are found *DD
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    Dim fCount As Long )swu~Wb}U@  
    fCount = 0 V|\dnVQ'-%  
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    'Recurse directory and search for text files UwtLvd  
    Dim f As String a>H8,a  
    f = Dir$(in_dir & "*.txt") U0m 5Rc  
    While f <> "" "L9yG:  
        ReDim Preserve in_flist(fCount) "7z1V{ ;Y  
        in_flist(fCount) = f  j1~'[  
        fCount += 1 ?9Hs,J  
        f = Dir$() P:OI]x4  
    Wend \cx==[&(  
    ReDim Preserve in_flist(fCount-1) p)e?0m26  
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End Sub x=I|O;"><  
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