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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 Kterp%J?  
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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 7*{9 2_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。 ry99R|/d1  
    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。 o>3g<- ul  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Kr;7~`$[  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 m\h. sg&  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) C}})dL;(  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 CBj&8#8Z  
    例如下所示: 1m$< %t.>  
    Sample name:  EDF-C1-56 $s[DT!8N  
    Merging data from file EDF-C1-56 0-0.txt Muhq,>!U  
    Finished merging RPC data for sample EDF-C1-56 gy%/zbZx  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt PA=.)8  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 WKHEU)'!  
    a. 创建一个新的散射库 lDBn3U&z>  
    b. 散射模型命名 *jAw  
    c. 改变散射模型为“Tabulated BSDF”. Ng;K-WB\  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) >'qkW$-95  
    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。 %cPz>PTW@  
    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 ;,z[|"y  
    g. 点击OK +N~?_5lv\s  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 >Ei-Spy>Xl  
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    脚本代码 k!%[W,*  
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    '#Language "WWB-COM" {nl]F  
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    Option Explicit kX\\t.nH  
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    Sub Main  :RYh@.  
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        'Cleanup a0s6G3J+9  
        ClearOutputWindow() (3H'!P7|~  
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        Print "Merging RPC Photonics BSDF Data Files" M-  f)\`I  
        SetTextColor(255,0,0) ^t|CD|,K_O  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 1|+Z mo"  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." (k@%04c  
        SetTextColor(0,0,0) ]#UyYgPk  
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        'Current directory of this script (should be the same as the text files being merged) m' LRP:9v  
        Dim cDir As String LuLnmnmB  
        cDir = MacroDir$ & "\" %*>ee[^L ,  
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        'Array which will be populated with the list of files to be merged 9c /&+j  
        Dim fList() As String, curFile As String 8T}Ycm5}  
        GetFileList( cDir, fList ) L_3undy,  
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        Print "" r306`)kX  
        Print "Files found for merging:" c<'Pt4LY  
        For Each curFile In fList -Qt>yzD3  
            Print Chr(9) & curFile q~3dbj  
        Next [&Kn&bdKW  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. O Oa}+^-j  
        Dim nameArray() As String, sampName As String 4 Ar\`{c>  
        nameArray = Split(fList(0)," 0-0.txt") B/*`u  
        sampName  = nameArray(0) dy4! >zxF  
        Print "" dkz79G}e  
        Print "Sample name: " & Chr(9) & sampName fvW7a8k3  
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        'Open an output file and write the FRED header data -^y$RJC  
        Dim outFile As String M]S&vE{D  
        outFile = cDir & sampName & "_FRED.txt" l P4A?J+Q  
        Open outFile For Output As #1 YKjm_)8]w  
        Print #1, "type bsdf_data" ) o)k~6uT  
        Print #1, "format angles=deg bsdf=value scale=1" Ha U6`IP  
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        'Loop the file list, skip the two header lines and write the remaining data to file s^ t1T&  
        Dim lineArray() As String, curLine As Long +1K9R\  
        For Each curFile In fList Ab]`*h\U  
            Print "Merging data from file " & curFile G8m:]!  
            ReadFile( cDir & curFile, lineArray ) _L?`C  
            For curLine = 2 To UBound(lineArray) PMDx5-{A/t  
                Print #1, lineArray(curLine) QzjLKjl7p4  
            Next t%<@k)hd~G  
        Next RhJ{#G~:%  
    LuM[*_8  
        'Close the output file w8|38m  
        Close #1 {b|:q>Be8  
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        Print "Finished merging RPC data for sample " & sampName @O;gKFx  
        Print "FRED formatted data file: " & Chr(9) & outFile 6K/j,e>L  
    End Sub H_RVGAb U  
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    'Utility function to read the contents of a file into an array of strings. ,S|v>i, @  
    Function ReadFile(ByVal fileName As String, _ >x(3p@6p  
                      ByRef lineArray() As String) As Long w7.I0)MH  
    +="?[:  
        ReadFile = -1 &dqC =oK]  
        Dim oFSO As Object S7tc  
        Set oFSO = CreateObject("Scripting.FileSystemObject") =WaZy>n}7  
        Erase lineArray k<mfBNvuo  
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        Dim fid As Long pi>,>-Z  
        If oFSO.fileexists( fileName ) Then Kh)SgJ3B@  
            fid = FreeFile() 4I"p>FIkY  
            Open fileName For Input As fid xWY%-CWY.  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) [L.+N@M  
            Close fid Q@]QPpe  
        End If {uO=Wkp~7  
        Set oFSO = Nothing HPGMR4=ANS  
        Return UBound( lineArray ) g]^@bxdg  
    |1sl>X,  
    End Function 3` ov?T(H  
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    Sub GetFileList( ByVal in_dir As String, _ !J3dlUFRO  
                     ByRef in_flist() As String ) 8IErLu}  
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        'Redimension the file list array wS*An4%G  
        Erase in_flist xPFNH`O&  
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        'Tracks how many files are found ]>E)0<t  
        Dim fCount As Long 5PY,}1`  
        fCount = 0 _*d8:|qw  
    oyQp"'|N  
        'Recurse directory and search for text files !f 7CN<  
        Dim f As String Hw 7   
        f = Dir$(in_dir & "*.txt") +!dWQ=W  
        While f <> "" (vX+ Yw  
            ReDim Preserve in_flist(fCount) ^_6.*Mvx  
            in_flist(fCount) = f muMb pF  
            fCount += 1 FerQA9K)x  
            f = Dir$() Z`L-UQJ .  
        Wend Czj]jA(0f  
        ReDim Preserve in_flist(fCount-1) ,e6n3]W8  
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    End Sub ~b.C[s  
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