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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 uTvf[%EHW  
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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 2XyC;RWJ%  
    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。 &?# YjU"  
    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。 g ,yB^^%  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 zC`ediyu  
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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。 G%U!$\j:qd  
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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) 5")BCA  
    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 wsgT`M'J[  
    例如下所示: 'y7<!uo?  
    Sample name:  EDF-C1-56 99~ZZG  
    Merging data from file EDF-C1-56 0-0.txt @%!Gj{   
    Finished merging RPC data for sample EDF-C1-56 3935cxT1U  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt P_(< ?0l  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2[Xe:)d  
    a. 创建一个新的散射库 o<rbC < U  
    b. 散射模型命名 =z'533C  
    c. 改变散射模型为“Tabulated BSDF”. 4F+G;'JV  
    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 ) 1-Q>[Uz,  
    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。 1-PFM-  
    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 ;Bat--K7+  
    g. 点击OK M1I4Ot  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 !X 0 (4^  
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    脚本代码 w[J.?v&^  
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    '#Language "WWB-COM" Tvw(S q};  
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    Option Explicit ._<gc;G  
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    Sub Main soqnr" 1  
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        'Cleanup 10*^  
        ClearOutputWindow() hroRDD   
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        Print "Merging RPC Photonics BSDF Data Files" Jo9c|\4  
        SetTextColor(255,0,0) d{DBG}/Yg  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." .&/A!3pW  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." u HXb=U  
        SetTextColor(0,0,0) Co`:D  
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        'Current directory of this script (should be the same as the text files being merged) vr$z6m ^  
        Dim cDir As String |2&|#K4k^  
        cDir = MacroDir$ & "\" g$mqAz<  
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        'Array which will be populated with the list of files to be merged 2Oy-jM  
        Dim fList() As String, curFile As String \?AA:U*  
        GetFileList( cDir, fList ) )==Qo/N:  
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        Print "" !De U8.%  
        Print "Files found for merging:" /!-ypIY  
        For Each curFile In fList nG"Ae8r  
            Print Chr(9) & curFile QM'>)!8  
        Next s$VLVT*6  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. LdyE*u_  
        Dim nameArray() As String, sampName As String IE&G7\>(yO  
        nameArray = Split(fList(0)," 0-0.txt") _2WIi/6K  
        sampName  = nameArray(0) T4}q%%7l  
        Print "" BF]+fs`  
        Print "Sample name: " & Chr(9) & sampName [?#-JIZ3T  
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        'Open an output file and write the FRED header data vo2TP:  
        Dim outFile As String #^q@ra  
        outFile = cDir & sampName & "_FRED.txt" >{juw&Uu  
        Open outFile For Output As #1 ]j< & :_  
        Print #1, "type bsdf_data" \K(# r=  
        Print #1, "format angles=deg bsdf=value scale=1" 5va ;Ol4  
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        'Loop the file list, skip the two header lines and write the remaining data to file .?.Q[ic  
        Dim lineArray() As String, curLine As Long U &y?3  
        For Each curFile In fList HO;,Ya^l  
            Print "Merging data from file " & curFile i%9xt1c_  
            ReadFile( cDir & curFile, lineArray ) ~ *P9_<  
            For curLine = 2 To UBound(lineArray) cin3)lm  
                Print #1, lineArray(curLine) +K[H! fD  
            Next tNCKL. yU  
        Next ; ,:w % .  
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        'Close the output file P3V }cGZ  
        Close #1 r$-]NYPi  
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        Print "Finished merging RPC data for sample " & sampName (1Ii86EP  
        Print "FRED formatted data file: " & Chr(9) & outFile sxQMfbN  
    End Sub JKs&!!  
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    'Utility function to read the contents of a file into an array of strings. I`EgR?5 `  
    Function ReadFile(ByVal fileName As String, _ XJi^gT N  
                      ByRef lineArray() As String) As Long O.+X,CQG*  
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        ReadFile = -1 .R {P%r  
        Dim oFSO As Object ,]-A~^|  
        Set oFSO = CreateObject("Scripting.FileSystemObject") )NS& 1$  
        Erase lineArray !Ql&Ls  
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        Dim fid As Long \}mn"y  
        If oFSO.fileexists( fileName ) Then JD$;6Jv3P  
            fid = FreeFile() _M7NL^B&  
            Open fileName For Input As fid VcR(9~  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) w97B)Kn6  
            Close fid {V~G r  
        End If J2~oIe2!+  
        Set oFSO = Nothing uSK<{UT~3  
        Return UBound( lineArray ) :0B' b  
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    End Function .\+%Q)?h:  
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    Sub GetFileList( ByVal in_dir As String, _ ]AzDkKj  
                     ByRef in_flist() As String ) w@ =Uf7  
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        'Redimension the file list array \)n'Ywr  
        Erase in_flist xBi``x2eY  
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        'Tracks how many files are found S?Z"){  
        Dim fCount As Long )s4a<S c]  
        fCount = 0 I<ta2<h  
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        'Recurse directory and search for text files 2DTBL:?`  
        Dim f As String p/!P kKJ  
        f = Dir$(in_dir & "*.txt") _ -/<bO  
        While f <> "" ^J Y]w^u  
            ReDim Preserve in_flist(fCount) =HkB>w)h  
            in_flist(fCount) = f -Lbi eS%  
            fCount += 1 gT~Yn~~b  
            f = Dir$() T.p:`}Ma  
        Wend 2k$~Mv@L  
        ReDim Preserve in_flist(fCount-1) s>^$: wzu  
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    End Sub A[O'e  
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