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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 'j6PL;~c  
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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 aL$m  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 br*L|s\P\9  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 aT$q1!U`j2  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 2cY7sE068  
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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。 *|h-iA+9  
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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) RbKAB8  
    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 3U9]&7^  
    例如下所示: Z;M]^?  
    Sample name:  EDF-C1-56 r+-KrO'  
    Merging data from file EDF-C1-56 0-0.txt Pf5RlpL:p  
    Finished merging RPC data for sample EDF-C1-56 |q"WJQ  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt B- =*"H?q  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +h_'hz&HlS  
    a. 创建一个新的散射库 -&I%=0q  
    b. 散射模型命名 p(in.Xz  
    c. 改变散射模型为“Tabulated BSDF”. {|= 8wB  
    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 ) Wly-z$\  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 XP~bmh,T,  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 6"U&i9  
    g. 点击OK [,e[~J`C  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 lp3 A B  
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    脚本代码 c-.t8X,5(~  
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    '#Language "WWB-COM" 0 Po",\^  
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    Option Explicit -f IX6  
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    Sub Main ":E 7#9  
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        'Cleanup m,NUNd#)\  
        ClearOutputWindow() G{ ~pA4  
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        Print "Merging RPC Photonics BSDF Data Files" _Bm/v^(  
        SetTextColor(255,0,0) A@-nn]  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." #D~atgR  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." @ de_|*c  
        SetTextColor(0,0,0) d%VG@./xq  
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        'Current directory of this script (should be the same as the text files being merged) 6KC.l}Y*  
        Dim cDir As String Njsz=  
        cDir = MacroDir$ & "\" <cm,U)j2  
    |!:ImX@  
        'Array which will be populated with the list of files to be merged ~`)`Ip  
        Dim fList() As String, curFile As String -jy- KC  
        GetFileList( cDir, fList ) }mQ7N&cC  
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        Print "" E/z^~;KA  
        Print "Files found for merging:" vn<z\wVbf  
        For Each curFile In fList I} a`11xb`  
            Print Chr(9) & curFile J4 [7*v  
        Next :#W40rUb  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. TD:NL4dm  
        Dim nameArray() As String, sampName As String ?Iy$'am]L  
        nameArray = Split(fList(0)," 0-0.txt") Q`k=VSUk  
        sampName  = nameArray(0) |6/k2d{,(  
        Print "" 5q?2?j/h  
        Print "Sample name: " & Chr(9) & sampName  U, _nEx  
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        'Open an output file and write the FRED header data 6U[`CGL66  
        Dim outFile As String ;BzbWvBo  
        outFile = cDir & sampName & "_FRED.txt" h.CbOI%Q  
        Open outFile For Output As #1 R&}"En`$s  
        Print #1, "type bsdf_data" j f25Ky~  
        Print #1, "format angles=deg bsdf=value scale=1" Y/cnj n  
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        'Loop the file list, skip the two header lines and write the remaining data to file DZo7T!  
        Dim lineArray() As String, curLine As Long G?D7R/0)  
        For Each curFile In fList _)s<E9t2N  
            Print "Merging data from file " & curFile Gq%q x4  
            ReadFile( cDir & curFile, lineArray ) J60XUxf  
            For curLine = 2 To UBound(lineArray) 70bI}/u  
                Print #1, lineArray(curLine) ~ED8]*H|`  
            Next ArWMbT>Zqw  
        Next -U/"eVM  
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        'Close the output file *ue- x!"c  
        Close #1 \HX'^t`  
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        Print "Finished merging RPC data for sample " & sampName xVk|6vA7  
        Print "FRED formatted data file: " & Chr(9) & outFile wBz?OnD/D  
    End Sub XFpII4 5  
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    'Utility function to read the contents of a file into an array of strings. !$&k@#v:  
    Function ReadFile(ByVal fileName As String, _ u!I Es  
                      ByRef lineArray() As String) As Long +>3XJlZV  
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        ReadFile = -1 7u[U%yd  
        Dim oFSO As Object (iub\`  
        Set oFSO = CreateObject("Scripting.FileSystemObject") '&/ 35d9|*  
        Erase lineArray A9Cq(L_H  
    }  IJ  
        Dim fid As Long {A2EGUmF2  
        If oFSO.fileexists( fileName ) Then $|+q9 o\  
            fid = FreeFile() #ra"(/)  
            Open fileName For Input As fid ]WlE9z7:8  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) HKu? J  
            Close fid Q9,H 0r-%  
        End If k#mQLv  
        Set oFSO = Nothing )I7~ <$w  
        Return UBound( lineArray ) 0>@D{_}s  
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    End Function B*=m%NXf  
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    Sub GetFileList( ByVal in_dir As String, _ o,o,(sII  
                     ByRef in_flist() As String ) Uedzt  
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        'Redimension the file list array pxm{?eBz  
        Erase in_flist UjCQ W:[  
    &5JTcMC^  
        'Tracks how many files are found lmmB=F  
        Dim fCount As Long Gk~QgD/Pix  
        fCount = 0 q\+khy,k  
    M"cB6{st[  
        'Recurse directory and search for text files qm RdO R  
        Dim f As String W(jXOgs+_  
        f = Dir$(in_dir & "*.txt") ,/{(8hn  
        While f <> "" mqw5\7s?  
            ReDim Preserve in_flist(fCount) kb"g  
            in_flist(fCount) = f qg521o$*  
            fCount += 1 h#_KO-#.[  
            f = Dir$() $|J16tW  
        Wend /u hA\m(  
        ReDim Preserve in_flist(fCount-1) b.=bgRV2{x  
    " S8JHHx  
    End Sub 06hzCWm#  
     
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