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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 y fS  
    S +73 /Vs  
    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 odcrP\S  
    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。 .b*-GWx  
    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。 pek5P4W_  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 r_a1oO:  
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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。 .$x822   
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ,n5 [Y)  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 5bK:sht  
    例如下所示: =PBJ+"DQs  
    Sample name:  EDF-C1-56 '_=XfTF  
    Merging data from file EDF-C1-56 0-0.txt "0"8Rp&V|  
    Finished merging RPC data for sample EDF-C1-56 = 6w(9O  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt BS3BJwf; f  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 i6h0_q8 >  
    a. 创建一个新的散射库 DGAg#jh  
    b. 散射模型命名 TU8K\;l]  
    c. 改变散射模型为“Tabulated BSDF”. N;,N6&veK/  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) E[_-s  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 v[ y|E;B  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 !.={p8X-x  
    g. 点击OK W.b?~  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 TlBu3z'P  
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    脚本代码 xF9PjnWF=  
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    '#Language "WWB-COM" +@oo8io  
    [SLBA_d  
    Option Explicit _UeIzdV9  
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    Sub Main )N&v. w  
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        'Cleanup ^Ul *Nm  
        ClearOutputWindow() [+$o`0q;N?  
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        Print "Merging RPC Photonics BSDF Data Files" (kI@U![u  
        SetTextColor(255,0,0) ~rU{Q>c  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." QVrMrm+vRv  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ze%)fZI0f  
        SetTextColor(0,0,0) J $<g" z3  
    5/{gY{  
        'Current directory of this script (should be the same as the text files being merged) )wY bcH  
        Dim cDir As String 1G+ ?/w  
        cDir = MacroDir$ & "\" ep"54o5=d  
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        'Array which will be populated with the list of files to be merged bQM_rqjJGw  
        Dim fList() As String, curFile As String 3~!PJI1  
        GetFileList( cDir, fList ) 9Ic~F^  
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        Print "" @oL<Ioh  
        Print "Files found for merging:" XmoS$ /#"  
        For Each curFile In fList bMw)> 4  
            Print Chr(9) & curFile PUViTb  
        Next ` 5Qo*qx  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 8.Ty ,7Z  
        Dim nameArray() As String, sampName As String M9b_Q  
        nameArray = Split(fList(0)," 0-0.txt") L$+ap~ld  
        sampName  = nameArray(0) q y8=4~40  
        Print "" aTy&"  
        Print "Sample name: " & Chr(9) & sampName P1 `-OM  
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        'Open an output file and write the FRED header data =r:-CRq(  
        Dim outFile As String 7L:$Amb_F  
        outFile = cDir & sampName & "_FRED.txt" pJ#R :#P  
        Open outFile For Output As #1 ,2%>e"%  
        Print #1, "type bsdf_data" uNYHEs6%T$  
        Print #1, "format angles=deg bsdf=value scale=1" B6b {hsO  
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        'Loop the file list, skip the two header lines and write the remaining data to file [Hww3+~+  
        Dim lineArray() As String, curLine As Long tXTa>Q  
        For Each curFile In fList =e,2/Ep{i  
            Print "Merging data from file " & curFile 5sq#bvfJ o  
            ReadFile( cDir & curFile, lineArray ) G =+sW  
            For curLine = 2 To UBound(lineArray) a[GlqaQy+-  
                Print #1, lineArray(curLine) B/Lx,  
            Next NY ZPh%x  
        Next r,x;q  
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        'Close the output file 'N0/;k0ax  
        Close #1 E0}jEl/{  
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        Print "Finished merging RPC data for sample " & sampName }_L@CpG  
        Print "FRED formatted data file: " & Chr(9) & outFile V< @]Iv  
    End Sub X] /r'Tz  
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    'Utility function to read the contents of a file into an array of strings. KutR l$,  
    Function ReadFile(ByVal fileName As String, _ C/+8lA6NV  
                      ByRef lineArray() As String) As Long jv]:`$}G\  
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        ReadFile = -1 #{l+I( M  
        Dim oFSO As Object G~e`O,+  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Ng,#d`Br  
        Erase lineArray *"Ipu"G5?  
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        Dim fid As Long 9\i,3:Qc  
        If oFSO.fileexists( fileName ) Then R gEKs"e  
            fid = FreeFile() d]k >7.  
            Open fileName For Input As fid Kl$!_$  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) *IGgbg[0  
            Close fid K{HRjNda#  
        End If - iS\3P.  
        Set oFSO = Nothing 8+uwzBNZ:  
        Return UBound( lineArray ) 0@t/j<5o  
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    End Function ewk62 {  
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    Sub GetFileList( ByVal in_dir As String, _ pscCXk(|A`  
                     ByRef in_flist() As String ) fdN-Zq@'  
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        'Redimension the file list array PZR pH  
        Erase in_flist V2'(}k  
    ^Yn{Vi2.  
        'Tracks how many files are found 7k:}9M~  
        Dim fCount As Long jpaY:fcF  
        fCount = 0 Y'Jb@l`$-  
    d;(L@9HHD  
        'Recurse directory and search for text files oHbEHS61  
        Dim f As String !w98 [BE7  
        f = Dir$(in_dir & "*.txt") a)[XJLCQ  
        While f <> "" gNzQ"W=  
            ReDim Preserve in_flist(fCount) X1i6CEa<  
            in_flist(fCount) = f zie])_8|h  
            fCount += 1 JMOQDo  
            f = Dir$() xZL`<3?  
        Wend !/['wv@  
        ReDim Preserve in_flist(fCount-1) uyxU>yHV<g  
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    End Sub j 46f Q  
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