切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1818阅读
    • 0回复

    [分享]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    6421
    光币
    26250
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 4$2HO `@uN  
    A9Ea}v9:  
    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。
    mBrZ{hqS  
    Qt'3v"S>)  
    背景 E<B/5g!  
    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。 7Y.yl F:  
    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。 j1Sjw6}GCH  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    I YptNR  
    Wkb>JnPo  
    $i8oLSRV  
    步骤 P&c O2  
    HWou&<EK  
    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。 &BKnJ {,H  
    x5rm 2C  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    <|WXFjn  
    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) k?3mFWc  
    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 OL#i!ia.  
    例如下所示: {KTZSs $n  
    Sample name:  EDF-C1-56 t]3:vp5N]  
    Merging data from file EDF-C1-56 0-0.txt =VWH8w.3  
    Finished merging RPC data for sample EDF-C1-56 CIwI1VR^  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt %ID48_>*  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 M!VW/vdywL  
    a. 创建一个新的散射库 {}Afah  
    b. 散射模型命名 W1M Bk[:Q  
    c. 改变散射模型为“Tabulated BSDF”. _iqaKYT$  
    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 ) vXdI)Sx[  
    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。 NQ '|M  
    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 /^~)iTwH  
    g. 点击OK )h(=X&(d  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值  - sq= |  
    ,*L3  
    tC+1 1M  
    脚本代码 {Aj=Rj@  
    &ML-\aSal  
    '#Language "WWB-COM" ^#h ;bX#  
    [W'2z,S`WD  
    Option Explicit #; P-*P  
    "[_gRe*2  
    Sub Main dt=M#+g  
    ZS&+<kGD  
        'Cleanup \<} e?Yx%  
        ClearOutputWindow() uqBVKE  
    2R3)/bz-SV  
        Print "Merging RPC Photonics BSDF Data Files" +9;6]4  
        SetTextColor(255,0,0) ob)c0Pz  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." PC,I"l  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." T%TO?[cN  
        SetTextColor(0,0,0) 8js1m55KT  
    y?*Y=,"  
        'Current directory of this script (should be the same as the text files being merged) )5diX + k  
        Dim cDir As String xiC.M6/  
        cDir = MacroDir$ & "\" 0)vX  
    kf' 4C "}  
        'Array which will be populated with the list of files to be merged IV`+B<3  
        Dim fList() As String, curFile As String Jd|E 4h~(  
        GetFileList( cDir, fList ) =@;\9j  
    }f6_ 7W%5  
        Print "" k <LFH(  
        Print "Files found for merging:" 6I5LZ^/G9  
        For Each curFile In fList @Rqn&tA8  
            Print Chr(9) & curFile 0n?^I>j  
        Next z_$F)*PL  
    a0wpsl iF  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^7`gf  
        Dim nameArray() As String, sampName As String +4]f6Zz({  
        nameArray = Split(fList(0)," 0-0.txt") Q\le3KB  
        sampName  = nameArray(0) ^"J)^3j<  
        Print "" :u?L y[x  
        Print "Sample name: " & Chr(9) & sampName EHq?yj;  
    F{m?:A  
        'Open an output file and write the FRED header data j;&su=p"  
        Dim outFile As String U ,\t2z  
        outFile = cDir & sampName & "_FRED.txt" l4E0/ F  
        Open outFile For Output As #1 0ol*!@?  
        Print #1, "type bsdf_data" Xf|I=XK  
        Print #1, "format angles=deg bsdf=value scale=1" 0{47TX*YX  
    X_wPuU%  
        'Loop the file list, skip the two header lines and write the remaining data to file 5mI}IS|@  
        Dim lineArray() As String, curLine As Long Hh qNp U  
        For Each curFile In fList F*,RDM'M  
            Print "Merging data from file " & curFile @aWd0e]  
            ReadFile( cDir & curFile, lineArray ) Dgz^s^fxU  
            For curLine = 2 To UBound(lineArray) 14 hE<u  
                Print #1, lineArray(curLine) /V>yF&p  
            Next =?1B|hdo  
        Next N MH'4R  
    &>Nw>V  
        'Close the output file V.kf@  
        Close #1 yT C+5_7  
    K!|J/W  
        Print "Finished merging RPC data for sample " & sampName TDW\n  
        Print "FRED formatted data file: " & Chr(9) & outFile  bR83N  
    End Sub ^" UZ.@sq'  
    /V E|FTs  
    'Utility function to read the contents of a file into an array of strings. 3m/XT"D  
    Function ReadFile(ByVal fileName As String, _ 6tBe,'*  
                      ByRef lineArray() As String) As Long ~|8-Mo1ce  
    Ibu  5  
        ReadFile = -1 >B+!fi'SS>  
        Dim oFSO As Object Uf\U~wM<  
        Set oFSO = CreateObject("Scripting.FileSystemObject") y9Q.TL>=[  
        Erase lineArray t$ 3/ZTx  
    M:.0]'[s5  
        Dim fid As Long )SWLX\b  
        If oFSO.fileexists( fileName ) Then _G ^Cc}X  
            fid = FreeFile() O g!SFg*  
            Open fileName For Input As fid 5P![fX|5  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) "|d# +C  
            Close fid ]R]%c*tA  
        End If @*5(KIeeC>  
        Set oFSO = Nothing %bgUU|CdA  
        Return UBound( lineArray ) ~>>^7oq  
    3 V0^v  
    End Function yey]#M[y  
    }6 Mo C0  
    Sub GetFileList( ByVal in_dir As String, _ l !:kwF  
                     ByRef in_flist() As String ) C"g bol^  
    G9r~O#=gy  
        'Redimension the file list array 18G=j@k7  
        Erase in_flist QJtO~~-  
    A$W~R  
        'Tracks how many files are found \vqqs  
        Dim fCount As Long D[p`1$E-1v  
        fCount = 0 J*+[?FXRL  
    Apc!!*7  
        'Recurse directory and search for text files `E8D5'tt  
        Dim f As String D` 2w>{Y  
        f = Dir$(in_dir & "*.txt") RZqou|ki  
        While f <> "" b_a6|  
            ReDim Preserve in_flist(fCount) 4* V[^mht  
            in_flist(fCount) = f JO&L1<B{v  
            fCount += 1 ?dAy_| zD  
            f = Dir$() ^W ,~   
        Wend i&\ c DQ 3  
        ReDim Preserve in_flist(fCount-1) ?CE&F<?#@  
    E{{Kz r2$  
    End Sub C,VvbB  
    jUd)|v+t  
    /G= ?E]^  
    QQ:2987619807 QeG3X+  
     
    分享到