[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Grw|8xN0t  
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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。 UL.x*@o  
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背景： 5L4{8X0X8  
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]OVc<F  
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。 Qs5^kddz=  
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步骤 @H^Yf  
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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。 :_FnQhzg  
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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） T!*lTzNHm  
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 `i,l)X]  
例如下所示： r{T}pc>^  
Sample name:  EDF-C1-56 /RzL,~]  
Merging data from file EDF-C1-56 0-0.txt `'Af`u\R  
Finished merging RPC data for sample EDF-C1-56 U- UD27  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt V6C*d:  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 m["`Op4  
a. 创建一个新的散射库 eI7FbOze  
b. 散射模型命名 =-e`OHA  
c. 改变散射模型为“Tabulated BSDF”. ,33[/j  
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 ） qQu}4Ye>  
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。 R>iRnrn:-  
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， '*~_!lE5  
g. 点击OK 5DEK`#*  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 69{BJ]q  
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脚本代码： 8tR(i[L   
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'#Language "WWB-COM"  0#AS>K5  
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Option Explicit vjc
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Sub Main wsnR$FhQ`  
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    'Cleanup PtUea  
    ClearOutputWindow() WPmH4L>T  
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    Print "Merging RPC Photonics BSDF Data Files" wE.CZ%f  
    SetTextColor(255,0,0) Vy:I[@6@+  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ' DZYN {}  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." \{HbL,s  
    SetTextColor(0,0,0) (}W+W\.  
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    'Current directory of this script (should be the same as the text files being merged) OO Hw-MW  
    Dim cDir As String x +=zG4Hm  
    cDir = MacroDir$ & "\" TzC'xWO  
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    'Array which will be populated with the list of files to be merged /!l$Y?  
    Dim fList() As String, curFile As String eD4qh4|u.  
    GetFileList( cDir, fList ) -K 7jigac  
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    Print "" ^usZ&9"@P  
    Print "Files found for merging:" o=t@83Fh5  
    For Each curFile In fList FUVoKX!#  
        Print Chr(9) & curFile o7/S'Haxc]  
    Next dr|>P*  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. )U?Tmh  
    Dim nameArray() As String, sampName As String u3"0K['3  
    nameArray = Split(fList(0)," 0-0.txt") WIe7>wkC  
    sampName  = nameArray(0) yqaLqZ$  
    Print "" 7,MDFO{
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    Print "Sample name: " & Chr(9) & sampName iP7 Cku}l  
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    'Open an output file and write the FRED header data {t.5cX"[  
    Dim outFile As String fgiOYvIS2m  
    outFile = cDir & sampName & "_FRED.txt" Tz\PQ)!  
    Open outFile For Output As #1 DChqcdx~~  
    Print #1, "type bsdf_data" TzaR{0 1  
    Print #1, "format angles=deg bsdf=value scale=1" XX85]49`%  
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    'Loop the file list, skip the two header lines and write the remaining data to file uwQ~4   
    Dim lineArray() As String, curLine As Long #41xzN  
    For Each curFile In fList MI: rH  
        Print "Merging data from file " & curFile Lro[ |A  
        ReadFile( cDir & curFile, lineArray ) eP d  
        For curLine = 2 To UBound(lineArray) 03ol6y )C  
            Print #1, lineArray(curLine) h
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        Next :%6OFO$z  
    Next ($Cy-p  
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    'Close the output file TY."?` [FK  
    Close #1 ''bh{ .x  
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    Print "Finished merging RPC data for sample " & sampName ~[_u@8l!mN  
    Print "FRED formatted data file: " & Chr(9) & outFile ^tMb"WO  
End Sub N('=qp9  
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'Utility function to read the contents of a file into an array of strings. .3X5
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Function ReadFile(ByVal fileName As String, _ I7@|{L1|FB  
                  ByRef lineArray() As String) As Long S!Alno  
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    ReadFile = -1 YFJw<5&  
    Dim oFSO As Object *^ZJ&.  
    Set oFSO = CreateObject("Scripting.FileSystemObject") *~D|M  
    Erase lineArray F@]9oF  
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    Dim fid As Long y%Q0* _  
    If oFSO.fileexists( fileName ) Then </hv{<  
        fid = FreeFile() ty"|yA  
        Open fileName For Input As fid 3X;k c>  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) e(=() :4is  
        Close fid B
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    End If `rLcJcW  
    Set oFSO = Nothing H[S}&l\D4  
    Return UBound( lineArray ) l&/V4V-  
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End Function kxanzsSr9  
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Sub GetFileList( ByVal in_dir As String, _ qa\e`LD%Y  
                 ByRef in_flist() As String ) L">\c5ca  
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    'Redimension the file list array rAn:hR
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    Erase in_flist YE*%Y["  
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    'Tracks how many files are found &E]<dmR  
    Dim fCount As Long Q$yMU[l)  
    fCount = 0 x5(6U>-Y  
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    'Recurse directory and search for text files Sx0/Dm  
    Dim f As String t]CA!i`  
    f = Dir$(in_dir & "*.txt") E0*KKo%  
    While f <> "" gTS}'w{  
        ReDim Preserve in_flist(fCount) ? K,d  
        in_flist(fCount) = f :MP*Xy\7&J  
        fCount += 1 &-$27  
        f = Dir$() j|KjQ'9  
    Wend Ol sX  
    ReDim Preserve in_flist(fCount-1) /fSsh;F  
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End Sub 8FIk|p|l^  
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