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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 SzXR],dA  
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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 vo (riHH  
    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。 "qh~wKJ  
    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。 m4\e `nl  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 65]>6D43  
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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。 E)>.2{]C>  
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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) Hnft1   
    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 t]gZ^5  
    例如下所示: ]C'^&:&<  
    Sample name:  EDF-C1-56 +L0Jje>Az  
    Merging data from file EDF-C1-56 0-0.txt Q6PaT@gs  
    Finished merging RPC data for sample EDF-C1-56 :MaP58dhh  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt w`YN#G  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 M "\Iw'5$  
    a. 创建一个新的散射库 q!;u4J  
    b. 散射模型命名 :_8Nf1B+T  
    c. 改变散射模型为“Tabulated BSDF”. F:7 d}Jx  
    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 ) jWL%*dJrN  
    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。 {k}$L|w  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 8/vGA=  
    g. 点击OK z{H=;"+rh  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 mV'-1  
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    脚本代码 P(%^J6[>  
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    '#Language "WWB-COM" 0fJz[;dV>n  
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    Option Explicit 8-B6D~i  
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    Sub Main &j}:8Tst  
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        'Cleanup icK$W2<8mg  
        ClearOutputWindow() ^ 0.`1$  
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        Print "Merging RPC Photonics BSDF Data Files" :i3 W U%  
        SetTextColor(255,0,0) 8kLHQ0pmu  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 7#&e0fw/I  
        Print "Note: Do not run this script multiple times without deleting the output file between executions."  "F=ta  
        SetTextColor(0,0,0) Z'UhJuD5  
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        'Current directory of this script (should be the same as the text files being merged) vRh)o1u)  
        Dim cDir As String cJE4uL<  
        cDir = MacroDir$ & "\" XL7||9,(h  
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        'Array which will be populated with the list of files to be merged + )n}n5  
        Dim fList() As String, curFile As String !bIE%cq  
        GetFileList( cDir, fList ) Mt4*`CxtH;  
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        Print "" I5@8=rFk  
        Print "Files found for merging:" "m%EFWUOl  
        For Each curFile In fList d#HlO}  
            Print Chr(9) & curFile G<-<>)zO!  
        Next X[!S7[d-y  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3bRW]mP8  
        Dim nameArray() As String, sampName As String Cg(&WJw(ep  
        nameArray = Split(fList(0)," 0-0.txt") sXmP<c  
        sampName  = nameArray(0) ?bPW*A82{q  
        Print "" &5[B\yv  
        Print "Sample name: " & Chr(9) & sampName '#C5m#v  
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        'Open an output file and write the FRED header data D*>#]0X  
        Dim outFile As String 6zi 5#23  
        outFile = cDir & sampName & "_FRED.txt" |- <72$j  
        Open outFile For Output As #1 0|<9eD\I=  
        Print #1, "type bsdf_data" Z~w2m6;s  
        Print #1, "format angles=deg bsdf=value scale=1" g[*"LOw  
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        'Loop the file list, skip the two header lines and write the remaining data to file "G^TA:O:=  
        Dim lineArray() As String, curLine As Long 0(>3L:  
        For Each curFile In fList h=qT@)h1>  
            Print "Merging data from file " & curFile 6L;]5)#  
            ReadFile( cDir & curFile, lineArray ) &>!-67  
            For curLine = 2 To UBound(lineArray)  Cmp5or6d  
                Print #1, lineArray(curLine) O^PN{u  
            Next )FSEHQ  
        Next /ykc`E?f  
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        'Close the output file rog1  
        Close #1 [mQdc?n\  
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        Print "Finished merging RPC data for sample " & sampName mE=Ur  
        Print "FRED formatted data file: " & Chr(9) & outFile N/'8W9#6  
    End Sub +f%"O?  
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    'Utility function to read the contents of a file into an array of strings. w+r).PS}C  
    Function ReadFile(ByVal fileName As String, _ r\cY R}v  
                      ByRef lineArray() As String) As Long G[*z,2Kb>  
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        ReadFile = -1 f5p/cUzX  
        Dim oFSO As Object %|%eGidu  
        Set oFSO = CreateObject("Scripting.FileSystemObject") oHr0;4Lg6  
        Erase lineArray t\h4-dJn  
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        Dim fid As Long 2;j<{'  
        If oFSO.fileexists( fileName ) Then V= -  
            fid = FreeFile() *dxm|F98  
            Open fileName For Input As fid ^BM !TQ%!  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) -Lq2K3JHyn  
            Close fid cly}[<w!  
        End If '9=b@SaAj  
        Set oFSO = Nothing ,q>cFsY=i?  
        Return UBound( lineArray ) jO/cdLKX(  
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    End Function :|$cG~'J  
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    Sub GetFileList( ByVal in_dir As String, _ /G|v.#2/g  
                     ByRef in_flist() As String ) "*t0 t  
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        'Redimension the file list array K a& 2>F  
        Erase in_flist ]jY^*o[  
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        'Tracks how many files are found w@&z0ODJ  
        Dim fCount As Long Y9|!= T%  
        fCount = 0 i39ZBs@  
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        'Recurse directory and search for text files wV iTMlq  
        Dim f As String [\#ANA"  
        f = Dir$(in_dir & "*.txt") .d r Y  
        While f <> "" w/O'&],x  
            ReDim Preserve in_flist(fCount) %8 D>aS U  
            in_flist(fCount) = f 39hep8+  
            fCount += 1 4# PxJG6m  
            f = Dir$() t$%<eF@w  
        Wend ,(a~vqNQW3  
        ReDim Preserve in_flist(fCount-1) [qW%H,_  
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    End Sub Q(cLi:)X2  
     
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