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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 Oj0/[(D-  
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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 ?o9g5Z  
    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。 aNCIh@m~  
    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。 6]^}GyM!  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 L%JmdY;  
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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。 j{9sn,<:  
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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) e? fFh,a  
    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 eJ#q! <   
    例如下所示: GV([gs  
    Sample name:  EDF-C1-56 Dw^d!%Ala  
    Merging data from file EDF-C1-56 0-0.txt m>'sM1s  
    Finished merging RPC data for sample EDF-C1-56 Khxl 'qj  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt >LwZ"IE V  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Ed)t87E  
    a. 创建一个新的散射库 b{t'Doe  
    b. 散射模型命名 0> m-J  
    c. 改变散射模型为“Tabulated BSDF”. ^60BQ{ne  
    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 ) Nd*zSsVlq  
    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。 70L{u+wIy  
    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 R1FBH:Iu  
    g. 点击OK `2?9eXC  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 nj~1y ')  
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    脚本代码 { CkxUec  
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    '#Language "WWB-COM" `bffw:; %  
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    Option Explicit ^e>`ob  
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    Sub Main c?CjJ}-7  
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        'Cleanup v*1UNXU\  
        ClearOutputWindow() uHUicZf.  
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        Print "Merging RPC Photonics BSDF Data Files" n97A'"'wz  
        SetTextColor(255,0,0) Cw`v\ 9  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." :~pPB#)nk  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." <IGQBu#ZH  
        SetTextColor(0,0,0) T"XP`gk  
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        'Current directory of this script (should be the same as the text files being merged) 3ADT Yt".  
        Dim cDir As String HKCMKHR  
        cDir = MacroDir$ & "\" e;56}w  
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        'Array which will be populated with the list of files to be merged YsXP$y]g-  
        Dim fList() As String, curFile As String v"Fa_+TVx  
        GetFileList( cDir, fList ) r"SuE:D  
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        Print "" AxUj CerNf  
        Print "Files found for merging:" Aq}]{gfQ1  
        For Each curFile In fList oBQr6-nZ  
            Print Chr(9) & curFile s2Ivd*=mT  
        Next zo&'2I  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. c-!rJHL`  
        Dim nameArray() As String, sampName As String ](4V 3w.  
        nameArray = Split(fList(0)," 0-0.txt") j8!fzJG  
        sampName  = nameArray(0) RX%*:lXi_  
        Print "" 3HC aZ?Ry'  
        Print "Sample name: " & Chr(9) & sampName |r!G(an1x4  
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        'Open an output file and write the FRED header data l~wx8 ,?G  
        Dim outFile As String ;=Jj{FoG%  
        outFile = cDir & sampName & "_FRED.txt" Z16G  
        Open outFile For Output As #1 Z}TuVE  
        Print #1, "type bsdf_data" _=XzQZT!L  
        Print #1, "format angles=deg bsdf=value scale=1" J (Yfup  
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        'Loop the file list, skip the two header lines and write the remaining data to file CE:TQzg  
        Dim lineArray() As String, curLine As Long !9DqW&8  
        For Each curFile In fList -kxNJ Gc?  
            Print "Merging data from file " & curFile @kn0f`  
            ReadFile( cDir & curFile, lineArray ) %p)6m 2Sb  
            For curLine = 2 To UBound(lineArray) xxgS!J  
                Print #1, lineArray(curLine) /pZLt)=P  
            Next g= k}6"F~  
        Next dX: (%_Mn  
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        'Close the output file @dV'v{:,  
        Close #1 0: R}  
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        Print "Finished merging RPC data for sample " & sampName 8MGtJ'.  
        Print "FRED formatted data file: " & Chr(9) & outFile =O1N*'e  
    End Sub Ey=(B'A~  
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    'Utility function to read the contents of a file into an array of strings. ! R?r)G5E  
    Function ReadFile(ByVal fileName As String, _ [ /w{,+U  
                      ByRef lineArray() As String) As Long ^[Cpu_]D  
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        ReadFile = -1 A!No:?S  
        Dim oFSO As Object sH(4.36+  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ttuQ ,SD  
        Erase lineArray A9ia[2[  
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        Dim fid As Long ao#{N=mn  
        If oFSO.fileexists( fileName ) Then uOc :^  
            fid = FreeFile() A1zM$ wDU  
            Open fileName For Input As fid }(z[ rZ  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) VG^*?62  
            Close fid \dTX%<5D  
        End If '{p/F $  
        Set oFSO = Nothing #ok1qT9_  
        Return UBound( lineArray ) M5s>;q)  
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    End Function > $DMVtE0  
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    Sub GetFileList( ByVal in_dir As String, _ (wU<Kpt?J  
                     ByRef in_flist() As String ) <61T)7  
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        'Redimension the file list array F0W4B  
        Erase in_flist M?Tb9c?`  
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        'Tracks how many files are found MWl?pG!Y  
        Dim fCount As Long #'fh'$5"  
        fCount = 0 VliX'.-  
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        'Recurse directory and search for text files 'd4I/  
        Dim f As String A!\ouKyayS  
        f = Dir$(in_dir & "*.txt") q`_d>l  
        While f <> "" QE*O~Yj  
            ReDim Preserve in_flist(fCount) >UvLeS2h:y  
            in_flist(fCount) = f "{1`~pDj?  
            fCount += 1 ;= ^kTb`X  
            f = Dir$() bD*V$w*P  
        Wend . >[d:0  
        ReDim Preserve in_flist(fCount-1) Osncl5PD)  
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    End Sub xDU>y  
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