[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： dzRnI*  
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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。 =_=0l+\}  
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背景： s^R$u"pFs  
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。 m>{I>:sq  
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。 9cXL4  
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步骤 u/.# zn@9h  
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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。 U9Gg#M4tY  
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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[Ko>  
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 <El!,UBq<  
例如下所示： oEJxey]B7  
Sample name:  EDF-C1-56 6ee1^>  
Merging data from file EDF-C1-56 0-0.txt UXPF"}S2
 
Finished merging RPC data for sample EDF-C1-56 t3<HE_B|  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt j*_>/g
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4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 f#&@Vl(i&  
a. 创建一个新的散射库 hH]oJ}H \  
b. 散射模型命名 Fgw$;W  
c. 改变散射模型为“Tabulated BSDF”. 3U9leY'2N  
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 ） sB=s .`9  
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。 /}Ct2w&<k  
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， MZ%S3'  
g. 点击OK zEk/#&  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 $VJE&b  
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脚本代码： j)mi~i*U  
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'#Language "WWB-COM" p?#xd!tc2N  
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Option Explicit M
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Sub Main ')Qb,#/,%  
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    'Cleanup asJt6C  
    ClearOutputWindow() GXwQ )P5]  
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    Print "Merging RPC Photonics BSDF Data Files" fiQ/ &]|5  
    SetTextColor(255,0,0) $%zM Z  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 2#Y5*r's\  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." X<uH [  
    SetTextColor(0,0,0) .#_g.0<  
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    'Current directory of this script (should be the same as the text files being merged) 8nTdZu  
    Dim cDir As String ]//Dd/L6  
    cDir = MacroDir$ & "\" =`t%p1   
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    'Array which will be populated with the list of files to be merged jF6[+bW<  
    Dim fList() As String, curFile As String n:[LsbTk  
    GetFileList( cDir, fList ) @O| lA  
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    Print "" vqRW^>~-B  
    Print "Files found for merging:" Mo&Po9  
    For Each curFile In fList $Hal]  
        Print Chr(9) & curFile f/pr  
    Next \SA$:^zO  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. q&@q/9kz  
    Dim nameArray() As String, sampName As String %5/h;4   
    nameArray = Split(fList(0)," 0-0.txt") ol@LLT_m  
    sampName  = nameArray(0) o%l|16DR  
    Print "" '+iqbcUd,  
    Print "Sample name: " & Chr(9) & sampName
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    'Open an output file and write the FRED header data j6&7tK,  
    Dim outFile As String QO3QR/Ww  
    outFile = cDir & sampName & "_FRED.txt" jHpFl4VPz  
    Open outFile For Output As #1 q6zKyO
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    Print #1, "type bsdf_data" qj<_*  
    Print #1, "format angles=deg bsdf=value scale=1" 0BQ<a  
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    'Loop the file list, skip the two header lines and write the remaining data to file H:`
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    Dim lineArray() As String, curLine As Long vDVE#Nm_  
    For Each curFile In fList `YPNVm<3)  
        Print "Merging data from file " & curFile 
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        ReadFile( cDir & curFile, lineArray ) 'fIirGOl  
        For curLine = 2 To UBound(lineArray) &&($LnyA]  
            Print #1, lineArray(curLine) j~`rc2n%  
        Next \bumB<w(]  
    Next
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    'Close the output file {9YNv<3  
    Close #1 5:~BGK&{Y  
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    Print "Finished merging RPC data for sample " & sampName ?o.Q  
    Print "FRED formatted data file: " & Chr(9) & outFile Zn"1qLPF  
End Sub /]"2;e-s+  
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'Utility function to read the contents of a file into an array of strings. L\y>WR%s  
Function ReadFile(ByVal fileName As String, _ t"]~e"  
                  ByRef lineArray() As String) As Long nh+f,HtSt  
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    ReadFile = -1 4O'X+dv^I  
    Dim oFSO As Object w65D;9/;  
    Set oFSO = CreateObject("Scripting.FileSystemObject") M}BqSzd*  
    Erase lineArray #F!'B|n  
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    Dim fid As Long y}!}*Qj+/  
    If oFSO.fileexists( fileName ) Then '}$$o1R  
        fid = FreeFile() >6"u{Qmr  
        Open fileName For Input As fid *WpDavovyB  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) J,j!  
        Close fid I:G4i}mA  
    End If h?ZxS  
    Set oFSO = Nothing 3erGTa[|q  
    Return UBound( lineArray ) q+Cq&|4 ?2  
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End Function sy;_%,}N  
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Sub GetFileList( ByVal in_dir As String, _ V_Oj?MMpn  
                 ByRef in_flist() As String ) fG*366W  
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    'Redimension the file list array MUfhk)"  
    Erase in_flist BR [3i}Ud  
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    'Tracks how many files are found CDTM<0`%  
    Dim fCount As Long ET 2@dY~  
    fCount = 0 /vLdm-4  
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    'Recurse directory and search for text files a@&P\"k  
    Dim f As String d~U}IMj  
    f = Dir$(in_dir & "*.txt") zwa%$U  
    While f <> "" $D)Ajd;  
        ReDim Preserve in_flist(fCount) v8!Ts"  
        in_flist(fCount) = f `gFE/i18  
        fCount += 1 EFNi# D8s  
        f = Dir$() -%eBip,'yl  
    Wend <|MF\D'  
    ReDim Preserve in_flist(fCount-1) cq,0?2R`t  
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End Sub mjtmN0^SR