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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

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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。
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背景 :#2Bw]z&z  
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。 mrTlXXz  
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。 ,/[6e\0~  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 tzZ63@cm  
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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。 2<li7c59  
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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) 4f@o mAM  
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 -8'C\R|J+  
例如下所示: Y_}mYvJW  
Sample name:  EDF-C1-56 U93}-){m  
Merging data from file EDF-C1-56 0-0.txt |]QqXE-7  
Finished merging RPC data for sample EDF-C1-56 $Vsk Ew"|M  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt '"y|p+=j:  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 X7[^s $VK  
a. 创建一个新的散射库 "~E[)^ANxD  
b. 散射模型命名 S2n39 3  
c. 改变散射模型为“Tabulated BSDF”. .id)VF-l  
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 ) ;V^ 112|C  
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。 ~SQ?BoCI[  
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, Ny_lrfh)[  
g. 点击OK l6(-I Tb  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 O#&c6MDB:  
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脚本代码 MzPzqm<  
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'#Language "WWB-COM" b k|m4|  
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Option Explicit x2@U.r"zo  
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Sub Main wpN k+;  
} $uxJB  
    'Cleanup 3:5 &Aa!  
    ClearOutputWindow() ?aC'.jH+  
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    Print "Merging RPC Photonics BSDF Data Files" |nbf'  
    SetTextColor(255,0,0) qZ]pq2G  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 1h>yu3O  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." .udv"?!z  
    SetTextColor(0,0,0) Q s.pGi0W  
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    'Current directory of this script (should be the same as the text files being merged) SaC d0. h  
    Dim cDir As String qud\K+  
    cDir = MacroDir$ & "\" Bt1p'g(V|  
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    'Array which will be populated with the list of files to be merged wtmB+:I  
    Dim fList() As String, curFile As String KQ `qpX^d  
    GetFileList( cDir, fList ) \(VTt|}By$  
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    Print "" 4VHqBQ4  
    Print "Files found for merging:" 76wc,+  
    For Each curFile In fList hj  
        Print Chr(9) & curFile o[v\|Q`d  
    Next $KUo s+%  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. rm4.aO~-F  
    Dim nameArray() As String, sampName As String N-jTc?mT~&  
    nameArray = Split(fList(0)," 0-0.txt") $"dR SysB  
    sampName  = nameArray(0) !l|5z G  
    Print "" z^_*&  
    Print "Sample name: " & Chr(9) & sampName @S|jC2^+h  
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    'Open an output file and write the FRED header data a\IP12F?  
    Dim outFile As String uum;q-"  
    outFile = cDir & sampName & "_FRED.txt" lrWV#`6!+  
    Open outFile For Output As #1 @+'-ADX  
    Print #1, "type bsdf_data" QYa(N[~a  
    Print #1, "format angles=deg bsdf=value scale=1" O=v#{ [  
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    'Loop the file list, skip the two header lines and write the remaining data to file [01.\eh  
    Dim lineArray() As String, curLine As Long c~{9a_G  
    For Each curFile In fList YX=2jI  
        Print "Merging data from file " & curFile {88gW\GL  
        ReadFile( cDir & curFile, lineArray ) JoRT&rkd  
        For curLine = 2 To UBound(lineArray) T21ky>8E  
            Print #1, lineArray(curLine) HS{(v;  
        Next AZzuI*  
    Next 2-=\~<)  
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    'Close the output file CM<]ZG7  
    Close #1 b !%hH  
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    Print "Finished merging RPC data for sample " & sampName 4|mD*o  
    Print "FRED formatted data file: " & Chr(9) & outFile < 'f dkW  
End Sub qOSg!aft{Q  
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'Utility function to read the contents of a file into an array of strings. !(n4|Wd  
Function ReadFile(ByVal fileName As String, _ q(zJ%Gv)  
                  ByRef lineArray() As String) As Long "Fy7K#n  
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    ReadFile = -1 uch>AuF:  
    Dim oFSO As Object "t({D   
    Set oFSO = CreateObject("Scripting.FileSystemObject") ZunCKc  
    Erase lineArray A a= u+  
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    Dim fid As Long 7_.11$E=H  
    If oFSO.fileexists( fileName ) Then yz-,)GB6  
        fid = FreeFile() {NPuu?&  
        Open fileName For Input As fid Cw~RJ^a_  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) p. R2gl1m  
        Close fid 2$14q$eb  
    End If #l4)HV  
    Set oFSO = Nothing #'-Sh7ycW  
    Return UBound( lineArray ) L lw&& K  
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End Function %.<H=!$  
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Sub GetFileList( ByVal in_dir As String, _ HJ2*y|u  
                 ByRef in_flist() As String ) rQOWLg!"  
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    'Redimension the file list array -pU|hSW*b  
    Erase in_flist n:0}utU4  
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    'Tracks how many files are found DNR~_3Aq  
    Dim fCount As Long kdxz!  
    fCount = 0 6ns! ~g@  
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    'Recurse directory and search for text files -*~CV:2iq-  
    Dim f As String 9U {y1}  
    f = Dir$(in_dir & "*.txt") RP 2_l$  
    While f <> "" 9prU+9  
        ReDim Preserve in_flist(fCount) Ja]?&j  
        in_flist(fCount) = f 'qArf   
        fCount += 1 Io|X#\K  
        f = Dir$() 6 4D]Ypx  
    Wend W(25TbQ  
    ReDim Preserve in_flist(fCount-1) u>Rb ?`  
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End Sub /Y&02L%\3s  
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