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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 tgVMgu  
    A/c#2  
    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 ) w1`<7L  
    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。 11((b  
    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。 }WV}in0  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 I'E7mb<2  
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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。 Rz#q68  
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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) dLfB){>S  
    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 Fy$f`w_H@  
    例如下所示: |E9'ii&?B  
    Sample name:  EDF-C1-56 oMNSQMlI  
    Merging data from file EDF-C1-56 0-0.txt [Qqomm.[\w  
    Finished merging RPC data for sample EDF-C1-56 g.*DlD%%  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Nl'@Y^8N  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 we/sv9v}n  
    a. 创建一个新的散射库 .|e8v _2J  
    b. 散射模型命名 =z!^O T6eb  
    c. 改变散射模型为“Tabulated BSDF”. .%EYof  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) B#G:aBCM  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 #\8"d  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 VTa%  
    g. 点击OK 2e9.U/9  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 +# 3e<+!F  
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    脚本代码 FuM:~jv  
    ;pw9+zo ^M  
    '#Language "WWB-COM" L|L;<  
    G*f\ /  
    Option Explicit 5P{[8PZxbV  
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    Sub Main 5ZX  
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        'Cleanup tZG l^mA"g  
        ClearOutputWindow() MD^,"!A  
    U=WS]  
        Print "Merging RPC Photonics BSDF Data Files" PJ YUD5  
        SetTextColor(255,0,0) "~mY4WVG  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." .I?~R:(Ig  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." M1icj~Jr  
        SetTextColor(0,0,0) =4$ErwI_dm  
    4T-"\tmg/  
        'Current directory of this script (should be the same as the text files being merged) c'>_JlG~  
        Dim cDir As String DL<;qhte  
        cDir = MacroDir$ & "\" )$h!lAo  
    JOz4O  
        'Array which will be populated with the list of files to be merged =I aWf  
        Dim fList() As String, curFile As String la}cGZ; p.  
        GetFileList( cDir, fList ) +n<W#O %  
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        Print "" 3RanAT.nu:  
        Print "Files found for merging:"  wX5q=I  
        For Each curFile In fList Z5 p [*LMO  
            Print Chr(9) & curFile  fDloL  
        Next -p?&vQDo`  
    l/,la]!T  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. K9-9 c"cz  
        Dim nameArray() As String, sampName As String p|(SR~;6  
        nameArray = Split(fList(0)," 0-0.txt") _RIlGs\.  
        sampName  = nameArray(0) SK#&%Yk  
        Print "" }i{qRx"4  
        Print "Sample name: " & Chr(9) & sampName zn>+ \  
    ZS%W/.?  
        'Open an output file and write the FRED header data Q:|W/RD~  
        Dim outFile As String z)(W x">  
        outFile = cDir & sampName & "_FRED.txt" IJ~j(.W  
        Open outFile For Output As #1 e=l:!E10  
        Print #1, "type bsdf_data" +TyN;e   
        Print #1, "format angles=deg bsdf=value scale=1" KIcIYCBz  
    BN `2UVH  
        'Loop the file list, skip the two header lines and write the remaining data to file ;*$e8y2  
        Dim lineArray() As String, curLine As Long T9I$6HAi  
        For Each curFile In fList S43JaSw)  
            Print "Merging data from file " & curFile B]H8^  
            ReadFile( cDir & curFile, lineArray ) WQ}wQ:]  
            For curLine = 2 To UBound(lineArray) $4^SWT.  
                Print #1, lineArray(curLine) @gfW*PNjlP  
            Next d!UxFY@  
        Next qDG2rFu&[  
    Gx8!AmeX  
        'Close the output file _-lE$ O  
        Close #1 b*.aaOb  
    n0!2-Q5U)h  
        Print "Finished merging RPC data for sample " & sampName 3C<G8*4);/  
        Print "FRED formatted data file: " & Chr(9) & outFile i%JJ+9N  
    End Sub 2Kf/Id1  
    K2yu}F^}  
    'Utility function to read the contents of a file into an array of strings. p20JU zy  
    Function ReadFile(ByVal fileName As String, _ 2QRO$NieV  
                      ByRef lineArray() As String) As Long |?#JCG  
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        ReadFile = -1 [gpO?'~  
        Dim oFSO As Object +C8O"  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Eamt_/LKf  
        Erase lineArray Z[OX {_2]K  
    9OV@z6  
        Dim fid As Long |$b8(g$s)  
        If oFSO.fileexists( fileName ) Then F_(~b  
            fid = FreeFile()  0U@#&pUc  
            Open fileName For Input As fid !8[T*'LJ-  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2 4+  
            Close fid W~0rSVD$<z  
        End If K^U ="  
        Set oFSO = Nothing B=r DU$z  
        Return UBound( lineArray ) aTTkj\4  
    9zb1t1[ W  
    End Function xy]O8> b  
    >]pZ;e$  
    Sub GetFileList( ByVal in_dir As String, _ mpug#i6q  
                     ByRef in_flist() As String ) gDVsi  
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        'Redimension the file list array Wu^Rv-xA  
        Erase in_flist ?UAuUFueA  
    &F uPd}F  
        'Tracks how many files are found aL4^ po  
        Dim fCount As Long D9[19,2r`  
        fCount = 0 >jsY'Bm  
    {#qUZ z-  
        'Recurse directory and search for text files [M[<'+^*  
        Dim f As String ()IZ7#kL?  
        f = Dir$(in_dir & "*.txt") -0d9,,c  
        While f <> "" v?OVhV  
            ReDim Preserve in_flist(fCount) pE&G]ZC  
            in_flist(fCount) = f qC> tni%  
            fCount += 1 Ohk\P;}  
            f = Dir$() ?"mZb#%  
        Wend J)>DsQ+Cj  
        ReDim Preserve in_flist(fCount-1) B=TUZ)  
    KU,SAcfR7  
    End Sub a]u.Uqyx2w  
     
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