[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： 'e3y|  
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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。 2-llT
 
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背景： ZyCAl9{p  
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。 c/;t.+g  
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。 M42Zpb].  
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步骤 \2_>$:UoV  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 =e$ #m;  
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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） -B4uK  
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 <kLY1EILM  
例如下所示：  c
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Sample name:  EDF-C1-56 wrqdQ}@(  
Merging data from file EDF-C1-56 0-0.txt yel>-=Vn  
Finished merging RPC data for sample EDF-C1-56 sB0+21'R  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt C^nL{ZP,  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ^l$(-#'y  
a. 创建一个新的散射库 + A0@#:B  
b. 散射模型命名 -
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c. 改变散射模型为“Tabulated BSDF”. f@LUp^Z/v  
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 ）
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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。 >=U$s@  
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， r0\bi6;s/  
g. 点击OK /4_}wi\  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ljiq+tT  
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脚本代码： T{uktIO/  
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'#Language "WWB-COM" v/m`rc
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Option Explicit Ne^#5T  
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Sub Main ]m4LY.SQ  
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    'Cleanup T&R`s+7  
    ClearOutputWindow() e\yj>tQJg  
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    Print "Merging RPC Photonics BSDF Data Files" Q@$1!9m  
    SetTextColor(255,0,0) ]ei]) J
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    Print "Note: Script should be located in the same folder as the BSDF TXT files." >hQR  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." `/HygC6  
    SetTextColor(0,0,0) 20fCWVw}?}  
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    'Current directory of this script (should be the same as the text files being merged) Qb(
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    Dim cDir As String spl*[ d  
    cDir = MacroDir$ & "\" s &.Z;X
 
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    'Array which will be populated with the list of files to be merged htF&VeIte  
    Dim fList() As String, curFile As String xDQ$Ui.  
    GetFileList( cDir, fList ) y.O? c&!  
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    Print "" 92SB'T>  
    Print "Files found for merging:" VqbiZOZ@  
    For Each curFile In fList Etl7V  
        Print Chr(9) & curFile s]I],>}RU  
    Next
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. <5X@r#Lz  
    Dim nameArray() As String, sampName As String -"cN9RF  
    nameArray = Split(fList(0)," 0-0.txt") [=9R5.)c  
    sampName  = nameArray(0) $<aBawLZO  
    Print "" CD[7h  
    Print "Sample name: " & Chr(9) & sampName ^#=L?e  
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    'Open an output file and write the FRED header data p0tv@8C>  
    Dim outFile As String
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    outFile = cDir & sampName & "_FRED.txt" K&X'^|en  
    Open outFile For Output As #1 I}q-J~s  
    Print #1, "type bsdf_data" Gt1Up~\s  
    Print #1, "format angles=deg bsdf=value scale=1" AH7k|6ku<*  
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    'Loop the file list, skip the two header lines and write the remaining data to file .U1dcL6  
    Dim lineArray() As String, curLine As Long #>,cc?H-  
    For Each curFile In fList NRl"!FSD;"  
        Print "Merging data from file " & curFile D3K`b4YV  
        ReadFile( cDir & curFile, lineArray ) hD,-!R  
        For curLine = 2 To UBound(lineArray) $?s^HKF~  
            Print #1, lineArray(curLine) [qXpi'q[  
        Next Q
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    Next x:bYd\ EJ[  
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    'Close the output file uqyf3bK  
    Close #1 O-B3@qQ. h  
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    Print "Finished merging RPC data for sample " & sampName OM
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    Print "FRED formatted data file: " & Chr(9) & outFile #<~f~{x  
End Sub XgbGC*dQ  
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'Utility function to read the contents of a file into an array of strings. OMZT\$9yT  
Function ReadFile(ByVal fileName As String, _ K
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                  ByRef lineArray() As String) As Long G!~BA*
 
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    ReadFile = -1 HUghl2L.<  
    Dim oFSO As Object Lg?'1dg  
    Set oFSO = CreateObject("Scripting.FileSystemObject") `u}x:f !  
    Erase lineArray Z`*c
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    Dim fid As Long (LfVa`<1  
    If oFSO.fileexists( fileName ) Then ZX0c_Mk=  
        fid = FreeFile() m7"f6zSo(  
        Open fileName For Input As fid }-vBRY  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) &8pXkD#A  
        Close fid _R<HC  
    End If 42u\Y_^ID  
    Set oFSO = Nothing IBqY$K+l  
    Return UBound( lineArray ) z(WpOD  
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End Function bxN;"{>Xz  
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Sub GetFileList( ByVal in_dir As String, _ QdTe!f|  
                 ByRef in_flist() As String ) AAW7@\q.  
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    'Redimension the file list array ["F,|e{y$  
    Erase in_flist W'
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    'Tracks how many files are found LC{hoq\  
    Dim fCount As Long sV<4^n7  
    fCount = 0 2UF94  
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    'Recurse directory and search for text files ~Hs{(7  
    Dim f As String ddP,_.0  
    f = Dir$(in_dir & "*.txt") bw\=F_>L  
    While f <> "" ;N\?]{ L  
        ReDim Preserve in_flist(fCount) PR?clg=z  
        in_flist(fCount) = f ='0!B]<G  
        fCount += 1 _);Kb/  
        f = Dir$() G!8pF  
    Wend kKM%   
    ReDim Preserve in_flist(fCount-1) bY~v
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End Sub qfu2}qUX~%