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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 t8+?U^j  
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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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    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。 )l`1)Ea~  
    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。 9{_8cpm4  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 }x*7l`1  
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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。 /8f>':zUb  
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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) %lN2n,AK  
    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 /_]ltXD  
    例如下所示: IikG /8lP  
    Sample name:  EDF-C1-56 b6 $,Xh  
    Merging data from file EDF-C1-56 0-0.txt ?q\FLb%"7  
    Finished merging RPC data for sample EDF-C1-56 3^{8_^I  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt )VNM/o%Q  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +T9Q_e*  
    a. 创建一个新的散射库 Vwjk[ DOL  
    b. 散射模型命名 k/%#>  
    c. 改变散射模型为“Tabulated BSDF”. he"L*p*H  
    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 ) q[-|ZA bbr  
    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。 }K2 /&kZ  
    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 Yl $X3wi  
    g. 点击OK 0s1'pA'  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Vzpt(_><  
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    脚本代码 Kl{-zX  
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    '#Language "WWB-COM" X:>$ 8^gS  
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    Option Explicit :4|M jn  
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    Sub Main m+?N7  
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        'Cleanup C\7u<2c  
        ClearOutputWindow() yf!,4SUkU  
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        Print "Merging RPC Photonics BSDF Data Files" u#1%P5r&X  
        SetTextColor(255,0,0) Pg`JQC|  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Ejv%,q/T(  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ]fZ<`w8u}  
        SetTextColor(0,0,0) t-WjL@$F/  
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        'Current directory of this script (should be the same as the text files being merged) %`e`g ^  
        Dim cDir As String PY?8 [A+  
        cDir = MacroDir$ & "\" k'Gw!p}  
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        'Array which will be populated with the list of files to be merged L7]]ZAH!1  
        Dim fList() As String, curFile As String $/+so;KD  
        GetFileList( cDir, fList ) ,of]J|  
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        Print "" 6gnbkpYi  
        Print "Files found for merging:" )n( Q  
        For Each curFile In fList :$?Q D  
            Print Chr(9) & curFile 1_uvoFLk  
        Next L;S}s, 2x  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. >"%ob,c:#  
        Dim nameArray() As String, sampName As String VevNG *  
        nameArray = Split(fList(0)," 0-0.txt") 'f+NW &   
        sampName  = nameArray(0) ; DDe.f"  
        Print "" X P;Bhz3j  
        Print "Sample name: " & Chr(9) & sampName 4/'N|c.  
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        'Open an output file and write the FRED header data pISp*&  
        Dim outFile As String 9cG<hX9`F  
        outFile = cDir & sampName & "_FRED.txt" Lu=O+{*8  
        Open outFile For Output As #1 s5&=Bsv  
        Print #1, "type bsdf_data" hJ f2o  
        Print #1, "format angles=deg bsdf=value scale=1" 9[VxskEh  
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        'Loop the file list, skip the two header lines and write the remaining data to file .po>qb6  
        Dim lineArray() As String, curLine As Long e"k/d<  
        For Each curFile In fList <^8*<;PaG  
            Print "Merging data from file " & curFile "$|Zr  
            ReadFile( cDir & curFile, lineArray ) ?qmp_2:WU  
            For curLine = 2 To UBound(lineArray) +Rwx% =  
                Print #1, lineArray(curLine) E"qFXA>  
            Next j+kC-U;  
        Next kccWoU,  
    8]bz(P#  
        'Close the output file w<NyV8-hL  
        Close #1 xq[Yg15d%  
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        Print "Finished merging RPC data for sample " & sampName ~Y7dH Dn  
        Print "FRED formatted data file: " & Chr(9) & outFile T2=HG Z  
    End Sub @0NJ{  
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    'Utility function to read the contents of a file into an array of strings. N|K4{Frm  
    Function ReadFile(ByVal fileName As String, _ vWjnI*6T#  
                      ByRef lineArray() As String) As Long ,DQjDMjrf  
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        ReadFile = -1 asVX82<  
        Dim oFSO As Object Fky?\ec  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 5MF#&v  
        Erase lineArray ,SUT~oETP  
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        Dim fid As Long @?k J).  
        If oFSO.fileexists( fileName ) Then [ MyE2^  
            fid = FreeFile() 8)j@aiF`  
            Open fileName For Input As fid O )d[8jw"  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) FwG!>  
            Close fid 6RoAl$}'  
        End If `yO'[2  
        Set oFSO = Nothing O.QK"pKD\  
        Return UBound( lineArray ) r!GW= u'  
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    End Function (xpn`NA  
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    Sub GetFileList( ByVal in_dir As String, _ -ijC_`>  
                     ByRef in_flist() As String ) `yiC=$*[  
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        'Redimension the file list array 9902+pW  
        Erase in_flist Fhf<T`  
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        'Tracks how many files are found g>JLDQdc  
        Dim fCount As Long 78 f$6J q  
        fCount = 0 -NJ!g/ >mM  
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        'Recurse directory and search for text files 9=`Wp6Gmn  
        Dim f As String i)a%!1Ar  
        f = Dir$(in_dir & "*.txt") ?)D^~/ A  
        While f <> "" YJV%a  
            ReDim Preserve in_flist(fCount) tc+WWDP#"  
            in_flist(fCount) = f LeOP;#  
            fCount += 1 88s/Q0l  
            f = Dir$() 49H+(*@v@  
        Wend 80OtO#1y  
        ReDim Preserve in_flist(fCount-1) I:cg}JZ>|  
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    End Sub KqY["5p  
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