[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： eB7>t@ED  
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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。 'jN/~I  
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背景： }/49T  
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。 33,;i
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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。 y]J3hKs  
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步骤 |&Au63  
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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。 2J)74SeH  
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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） l`G(O$ct  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 X:R%1+&*  
例如下所示：
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Sample name:  EDF-C1-56 *$JB`=Q  
Merging data from file EDF-C1-56 0-0.txt 8i[".9}G\  
Finished merging RPC data for sample EDF-C1-56 6hLNJ  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt j=FMYd8$y  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 1Jl{1;c  
a. 创建一个新的散射库 (eki X*y  
b. 散射模型命名 {zY`h6d  
c. 改变散射模型为“Tabulated BSDF”. /z..5r^,ZZ  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） L#`7FaM?  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 UBL(Nr  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， v3?kFd7%H~  
g. 点击OK c%jsu"  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 (LRNU)vD7$  
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脚本代码： [k!-;mi   
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'#Language "WWB-COM" T=^jCH &  
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Option Explicit KlY,NSlQ  
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Sub Main LjSLg[i  
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    'Cleanup _yiRh:  
    ClearOutputWindow() ht2 f-EKf{  
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    Print "Merging RPC Photonics BSDF Data Files" j.<:00<  
    SetTextColor(255,0,0) $Z,i|K;  
    Print "Note: Script should be located in the same folder as the BSDF TXT files."
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." A<mj8qz  
    SetTextColor(0,0,0) U)u\1AV5  
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    'Current directory of this script (should be the same as the text files being merged) +ylxez
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    Dim cDir As String 1RCXc>}/  
    cDir = MacroDir$ & "\" T"n>h
 
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    'Array which will be populated with the list of files to be merged D8)O4bh  
    Dim fList() As String, curFile As String zhuyePn  
    GetFileList( cDir, fList ) ".Lhte R?  
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    Print "" }A^1q5  
    Print "Files found for merging:" f-vZ2+HP  
    For Each curFile In fList 6e-#XCR{  
        Print Chr(9) & curFile $7msL#E7  
    Next #L_@s d  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 7vii9Am7  
    Dim nameArray() As String, sampName As String F5<"ktnI  
    nameArray = Split(fList(0)," 0-0.txt") yB0jL:|a  
    sampName  = nameArray(0) S9$o  
    Print "" ->#y(}  
    Print "Sample name: " & Chr(9) & sampName ;%BhhmR)[  
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    'Open an output file and write the FRED header data hZp=BM"bJ  
    Dim outFile As String <^CYxy  
    outFile = cDir & sampName & "_FRED.txt" mY$nI -P  
    Open outFile For Output As #1 }%-UL{3%
 
    Print #1, "type bsdf_data" \Pw8wayr%  
    Print #1, "format angles=deg bsdf=value scale=1" zj~8>QnKk  
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    'Loop the file list, skip the two header lines and write the remaining data to file xP8iz?6"V  
    Dim lineArray() As String, curLine As Long N90\]dFmy  
    For Each curFile In fList B@ZqJw9J[  
        Print "Merging data from file " & curFile )$ ofl%+  
        ReadFile( cDir & curFile, lineArray ) Xy[4f=X}z  
        For curLine = 2 To UBound(lineArray) =nJOaXR0  
            Print #1, lineArray(curLine) B0-4ZT  
        Next o,*folL  
    Next 1bV2  
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    'Close the output file a/`c ef  
    Close #1 6Y;Y}E  
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    Print "Finished merging RPC data for sample " & sampName Z
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    Print "FRED formatted data file: " & Chr(9) & outFile F3kC"H  
End Sub UI|v/(_^F  
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'Utility function to read the contents of a file into an array of strings. r!{w93rPX  
Function ReadFile(ByVal fileName As String, _
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                  ByRef lineArray() As String) As Long PWf{aHsr  
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    ReadFile = -1 hKk\Y{wv'  
    Dim oFSO As Object Fy}MXe"f  
    Set oFSO = CreateObject("Scripting.FileSystemObject") [<#<:h
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    Erase lineArray uS! 35{.>  
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    Dim fid As Long (P E# Y(  
    If oFSO.fileexists( fileName ) Then [47K7~9p  
        fid = FreeFile() 8CHb~m@^$  
        Open fileName For Input As fid Bg+<*z-?e  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) , aRJ!AZ  
        Close fid l%sp[uqcg  
    End If ,^MW)Gf<  
    Set oFSO = Nothing *=-__|t  
    Return UBound( lineArray ) rK(x4]I l"  
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End Function QOkE\ro  
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Sub GetFileList( ByVal in_dir As String, _ GW>7R6i  
                 ByRef in_flist() As String ) |QAeQWP+1  
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    'Redimension the file list array "!%w9  
    Erase in_flist veYsctK~  
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    'Tracks how many files are found /(hP7_]`2  
    Dim fCount As Long ]MqH13`)A  
    fCount = 0 EzD -1sJ  
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    'Recurse directory and search for text files ]YisZE4s  
    Dim f As String T3u5al  
    f = Dir$(in_dir & "*.txt") #a7Amh\nT  
    While f <> "" Z]7;u>2  
        ReDim Preserve in_flist(fCount) lRF_ k  
        in_flist(fCount) = f -!C Y,'3  
        fCount += 1 GvZac  
        f = Dir$() [6,]9|~  
    Wend :f?,]|]+-  
    ReDim Preserve in_flist(fCount-1) 1K? & J2  
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End Sub g:.,}L  
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