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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 b'O/u."O  
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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 1feVFRx'  
    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。 Aw7N'0K9UN  
    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。 Ox)<"8M  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 T$kuv`?  
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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。 BD"Dzq  
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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) e\}@w1  
    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 Af\@J6viF7  
    例如下所示: 5B%KiE&p  
    Sample name:  EDF-C1-56 Lum=5zDo  
    Merging data from file EDF-C1-56 0-0.txt p4uzw  
    Finished merging RPC data for sample EDF-C1-56 \>\ERVEd  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt :"y2u   
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 c6jVx_tt.  
    a. 创建一个新的散射库 CL7_3^2qI  
    b. 散射模型命名 /Igz[P^\9  
    c. 改变散射模型为“Tabulated BSDF”. ?jmL4V2-f  
    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 ) 2a-]TVL3  
    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。 0=+feB1T  
    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 }>iNT.Lvd  
    g. 点击OK 1#L%Q(G  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 iklZ[G%A0  
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    脚本代码 \Ec*Gq?.  
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    '#Language "WWB-COM" LmY[{.'tX  
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    Option Explicit E\}A<r  
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    Sub Main E;H9]*x/  
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        'Cleanup 3ylSO73R  
        ClearOutputWindow() :/gHqEC24  
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        Print "Merging RPC Photonics BSDF Data Files" i\ uj>;B  
        SetTextColor(255,0,0) V}`ri~  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." GsO(\hR6^  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." I@qGDKz;  
        SetTextColor(0,0,0) qQf NT.  
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        'Current directory of this script (should be the same as the text files being merged) J>M9t%f@  
        Dim cDir As String [zl4"|_`  
        cDir = MacroDir$ & "\" 83]m/Iz  
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        'Array which will be populated with the list of files to be merged ld"rL6  
        Dim fList() As String, curFile As String e2fv%  
        GetFileList( cDir, fList ) "([gN:   
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        Print "" 3zmbx~| =\  
        Print "Files found for merging:" +P 9eE,WR  
        For Each curFile In fList *" OlO}o  
            Print Chr(9) & curFile VL5VYv=:  
        Next eU)QoVt  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?c8( <_I+  
        Dim nameArray() As String, sampName As String )zy ;!  
        nameArray = Split(fList(0)," 0-0.txt") Xhyn! &H5  
        sampName  = nameArray(0) #%%!r$UL  
        Print "" Af@\g-<W_  
        Print "Sample name: " & Chr(9) & sampName Z{t `f[  
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        'Open an output file and write the FRED header data 0s Jp,4Vv  
        Dim outFile As String p,f$9t4  
        outFile = cDir & sampName & "_FRED.txt" : Wtpg   
        Open outFile For Output As #1 ukVBC"Ny  
        Print #1, "type bsdf_data" Xk'Pc0@a  
        Print #1, "format angles=deg bsdf=value scale=1" `<P:l y.  
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        'Loop the file list, skip the two header lines and write the remaining data to file -ON-0L  
        Dim lineArray() As String, curLine As Long 86cnEj=   
        For Each curFile In fList QrFKjmD<  
            Print "Merging data from file " & curFile R'vNJDFY  
            ReadFile( cDir & curFile, lineArray ) R-<8j`[0  
            For curLine = 2 To UBound(lineArray) 1he5Zevm}  
                Print #1, lineArray(curLine) KiFTj$w,  
            Next G=Lg5`3;,  
        Next _E8Cvaob  
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        'Close the output file d@$bPQQ$,  
        Close #1 +Q"~2_q5/;  
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        Print "Finished merging RPC data for sample " & sampName !Ea9 fe  
        Print "FRED formatted data file: " & Chr(9) & outFile O#):*II`9  
    End Sub *_J{_7pwe  
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    'Utility function to read the contents of a file into an array of strings. 3b#L*-  
    Function ReadFile(ByVal fileName As String, _ aO(iKlZ$  
                      ByRef lineArray() As String) As Long 2"shB(:z>  
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        ReadFile = -1 /s+IstW  
        Dim oFSO As Object L^Q;M,.c;  
        Set oFSO = CreateObject("Scripting.FileSystemObject") PJ?C[+&  
        Erase lineArray 5`:d$rv  
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        Dim fid As Long Bxw(pACf  
        If oFSO.fileexists( fileName ) Then yZm=#.f  
            fid = FreeFile() SYf1dbc..u  
            Open fileName For Input As fid ~#P]NWW%.  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) OAiv3"p  
            Close fid gs/ocu  
        End If .p o,.}  
        Set oFSO = Nothing G3]#Du  
        Return UBound( lineArray ) X6(s][Wn  
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    End Function l1O"hd'~s  
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    Sub GetFileList( ByVal in_dir As String, _ djw\%00&#  
                     ByRef in_flist() As String ) >mR8@kob<  
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        'Redimension the file list array ,d*hhe  
        Erase in_flist 3Z me?o*bY  
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        'Tracks how many files are found #,6T.O  
        Dim fCount As Long hOj+z?  
        fCount = 0 XpE847!soL  
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        'Recurse directory and search for text files dVHbIx  
        Dim f As String s0D4K  
        f = Dir$(in_dir & "*.txt") ?Y S 3)  
        While f <> "" g*LD}`X/-  
            ReDim Preserve in_flist(fCount) YOrq)_ l  
            in_flist(fCount) = f '6>*J  
            fCount += 1 G-RDQ  
            f = Dir$() NW 2`)e'  
        Wend z,^~H  
        ReDim Preserve in_flist(fCount-1) hh%?E\qM  
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    End Sub uZ JfIC<>  
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