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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 &,p6lbP  
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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 R3_;!/1  
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。 MTE 1\,  
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。 LQ Ux}  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 Z[z" v  
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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。 w(+ L&IBC  
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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) ; 1?L  
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 vfc5M6Vm)<  
例如下所示: [=. iJ5,{2  
Sample name:  EDF-C1-56 lv.h?"Ml  
Merging data from file EDF-C1-56 0-0.txt p|0SA=?k"  
Finished merging RPC data for sample EDF-C1-56 $i8oLSRV  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt P&c O2  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 HWou&<EK  
a. 创建一个新的散射库 I`@>v%0  
b. 散射模型命名 ):=8w.yC  
c. 改变散射模型为“Tabulated BSDF”. s&WE'  
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 ) x`wUi*G  
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。 OHngpe4  
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, {KTZSs $n  
g. 点击OK A;/,</  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 =VWH8w.3  
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脚本代码 XI ><;#  
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'#Language "WWB-COM" %AT/g&M&1#  
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Option Explicit -DZ5nx  
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Sub Main 8*VQw?{Uee  
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    'Cleanup V+})$m*>  
    ClearOutputWindow() 54]UfmT%I  
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    Print "Merging RPC Photonics BSDF Data Files" rP(;^8l"  
    SetTextColor(255,0,0) JGhK8E  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." s/;S2l$`  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Yv{$XI7  
    SetTextColor(0,0,0) |D;I>O^"R  
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    'Current directory of this script (should be the same as the text files being merged) 0eA |Uq~  
    Dim cDir As String ZS&+<kGD  
    cDir = MacroDir$ & "\" C1YH\ X(r  
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    'Array which will be populated with the list of files to be merged >n&+<06  
    Dim fList() As String, curFile As String Q`=d5Uvw  
    GetFileList( cDir, fList ) k1D|Cpnp  
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    Print "" 8X\":l:  
    Print "Files found for merging:" R C!~eJG!  
    For Each curFile In fList '2p,0Bk9i  
        Print Chr(9) & curFile ( ~>-6Nb 5  
    Next 5S! !@P!,  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 5cr\ JR  
    Dim nameArray() As String, sampName As String &x4|!" G  
    nameArray = Split(fList(0)," 0-0.txt") =@;\9j  
    sampName  = nameArray(0) }f6_ 7W%5  
    Print "" [GW;RjPE  
    Print "Sample name: " & Chr(9) & sampName Og2w] B[  
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    'Open an output file and write the FRED header data 99Nm?$ g  
    Dim outFile As String ]PH'G>x  
    outFile = cDir & sampName & "_FRED.txt" ge&!GO  
    Open outFile For Output As #1 oHethk  
    Print #1, "type bsdf_data" CY@#_z  
    Print #1, "format angles=deg bsdf=value scale=1" Is  ( Ji  
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    'Loop the file list, skip the two header lines and write the remaining data to file al]-*=v7}  
    Dim lineArray() As String, curLine As Long 9iK%@k  
    For Each curFile In fList V9D>Xh!0H  
        Print "Merging data from file " & curFile [@$t35t~  
        ReadFile( cDir & curFile, lineArray )  OJ# d  
        For curLine = 2 To UBound(lineArray) ~N+H7T.L  
            Print #1, lineArray(curLine) ZlL]AD@  
        Next Z~g7^,-t  
    Next ?$H=n{iW  
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    'Close the output file p<(b^{EX  
    Close #1 8/ CK(G  
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    Print "Finished merging RPC data for sample " & sampName gCI{g. [I!  
    Print "FRED formatted data file: " & Chr(9) & outFile h`MTB!o  
End Sub ]6?6 k4@  
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'Utility function to read the contents of a file into an array of strings. ";w"dfC^  
Function ReadFile(ByVal fileName As String, _ |)YN"nqg  
                  ByRef lineArray() As String) As Long Zx%6pZ(.  
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    ReadFile = -1 =zwn3L8fL  
    Dim oFSO As Object TDW\n  
    Set oFSO = CreateObject("Scripting.FileSystemObject")  bR83N  
    Erase lineArray AbOF/ g)C  
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    Dim fid As Long ks(BS k4  
    If oFSO.fileexists( fileName ) Then {} Zqaf  
        fid = FreeFile() y-a3  
        Open fileName For Input As fid .arWbTR)~U  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) r[KX"U-  
        Close fid B5/"2i  
    End If $x q$  
    Set oFSO = Nothing IFW"S fdZk  
    Return UBound( lineArray ) ]9$^=z%SE  
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End Function /9@ VnM  
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Sub GetFileList( ByVal in_dir As String, _ 5P![fX|5  
                 ByRef in_flist() As String ) 63pd W/\j  
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    'Redimension the file list array @*5(KIeeC>  
    Erase in_flist e#|YROHf  
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    'Tracks how many files are found )&.Zxo;q=  
    Dim fCount As Long tE;c>=>t  
    fCount = 0 Na$[nv8qh  
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    'Recurse directory and search for text files [ih^VlZ  
    Dim f As String V%[34G  
    f = Dir$(in_dir & "*.txt") f2Z(hYH~  
    While f <> "" }\aJ%9X02  
        ReDim Preserve in_flist(fCount) zEs:OOM  
        in_flist(fCount) = f k[5:]5lp+  
        fCount += 1 &O^t]7  
        f = Dir$() )EIT>u=  
    Wend c4(og|ifk  
    ReDim Preserve in_flist(fCount-1) _.^`DP >  
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End Sub tk!5"`9N  
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