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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 _"c:Z!L  
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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 ~sbn"OS +  
    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。 fMZzR|_18  
    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。 dtd}P~  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 $|pD}  
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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。 .rs\%M|X  
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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) qjI.Sr70  
    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 h1jEulcMtq  
    例如下所示: vfPIC!  
    Sample name:  EDF-C1-56 drK &  
    Merging data from file EDF-C1-56 0-0.txt Z"Byv.yqb  
    Finished merging RPC data for sample EDF-C1-56 U t'r^  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt KW-g $Ma  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 L|N[.V9  
    a. 创建一个新的散射库 /j:fc?yv  
    b. 散射模型命名 Ch,%xs.)G  
    c. 改变散射模型为“Tabulated BSDF”. /XZ\Yy=  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) fs;pX/:FR  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 >{@:p`*  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 kcyT#'=j  
    g. 点击OK -G@:uxB  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 .:V4>  
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    脚本代码 [2Ot=t6]  
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    '#Language "WWB-COM" OXIy0].b  
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    Option Explicit Mv#\+|p 1x  
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    Sub Main :elTqw>pn  
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        'Cleanup >a$b4 pvh  
        ClearOutputWindow() WSV[)-=:  
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        Print "Merging RPC Photonics BSDF Data Files" <9yB& ^  
        SetTextColor(255,0,0) X Cf!xIv  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." -P[bA0N,  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." \\i$zRi  
        SetTextColor(0,0,0) %^ g(2^  
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        'Current directory of this script (should be the same as the text files being merged) fgEMn;  
        Dim cDir As String f%cbBx^;  
        cDir = MacroDir$ & "\" cu#s}* Ip  
    ):pFI/iC  
        'Array which will be populated with the list of files to be merged =V*4&OU  
        Dim fList() As String, curFile As String {u_2L_  
        GetFileList( cDir, fList ) |?Bb{Es  
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        Print "" W9%B9~\G;+  
        Print "Files found for merging:" 9d1 G u"  
        For Each curFile In fList o dTg.m  
            Print Chr(9) & curFile  &j_:VP  
        Next rN5;W  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 9o|#R&0  
        Dim nameArray() As String, sampName As String )'Yoii{dSU  
        nameArray = Split(fList(0)," 0-0.txt") Hg%8Q@  
        sampName  = nameArray(0) +KKx\m*  
        Print "" nH -1,#`g  
        Print "Sample name: " & Chr(9) & sampName j~VHU89  
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        'Open an output file and write the FRED header data Xsit4Ma  
        Dim outFile As String ZFO*D79:K  
        outFile = cDir & sampName & "_FRED.txt" }$T!qMst{  
        Open outFile For Output As #1 2-!n+#Cdf  
        Print #1, "type bsdf_data" g1zX^^nd,V  
        Print #1, "format angles=deg bsdf=value scale=1" n^7m^1to  
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        'Loop the file list, skip the two header lines and write the remaining data to file #Y'svn1H  
        Dim lineArray() As String, curLine As Long .vJ t&@NO  
        For Each curFile In fList s#2<^6  
            Print "Merging data from file " & curFile $,L,VYN  
            ReadFile( cDir & curFile, lineArray ) At=l>  
            For curLine = 2 To UBound(lineArray) xPJ kadu  
                Print #1, lineArray(curLine) n`af2I2  
            Next 8 y+Nl&"V  
        Next wM#BQe3t#  
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        'Close the output file [H8QxJk  
        Close #1 a{%]X(';  
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        Print "Finished merging RPC data for sample " & sampName Wy.Xx-3W  
        Print "FRED formatted data file: " & Chr(9) & outFile Jb4A!g5C  
    End Sub ?g~g GQV  
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    'Utility function to read the contents of a file into an array of strings. Wr+1G 8  
    Function ReadFile(ByVal fileName As String, _ 2E X Rq  
                      ByRef lineArray() As String) As Long G oJ\6& "  
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        ReadFile = -1 fW'U7&O  
        Dim oFSO As Object qn4jy6  
        Set oFSO = CreateObject("Scripting.FileSystemObject") b 7%O[  
        Erase lineArray ;4rTm@6  
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        Dim fid As Long ,J0BG0jB^u  
        If oFSO.fileexists( fileName ) Then F&I ;E i  
            fid = FreeFile() I N'a5&..  
            Open fileName For Input As fid :x<'>)6  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) zxr|:KC ?&  
            Close fid %Kq`8  
        End If o>'1ct  
        Set oFSO = Nothing ;Pi-H,1b  
        Return UBound( lineArray ) T)NnWEB  
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    End Function F]SA1ry  
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    Sub GetFileList( ByVal in_dir As String, _ s s*% 3<  
                     ByRef in_flist() As String ) g, %xGQ4+  
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        'Redimension the file list array }`,}e259  
        Erase in_flist +s'qcC  
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        'Tracks how many files are found 2"~QI xY=  
        Dim fCount As Long ~e!b81  
        fCount = 0 Evn=3Tw  
    S^Z[w|1  
        'Recurse directory and search for text files kr C4O2Fkj  
        Dim f As String $rh{f<  
        f = Dir$(in_dir & "*.txt") R""P01IZH  
        While f <> "" ?(^HjRUY  
            ReDim Preserve in_flist(fCount) fiq4|!^h  
            in_flist(fCount) = f jB17]OCN  
            fCount += 1 v3i]z9`  
            f = Dir$() d,G:+  
        Wend BF_R8H,<%  
        ReDim Preserve in_flist(fCount-1) ?1?zma S  
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    End Sub >*PZ&"}M  
     
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