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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 `,TPd ~#~  
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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 =PXNg!B}D*  
    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。 #~(@Ka.eA0  
    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。 /K'Kx  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 vVE^Y  
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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。 n1$p esr  
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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) ~ 5`Ngpp  
    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 v)BUt,A  
    例如下所示: ~KEnZa0  
    Sample name:  EDF-C1-56 _)lK.5  
    Merging data from file EDF-C1-56 0-0.txt sd Z=3)  
    Finished merging RPC data for sample EDF-C1-56 df}B:?Ew.  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt vrh}X[JEw'  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 $yRbo '-  
    a. 创建一个新的散射库 852$Ui|I  
    b. 散射模型命名 D`iWf3a.  
    c. 改变散射模型为“Tabulated BSDF”. QTM+ WD  
    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 ) U.d*E/OR5  
    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。 R0{+Xd  
    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 Xig%Q~oMp  
    g. 点击OK DtyT8kr  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Xo }w$q5  
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    脚本代码 S =eP/  
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    '#Language "WWB-COM"  k:R9wo  
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    Option Explicit !j [U  
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    Sub Main ^h=;]vxO  
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        'Cleanup *COr^7Kf5  
        ClearOutputWindow() E9QNx6 2  
    /\h&t6B1  
        Print "Merging RPC Photonics BSDF Data Files" lLo FM  
        SetTextColor(255,0,0) Eo)n( Z9  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." NcRY Ch  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." KG)Y{-Ao  
        SetTextColor(0,0,0) oQFpIX;\m  
    j =[Td   
        'Current directory of this script (should be the same as the text files being merged) 4LKOBiEM  
        Dim cDir As String RVX-3FvP  
        cDir = MacroDir$ & "\" dAohj QH:  
    N!^U{;X7/  
        'Array which will be populated with the list of files to be merged .#EmE'IP*  
        Dim fList() As String, curFile As String ln#Lx&r;|  
        GetFileList( cDir, fList ) !)KX?i[Q  
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        Print "" ^BSMlKyB  
        Print "Files found for merging:" L@9"6&  
        For Each curFile In fList Mt<TEr}7Z=  
            Print Chr(9) & curFile W/xb[w9v  
        Next Fp|x,-  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. KGzBK:  
        Dim nameArray() As String, sampName As String a{,EX[~b  
        nameArray = Split(fList(0)," 0-0.txt") -0Y8/6](  
        sampName  = nameArray(0) tb^3-ZUb  
        Print "" L0_R2E A  
        Print "Sample name: " & Chr(9) & sampName \<a(@#E*~  
    / IAK'/  
        'Open an output file and write the FRED header data GYyP+7K4l[  
        Dim outFile As String "~N#Jqzr:  
        outFile = cDir & sampName & "_FRED.txt" |'b=xeH.^<  
        Open outFile For Output As #1 f \[Z`D  
        Print #1, "type bsdf_data" s0qA8`Yu  
        Print #1, "format angles=deg bsdf=value scale=1" Of SYOL7o  
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        'Loop the file list, skip the two header lines and write the remaining data to file p8Ts5n  
        Dim lineArray() As String, curLine As Long $yI!YX&  
        For Each curFile In fList E;9SsA  
            Print "Merging data from file " & curFile SPn0D9 b]  
            ReadFile( cDir & curFile, lineArray ) 6*{N{]`WZ)  
            For curLine = 2 To UBound(lineArray) J'.U+XU  
                Print #1, lineArray(curLine) zf4@:GM`  
            Next VLkK6W.u  
        Next e(,sFhR  
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        'Close the output file {{SeD:hx  
        Close #1 &iId<.SiJ  
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        Print "Finished merging RPC data for sample " & sampName %7z  
        Print "FRED formatted data file: " & Chr(9) & outFile "#qyX[\  
    End Sub Tr-gdX ;  
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    'Utility function to read the contents of a file into an array of strings. |*e >hk  
    Function ReadFile(ByVal fileName As String, _ GadQ \>  
                      ByRef lineArray() As String) As Long `$fwLC3j  
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        ReadFile = -1 htq#( M  
        Dim oFSO As Object <._MNHC  
        Set oFSO = CreateObject("Scripting.FileSystemObject") NUX0=(k  
        Erase lineArray w`UB_h#Bl  
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        Dim fid As Long ]b-Z;Nce  
        If oFSO.fileexists( fileName ) Then a)`b;]+9  
            fid = FreeFile() &w- QMj M>  
            Open fileName For Input As fid Yvcd(2  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) !/BXMj,=  
            Close fid =O<Ul~JRK  
        End If 3<AZ,gF1  
        Set oFSO = Nothing bYYyXM  
        Return UBound( lineArray ) )K4 |-<i  
    .u>IjK^  
    End Function a#nVRPU8m  
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    Sub GetFileList( ByVal in_dir As String, _ _}vD?/$L  
                     ByRef in_flist() As String ) U:M?Ji5CY  
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        'Redimension the file list array AL>*Vj2h/n  
        Erase in_flist $RuJm\f  
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        'Tracks how many files are found Rq%g5lK  
        Dim fCount As Long 5P ,{h  
        fCount = 0 |-bSoq7t  
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        'Recurse directory and search for text files Q?B5@J  
        Dim f As String Ysz{~E'  
        f = Dir$(in_dir & "*.txt") 4/e-E^  
        While f <> "" <iajtq<Z  
            ReDim Preserve in_flist(fCount) \H!E CTI  
            in_flist(fCount) = f KDhr.P.~  
            fCount += 1 F0t!k>  
            f = Dir$() H-K,Q%;C@  
        Wend G9TK)Nz  
        ReDim Preserve in_flist(fCount-1) <(TTYf8lS  
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    End Sub (Eq0 |"cj  
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