[技术]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。 wLC|mByq  
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背景： S<LHNZu|^A  
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。 PTvP;  
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。 D|n`9yv a  
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步骤 _A\c 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。 .)mw~3]  
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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） Rj%q)aw'  
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 t{K1ht$[:  
例如下所示： W$P)fPU'  
Sample name:  EDF-C1-56 |k>
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Merging data from file EDF-C1-56 0-0.txt P$D1kcCw  
Finished merging RPC data for sample EDF-C1-56 C=AX{sn  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt y)!K@  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 K$\]\qG6  
a. 创建一个新的散射库 4>>d "<}C  
b. 散射模型命名 qMz0R\4  
c. 改变散射模型为“Tabulated BSDF”. V5RfxWtm:  
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 ） 6P!M+PO  
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。 (Y!@,rKd  
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， Ut8yA"Y~  
g. 点击OK t*^Q`V wQ  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 (6fh[eK86  
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脚本代码： y#^d8 }+  
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'#Language "WWB-COM" Ry0n_J:7  
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Option Explicit 4jj@"*^a  
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Sub Main Fmk, "qs  
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    'Cleanup ]Z@-r  
    ClearOutputWindow() IiIF4 pQ,  
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    Print "Merging RPC Photonics BSDF Data Files" _bn*B$  
    SetTextColor(255,0,0) d?
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    Print "Note: Script should be located in the same folder as the BSDF TXT files." /e6\F7  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." y}5H<ZcXA  
    SetTextColor(0,0,0) z'MOuz~Y  
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    'Current directory of this script (should be the same as the text files being merged) y'pAhdF  
    Dim cDir As String p0UR5A>p  
    cDir = MacroDir$ & "\" -Yy,L%E]F:  
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    'Array which will be populated with the list of files to be merged ">*PH}b  
    Dim fList() As String, curFile As String $+)SW{7  
    GetFileList( cDir, fList ) 3Qfj=; 4  
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    Print "" vu;pILN  
    Print "Files found for merging:" a8FC#kfq  
    For Each curFile In fList <|~X,g;f  
        Print Chr(9) & curFile  [ K;3Qf)  
    Next B_anO{3$4  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. (u+3{Eb  
    Dim nameArray() As String, sampName As String *f=H#  
    nameArray = Split(fList(0)," 0-0.txt") Mk7,:S  
    sampName  = nameArray(0) x-+Hy\^@|  
    Print "" L\
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    Print "Sample name: " & Chr(9) & sampName pM=@  
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    'Open an output file and write the FRED header data %,E\8{I+  
    Dim outFile As String Q-_&5/G  
    outFile = cDir & sampName & "_FRED.txt" \m~?mg"#  
    Open outFile For Output As #1 MJd!J]E6  
    Print #1, "type bsdf_data" Lf{9=;  
    Print #1, "format angles=deg bsdf=value scale=1" h.E8G^}@  
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    'Loop the file list, skip the two header lines and write the remaining data to file Lqb9gUJ:U  
    Dim lineArray() As String, curLine As Long )"q$g&  
    For Each curFile In fList ,&rlt+wE  
        Print "Merging data from file " & curFile (;;%B=  
        ReadFile( cDir & curFile, lineArray ) R$IxR=hMx  
        For curLine = 2 To UBound(lineArray) Ds? @LE|  
            Print #1, lineArray(curLine) fgK1+sW  
        Next 8e:J{EG~  
    Next \3LP@;Phn  
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    'Close the output file z^j7wMQ  
    Close #1 kHygif !I4  
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    Print "Finished merging RPC data for sample " & sampName (-viP  
    Print "FRED formatted data file: " & Chr(9) & outFile Kur3Gf X  
End Sub /]zn8d  
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'Utility function to read the contents of a file into an array of strings. @&p:J0hbp  
Function ReadFile(ByVal fileName As String, _ byoP1F%  
                  ByRef lineArray() As String) As Long @&#k['c  
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    ReadFile = -1 4u- mE  
    Dim oFSO As Object $5N%!  
    Set oFSO = CreateObject("Scripting.FileSystemObject") mQdF+b1o  
    Erase lineArray S-l<+O1fy  
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    Dim fid As Long f]%:.N~1w  
    If oFSO.fileexists( fileName ) Then 
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        fid = FreeFile() *:S_v.Y3"  
        Open fileName For Input As fid =?]H`T:  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) LH/lnrN  
        Close fid  |Hx#Uk#  
    End If 0M=A,`qk  
    Set oFSO = Nothing D1hy:KkAv]  
    Return UBound( lineArray ) P/i{_r
 
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End Function }z%fQbw  
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Sub GetFileList( ByVal in_dir As String, _ Y;2WY0eq  
                 ByRef in_flist() As String ) \#Md3!MG  
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    'Redimension the file list array rlxZ,

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    Erase in_flist dRj2%Q f  
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    'Tracks how many files are found )Fk*'6  
    Dim fCount As Long &:Q^j:  
    fCount = 0 'Ur1I"  
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    'Recurse directory and search for text files Gak@Z!|  
    Dim f As String s
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    f = Dir$(in_dir & "*.txt") {A^3<=|  
    While f <> "" 4eVQO
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        ReDim Preserve in_flist(fCount) Kk.a9uKI}  
        in_flist(fCount) = f /bdL.Y#V  
        fCount += 1 Qe,jK{Y< -  
        f = Dir$() E8X(AZ 2  
    Wend ^!&6z4DP  
    ReDim Preserve in_flist(fCount-1) N+lhztYQ?  
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End Sub X$r5KJU