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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 `B A'a" $  
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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 V'q?+p] a  
    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。 Hh1]\4D,4  
    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。 q?* z<)#  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 #>ob1b|  
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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。 EEn8]qJC  
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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) chE}TK  
    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 H,3WdSL`K  
    例如下所示: ,6 IKkyD  
    Sample name:  EDF-C1-56 B{lj.S` mB  
    Merging data from file EDF-C1-56 0-0.txt q21l{R{Y  
    Finished merging RPC data for sample EDF-C1-56 )vsX (/WU  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt {zTnE?(o`  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 bk=ee7E7>  
    a. 创建一个新的散射库 U!\~LKfA  
    b. 散射模型命名 FX1H2N(  
    c. 改变散射模型为“Tabulated BSDF”. sW,JnR  
    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 ) W>j@E|m$  
    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。 sx n{uRF  
    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 #I"s{*  
    g. 点击OK -hY@r 7y  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 X5tx(}j  
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    脚本代码 6dncUfB  
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    '#Language "WWB-COM" < 2SWfH1>  
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    Option Explicit dSI<s^n  
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    Sub Main >/4N:=.h  
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        'Cleanup }0Ie Kpu5  
        ClearOutputWindow() x']Fe7nv  
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        Print "Merging RPC Photonics BSDF Data Files" b+CJRB1  
        SetTextColor(255,0,0) v&qL r+_7  
        Print "Note: Script should be located in the same folder as the BSDF TXT files."  :Y Ki  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." S J2l6  
        SetTextColor(0,0,0) RcC5_@W  
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        'Current directory of this script (should be the same as the text files being merged) 3yrb7Rn3  
        Dim cDir As String SLW|)Q24  
        cDir = MacroDir$ & "\" bXi!_'z$  
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        'Array which will be populated with the list of files to be merged w{*PZb4  
        Dim fList() As String, curFile As String 1\a.o[g3e  
        GetFileList( cDir, fList ) Ew JNpecX  
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        Print "" );zLgNx,  
        Print "Files found for merging:" j5wfqi  
        For Each curFile In fList LS$zA>:  
            Print Chr(9) & curFile unih"};ou  
        Next M-Ek(K3SRf  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. KM+[1Ze$  
        Dim nameArray() As String, sampName As String fx-8mf3  
        nameArray = Split(fList(0)," 0-0.txt") uBl&{$<  
        sampName  = nameArray(0) & 'CUc/,  
        Print "" N% ?R(  
        Print "Sample name: " & Chr(9) & sampName >=4('  
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        'Open an output file and write the FRED header data iu?gZVyka  
        Dim outFile As String a^8PB|G  
        outFile = cDir & sampName & "_FRED.txt" R nwFxFIQ  
        Open outFile For Output As #1 }<YU4EW  
        Print #1, "type bsdf_data" 2M*i'K;;)P  
        Print #1, "format angles=deg bsdf=value scale=1" snWe&-  
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        'Loop the file list, skip the two header lines and write the remaining data to file fTso[r:F.  
        Dim lineArray() As String, curLine As Long SpImd IpD  
        For Each curFile In fList >(-A"jf  
            Print "Merging data from file " & curFile `{|w*)mD  
            ReadFile( cDir & curFile, lineArray ) 0'HQ=pP  
            For curLine = 2 To UBound(lineArray) ap8q`a{j^  
                Print #1, lineArray(curLine) T(qTipq0  
            Next P2@Z7DhQ  
        Next Wb>;L@jB7  
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        'Close the output file yM`u]p1  
        Close #1 d@ >i=l [  
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        Print "Finished merging RPC data for sample " & sampName `yP`5a/  
        Print "FRED formatted data file: " & Chr(9) & outFile e_|Z&  
    End Sub @H<*|3J  
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    'Utility function to read the contents of a file into an array of strings. 51`&%V{daL  
    Function ReadFile(ByVal fileName As String, _ r^a:s]  
                      ByRef lineArray() As String) As Long LRg]'?  
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        ReadFile = -1 J&s$Wqf  
        Dim oFSO As Object 7nPcm;Er  
        Set oFSO = CreateObject("Scripting.FileSystemObject") F(#?-MCs  
        Erase lineArray Lg~C:BN F  
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        Dim fid As Long 0>8w On  
        If oFSO.fileexists( fileName ) Then /`l;u 7RD  
            fid = FreeFile() Aj|->Y  
            Open fileName For Input As fid k qL.ZR  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) f9 \$,7F  
            Close fid x\U[5d   
        End If - om9 Z0e  
        Set oFSO = Nothing "a= Hr4C*r  
        Return UBound( lineArray ) e MHz/;I  
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    End Function v7SYWO#  
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    Sub GetFileList( ByVal in_dir As String, _ &92/qRh7  
                     ByRef in_flist() As String ) DnFzCJ  
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        'Redimension the file list array ,f2oO?L}  
        Erase in_flist Q"ZpT  
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        'Tracks how many files are found a_V\[V{R=  
        Dim fCount As Long .wD $Bsm`t  
        fCount = 0 >x JzV  
    ":8\2Qp  
        'Recurse directory and search for text files u\Ylo.)b  
        Dim f As String L7Hv)  
        f = Dir$(in_dir & "*.txt") NJQ)Ttt  
        While f <> "" 8W{M}>;[9  
            ReDim Preserve in_flist(fCount) O-X(8<~H=  
            in_flist(fCount) = f !9WGZfK+0Y  
            fCount += 1 OemY'M? ZQ  
            f = Dir$() p X{wEc6}  
        Wend L?j0t*do  
        ReDim Preserve in_flist(fCount-1) A4!X{qUT-  
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    End Sub Ig t*8px  
     
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