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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 #Y'ewu;qJ  
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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 H-mQ{K^  
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。 w+a5/i@  
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。 ElKMd  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 >E3-/)Ti  
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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。 _7~q|  
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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) ]dgi]R|`  
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 #qv!1$}2  
例如下所示: Uyxn+j 5  
Sample name:  EDF-C1-56 ?Ezy0>j  
Merging data from file EDF-C1-56 0-0.txt +O^}  t  
Finished merging RPC data for sample EDF-C1-56 AQ,"):ofvT  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt C_yNSD  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 8dC RSU  
a. 创建一个新的散射库 t+\<i8  
b. 散射模型命名 A4Q{(z-?  
c. 改变散射模型为“Tabulated BSDF”. YFW/ Fa\7  
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 ) uc}F|O   
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。 )0g!lCfb  
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, y>7 r;e  
g. 点击OK :jC$$oC].  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 .zTkOk L  
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脚本代码 &3 Ki  
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'#Language "WWB-COM" T(Bcp^N  
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Option Explicit /1$u|Gs *  
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Sub Main >V4r '9I  
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    'Cleanup ;mC|> wSZ  
    ClearOutputWindow() 9+/D\|"{  
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    Print "Merging RPC Photonics BSDF Data Files" #lMC#Ld  
    SetTextColor(255,0,0) &N]e pV>  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." sB$ "mJ  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." mn*}U R  
    SetTextColor(0,0,0) 4wGBB{X  
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    'Current directory of this script (should be the same as the text files being merged) e+:X%a4\  
    Dim cDir As String  wG6Oz2(  
    cDir = MacroDir$ & "\" |_QpB?b  
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    'Array which will be populated with the list of files to be merged *ae)<l3v  
    Dim fList() As String, curFile As String Z^=(9 :  
    GetFileList( cDir, fList ) ~*]7f%L-  
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    Print "" IO ]tO[P#  
    Print "Files found for merging:" `^ a:1^  
    For Each curFile In fList #p]V?  
        Print Chr(9) & curFile )>U"WZ'<  
    Next Q7{{r&|t&  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. (`4&Y-  
    Dim nameArray() As String, sampName As String E7hs+Mh  
    nameArray = Split(fList(0)," 0-0.txt") >AY9 F|:  
    sampName  = nameArray(0) hwQ|'^(@O  
    Print "" "5'eiYm s  
    Print "Sample name: " & Chr(9) & sampName %d40us8E  
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    'Open an output file and write the FRED header data 2J%L%6z8~  
    Dim outFile As String X.FoX  
    outFile = cDir & sampName & "_FRED.txt" c5:0`~5Fn  
    Open outFile For Output As #1 8~~ k?  
    Print #1, "type bsdf_data" Sw$/Z)1K&  
    Print #1, "format angles=deg bsdf=value scale=1" +$xw0)|  
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    'Loop the file list, skip the two header lines and write the remaining data to file AK%&Kq&PaY  
    Dim lineArray() As String, curLine As Long ~ 4Mz:h^  
    For Each curFile In fList 2X*n93AQi  
        Print "Merging data from file " & curFile 'o*\ N%  
        ReadFile( cDir & curFile, lineArray ) j]` hy"  
        For curLine = 2 To UBound(lineArray) bv7xh*/  
            Print #1, lineArray(curLine) qn{4AWmJ  
        Next 9j5|o([J  
    Next ?^MH:o  
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    'Close the output file Qh6 vH9(D  
    Close #1 O1\25D  
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    Print "Finished merging RPC data for sample " & sampName ;l<Hen*  
    Print "FRED formatted data file: " & Chr(9) & outFile 0pl'*r*9  
End Sub %e)vl[:}  
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'Utility function to read the contents of a file into an array of strings. kmo#jITa`  
Function ReadFile(ByVal fileName As String, _ (Q ^=^s|  
                  ByRef lineArray() As String) As Long 2V$Jn8v,`{  
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    ReadFile = -1 Io>U-Zd\>  
    Dim oFSO As Object ^k{/Yl  
    Set oFSO = CreateObject("Scripting.FileSystemObject") +lZ-xU1  
    Erase lineArray ,,6lQ]wG  
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    Dim fid As Long 1vCp<D9<  
    If oFSO.fileexists( fileName ) Then RBg2iG$ 8|  
        fid = FreeFile() * CAz_s<  
        Open fileName For Input As fid R/Sm  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 'J!Gip ,  
        Close fid nD)SR  
    End If e6qIC*C!  
    Set oFSO = Nothing N~or.i&a  
    Return UBound( lineArray ) w^n&S=E E~  
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End Function (^sb('"  
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Sub GetFileList( ByVal in_dir As String, _ dl |$pm@x  
                 ByRef in_flist() As String ) 3-n&&<  
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    'Redimension the file list array K|6}g7&X  
    Erase in_flist xdY'i0fh  
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    'Tracks how many files are found i.[k"(  
    Dim fCount As Long QJ>=a./  
    fCount = 0 #)#'^MZX  
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    'Recurse directory and search for text files 6z/&j} (  
    Dim f As String jv1p'qs4  
    f = Dir$(in_dir & "*.txt") ?duw0SZ  
    While f <> "" p;R&h4H  
        ReDim Preserve in_flist(fCount) Ae2Y\sAV  
        in_flist(fCount) = f P9Eh, j0_  
        fCount += 1 {_z6  
        f = Dir$() <Nc9F['&#  
    Wend `ZP[-:`  
    ReDim Preserve in_flist(fCount-1) XuZgyt"=r  
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End Sub 9c1q:>|  
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