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infotek 2023-05-11 08:31

RPC Photonics扩散片BSDF

摘要 q6C`hVM l  
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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 l:UKU!  
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。 n~|?)EL  
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。 <iU@ M31  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 xlwf @XW  
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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。 nf"#F@dk  
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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) a<r,LE  
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 s<!G2~T  
例如下所示: >(igVaZ>  
Sample name:  EDF-C1-56 `j)56bR  
Merging data from file EDF-C1-56 0-0.txt @XzfuuE]  
Finished merging RPC data for sample EDF-C1-56 J.4U;A5  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Nr>UZlU8  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ]3I a>i  
a. 创建一个新的散射库 %?gG-R  
b. 散射模型命名 Tt~[hC h  
c. 改变散射模型为“Tabulated BSDF”. SIrNZ^I  
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 ) E:**gvfq  
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。 rY^uOrR>j*  
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, Z@Q*An  
g. 点击OK _h}(j Ed!  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 T&pCLvkz  
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脚本代码 ^"?a)KC  
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'#Language "WWB-COM" L$OZ]  
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Option Explicit ]i`Q+q[  
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Sub Main TU~y;:OJ  
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    'Cleanup zi6J|u  
    ClearOutputWindow() v0 :n:q  
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    Print "Merging RPC Photonics BSDF Data Files" dR\yRC]I  
    SetTextColor(255,0,0) ~%>i lWaHB  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." _%2ukuJ `  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." >KrI}>!9r  
    SetTextColor(0,0,0) |wuTw|  
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    'Current directory of this script (should be the same as the text files being merged) lF/ Xs  
    Dim cDir As String 5O]tkHYR  
    cDir = MacroDir$ & "\" t.;._'  
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    'Array which will be populated with the list of files to be merged F6yFKNK!n  
    Dim fList() As String, curFile As String 7_s+7x =  
    GetFileList( cDir, fList ) &&C70+_po  
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    Print "" r4iNX+h?V  
    Print "Files found for merging:" i3|xdYe$  
    For Each curFile In fList ]h`*w  
        Print Chr(9) & curFile ]FVJQS2h  
    Next klQmo30i  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. tb~E.Lm\  
    Dim nameArray() As String, sampName As String KM[0aXOtv  
    nameArray = Split(fList(0)," 0-0.txt") |-S!)iG1V  
    sampName  = nameArray(0) _w?!Mu  
    Print "" w"[T  
    Print "Sample name: " & Chr(9) & sampName QjSWl,{ $D  
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    'Open an output file and write the FRED header data 7M~/ q.  
    Dim outFile As String MFa/%O_*  
    outFile = cDir & sampName & "_FRED.txt" )Hin{~h  
    Open outFile For Output As #1 ~3gazTe9  
    Print #1, "type bsdf_data" D )`(b  
    Print #1, "format angles=deg bsdf=value scale=1" nm<VcCc  
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    'Loop the file list, skip the two header lines and write the remaining data to file FvVC 2Z  
    Dim lineArray() As String, curLine As Long r?[[.zm"7  
    For Each curFile In fList [Y*>x2X  
        Print "Merging data from file " & curFile hq {{XQ  
        ReadFile( cDir & curFile, lineArray ) 9rz$c, Y(  
        For curLine = 2 To UBound(lineArray) $dI mA  
            Print #1, lineArray(curLine) n!Y_SPg   
        Next +zche  
    Next Wm-$l  
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    'Close the output file #3_g8ni5X  
    Close #1 EQ^]W-gN  
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    Print "Finished merging RPC data for sample " & sampName iupkb  
    Print "FRED formatted data file: " & Chr(9) & outFile !Q~>)$Cf^  
End Sub w]qM  
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'Utility function to read the contents of a file into an array of strings. O6?{@l  
Function ReadFile(ByVal fileName As String, _ ^(+q 1O'  
                  ByRef lineArray() As String) As Long VS ECD;u4c  
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    ReadFile = -1 +jF |8  
    Dim oFSO As Object S[$9_Jf  
    Set oFSO = CreateObject("Scripting.FileSystemObject") B6&[_cht  
    Erase lineArray -7w}+iS  
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    Dim fid As Long Jy}~ZY  
    If oFSO.fileexists( fileName ) Then R2~y<^.V`Y  
        fid = FreeFile() 4t =Kt  
        Open fileName For Input As fid "Ua-7Q&A  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) xa'U_]m  
        Close fid 3,v/zcV  
    End If `T+>E0H(f  
    Set oFSO = Nothing xV+\R/)x  
    Return UBound( lineArray ) ?/MkH0[G=  
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End Function *LBF+L^C%  
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Sub GetFileList( ByVal in_dir As String, _ /2T  W?a  
                 ByRef in_flist() As String ) W^^0Rh_  
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    'Redimension the file list array v7@"9Uw}  
    Erase in_flist ^kcuRJ0*$  
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    'Tracks how many files are found -:d{x#  
    Dim fCount As Long ec#`9w$  
    fCount = 0 SbX^DAlB1  
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    'Recurse directory and search for text files Z ;~%!  
    Dim f As String 8wd["hga<%  
    f = Dir$(in_dir & "*.txt") B0yGr\KJ  
    While f <> "" _z%\53h  
        ReDim Preserve in_flist(fCount) g&p(XuN  
        in_flist(fCount) = f <HJLs+C  
        fCount += 1 ;8vB7|54.  
        f = Dir$() "Y^Fn,c  
    Wend \ CcVk"/  
    ReDim Preserve in_flist(fCount-1) )Rb t0   
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End Sub 1r.2bL*~jw  
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