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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 iG-N  
    VK4/82@5  
    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 tp+=0k2i  
    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。 M:|/ijp N  
    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。 /co%:}ln  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 UPO^V:.R4  
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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。 ewQe/Fq  
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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) 0BXs&i-TP5  
    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 A\g%  
    例如下所示: vzy!3Hiw  
    Sample name:  EDF-C1-56 Y-~;E3(  
    Merging data from file EDF-C1-56 0-0.txt uQ1jwYK`7  
    Finished merging RPC data for sample EDF-C1-56 E0jUewG  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt "G kI5!  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 xN "wF-s4?  
    a. 创建一个新的散射库 `oPLl0  
    b. 散射模型命名 O\JD,w  
    c. 改变散射模型为“Tabulated BSDF”. m+7`\|`jQ  
    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 ) T^NJ4L4#  
    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。 9<Ag1l  
    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 TK %< a/  
    g. 点击OK id4]|jb  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 F,.Q|.nN  
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    脚本代码 N1s.3`  
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    '#Language "WWB-COM" c.-cpFk^L&  
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    Option Explicit iP,v=pS6  
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    Sub Main &/DOO ^  
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        'Cleanup 8.-S$^hj~6  
        ClearOutputWindow() &58 {  
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        Print "Merging RPC Photonics BSDF Data Files" ;x16shH  
        SetTextColor(255,0,0) K+-zY[3  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." H}a)^90_  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." n5>B LtY  
        SetTextColor(0,0,0) _y"a2M  
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        'Current directory of this script (should be the same as the text files being merged) " Ac~2<V  
        Dim cDir As String ZGzc"r(r:#  
        cDir = MacroDir$ & "\" d[" x= [f  
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        'Array which will be populated with the list of files to be merged 1oB$u!6P  
        Dim fList() As String, curFile As String *F|i&2  
        GetFileList( cDir, fList ) /t$*W\PL@  
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        Print "" >^ ;(c4C  
        Print "Files found for merging:" r:.6"VQu}  
        For Each curFile In fList "B~WcC  
            Print Chr(9) & curFile yW{mK  
        Next NQg'|Pt(%  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. U-1VnX9m  
        Dim nameArray() As String, sampName As String a" ^#!G<+  
        nameArray = Split(fList(0)," 0-0.txt") QYH."7X >  
        sampName  = nameArray(0) u*U_7Uw$  
        Print "" LH,]vuXh  
        Print "Sample name: " & Chr(9) & sampName ,T/GW,?  
    "2%y~jrDN  
        'Open an output file and write the FRED header data r)c+".0d^  
        Dim outFile As String {[my"n 2  
        outFile = cDir & sampName & "_FRED.txt" F68},N>vr@  
        Open outFile For Output As #1 F:M/z#:~  
        Print #1, "type bsdf_data" :&qC<UD  
        Print #1, "format angles=deg bsdf=value scale=1" 5"$e=y/  
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        'Loop the file list, skip the two header lines and write the remaining data to file ]&' jP  
        Dim lineArray() As String, curLine As Long F9v)R #u~  
        For Each curFile In fList =obt"K%n  
            Print "Merging data from file " & curFile ?ISI[hoc  
            ReadFile( cDir & curFile, lineArray ) ;,mBT[_ZO  
            For curLine = 2 To UBound(lineArray) W;q#ZD(;  
                Print #1, lineArray(curLine) 8I<_w4fC  
            Next =jsx (3V   
        Next YGfA qI y  
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        'Close the output file yB 1I53E  
        Close #1 zoR,RBU6  
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        Print "Finished merging RPC data for sample " & sampName BN_!Y)F l  
        Print "FRED formatted data file: " & Chr(9) & outFile <zfO1~^  
    End Sub b=V)?"e-  
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    'Utility function to read the contents of a file into an array of strings. mgk64}K[n  
    Function ReadFile(ByVal fileName As String, _ r(PJ~8)(=  
                      ByRef lineArray() As String) As Long Z`^ K%P=  
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        ReadFile = -1 v!nm &"  
        Dim oFSO As Object _e;N'DZ  
        Set oFSO = CreateObject("Scripting.FileSystemObject") H<v c\r  
        Erase lineArray -[G/2F'  
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        Dim fid As Long j@%K*Gb`  
        If oFSO.fileexists( fileName ) Then Fsnw3/Nr  
            fid = FreeFile() 7^n,Ti g  
            Open fileName For Input As fid Z'voCWCd  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ;%v%K+}r  
            Close fid Tbe_x s^  
        End If ac2}3 $u  
        Set oFSO = Nothing C}x4#bNK  
        Return UBound( lineArray ) ]R97n|s_  
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    End Function #k"1wSx16  
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    Sub GetFileList( ByVal in_dir As String, _ 71K\.[ =-  
                     ByRef in_flist() As String ) jXc5fXO N  
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        'Redimension the file list array }T?i%l  
        Erase in_flist XMjI}SPG  
    !O 0ZD4/{4  
        'Tracks how many files are found *5ka.=Qs  
        Dim fCount As Long Yt\E/*%  
        fCount = 0 6^7)GCq [  
    c.|sW2/  
        'Recurse directory and search for text files -0=}|$H.  
        Dim f As String =g{_^^n  
        f = Dir$(in_dir & "*.txt") >qSO,$  
        While f <> "" q$e T!'x  
            ReDim Preserve in_flist(fCount) O JZ!|J8?  
            in_flist(fCount) = f BsoFQw4$9  
            fCount += 1 7AZ5%o  
            f = Dir$() AlPL;^Y_l  
        Wend  9'L1KQ  
        ReDim Preserve in_flist(fCount-1) O[i2A (  
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    End Sub eukX#0/^  
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