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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 ExeD3Zj  
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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 =e](eA;  
    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。 njtz,qt_;G  
    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\>+!Vq  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 $nF|n+m  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 FM;NA{  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) nNz1gV:0X  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 E-IVv  
    例如下所示: S "'0l S   
    Sample name:  EDF-C1-56 "BT*9N=|  
    Merging data from file EDF-C1-56 0-0.txt O2;FaASF  
    Finished merging RPC data for sample EDF-C1-56 ,% "!8T  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt /4/'&tY  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 *;t\!XDgp  
    a. 创建一个新的散射库 *o.f<OwOz  
    b. 散射模型命名 hb#Nm6  
    c. 改变散射模型为“Tabulated BSDF”. 86Hg?!<i.  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) /N= }wC  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 E! d?@Xr@  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 lC/1,Z/M  
    g. 点击OK 5;'(^z-bL  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ]8q#@%v }  
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    脚本代码 WoM;)Q  
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    '#Language "WWB-COM" p 4_j>JPv5  
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    Option Explicit %O6r  
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    Sub Main ^POHQQ  
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        'Cleanup -V g(aD  
        ClearOutputWindow() 4> k"$l/:  
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        Print "Merging RPC Photonics BSDF Data Files" ICck 0S!  
        SetTextColor(255,0,0) RO+ jVY~H-  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ! Gob `# r  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." DW( /[jo\  
        SetTextColor(0,0,0) Gyx4}pV  
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        'Current directory of this script (should be the same as the text files being merged) 4>^LEp  
        Dim cDir As String !/nXEjW?  
        cDir = MacroDir$ & "\" 37apOK4+  
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        'Array which will be populated with the list of files to be merged aVB/Co M9  
        Dim fList() As String, curFile As String #[ f]-c(!  
        GetFileList( cDir, fList ) Z(j"\d!y  
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        Print "" ^'9.VVyz  
        Print "Files found for merging:" PRJ  
        For Each curFile In fList UQZl:DYa  
            Print Chr(9) & curFile +*RaX (&  
        Next e5RF6roxO  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. j,n\`7dD$  
        Dim nameArray() As String, sampName As String O22Q g  
        nameArray = Split(fList(0)," 0-0.txt") )ifjK6*  
        sampName  = nameArray(0) Qb%o%z?hee  
        Print "" p{ Xde   
        Print "Sample name: " & Chr(9) & sampName }7non  
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        'Open an output file and write the FRED header data fj|b;8_}l  
        Dim outFile As String M*!WXQlud  
        outFile = cDir & sampName & "_FRED.txt"  `j1oxJm  
        Open outFile For Output As #1 }y%c.  
        Print #1, "type bsdf_data" BLN|QaZ  
        Print #1, "format angles=deg bsdf=value scale=1" Y~ xo=v(  
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        'Loop the file list, skip the two header lines and write the remaining data to file Gv[s86AP,  
        Dim lineArray() As String, curLine As Long pMHF u/|Pr  
        For Each curFile In fList _aeIK  
            Print "Merging data from file " & curFile 1 |  
            ReadFile( cDir & curFile, lineArray ) 8`<e\g7-  
            For curLine = 2 To UBound(lineArray) @)\4 $#+-  
                Print #1, lineArray(curLine) "1YwV~M5  
            Next fB80&G9  
        Next 3k3 C\Cw  
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        'Close the output file O 1D|T"@  
        Close #1 P_4E<"eK  
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        Print "Finished merging RPC data for sample " & sampName ,ZghV1z  
        Print "FRED formatted data file: " & Chr(9) & outFile 6hMKAk  
    End Sub 2E8G 5?qe)  
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    'Utility function to read the contents of a file into an array of strings. }DQTy.d;P  
    Function ReadFile(ByVal fileName As String, _ OlB9z  
                      ByRef lineArray() As String) As Long o%bf7)~s  
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        ReadFile = -1 k#bG&BF  
        Dim oFSO As Object WkiPrQ0]:  
        Set oFSO = CreateObject("Scripting.FileSystemObject") lJ]]FuA-Q  
        Erase lineArray %s497'  
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        Dim fid As Long 0-~s0R89A  
        If oFSO.fileexists( fileName ) Then X%)~i[_DV  
            fid = FreeFile() ^,0Lr$+  
            Open fileName For Input As fid (dZ]j){  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Vm8@ LA  
            Close fid CT5s`v!s  
        End If oYdE s&qq  
        Set oFSO = Nothing $*VZa3B\  
        Return UBound( lineArray ) T/A2Y+@N;  
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    End Function IU<lF)PF$  
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    Sub GetFileList( ByVal in_dir As String, _ :hT.L3n,  
                     ByRef in_flist() As String ) c<,LE@ V  
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        'Redimension the file list array ]J[d8S5  
        Erase in_flist .uVd'  
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        'Tracks how many files are found _Dd>e=v  
        Dim fCount As Long Um}AV  
        fCount = 0 OLPY<ax  
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        'Recurse directory and search for text files O2\(:tvw  
        Dim f As String JO`r)_  
        f = Dir$(in_dir & "*.txt") ~+j2a3rv-{  
        While f <> "" #CPLvg#  
            ReDim Preserve in_flist(fCount) >s 6ye  
            in_flist(fCount) = f &e6UEG  
            fCount += 1 rf-yUH]&S  
            f = Dir$() r<vy6  
        Wend q\}+]|nGs  
        ReDim Preserve in_flist(fCount-1) i(pHJP:a:  
    ]+46r!r|  
    End Sub x&*f5Y9hCi  
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