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infotek 2023-05-11 08:31

RPC Photonics扩散片BSDF

摘要 n;HHogA  
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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 js^ ,(CS  
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。 ;:S&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。 ] U@o0  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 CDj~;$[B  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 0oA{Jix  
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图2. RPC Photonics工程漫射体不同类型的散射数据
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 4PLk  
3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 l@j.hTO<  
例如下所示: 3H\w2V  
Sample name:  EDF-C1-56 +.B<Hd  
Merging data from file EDF-C1-56 0-0.txt @K223?c8l  
Finished merging RPC data for sample EDF-C1-56 cHA7Kg !  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt '[|+aJ  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 PupM/?57  
a. 创建一个新的散射库 h+.{2^x  
b. 散射模型命名 z2gk[zY&  
c. 改变散射模型为“Tabulated BSDF”. Th[f9H%  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) gyHHoZc3  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 %m,6}yt  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, }K1 0Po'  
g. 点击OK &K_)#v`|  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 mpC`Yk  
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脚本代码 oeSN9O  
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'#Language "WWB-COM" . JX EK  
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Option Explicit ]=rht9),"  
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Sub Main 'X).y1'  
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    'Cleanup M j-vgn&/  
    ClearOutputWindow() "]'?a$\ky:  
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    Print "Merging RPC Photonics BSDF Data Files" JTqDr  
    SetTextColor(255,0,0) OV2 -8ERS  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." #&<)! YY5  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." +h^jC9,m~{  
    SetTextColor(0,0,0) !IU.a90V  
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    'Current directory of this script (should be the same as the text files being merged) ~"pKe~h   
    Dim cDir As String 3K&4i'}V  
    cDir = MacroDir$ & "\" spU)]4P&  
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    'Array which will be populated with the list of files to be merged ^2d!*W|  
    Dim fList() As String, curFile As String lPH%Do>K  
    GetFileList( cDir, fList ) G)#$]diNuX  
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    Print "" Y^Nuz/  
    Print "Files found for merging:" J]W5[)L  
    For Each curFile In fList OJT1d-5p  
        Print Chr(9) & curFile  [=O/1T  
    Next nKR{ug>I)  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. i 8!zu!-0  
    Dim nameArray() As String, sampName As String (npj_s!.C)  
    nameArray = Split(fList(0)," 0-0.txt") j.a`N2]WE  
    sampName  = nameArray(0) kK 8itO  
    Print "" i'd2[A.7I  
    Print "Sample name: " & Chr(9) & sampName wIkN9 f  
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    'Open an output file and write the FRED header data AE: Z+rM*  
    Dim outFile As String G;> _<22  
    outFile = cDir & sampName & "_FRED.txt" $'W}aER  
    Open outFile For Output As #1 =_j vk.  
    Print #1, "type bsdf_data" l1ZY1#%j  
    Print #1, "format angles=deg bsdf=value scale=1" f>'Y(dJ'W  
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    'Loop the file list, skip the two header lines and write the remaining data to file |+  N5z  
    Dim lineArray() As String, curLine As Long Bwr3jV?S  
    For Each curFile In fList HW&%T7 a  
        Print "Merging data from file " & curFile  zYXV;  
        ReadFile( cDir & curFile, lineArray ) [dtbkQt,c  
        For curLine = 2 To UBound(lineArray) ?!qY,9lhH  
            Print #1, lineArray(curLine) R.7:3h  
        Next (F7(^.MG  
    Next /iG*)6*^k  
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    'Close the output file dEBcfya  
    Close #1 XdH\OJ  
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    Print "Finished merging RPC data for sample " & sampName ]weoTn:  
    Print "FRED formatted data file: " & Chr(9) & outFile tx?dIy;  
End Sub (&$VxuJ+6y  
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'Utility function to read the contents of a file into an array of strings. rD>*j~_+P  
Function ReadFile(ByVal fileName As String, _ @FdSFQ/9  
                  ByRef lineArray() As String) As Long *<1r3!  
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    ReadFile = -1 4k./(f2+  
    Dim oFSO As Object c8Z wr]DF  
    Set oFSO = CreateObject("Scripting.FileSystemObject") tabT0  
    Erase lineArray HF|oBX$_  
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    Dim fid As Long o1nURJ!  
    If oFSO.fileexists( fileName ) Then m%?V7-9!k  
        fid = FreeFile() X.`~>`8  
        Open fileName For Input As fid 8Lw B B  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) {Ay"bjZh  
        Close fid hY`\&@  
    End If phO;c;y}  
    Set oFSO = Nothing zbJT&@z  
    Return UBound( lineArray ) YBh'EL}P  
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End Function CdL< *AH  
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Sub GetFileList( ByVal in_dir As String, _ =B. F;4 0  
                 ByRef in_flist() As String ) \W,I?Kx$  
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    'Redimension the file list array  }-~l!  
    Erase in_flist ON+J>$[[  
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    'Tracks how many files are found a&vY!vx 3  
    Dim fCount As Long 86nN"!{l:  
    fCount = 0 BT}&Y6  
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    'Recurse directory and search for text files s(W|f|R  
    Dim f As String (5\N B0  
    f = Dir$(in_dir & "*.txt") Z0l+1iMx  
    While f <> "" 37}D9:#5C  
        ReDim Preserve in_flist(fCount) ?7{H|sI  
        in_flist(fCount) = f 4j)tfhwd8  
        fCount += 1 ToYAW,U[d  
        f = Dir$() 1^gl}^|B  
    Wend Bj7gQ%>H4  
    ReDim Preserve in_flist(fCount-1) %D *OO{  
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End Sub _YRE (YZ/  
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