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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 ^(f4*m6`  
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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 )wtaKF.-  
    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。 m8JR@!t7  
    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。 u=NS sTP&  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 `L5~mb;7*  
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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。 $ RwB_F  
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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) cZ+7.oDu  
    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 Tv]<SI<B[  
    例如下所示: q *AQq=  
    Sample name:  EDF-C1-56 HXVBb%pP  
    Merging data from file EDF-C1-56 0-0.txt HygY>s+3[  
    Finished merging RPC data for sample EDF-C1-56 ]G}B 0u3  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt desThnT w  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +wk`;0sA  
    a. 创建一个新的散射库 RF!1oZ  
    b. 散射模型命名 T\# *S0^  
    c. 改变散射模型为“Tabulated BSDF”. ` C+HE$B  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) R,!Q Zxmg  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 o:dR5v  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 l0Ti Z  
    g. 点击OK JH]K/sC>  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 l  n }}5Q  
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    脚本代码 0ZPV' `KGp  
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    '#Language "WWB-COM" ,Ci/xnI  
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    Option Explicit x q-$\#O  
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    Sub Main "x&C5l}n  
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        'Cleanup iY/KSX^~O  
        ClearOutputWindow() bT!($?GNdg  
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        Print "Merging RPC Photonics BSDF Data Files" j%*7feSNC  
        SetTextColor(255,0,0) 4*UP. r@  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." :Px\qh}K  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." jB^OP1  
        SetTextColor(0,0,0) /=#~  
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        'Current directory of this script (should be the same as the text files being merged) 88a<{5 :z  
        Dim cDir As String , Ut Hc]  
        cDir = MacroDir$ & "\" r<L#q)]  
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        'Array which will be populated with the list of files to be merged *R`MMm  
        Dim fList() As String, curFile As String Yi rC*  
        GetFileList( cDir, fList ) ; a/cty0Ch  
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        Print "" 4W\,y_Q o  
        Print "Files found for merging:" K{ }4zuZ  
        For Each curFile In fList 5>ST"l_ca  
            Print Chr(9) & curFile cc >  
        Next ^4`&EF  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^^$vR[7  
        Dim nameArray() As String, sampName As String 8gmn6dCf  
        nameArray = Split(fList(0)," 0-0.txt") abY0)t  
        sampName  = nameArray(0) 0B0G2t&hr  
        Print "" >4![&&  
        Print "Sample name: " & Chr(9) & sampName j/<??v4F4  
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        'Open an output file and write the FRED header data bGh0<r7R  
        Dim outFile As String 6;uBZ &g  
        outFile = cDir & sampName & "_FRED.txt" o|2 87S|$  
        Open outFile For Output As #1 ^w6eWzI  
        Print #1, "type bsdf_data" oG_~3Kt  
        Print #1, "format angles=deg bsdf=value scale=1" zw:/!MS  
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        'Loop the file list, skip the two header lines and write the remaining data to file S[@6Lp3q_  
        Dim lineArray() As String, curLine As Long .Y/-8H-3v  
        For Each curFile In fList D$_8rHc\A  
            Print "Merging data from file " & curFile Cals?u#U=  
            ReadFile( cDir & curFile, lineArray ) .w FU:y4r  
            For curLine = 2 To UBound(lineArray) ?2~U2Ir]:  
                Print #1, lineArray(curLine) oa9)Dv  
            Next uU+s!C9r  
        Next $ WFhBak8  
    o?R,0 -  
        'Close the output file wd`R4CKhP]  
        Close #1 L+Nsi~YVq  
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        Print "Finished merging RPC data for sample " & sampName c=t*I0-OVS  
        Print "FRED formatted data file: " & Chr(9) & outFile @bQ!zCI  
    End Sub .D@/y uV  
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    'Utility function to read the contents of a file into an array of strings. aVK()1v]  
    Function ReadFile(ByVal fileName As String, _ f sX;Nj]  
                      ByRef lineArray() As String) As Long T^.{9F]*S  
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        ReadFile = -1 U5wTGv4S|  
        Dim oFSO As Object 2?*1~ 5~I  
        Set oFSO = CreateObject("Scripting.FileSystemObject") J:W'cH$cR  
        Erase lineArray bVmvjY4  
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        Dim fid As Long &(\@sxAyZ  
        If oFSO.fileexists( fileName ) Then ?xHtn2(q  
            fid = FreeFile() )O-sWh4  
            Open fileName For Input As fid & ^!v*=z  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) XkoWL  
            Close fid n1`T#%e  
        End If NQ3|\<Wt  
        Set oFSO = Nothing 9_` 3IJ  
        Return UBound( lineArray ) ^k9rDn/AW  
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    End Function :dbV2'vIQ  
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    Sub GetFileList( ByVal in_dir As String, _ _9qEZV  
                     ByRef in_flist() As String ) L3' \r  
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        'Redimension the file list array 'v`~(9'Rcj  
        Erase in_flist .i\wE@v  
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        'Tracks how many files are found [EcV\.  
        Dim fCount As Long *kV#)j  
        fCount = 0 1o)=GV1  
    z+2u-jG  
        'Recurse directory and search for text files oYGUjI  
        Dim f As String Cg?I'1]o6  
        f = Dir$(in_dir & "*.txt") m>+A*M8  
        While f <> "" Fj48quW1\P  
            ReDim Preserve in_flist(fCount) _/8y1) I  
            in_flist(fCount) = f #s/{u RYQ  
            fCount += 1 <X9T-b"$h  
            f = Dir$() \j/}rzo]  
        Wend s=}~Q&8  
        ReDim Preserve in_flist(fCount-1) gtl;P_  
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    End Sub /!o1l\i=5  
     
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