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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 $RV'DQO  
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    RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。
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    背景 tPho4,x$  
    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。 y]E ?\03"  
    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。 2<5s0GT'/  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 nc%ly *  
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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。 g\ p;  
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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) 'm+)n08[  
    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 kculHIa\.  
    例如下所示: Wtwh.\Jba  
    Sample name:  EDF-C1-56 cLe659&  
    Merging data from file EDF-C1-56 0-0.txt #N"K4@]{  
    Finished merging RPC data for sample EDF-C1-56 mEe JK3D[  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ?k*s!YCZ  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 iw^(3FcP@C  
    a. 创建一个新的散射库 geu8$^  
    b. 散射模型命名 bI~(<-S~K  
    c. 改变散射模型为“Tabulated BSDF”. ?yt"  
    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 ) KBo/GBD]|  
    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。 h $}&N  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 38T2IN  
    g. 点击OK K"r'w8  P  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 t,K_!-HX+  
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    脚本代码 Q2[D|{Z  
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    '#Language "WWB-COM" 3M{/9rR[  
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    Option Explicit <t0o{}^P*  
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    Sub Main M[R\URu8  
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        'Cleanup :jq   
        ClearOutputWindow() 9RoN,e8!  
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        Print "Merging RPC Photonics BSDF Data Files" =?f\o*J)  
        SetTextColor(255,0,0) .q1OT>  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." "p~1| ?T  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 4W9#z~'  
        SetTextColor(0,0,0) gs_nUgcA  
    =MqefV;-  
        'Current directory of this script (should be the same as the text files being merged) Py[Z9KLX  
        Dim cDir As String ^\uj&K6l  
        cDir = MacroDir$ & "\" 8*^Q#;^~99  
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        'Array which will be populated with the list of files to be merged `\:9 2+  
        Dim fList() As String, curFile As String &Q[Y&vNn  
        GetFileList( cDir, fList ) MKYXYR  
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        Print "" Fss7xP'  
        Print "Files found for merging:" r~uWr'}a}  
        For Each curFile In fList Q2)z1'Wv  
            Print Chr(9) & curFile d aIt `}s  
        Next joh=0nk;D  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. sSC yjS'T  
        Dim nameArray() As String, sampName As String 2rq)U+   
        nameArray = Split(fList(0)," 0-0.txt") t/K<fy 6  
        sampName  = nameArray(0) Kd _tjWS  
        Print "" Brh<6Btl  
        Print "Sample name: " & Chr(9) & sampName !tT$}?Ano  
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        'Open an output file and write the FRED header data >uuP@j  
        Dim outFile As String RbJ,J)C>  
        outFile = cDir & sampName & "_FRED.txt" 42?X)n>  
        Open outFile For Output As #1 I% 43rdoPe  
        Print #1, "type bsdf_data" VrA9}"1x~*  
        Print #1, "format angles=deg bsdf=value scale=1" _W4i?Bde  
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        'Loop the file list, skip the two header lines and write the remaining data to file 8Vj]whE  
        Dim lineArray() As String, curLine As Long B1oy,'  
        For Each curFile In fList qh/q<  
            Print "Merging data from file " & curFile HPAd@5d(  
            ReadFile( cDir & curFile, lineArray ) =~% B}T  
            For curLine = 2 To UBound(lineArray) ;6I{7[  
                Print #1, lineArray(curLine) MC!K7ji  
            Next +!6C^G  
        Next 9KVeFl  
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        'Close the output file !6ZkLE[XJ<  
        Close #1 x[3kCa|4A  
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        Print "Finished merging RPC data for sample " & sampName 9~DoF]TM  
        Print "FRED formatted data file: " & Chr(9) & outFile BW}^n  
    End Sub  yf!  
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    'Utility function to read the contents of a file into an array of strings. jYet!l  
    Function ReadFile(ByVal fileName As String, _ inavi5.  
                      ByRef lineArray() As String) As Long IBY3QG  
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        ReadFile = -1 z]> 0A  
        Dim oFSO As Object XB-pOtVm  
        Set oFSO = CreateObject("Scripting.FileSystemObject") FS r`Y  
        Erase lineArray _JA.~edqM  
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        Dim fid As Long 2f>lgZ!  
        If oFSO.fileexists( fileName ) Then dWE[*a\g  
            fid = FreeFile() |C@)#.nm[  
            Open fileName For Input As fid o(w1!spA  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) HH3WZ^0>  
            Close fid 2i#wJ8vrF  
        End If O,ZvV3  
        Set oFSO = Nothing t<9oEjk["  
        Return UBound( lineArray ) )'xTDi  
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    End Function PIn'tV  
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    Sub GetFileList( ByVal in_dir As String, _ '5KgRK"  
                     ByRef in_flist() As String ) k/O|ia 6  
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        'Redimension the file list array 3@?#4]D{'  
        Erase in_flist X3I\O,"I  
    D{h1"q  
        'Tracks how many files are found zTBr<:  
        Dim fCount As Long x`w 4LF  
        fCount = 0 [[QrGJr  
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        'Recurse directory and search for text files eb2~$ ,$  
        Dim f As String +O}6 8 N  
        f = Dir$(in_dir & "*.txt") Ooz+V;#Q  
        While f <> "" uh%%MhTjv  
            ReDim Preserve in_flist(fCount) _L(6F T J  
            in_flist(fCount) = f G5E03xvL  
            fCount += 1 gVsAz  
            f = Dir$() cUaLv1:HI  
        Wend p-UACMN& c  
        ReDim Preserve in_flist(fCount-1) Ttb @98  
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    End Sub V{@<Z8sW#  
     
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