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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 .N>*+U>>P  
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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 Tt9cX}&&  
    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。 *iY:R  
    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。 GqNOWK2O  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 /P-#y@I  
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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。 ~QlF(@u e  
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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) .gGO+8[N*  
    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 mI{Fs|9h  
    例如下所示: SOX7  
    Sample name:  EDF-C1-56 [mQ1r*[j  
    Merging data from file EDF-C1-56 0-0.txt $j(d`@.DN~  
    Finished merging RPC data for sample EDF-C1-56 - f ^ ! R  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt h_ccE 6]t  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 v&(=^A\eN  
    a. 创建一个新的散射库 0>Td4qr+u  
    b. 散射模型命名 I^( pZ9  
    c. 改变散射模型为“Tabulated BSDF”. 4X*U~}  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) &o7PB` (l  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 CbW[_\  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 1<Mb@t  
    g. 点击OK IY8<^Q']  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ~OsLbz:  
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    脚本代码 Hc@_@G  
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    '#Language "WWB-COM" ;-JFb$m  
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    Option Explicit aNY-F)XWa  
    /*>}y$  
    Sub Main Mh2b!B  
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        'Cleanup iZiT/#,H2  
        ClearOutputWindow() tY]?2u%)  
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        Print "Merging RPC Photonics BSDF Data Files" uF|_6~g  
        SetTextColor(255,0,0) V s xI  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 5,oLl {S'  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ~E((n  
        SetTextColor(0,0,0) Q W,:'\G  
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        'Current directory of this script (should be the same as the text files being merged) gED|2%BXb  
        Dim cDir As String "_LqIW1   
        cDir = MacroDir$ & "\" WkE="E}  
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        'Array which will be populated with the list of files to be merged Z2yO /$<  
        Dim fList() As String, curFile As String 0Fon`3(^\  
        GetFileList( cDir, fList ) CmbgEGIh[a  
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        Print "" 6,jCO@!   
        Print "Files found for merging:" %{4 U\4d@'  
        For Each curFile In fList ?Y -;781  
            Print Chr(9) & curFile 1U.X[}e  
        Next "= %"@"<)  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ]NBx5m+y@i  
        Dim nameArray() As String, sampName As String ^7? WR?!  
        nameArray = Split(fList(0)," 0-0.txt") 2[3t7C  
        sampName  = nameArray(0) 'dh{q`#0  
        Print "" Rvu5#_P  
        Print "Sample name: " & Chr(9) & sampName HyWR&0J  
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        'Open an output file and write the FRED header data csLbzDg  
        Dim outFile As String UCmy$aW  
        outFile = cDir & sampName & "_FRED.txt" BF2U$-k4  
        Open outFile For Output As #1 kZF<~U  
        Print #1, "type bsdf_data" Rh)XYCM  
        Print #1, "format angles=deg bsdf=value scale=1" ^o _J0 ]m  
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        'Loop the file list, skip the two header lines and write the remaining data to file h9im S\gfr  
        Dim lineArray() As String, curLine As Long :Ch XzZ  
        For Each curFile In fList \WTKw x  
            Print "Merging data from file " & curFile j7Y7&x"  
            ReadFile( cDir & curFile, lineArray ) =oh%-Sh:  
            For curLine = 2 To UBound(lineArray) C{^I}p  
                Print #1, lineArray(curLine) ?)(/SZC0  
            Next ~' 955fK>  
        Next `5h^!="  
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        'Close the output file D6?h 6`J  
        Close #1 @w.DN)GPo  
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        Print "Finished merging RPC data for sample " & sampName v@GhwL  
        Print "FRED formatted data file: " & Chr(9) & outFile +:ms`Sr>  
    End Sub ?.F^Oi6 u  
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    'Utility function to read the contents of a file into an array of strings. Zqe$S +u  
    Function ReadFile(ByVal fileName As String, _ u&S0  
                      ByRef lineArray() As String) As Long `i(b%$|^&Z  
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        ReadFile = -1 2bw) , W  
        Dim oFSO As Object O%>*=h`P  
        Set oFSO = CreateObject("Scripting.FileSystemObject") @|t]9  
        Erase lineArray ^ swj!da  
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        Dim fid As Long 1,OkuyXy!>  
        If oFSO.fileexists( fileName ) Then %>9L}OAm  
            fid = FreeFile() :NWIUN  
            Open fileName For Input As fid Wp:vz']V  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) d`flYNg4  
            Close fid ;8&/JSN M  
        End If 3V^5 4_  
        Set oFSO = Nothing yl@Nyu  
        Return UBound( lineArray ) MbInXv$q2/  
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    End Function (2Lmu[  
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    Sub GetFileList( ByVal in_dir As String, _ ']\SX*z?  
                     ByRef in_flist() As String ) L;M@]  
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        'Redimension the file list array -?1R l:rM  
        Erase in_flist ST[TKL<]  
    ]v>[r?X#V  
        'Tracks how many files are found pi#a!Quf\  
        Dim fCount As Long Z+6WG  
        fCount = 0 d6[' [dG  
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        'Recurse directory and search for text files 7 qn=W  
        Dim f As String z(%tu  
        f = Dir$(in_dir & "*.txt") wY%t# [T3  
        While f <> "" 2NjgLXP  
            ReDim Preserve in_flist(fCount) z>,tP  
            in_flist(fCount) = f }s'=w]m  
            fCount += 1 C<T6l'S{?  
            f = Dir$() iQ2}*:Jc$  
        Wend p&<n_b  
        ReDim Preserve in_flist(fCount-1) d(RMD  
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    End Sub V*2 * 5hx  
     
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