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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 T)ISDK4>S"  
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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 dI!/H&`B]  
    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。 S a}P |qI  
    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。 {:Kr't<XzF  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ?a1pO#{Dg  
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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。 C46jVl   
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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) dT (i*E\j  
    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 !?+q7U  
    例如下所示: ~-R2mAUK  
    Sample name:  EDF-C1-56 !aL=R)G&e  
    Merging data from file EDF-C1-56 0-0.txt <vD(,||  
    Finished merging RPC data for sample EDF-C1-56 p(Osz7K  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt |f.,fVVV;  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 h@y>QhYU0  
    a. 创建一个新的散射库 (=EDqAZg  
    b. 散射模型命名 ~03MH'  
    c. 改变散射模型为“Tabulated BSDF”. :-$8u;!M  
    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 ) :3b02}b7  
    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。 !_B*Po  
    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 @~UQU)-(  
    g. 点击OK xH}bX-m  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 DQaE9gmC  
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    脚本代码 Z_ Y'#5o#  
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    '#Language "WWB-COM" $J&c1  
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    Option Explicit 7?y 7fwER  
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    Sub Main >mG64N  
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        'Cleanup  _+(@?  
        ClearOutputWindow() TU*EtE'g/  
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        Print "Merging RPC Photonics BSDF Data Files" Uqy/~n-v<  
        SetTextColor(255,0,0) ?)(-_N&T  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." \k{[HfVvn  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." \j3dB tc  
        SetTextColor(0,0,0) K>b4(^lf  
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        'Current directory of this script (should be the same as the text files being merged) bSz7?NAp  
        Dim cDir As String xgpf2y!{  
        cDir = MacroDir$ & "\" VxARJ*4=Y  
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        'Array which will be populated with the list of files to be merged het<#3Bo  
        Dim fList() As String, curFile As String ?:-:m'jdU  
        GetFileList( cDir, fList ) "Aw)0a[j1  
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        Print "" r\Yh'cRW{  
        Print "Files found for merging:" CyW|k Dz  
        For Each curFile In fList =6"5kz10  
            Print Chr(9) & curFile qMA-#  
        Next Au}l^&,zN  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. v\@RwtP  
        Dim nameArray() As String, sampName As String uoeZb=<  
        nameArray = Split(fList(0)," 0-0.txt") { I\og  
        sampName  = nameArray(0) U V*Ruy-  
        Print "" i1-%#YYF(  
        Print "Sample name: " & Chr(9) & sampName Y$]zba  
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        'Open an output file and write the FRED header data di0@E<@1:  
        Dim outFile As String '[%#70*  
        outFile = cDir & sampName & "_FRED.txt" .R'M'a#*!A  
        Open outFile For Output As #1 Jww#zEK  
        Print #1, "type bsdf_data" 79exZ7|  
        Print #1, "format angles=deg bsdf=value scale=1" 1EEcNtpub]  
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        'Loop the file list, skip the two header lines and write the remaining data to file FO:L+&hr?>  
        Dim lineArray() As String, curLine As Long &} `a"tYr  
        For Each curFile In fList 2A[hMbL  
            Print "Merging data from file " & curFile LdN[N^n[H  
            ReadFile( cDir & curFile, lineArray ) lv'WRS'}  
            For curLine = 2 To UBound(lineArray) <r$h =hM  
                Print #1, lineArray(curLine) !2l2;?jM  
            Next x3+ {Y  
        Next q!@!eC[b  
    [|=M<>?[  
        'Close the output file kP ,8[r  
        Close #1 ^-[ I;P  
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        Print "Finished merging RPC data for sample " & sampName 31alQ\TH  
        Print "FRED formatted data file: " & Chr(9) & outFile !]82$  
    End Sub :Ev gUA\4  
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    'Utility function to read the contents of a file into an array of strings. Zr2!}jD9a  
    Function ReadFile(ByVal fileName As String, _ 1BZ##xV*:G  
                      ByRef lineArray() As String) As Long s(3HZ>qx;  
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        ReadFile = -1 QOSMV#Nw%  
        Dim oFSO As Object X3 kFJ{  
        Set oFSO = CreateObject("Scripting.FileSystemObject") jqc}mI\#  
        Erase lineArray nW7: ]  
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        Dim fid As Long k'#3fz\  
        If oFSO.fileexists( fileName ) Then kaB|+U9^  
            fid = FreeFile() dX@ic,?  
            Open fileName For Input As fid #?>)5C\Hqy  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) dB0#EJaE  
            Close fid %\HPYnIe  
        End If ^Z?m)qxvB  
        Set oFSO = Nothing d$3md<lIB  
        Return UBound( lineArray ) abR<( H12  
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    End Function w|s2f`!  
    : #CWiq("%  
    Sub GetFileList( ByVal in_dir As String, _ xw 43P.  
                     ByRef in_flist() As String ) aq}hlA(w  
    %bN{FKNN  
        'Redimension the file list array BoYY^ih  
        Erase in_flist L,y q=%h|  
    =CK%Zo  
        'Tracks how many files are found \]]K{DO  
        Dim fCount As Long 8:V,>PH  
        fCount = 0 VPYLDg.'  
    w a(Y[]V  
        'Recurse directory and search for text files W6NhJ#M7  
        Dim f As String x-CjxU3  
        f = Dir$(in_dir & "*.txt") >,]a>V  
        While f <> "" uhfK\.3  
            ReDim Preserve in_flist(fCount) D5P-$1KPt  
            in_flist(fCount) = f h$!YKfhq}  
            fCount += 1 E4892B:`  
            f = Dir$() )LFbz#;Y  
        Wend 3Z9Yzv)A  
        ReDim Preserve in_flist(fCount-1) C?gqX0[ q  
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    End Sub fGlvum  
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