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infotek 2021-10-26 09:58

RPC Photonics扩散片BSDF

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RPC Photonics扩散片BSDF
时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印
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摘要 &xYO6_.  
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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。 x [_SNX"  
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背景 1z5Oi u  
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。 # zbAA<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。
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 T{:~v+I=  
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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。 e>] gCa  
图2. RPC Photonics工程漫射体不同类型的散射数据
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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) 9-3, DxZ}  
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 (E{}iq@2  
例如下所示: y2{uEbA  
Sample name:  EDF-C1-56 ?-Zl(uX  
Merging data from file EDF-C1-56 0-0.txt LpYG!Kl  
Finished merging RPC data for sample EDF-C1-56 BH"OphE  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt $&~moAl  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 !Soz??~o/  
b. 散射模型命名 6|G&d>G$_  
c. 改变散射模型为“Tabulated BSDF”. Db`SNk=  
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 ) 4Y5lP00!}  
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。 |W#(+m  
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, j"F?^0aR,Q  
g. 点击OK v6 C$Y+5~  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 1)o6jGQ  
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脚本代码 S6CI+W  
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'#Language "WWB-COM" K2> CR$L  
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Option Explicit _1,hO?TK  
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Sub Main bQ3txuha  
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    'Cleanup C<Z{G%Qm  
    ClearOutputWindow() lHUd<kEC  
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    Print "Merging RPC Photonics BSDF Data Files" QdrZi.qKH  
    SetTextColor(255,0,0) .0Kc|b=w  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." XkPE%m_5D  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." :N^+!,i  
    SetTextColor(0,0,0) |z7V1xF  
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    'Current directory of this script (should be the same as the text files being merged) Vak\N)=u  
    Dim cDir As String \(A A|;  
    cDir = MacroDir$ & "\" $<QrV,T  
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    'Array which will be populated with the list of files to be merged F )Iz:  
    Dim fList() As String, curFile As String [=BccT:b  
    GetFileList( cDir, fList ) o(k{Ed  
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    Print "" Zz1nXUZ  
    Print "Files found for merging:" ]9N&I/-  
    For Each curFile In fList jF}-dfe  
        Print Chr(9) & curFile Y b=77(Q V  
    Next iInWw"VbKe  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. e }Mf  
    Dim nameArray() As String, sampName As String N; '] &f  
    nameArray = Split(fList(0)," 0-0.txt") p|C[T]J\@  
    sampName  = nameArray(0)  k^Q.lb {  
    Print ""  l*?_@  
    Print "Sample name: " & Chr(9) & sampName ]"&](e6*  
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    'Open an output file and write the FRED header data -.Blj<2ah  
    Dim outFile As String B[I9<4}  
    outFile = cDir & sampName & "_FRED.txt" )n]" ~I^  
    Open outFile For Output As #1 >%ovL8F  
    Print #1, "type bsdf_data" [l3ys  
    Print #1, "format angles=deg bsdf=value scale=1" v\[+  
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    'Loop the file list, skip the two header lines and write the remaining data to file XEnu0 gr  
    Dim lineArray() As String, curLine As Long a%A!Dz S  
    For Each curFile In fList MkL)  
        Print "Merging data from file " & curFile 1uO2I&B  
        ReadFile( cDir & curFile, lineArray ) ! ,bQ;p3g|  
        For curLine = 2 To UBound(lineArray) ftG3!}  
            Print #1, lineArray(curLine) _jc_(;KPF  
        Next au04F]-|j8  
    Next e P,bFc  
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    'Close the output file xeL"FzF:V  
    Close #1 \{}dn,?Fv  
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    Print "Finished merging RPC data for sample " & sampName RC/45:hZZ  
    Print "FRED formatted data file: " & Chr(9) & outFile _6Y+E"@zs  
End Sub 'Oj 1@0*0  
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'Utility function to read the contents of a file into an array of strings. cGiL9|k  
Function ReadFile(ByVal fileName As String, _ [ /YuI@C,@  
                  ByRef lineArray() As String) As Long xorafL  
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    ReadFile = -1 `sCn4-$8  
    Dim oFSO As Object FJDE48Vi  
    Set oFSO = CreateObject("Scripting.FileSystemObject") n m<?oI*\  
    Erase lineArray BZ =I/L  
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    Dim fid As Long ~ney~Pz_  
    If oFSO.fileexists( fileName ) Then d\ 8v VZ  
        fid = FreeFile() &iInru3  
        Open fileName For Input As fid #R{>@]x`  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 59O-"Sc[  
        Close fid *I)J%#  
    End If ~N/r;omVc  
    Set oFSO = Nothing O5:bdt.  
    Return UBound( lineArray ) %rMCiz  
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End Function ICb!AsL  
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Sub GetFileList( ByVal in_dir As String, _  v&|65[<  
                 ByRef in_flist() As String ) 8ix_<$%  
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    'Redimension the file list array ~%8P0AP  
    Erase in_flist P&uSh?[ ^  
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    'Tracks how many files are found N^dQX,j  
    Dim fCount As Long !JDr58  
    fCount = 0 iCPm7AU  
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    'Recurse directory and search for text files Vw1>d+<~-)  
    Dim f As String %(1O jfZc  
    f = Dir$(in_dir & "*.txt") )Cl>%9  
    While f <> "" O|V0WiY<  
        ReDim Preserve in_flist(fCount) _Xt/U>N  
        in_flist(fCount) = f $G-<kC}8:  
        fCount += 1 >!t3~q1Cn  
        f = Dir$() dMH_:jb  
    Wend |gA@WV-%  
    ReDim Preserve in_flist(fCount-1)

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