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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 U>tR:)  
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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。 d4o ^+\  
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背景 !h? HfpYv  
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。 eV7;#w<]  
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 1UP {j`-K|  
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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。 HT<p=o'$Z  
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) - 2)k!5X=  
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 |5u~L#P  
例如下所示: !*]i3 ,{7v  
Sample name:  EDF-C1-56 99yWUC,  
Merging data from file EDF-C1-56 0-0.txt 2"&GH1  
Finished merging RPC data for sample EDF-C1-56 Yxq!7J  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt s;A7:_z#7  
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 Sk{skvd;  
b. 散射模型命名 `v -[&  
c. 改变散射模型为“Tabulated BSDF”. zPnb_[YF  
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 ) qU26i"GHp  
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。 4t*%(  
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, L<FXtBJ  
g. 点击OK $+j1^  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "B'c;0 @q  
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脚本代码 IiE6i43  
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'#Language "WWB-COM" E2DfG^sGV  
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Option Explicit UZ<K'H,q  
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Sub Main gnJ8tuS  
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    'Cleanup Jc":zR@5  
    ClearOutputWindow() @gN"Q\;F  
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    Print "Merging RPC Photonics BSDF Data Files" Q6m8N  
    SetTextColor(255,0,0) :M(uP e=D  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ?R]`M_^&u!  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." G&S2U=KdV%  
    SetTextColor(0,0,0) Wt/;iq"  
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    'Current directory of this script (should be the same as the text files being merged) 44KoOY_  
    Dim cDir As String - l X4;  
    cDir = MacroDir$ & "\" 4Y(@ KUb  
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    'Array which will be populated with the list of files to be merged 6R45+<.  
    Dim fList() As String, curFile As String 5x+]uABE  
    GetFileList( cDir, fList ) h0<PQZJ  
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    Print "" MtkU]XKGT  
    Print "Files found for merging:" R;DU68R  
    For Each curFile In fList =}Tm8b0  
        Print Chr(9) & curFile ;<Q%d~$xy}  
    Next 1(DiV#epG  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. \Kf\%Q  
    Dim nameArray() As String, sampName As String *}\M!u{J  
    nameArray = Split(fList(0)," 0-0.txt") %u!=<yn'  
    sampName  = nameArray(0) ET.jjV  
    Print "" 6x^$W ]R  
    Print "Sample name: " & Chr(9) & sampName +gd5&  
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    'Open an output file and write the FRED header data gGM fy]]R  
    Dim outFile As String z>W:+W"o  
    outFile = cDir & sampName & "_FRED.txt" g-qXS]y7  
    Open outFile For Output As #1 *73gp  
    Print #1, "type bsdf_data" -leX|U}k  
    Print #1, "format angles=deg bsdf=value scale=1" c|/HX%Y  
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    'Loop the file list, skip the two header lines and write the remaining data to file )R7Sh51P  
    Dim lineArray() As String, curLine As Long BAQ-1kSz  
    For Each curFile In fList 3y)\dln  
        Print "Merging data from file " & curFile .I:rb~ &  
        ReadFile( cDir & curFile, lineArray ) %mC@}  
        For curLine = 2 To UBound(lineArray) k|-\[Yl.  
            Print #1, lineArray(curLine) #Ha:O,|  
        Next 7I;kh`H$(f  
    Next 8n3]AOc'~-  
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    'Close the output file mGE!,!s}  
    Close #1 x)C}  
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    Print "Finished merging RPC data for sample " & sampName kG D_w  
    Print "FRED formatted data file: " & Chr(9) & outFile {JfQQP&FV  
End Sub [oh06_rB  
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'Utility function to read the contents of a file into an array of strings. yV.p=8:  
Function ReadFile(ByVal fileName As String, _ h~>1 -T8  
                  ByRef lineArray() As String) As Long MtJ-pa~n  
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    ReadFile = -1 EL~$7 J  
    Dim oFSO As Object }r,M (Zr  
    Set oFSO = CreateObject("Scripting.FileSystemObject") l\Ozy  
    Erase lineArray ( eKgc  
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    Dim fid As Long rMwa6ZO'm;  
    If oFSO.fileexists( fileName ) Then ]q"&V\b  
        fid = FreeFile() [-\Y?3  
        Open fileName For Input As fid 4o#]hB';ni  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) k3bQ32()  
        Close fid WX4sTxJK  
    End If k'iiRRM  
    Set oFSO = Nothing #}#m\=0  
    Return UBound( lineArray ) b/_Zw^DPC  
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End Function JwMRquQv  
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Sub GetFileList( ByVal in_dir As String, _ GDLi ?3q  
                 ByRef in_flist() As String ) O=A R`r#u  
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    'Redimension the file list array U =J5lo  
    Erase in_flist ZuGSRGX'  
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    'Tracks how many files are found G`l\R:Q  
    Dim fCount As Long _s;y0$O  
    fCount = 0 Rs=Fcvl  
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    'Recurse directory and search for text files e=9/3?El  
    Dim f As String =%|`gZ  
    f = Dir$(in_dir & "*.txt") i~Tt\UA>  
    While f <> "" OH@"]Nc~  
        ReDim Preserve in_flist(fCount) ?d%)R*3IX  
        in_flist(fCount) = f &6\&McmkX  
        fCount += 1 Lc~m`=B  
        f = Dir$() W|2^yO,dX  
    Wend *fm?"0M5  
    ReDim Preserve in_flist(fCount-1)

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