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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 "-\8Y>E  
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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 q3`~uTzk  
    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。 qC3PKlhv6  
    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。  yyGn <  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 gGx<k3W^  
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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。 -C8LM ls  
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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) 0Hx'C^m72  
    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 E,fbIyX  
    例如下所示: ce*?crOV  
    Sample name:  EDF-C1-56 $LG.rJ/*  
    Merging data from file EDF-C1-56 0-0.txt A-*MH#QUKh  
    Finished merging RPC data for sample EDF-C1-56 IJC]Al,df  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 8"A0@fNz  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 DR]4Tcz#  
    a. 创建一个新的散射库 /B|"<`-H  
    b. 散射模型命名 " t?44[  
    c. 改变散射模型为“Tabulated BSDF”. ?A04qk  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) x3F94+<n{  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 QU(Lv(/O  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 phB d+zQc  
    g. 点击OK YN~1.!F  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 FEX67A8 /;  
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    脚本代码 GIfs]zVr`  
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    '#Language "WWB-COM" FC  
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    Option Explicit PnL?zae  
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    Sub Main EfkBo5@Qi  
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        'Cleanup Kzy9i/bL  
        ClearOutputWindow()  )\kNufP  
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        Print "Merging RPC Photonics BSDF Data Files" 19RbIG/X  
        SetTextColor(255,0,0) k(v &+v  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Ga V OMT  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ylDfr){  
        SetTextColor(0,0,0) 6WoFf  
    !1@o Z(  
        'Current directory of this script (should be the same as the text files being merged) ;Wsl 'e/  
        Dim cDir As String C;#gy-  
        cDir = MacroDir$ & "\" _@VKWU$$  
    A7eYKo q  
        'Array which will be populated with the list of files to be merged uax kGEXr  
        Dim fList() As String, curFile As String O2fFh_\  
        GetFileList( cDir, fList ) "{d[V(lE"  
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        Print "" F=f9##Y?7M  
        Print "Files found for merging:" s?fEorG  
        For Each curFile In fList 85Kf>z::c  
            Print Chr(9) & curFile A0Q1"b=  
        Next Ih;D-^RQ  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Mko,((>I1  
        Dim nameArray() As String, sampName As String ~q}]/0-m  
        nameArray = Split(fList(0)," 0-0.txt") Ri}JM3\J  
        sampName  = nameArray(0) l1%*LyD  
        Print "" 5d}bl{  
        Print "Sample name: " & Chr(9) & sampName PWyFys  
    2P{! n#"  
        'Open an output file and write the FRED header data o=F!&]+  
        Dim outFile As String T(k:\z/  
        outFile = cDir & sampName & "_FRED.txt" 6)FM83zk)K  
        Open outFile For Output As #1 vkW;qt}yO  
        Print #1, "type bsdf_data" z5sKV7&\[n  
        Print #1, "format angles=deg bsdf=value scale=1" f917F.1 I  
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        'Loop the file list, skip the two header lines and write the remaining data to file EJJ&`,q  
        Dim lineArray() As String, curLine As Long }/g1  
        For Each curFile In fList Hl8\*#;C&>  
            Print "Merging data from file " & curFile cCIs~*D  
            ReadFile( cDir & curFile, lineArray ) akwS;|SZ  
            For curLine = 2 To UBound(lineArray) 6^FUuj.  
                Print #1, lineArray(curLine) "L9pFz</  
            Next 6c}nP[6|  
        Next 9'KOc5@l^  
    1J&hm[3[K  
        'Close the output file 0,iG9D 7  
        Close #1 Qr?(2t#  
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        Print "Finished merging RPC data for sample " & sampName Ju.T.)H  
        Print "FRED formatted data file: " & Chr(9) & outFile nzU0=w}V  
    End Sub ZKi?;ta=  
    8P2_/)|  
    'Utility function to read the contents of a file into an array of strings. '2{60t_A  
    Function ReadFile(ByVal fileName As String, _ T'N/A9{q  
                      ByRef lineArray() As String) As Long |1T[P)Q  
    R]o2_r7N"}  
        ReadFile = -1 P+0 -h  
        Dim oFSO As Object cWI7];/d;  
        Set oFSO = CreateObject("Scripting.FileSystemObject") $tK/3  
        Erase lineArray :r&4/sN}<  
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        Dim fid As Long ETfoL.d$(  
        If oFSO.fileexists( fileName ) Then xI~c~KC  
            fid = FreeFile() @X_)%Y-^O  
            Open fileName For Input As fid `<% w4 E  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ,LL=b-Es  
            Close fid jW}hLjlN  
        End If [Fr <tKtB  
        Set oFSO = Nothing qc6d,z/  
        Return UBound( lineArray ) ^5-SL?E  
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    End Function <In+V  
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    Sub GetFileList( ByVal in_dir As String, _ yeV|j\TJI.  
                     ByRef in_flist() As String ) /qd~|[Kx:  
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        'Redimension the file list array ?6:e%YT  
        Erase in_flist IY|>'}UU#  
    s6I/%R3  
        'Tracks how many files are found e ,A9N%M  
        Dim fCount As Long D]K?ntS[*  
        fCount = 0 OL623jQX  
    p Acu{5#7  
        'Recurse directory and search for text files AHLXmQl  
        Dim f As String U@)WTH6d  
        f = Dir$(in_dir & "*.txt") =AeOkie  
        While f <> "" \%.&$z3wz  
            ReDim Preserve in_flist(fCount) RNX>I,2sh  
            in_flist(fCount) = f <@qJsRbhK  
            fCount += 1 ?lIh&C8]X  
            f = Dir$() 8ZDWaq8^2N  
        Wend gy/bA  
        ReDim Preserve in_flist(fCount-1) &"X1w $  
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    End Sub 4TaHS!9  
     
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