[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： :5?ti  
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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。 \E.t=XBn  
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背景： 5h[u2&;G  
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。 "}K/ b  
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。 tH:ea$A  
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步骤 *NV`6?o@6  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 6u7(}K  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） @.*[CC;&  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 *ILS/`mdav  
例如下所示： o;Zoj}  
Sample name:  EDF-C1-56 `#fOY$#XB  
Merging data from file EDF-C1-56 0-0.txt CpS'2@6  
Finished merging RPC data for sample EDF-C1-56 ~B(]0:  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt LO.4sO  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 =[{Pw8['  
a. 创建一个新的散射库 i*_KHK  
b. 散射模型命名 R)cns7oW  
c. 改变散射模型为“Tabulated BSDF”. '! 1ts@  
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 ） -f9M*7O<gf  
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。 46_<v=YSJ  
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， w#F+rh3  
g. 点击OK ? z=>n  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 lha)'
 
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脚本代码： T|.Q81.NE  
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'#Language "WWB-COM" ,zXL8T  
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Option Explicit c;U\nC<Y  
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Sub Main k|A!5A2  
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    'Cleanup 5.?O PK6  
    ClearOutputWindow() h!K B%4V  
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    Print "Merging RPC Photonics BSDF Data Files" e!4akKw4wD  
    SetTextColor(255,0,0) Qmn5umd=?\  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." dt`L}Yi  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." B10p7+NBF  
    SetTextColor(0,0,0) izFu&syv)  
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    'Current directory of this script (should be the same as the text files being merged) +ypG<VBx%  
    Dim cDir As String $#RD3#=?u  
    cDir = MacroDir$ & "\" do[K-r  
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    'Array which will be populated with the list of files to be merged w|L~+   
    Dim fList() As String, curFile As String On'3K+(_  
    GetFileList( cDir, fList ) G4x.''r&Sl  
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    Print "" keJec`q=X  
    Print "Files found for merging:" g~B@=R  
    For Each curFile In fList l
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        Print Chr(9) & curFile _23sIUN c3  
    Next 0'py7  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. UkqLLzL  
    Dim nameArray() As String, sampName As String ';ZJuJ.  
    nameArray = Split(fList(0)," 0-0.txt") COHJJONR  
    sampName  = nameArray(0) chd${ j  
    Print "" pM46I"  
    Print "Sample name: " & Chr(9) & sampName VBH[aIW  
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    'Open an output file and write the FRED header data rqF PUp  
    Dim outFile As String u^]yz&9V  
    outFile = cDir & sampName & "_FRED.txt" grfF\_[:  
    Open outFile For Output As #1 ]~K&mNo  
    Print #1, "type bsdf_data" rmabm\QY  
    Print #1, "format angles=deg bsdf=value scale=1" i;xg[e8.  
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    'Loop the file list, skip the two header lines and write the remaining data to file KbUX(9+B  
    Dim lineArray() As String, curLine As Long ##s!-.T  
    For Each curFile In fList  ;etQ  
        Print "Merging data from file " & curFile T^nX+;:|  
        ReadFile( cDir & curFile, lineArray ) xlwsZm{V  
        For curLine = 2 To UBound(lineArray) 9{TOFjsF  
            Print #1, lineArray(curLine) I"!gzI`Sd  
        Next [e}]K:  
    Next bv+e'$U3  
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    'Close the output file 7q^/.:wlf  
    Close #1 Tb)x8-0  
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    Print "Finished merging RPC data for sample " & sampName b?Jm)  
    Print "FRED formatted data file: " & Chr(9) & outFile kdHql>0  
End Sub <Z__Q  
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'Utility function to read the contents of a file into an array of strings. RdDcMZ  
Function ReadFile(ByVal fileName As String, _ ZbrE m  
                  ByRef lineArray() As String) As Long = ]@xXVf/  
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    ReadFile = -1 %nCUct@c  
    Dim oFSO As Object r{TNPa6!  
    Set oFSO = CreateObject("Scripting.FileSystemObject") _@p|A  
    Erase lineArray 0K2[E^.WN  
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    Dim fid As Long Q&#:M>!|  
    If oFSO.fileexists( fileName ) Then (s3%1OC[  
        fid = FreeFile() }dHiW:J>  
        Open fileName For Input As fid -Q@d  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) kC k-  
        Close fid >'jM8=o*Ax  
    End If m2! 7M%]GC  
    Set oFSO = Nothing .UYpPuAkn  
    Return UBound( lineArray ) yTn@p(J  
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End Function S|J8:-  
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Sub GetFileList( ByVal in_dir As String, _ { &'TA  
                 ByRef in_flist() As String ) Imwx~eo  
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    'Redimension the file list array sy?>e*-{  
    Erase in_flist
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    'Tracks how many files are found Za6oYM_z  
    Dim fCount As Long d!t@A  
    fCount = 0 Ueeay^zN  
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    'Recurse directory and search for text files _tk5?9Ykn  
    Dim f As String p~.@8r(  
    f = Dir$(in_dir & "*.txt") cP1jw%3P  
    While f <> "" UIl
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        ReDim Preserve in_flist(fCount) 'O`3FI  
        in_flist(fCount) = f q KM]wu0Et  
        fCount += 1 zvf]}mNx  
        f = Dir$() W.|6$hRl)  
    Wend JqUVGEg  
    ReDim Preserve in_flist(fCount-1) c6HU'%v  
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End Sub ?lK!OyCkc  
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