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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 et]*5Y6  
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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 c\4n7m,y  
    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。 Bv@m)$9\+3  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 HNuwq\w  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 PvT8XSlTx!  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 pr0V)C6  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) {Rj'=%h  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 TcfBfscU  
    例如下所示: -;`W"&`ss  
    Sample name:  EDF-C1-56 ?s"v0cg+  
    Merging data from file EDF-C1-56 0-0.txt #1bgV  
    Finished merging RPC data for sample EDF-C1-56 }5tn  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Eq<#pX6  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 0RSa{iS*A  
    a. 创建一个新的散射库 C aJD*  
    b. 散射模型命名 2aje$w-  
    c. 改变散射模型为“Tabulated BSDF”. nG%j4r ;  
    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 ) -X}R(.}x  
    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。 ]VYl Eqe  
    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 a@jP^VVk  
    g. 点击OK !Z'm@,+  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 M7> \Qk  
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    脚本代码 L2h+[f  
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    '#Language "WWB-COM" F_Pd\Aq8  
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    Option Explicit 86I*  
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    Sub Main Go67VqJr  
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        'Cleanup kv4J@  
        ClearOutputWindow() B&$89]gs|  
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        Print "Merging RPC Photonics BSDF Data Files" _/=ZkI5  
        SetTextColor(255,0,0) 0Yjy  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." PYf`a`dH  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." )yK!qu  
        SetTextColor(0,0,0) -?'CUm*Od  
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        'Current directory of this script (should be the same as the text files being merged) `3:%F>  
        Dim cDir As String D_)vGvv3;.  
        cDir = MacroDir$ & "\" uR%H"f  
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        'Array which will be populated with the list of files to be merged fytx({I .a  
        Dim fList() As String, curFile As String ,'673PR  
        GetFileList( cDir, fList ) .0|J+D  
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        Print "" /YbL{G )j}  
        Print "Files found for merging:" E)E!  
        For Each curFile In fList w8i!Qi#y5D  
            Print Chr(9) & curFile Z%R%D*f@y  
        Next gZUy0`E  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. $S}x'F!4_  
        Dim nameArray() As String, sampName As String VfwD{+ 5  
        nameArray = Split(fList(0)," 0-0.txt") ;R!H\  
        sampName  = nameArray(0) p o`$^TB^+  
        Print "" XL3h ; $,  
        Print "Sample name: " & Chr(9) & sampName K0g:Q*J-  
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        'Open an output file and write the FRED header data jb2:O,+!  
        Dim outFile As String [s2V-'2  
        outFile = cDir & sampName & "_FRED.txt" q': wSu u  
        Open outFile For Output As #1 kI'A` /B l  
        Print #1, "type bsdf_data" M::iU_  
        Print #1, "format angles=deg bsdf=value scale=1" 9gg,Dy  
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        'Loop the file list, skip the two header lines and write the remaining data to file \G@6jn1G(  
        Dim lineArray() As String, curLine As Long d"UW38K{  
        For Each curFile In fList ,]mwk~HeF  
            Print "Merging data from file " & curFile | dwxea  
            ReadFile( cDir & curFile, lineArray ) n4 @a`lN5g  
            For curLine = 2 To UBound(lineArray) jZ!JXmVV  
                Print #1, lineArray(curLine) '5U$`Xe1  
            Next SEIu4 l$E  
        Next Y(zN  
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        'Close the output file ^^SfIK?p  
        Close #1 !f-o,RJ  
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        Print "Finished merging RPC data for sample " & sampName 8!GLw-kb  
        Print "FRED formatted data file: " & Chr(9) & outFile tJPRR_nZv  
    End Sub ]P$DAi   
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    'Utility function to read the contents of a file into an array of strings. N08n/u&cr,  
    Function ReadFile(ByVal fileName As String, _ Ne7{{1  
                      ByRef lineArray() As String) As Long }GDG$QI]K&  
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        ReadFile = -1 NCFV  
        Dim oFSO As Object ; ,<J:%s  
        Set oFSO = CreateObject("Scripting.FileSystemObject") S "Pj 1  
        Erase lineArray v|(b,J3  
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        Dim fid As Long jYX9; C;J  
        If oFSO.fileexists( fileName ) Then OX/.v?c  
            fid = FreeFile() '5/}MMT  
            Open fileName For Input As fid BkxhF  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) DS}rFU  
            Close fid u^zitW!X$  
        End If X,+}syK  
        Set oFSO = Nothing _|B&v  
        Return UBound( lineArray ) y32++b!  
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    End Function u7&'3ef  
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    Sub GetFileList( ByVal in_dir As String, _ oz6+rM6MY  
                     ByRef in_flist() As String ) YG~ o  
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        'Redimension the file list array (Q8 ?)  
        Erase in_flist -wQ^oOJ  
    #S%Y; ilq  
        'Tracks how many files are found `uZv9I"  
        Dim fCount As Long +`zi>=  
        fCount = 0 9m !!b{  
    Z/kaRnG[@t  
        'Recurse directory and search for text files 1DLG]-j}  
        Dim f As String ioNa~F&  
        f = Dir$(in_dir & "*.txt") Jrd4a~XP  
        While f <> "" `m 3QT3B  
            ReDim Preserve in_flist(fCount) >2CusT2  
            in_flist(fCount) = f A1QI4.K  
            fCount += 1 QrckTO  
            f = Dir$() Wt9iL  
        Wend RC{Z)M{~  
        ReDim Preserve in_flist(fCount-1) aZjef  
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    End Sub 04guud }  
     
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