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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 T2<?4^xN  
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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 >-J%=P  
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。 ]CHO5'%,$  
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。 (8T36pt~  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 +yYxHIOZ(  
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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。 {9?++G"\  
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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) &U*MLf83`  
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 v~E\u  
例如下所示: U}f"a!  
Sample name:  EDF-C1-56 vge4&H3a&  
Merging data from file EDF-C1-56 0-0.txt |Y|6`9;  
Finished merging RPC data for sample EDF-C1-56 p>M8:,  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt +vf~s^  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 N"/J1   
a. 创建一个新的散射库 v7-z<'?s~  
b. 散射模型命名 .X1xpi%  
c. 改变散射模型为“Tabulated BSDF”. B:mtl?69g  
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 ) OVq(ulwi+  
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。 ZG(.Q:1  
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, e^!>W %.7Z  
g. 点击OK D[jPz0  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ,:[\h\5m  
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脚本代码 %Z~0vwY  
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'#Language "WWB-COM" ,"e n7  
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Option Explicit H8!; XB  
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Sub Main g9~QNA  
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    'Cleanup xaN[ru@  
    ClearOutputWindow() bU$f4J  
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    Print "Merging RPC Photonics BSDF Data Files" 1S{AGgls5  
    SetTextColor(255,0,0) O'rz  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." x@*RF:\}  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." }Y~<|vZ  
    SetTextColor(0,0,0) Q]1s*P  
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    'Current directory of this script (should be the same as the text files being merged) q2+`a;_S  
    Dim cDir As String tkIpeL[d  
    cDir = MacroDir$ & "\" j{$2.W$  
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    'Array which will be populated with the list of files to be merged R$m?aIN  
    Dim fList() As String, curFile As String ~J:qG9|]}  
    GetFileList( cDir, fList ) %/n#{;c#  
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    Print "" oUd R,;h9  
    Print "Files found for merging:" FZBdQhYF  
    For Each curFile In fList Ir6(EIwx0  
        Print Chr(9) & curFile Je*hyi7  
    Next c BcZ@e;  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ugV/#v O  
    Dim nameArray() As String, sampName As String [QDM_n  
    nameArray = Split(fList(0)," 0-0.txt") "}Oj N\  
    sampName  = nameArray(0) 7`J= PG$A  
    Print "" ){<qp  
    Print "Sample name: " & Chr(9) & sampName IY,n7x0d  
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    'Open an output file and write the FRED header data ^k2g60]  
    Dim outFile As String jPIOBEIG  
    outFile = cDir & sampName & "_FRED.txt" [R0E4A?M  
    Open outFile For Output As #1 ?s5/  
    Print #1, "type bsdf_data" 3f-J%!aH  
    Print #1, "format angles=deg bsdf=value scale=1" (zml704dI)  
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    'Loop the file list, skip the two header lines and write the remaining data to file m;cgX#k5  
    Dim lineArray() As String, curLine As Long OrY^?E  
    For Each curFile In fList o`M.v[O  
        Print "Merging data from file " & curFile dZkj|Ua~  
        ReadFile( cDir & curFile, lineArray ) duV\Kt/g^  
        For curLine = 2 To UBound(lineArray) bLSUF`-z  
            Print #1, lineArray(curLine) )|,Zp`2/  
        Next z P8rW5/  
    Next @/8O@^  
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    'Close the output file 6<o2 0(?  
    Close #1 G%MdZg&i  
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    Print "Finished merging RPC data for sample " & sampName AOM@~qyc   
    Print "FRED formatted data file: " & Chr(9) & outFile 6KE?@3;Om  
End Sub -\&b&;_  
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'Utility function to read the contents of a file into an array of strings. UT%?3}*u"  
Function ReadFile(ByVal fileName As String, _ B-oQjr-  
                  ByRef lineArray() As String) As Long o(stXa  
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    ReadFile = -1 D+xPd<  
    Dim oFSO As Object ;m~%57.;\  
    Set oFSO = CreateObject("Scripting.FileSystemObject") "R0(!3  
    Erase lineArray Zvkb=  
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    Dim fid As Long 2CRgOFR  
    If oFSO.fileexists( fileName ) Then GhR%fxe  
        fid = FreeFile() %\B@!4]  
        Open fileName For Input As fid ldWrv7. P  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 'MQJt2QU9{  
        Close fid /Jc54d  
    End If lnnT_[ni.  
    Set oFSO = Nothing /DX6Hkkj%  
    Return UBound( lineArray ) @n;$Edza/  
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End Function %I#[k4,N  
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Sub GetFileList( ByVal in_dir As String, _ tY- `$U@  
                 ByRef in_flist() As String ) :+Tvq,/"  
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    'Redimension the file list array )\+1*R|H}  
    Erase in_flist P;K <P  
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    'Tracks how many files are found J0 UF(  
    Dim fCount As Long H'?dsc  
    fCount = 0 LLPbZ9q  
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    'Recurse directory and search for text files P( 1Z  
    Dim f As String I` q"  
    f = Dir$(in_dir & "*.txt") QFU1l"(qGk  
    While f <> "" )|B3TjH C  
        ReDim Preserve in_flist(fCount) k? !'OHmBL  
        in_flist(fCount) = f mI,!8#  
        fCount += 1 K9c5HuGy  
        f = Dir$() yZY.B {  
    Wend -5GRit1q?  
    ReDim Preserve in_flist(fCount-1)  K2D, *w  
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End Sub @QAI 0ZY  
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