[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： ?C;JJ#Ho  
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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。 }C6@c1myq-  
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背景： ia{kab|_5  
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。 L7q |^`  
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。 ZlR!s!vv  
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步骤 |O (G nsZ  
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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。 LpWI>sNv  
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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） Fj=NiZ=  
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 gue(C(~.k_  
例如下所示： rihlae5Kz  
Sample name:  EDF-C1-56 1D1b"o  
Merging data from file EDF-C1-56 0-0.txt |~$7X  
Finished merging RPC data for sample EDF-C1-56 D VwCx
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt a-PGW2G  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 YFx=b!/s  
a. 创建一个新的散射库 njMLyT($  
b. 散射模型命名 5u,sx664  
c. 改变散射模型为“Tabulated BSDF”. rSyaZ6#  
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 ） xH$%5@~  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 S}gD,7@  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， <o@)SD~K  
g. 点击OK 2LhE]O(_"  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 *Mi6  
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脚本代码： lG]GlgSs  
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'#Language "WWB-COM" <nA3Sd"QfV  
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Option Explicit "k
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Sub Main {HuLuP0t  
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    'Cleanup Ihef$,  
    ClearOutputWindow() E& ]_U$  
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    Print "Merging RPC Photonics BSDF Data Files" -A@U0=o  
    SetTextColor(255,0,0) I"V3+2e  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." )dg UmN
 
    Print "Note: Do not run this script multiple times without deleting the output file between executions." w4}(Ab<Y  
    SetTextColor(0,0,0) ZOHRUm  
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    'Current directory of this script (should be the same as the text files being merged) YHh u^}|jQ  
    Dim cDir As String r %xB8e9  
    cDir = MacroDir$ & "\" `q1}6U/k  
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    'Array which will be populated with the list of files to be merged w{ m#Yt  
    Dim fList() As String, curFile As String )`RZkCe  
    GetFileList( cDir, fList ) 3mA/Nu_  
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    Print "" HjPH  
    Print "Files found for merging:" *<3iEeO/R  
    For Each curFile In fList g{&PrE'e9  
        Print Chr(9) & curFile 8)`5P\  
    Next g[<uwknf  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. %>NRna  
    Dim nameArray() As String, sampName As String 9;:7e*x]lc  
    nameArray = Split(fList(0)," 0-0.txt") RA~_
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    sampName  = nameArray(0) iy9VruT<x  
    Print "" OAyE/Q|  
    Print "Sample name: " & Chr(9) & sampName 2c*2\93>  
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    'Open an output file and write the FRED header data fa.f(c
  
    Dim outFile As String h!;MBn`8  
    outFile = cDir & sampName & "_FRED.txt" CY\mU_.b  
    Open outFile For Output As #1 CCwK8`%  
    Print #1, "type bsdf_data" LQ|<3]  
    Print #1, "format angles=deg bsdf=value scale=1" .Px,=56$X  
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    'Loop the file list, skip the two header lines and write the remaining data to file ri;r7Y9V9`  
    Dim lineArray() As String, curLine As Long 1 pYsjo~  
    For Each curFile In fList PE +qYCpP9  
        Print "Merging data from file " & curFile a\|X^%2g  
        ReadFile( cDir & curFile, lineArray )  pe|\'<>i  
        For curLine = 2 To UBound(lineArray) j[BgP\&,  
            Print #1, lineArray(curLine) :'TX"E!  
        Next +0)5H>h  
    Next Kjvs@~6t  
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    'Close the output file ol1AD: Ho  
    Close #1 %hrsE5k^,  
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    Print "Finished merging RPC data for sample " & sampName LE Jlo%M  
    Print "FRED formatted data file: " & Chr(9) & outFile ug>]U ~0  
End Sub fG^7@Jw:G  
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'Utility function to read the contents of a file into an array of strings. `jt(DKB+J  
Function ReadFile(ByVal fileName As String, _ ]oo|o1H87  
                  ByRef lineArray() As String) As Long j=p|'`  
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    ReadFile = -1 J78Qj[v  
    Dim oFSO As Object "otr+.{`*  
    Set oFSO = CreateObject("Scripting.FileSystemObject") yzODF>KJ  
    Erase lineArray puk4D  
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    Dim fid As Long ',<{X(#(  
    If oFSO.fileexists( fileName ) Then Gf!t< =T   
        fid = FreeFile() _y.mpX&  
        Open fileName For Input As fid 1"N/ZKF-x  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) DB!uv[c  
        Close fid
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    End If BD<rQmfA^  
    Set oFSO = Nothing Hd96[Uo  
    Return UBound( lineArray ) $=X!nQ& Z|  
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End Function r< N-A?a  
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Sub GetFileList( ByVal in_dir As String, _ |v,}%UN2  
                 ByRef in_flist() As String ) V/+H_=|  
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    'Redimension the file list array 6uv'r;U]  
    Erase in_flist <5C=i:6%  
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    'Tracks how many files are found ;w>Q{z  
    Dim fCount As Long [j]}$fFe  
    fCount = 0 \f~u85  
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    'Recurse directory and search for text files q>wa#1X)  
    Dim f As String ~`a#h#  
    f = Dir$(in_dir & "*.txt") <<~lV5  
    While f <> "" HQjxJd5P  
        ReDim Preserve in_flist(fCount) _%C_uBLi  
        in_flist(fCount) = f [0( E>vm  
        fCount += 1 UeIqAG8  
        f = Dir$() C{U[w^X  
    Wend IX > j8z[  
    ReDim Preserve in_flist(fCount-1) 1D#T+t`[  
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End Sub ^$g],PAY  

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