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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 0 It[Pa qG  
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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 :J 7p=sX  
    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。 ].A>ORS/  
    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。 a>_Cxsb&`  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 'N7AVj  
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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。 (toN? ?r  
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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) #3+-vyZm  
    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 K6 {0`'x  
    例如下所示: %-A#7\  
    Sample name:  EDF-C1-56 b*AL,n?  
    Merging data from file EDF-C1-56 0-0.txt 2 c%*u {=:  
    Finished merging RPC data for sample EDF-C1-56 y*f 5_  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt |afzW=8'  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ZRD@8'1p  
    a. 创建一个新的散射库 r@|{mQOxa  
    b. 散射模型命名 =7*k>]o  
    c. 改变散射模型为“Tabulated BSDF”. !yfQ^a_ O  
    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 ) gG>|5R0  
    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。 iJ7?6)\  
    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 &*w)/W  
    g. 点击OK g_T[m*  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Q\!0V@$  
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    脚本代码 GfG!CG^ %  
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    '#Language "WWB-COM" O<H5W|cM  
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    Option Explicit >f !  
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    Sub Main Fq-A vU  
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        'Cleanup bPe|/wp  
        ClearOutputWindow() ^hMJNy&R  
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        Print "Merging RPC Photonics BSDF Data Files" mvCH$}w8&  
        SetTextColor(255,0,0) RKt#2%FFO  
        Print "Note: Script should be located in the same folder as the BSDF TXT files."  hxedQvW  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." aYmC LLj  
        SetTextColor(0,0,0) }u CC~ <^  
    ;I#f:UQ  
        'Current directory of this script (should be the same as the text files being merged) :*/'W5iM  
        Dim cDir As String p>O>^R  
        cDir = MacroDir$ & "\" H J8rb  
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        'Array which will be populated with the list of files to be merged AWXBk+  
        Dim fList() As String, curFile As String C `>1x`n  
        GetFileList( cDir, fList ) \?|FB~.Ry  
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        Print "" z-Ndv;:  
        Print "Files found for merging:" X=W.{?  
        For Each curFile In fList ]:6M!+?(  
            Print Chr(9) & curFile `L. kyL  
        Next 2brxV'tk  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. +TWk}#G   
        Dim nameArray() As String, sampName As String $4&%<'l3I  
        nameArray = Split(fList(0)," 0-0.txt") k4AF .U`I  
        sampName  = nameArray(0) y\xa<!:g  
        Print "" ??7c9l5,  
        Print "Sample name: " & Chr(9) & sampName ?Ji nX'z  
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        'Open an output file and write the FRED header data bH7 lUS~  
        Dim outFile As String q0>@!1Wb  
        outFile = cDir & sampName & "_FRED.txt" P`HDQ/^O  
        Open outFile For Output As #1 `F^~*FnR,B  
        Print #1, "type bsdf_data" wS)2ymRg  
        Print #1, "format angles=deg bsdf=value scale=1" 9CxFj)#5F  
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        'Loop the file list, skip the two header lines and write the remaining data to file }%@q; "9`  
        Dim lineArray() As String, curLine As Long gZ^'hW-{  
        For Each curFile In fList  s_p\ bl.  
            Print "Merging data from file " & curFile h3<L,Olp  
            ReadFile( cDir & curFile, lineArray ) S]O0zv^}  
            For curLine = 2 To UBound(lineArray) a9"1a'  
                Print #1, lineArray(curLine) zD9gE  
            Next Kz>Bw;R(  
        Next Y]33:c_;Mo  
    'Y%@fZf x  
        'Close the output file =u.jZ*u]WT  
        Close #1 ,8Yc@P_O  
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        Print "Finished merging RPC data for sample " & sampName j$5S_]2  
        Print "FRED formatted data file: " & Chr(9) & outFile qpCNvhi  
    End Sub JJ+A+sfdk  
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    'Utility function to read the contents of a file into an array of strings. C~ r(*nr  
    Function ReadFile(ByVal fileName As String, _ a  St  
                      ByRef lineArray() As String) As Long /|HVp  
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        ReadFile = -1 NY,ZTl_  
        Dim oFSO As Object oQS_rv\Ber  
        Set oFSO = CreateObject("Scripting.FileSystemObject") /p PSo  
        Erase lineArray q5UD!& W  
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        Dim fid As Long a*g7uaoP  
        If oFSO.fileexists( fileName ) Then 6 #vc"5@M  
            fid = FreeFile() 8F;f&&L"y  
            Open fileName For Input As fid &-h z&/A,  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 6~rO(  
            Close fid !SxZN dv  
        End If W7 .Y`u[  
        Set oFSO = Nothing |_ADG  
        Return UBound( lineArray ) f0h^ULd  
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    End Function p[J 8 r{'  
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    Sub GetFileList( ByVal in_dir As String, _ J,&B   
                     ByRef in_flist() As String ) NF0=t}e  
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        'Redimension the file list array 0)^$9 Z  
        Erase in_flist {$ (X,E  
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        'Tracks how many files are found yW!+:y_N_  
        Dim fCount As Long d${RZ}/  
        fCount = 0 D rMG{Yiu  
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        'Recurse directory and search for text files KBO{ g:"  
        Dim f As String ]-D&/88``  
        f = Dir$(in_dir & "*.txt") 4P(ysTuM  
        While f <> "" ?;c&5'7ct  
            ReDim Preserve in_flist(fCount) CL%+`c0  
            in_flist(fCount) = f 3ZhB 8 P  
            fCount += 1 DClV&\i=o  
            f = Dir$() &AS<2hB  
        Wend Z`9yGaTO  
        ReDim Preserve in_flist(fCount-1) j&qJK,~  
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    End Sub `Qrrnq  
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