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    [分享]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: 2020-12-15
    摘要 z2_*%S@  
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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 d *|Y o  
    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。 HJLG=mU  
    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。 +_?hK{Ib"  
    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 +G|  
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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。 :I j{s  
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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) {W =%U|f  
    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 dGYn4i2k?  
    例如下所示: :0j?oY~e  
    Sample name:  EDF-C1-56 z0p*Z&  
    Merging data from file EDF-C1-56 0-0.txt 8 S:w7Hr  
    Finished merging RPC data for sample EDF-C1-56 +,T RfP Fb  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt I {S;L  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 h5{'Q$Erl  
    a. 创建一个新的散射库 G_3O]BMKd)  
    b. 散射模型命名 ?cBwPetp  
    c. 改变散射模型为“Tabulated BSDF”. hYT0l$Ng  
    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 ) uy[At+%zg  
    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。 0_95|3kc  
    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 [fya)}  
    g. 点击OK 6y%qVx#!  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (lBCO?`fx  
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    脚本代码 dh`K`b4I  
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    '#Language "WWB-COM" ]_mb7X>  
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    Option Explicit <y2U3; t  
    fn jPSts0  
    Sub Main IXMop7~  
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        'Cleanup *KZYv=s,u  
        ClearOutputWindow() ?yrX)3hyH  
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        Print "Merging RPC Photonics BSDF Data Files" iW]j9}t  
        SetTextColor(255,0,0) q 6:dy  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." [64:4/<}  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 'Vzp2  
        SetTextColor(0,0,0) T] f ;km  
    ?(' wn<  
        'Current directory of this script (should be the same as the text files being merged) L:KF_W.I+  
        Dim cDir As String <.x{|p  
        cDir = MacroDir$ & "\" m)ky*"(  
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        'Array which will be populated with the list of files to be merged y|C(X  
        Dim fList() As String, curFile As String VZp5)-!\  
        GetFileList( cDir, fList ) guq{#?}  
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        Print "" [`#CXq'  
        Print "Files found for merging:" z\\[S@>pt  
        For Each curFile In fList LiC*@W  
            Print Chr(9) & curFile 2.`\  
        Next O W_{$9U  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. FZ{h?#2?  
        Dim nameArray() As String, sampName As String *<$*"p  
        nameArray = Split(fList(0)," 0-0.txt") Q,,e+exbb5  
        sampName  = nameArray(0) G)AqbY  
        Print "" 0JWDtmK=C  
        Print "Sample name: " & Chr(9) & sampName e@L=LW>  
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        'Open an output file and write the FRED header data  R~TTL  
        Dim outFile As String yJ[0WY8<kC  
        outFile = cDir & sampName & "_FRED.txt" A]_7}<<N  
        Open outFile For Output As #1 2 ~dE<}  
        Print #1, "type bsdf_data" 70 yFaW  
        Print #1, "format angles=deg bsdf=value scale=1" >2Y=*K,:  
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        'Loop the file list, skip the two header lines and write the remaining data to file +C^nO=[E  
        Dim lineArray() As String, curLine As Long Z\(q@3C  
        For Each curFile In fList YU'k#\gi*  
            Print "Merging data from file " & curFile vz@A;t  
            ReadFile( cDir & curFile, lineArray ) <v"R.<  
            For curLine = 2 To UBound(lineArray) nQF(vTDN  
                Print #1, lineArray(curLine) J@/kIrx  
            Next ")1:F>  
        Next juP7P[d$qW  
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        'Close the output file 0gu_yg!R  
        Close #1 s-NX o  
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        Print "Finished merging RPC data for sample " & sampName <X#C)-.  
        Print "FRED formatted data file: " & Chr(9) & outFile 9sM!`Lz{  
    End Sub .y'>[  
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    'Utility function to read the contents of a file into an array of strings. 4V"E8rUL(  
    Function ReadFile(ByVal fileName As String, _ ob!P ;]T  
                      ByRef lineArray() As String) As Long 7RQR)DG  
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        ReadFile = -1 c rQ8q;:  
        Dim oFSO As Object nd`1m[7MNu  
        Set oFSO = CreateObject("Scripting.FileSystemObject") a)!o @  
        Erase lineArray ./XYd"p  
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        Dim fid As Long \Zb;'eDv  
        If oFSO.fileexists( fileName ) Then nF}vw |r>x  
            fid = FreeFile() #QZe,"C9`  
            Open fileName For Input As fid b;L\EB  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) mupT<_Y  
            Close fid b8H{8{wi|  
        End If \wmN  
        Set oFSO = Nothing g%aYDl  
        Return UBound( lineArray ) V_)-#=J  
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    End Function 9FF0%*tGo  
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    Sub GetFileList( ByVal in_dir As String, _ Oz.HH  
                     ByRef in_flist() As String ) >e lJkq|  
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        'Redimension the file list array j<upRS,$  
        Erase in_flist oE6tauQn  
    mb 1FWy=3  
        'Tracks how many files are found y4yhF8E>;U  
        Dim fCount As Long )',R[|<  
        fCount = 0 fT|.@%"vc  
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        'Recurse directory and search for text files pR<`H'  
        Dim f As String rV.}PtcFY  
        f = Dir$(in_dir & "*.txt") Z<oaK  
        While f <> "" aNsBcov3O  
            ReDim Preserve in_flist(fCount) n>z9K')  
            in_flist(fCount) = f Nd4f^Y   
            fCount += 1 KV91)U  
            f = Dir$() 'I|v[G$l  
        Wend <(#(hDwy  
        ReDim Preserve in_flist(fCount-1) qyb?49I  
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    End Sub . P viA  
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