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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 5<-_"/_  
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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 tz(\|0WDQ  
    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。 *&VH!K#@{  
    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。 k(Z+(Y'{q~  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 & i,on6  
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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。 r81YL  
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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) :[#g_*G@p  
    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 p7 b`Z>}  
    例如下所示: q$vATT  
    Sample name:  EDF-C1-56 ~RSOUrR  
    Merging data from file EDF-C1-56 0-0.txt Eq>3|(UT  
    Finished merging RPC data for sample EDF-C1-56 4_3O?IY  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt -!E))|A  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 3`@alhD'  
    a. 创建一个新的散射库 f&+=eUp  
    b. 散射模型命名 N>z<v\`  
    c. 改变散射模型为“Tabulated BSDF”.  SJY<#_b  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Ux_tHyc/  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 fFD:E} >5  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 neW_mu;~Z  
    g. 点击OK e(/~;"r{  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 G #.(% ,  
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    脚本代码 5>.)7D%  
    8>.l4:`  
    '#Language "WWB-COM" 4^1B'>I  
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    Option Explicit / H+br_D9  
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    Sub Main 6Q]c]cCu  
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        'Cleanup xEBiBsk d  
        ClearOutputWindow() 2`(-l{3  
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        Print "Merging RPC Photonics BSDF Data Files" \tFg10  
        SetTextColor(255,0,0) d#:&Uw  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." +pU\;x  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." }>vf(9sF`  
        SetTextColor(0,0,0) j&(2ze:=*$  
    #~um F%#  
        'Current directory of this script (should be the same as the text files being merged) A:Z$i5%'  
        Dim cDir As String 0-~Y[X"9.  
        cDir = MacroDir$ & "\" 4`@]jm  
    t ZUZNKODW  
        'Array which will be populated with the list of files to be merged G5W6P7-<X  
        Dim fList() As String, curFile As String *<*{gO?Q4  
        GetFileList( cDir, fList ) -|^}~yOx0=  
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        Print "" L-_dq0T  
        Print "Files found for merging:" TQm x$  
        For Each curFile In fList t ?8 ?Ok  
            Print Chr(9) & curFile ")|3ZB7>*  
        Next j:D@X=|  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. %&KJtKe  
        Dim nameArray() As String, sampName As String grEmp9Q ?  
        nameArray = Split(fList(0)," 0-0.txt") XQ.czj  
        sampName  = nameArray(0) :+ksmyW  
        Print "" 7kU:91zR  
        Print "Sample name: " & Chr(9) & sampName Ms5m.lX  
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        'Open an output file and write the FRED header data Bb[%?~ E!  
        Dim outFile As String sZFIQ)b9  
        outFile = cDir & sampName & "_FRED.txt" p D!IB`cA4  
        Open outFile For Output As #1 %C=^ h1t%  
        Print #1, "type bsdf_data" K7}EL|Kx  
        Print #1, "format angles=deg bsdf=value scale=1" KN U/Kc#  
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        'Loop the file list, skip the two header lines and write the remaining data to file V-a/%_D  
        Dim lineArray() As String, curLine As Long .{D[!Dp#h  
        For Each curFile In fList ?&Si P-G  
            Print "Merging data from file " & curFile @`2<^-r\  
            ReadFile( cDir & curFile, lineArray ) jI@0jxF  
            For curLine = 2 To UBound(lineArray) ]Po9a4w#  
                Print #1, lineArray(curLine) SeAokz>  
            Next 5)4*J.  
        Next 0'O;H[nrl  
    ]xQPSs_  
        'Close the output file X0 &1ICZ  
        Close #1 V x1C4  
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        Print "Finished merging RPC data for sample " & sampName P0U=lj/ b  
        Print "FRED formatted data file: " & Chr(9) & outFile r$=MBeT  
    End Sub "m +Eu|{  
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    'Utility function to read the contents of a file into an array of strings. P ETrMu<  
    Function ReadFile(ByVal fileName As String, _ E :*!an  
                      ByRef lineArray() As String) As Long 1\q(xka{  
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        ReadFile = -1 5sC{5LJzC  
        Dim oFSO As Object `L`*jA+_  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 9 m&"x/k  
        Erase lineArray / 3:R{9S%  
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        Dim fid As Long (V @g?|LZ  
        If oFSO.fileexists( fileName ) Then b_-ESs]g  
            fid = FreeFile() 4xhV +Y  
            Open fileName For Input As fid QQP bKok>  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) rz+G]J  
            Close fid %@q52ZQ  
        End If QlI g'B6  
        Set oFSO = Nothing CF9a~^+%  
        Return UBound( lineArray ) t/WauY2JUC  
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    End Function `g6XVa*%#  
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    Sub GetFileList( ByVal in_dir As String, _ P{5p'g ,  
                     ByRef in_flist() As String ) &W fs6g  
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        'Redimension the file list array #T Cz$_=t  
        Erase in_flist dgpo4'c}  
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        'Tracks how many files are found NuI9"I/  
        Dim fCount As Long ElhTB  
        fCount = 0 *MW)APw=  
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        'Recurse directory and search for text files xc Wr hg  
        Dim f As String ,e( |,u  
        f = Dir$(in_dir & "*.txt") B1c`(mHl  
        While f <> "" q,V JpqQ  
            ReDim Preserve in_flist(fCount) jV8mn{<  
            in_flist(fCount) = f !uLAW_~  
            fCount += 1 q7mqzMDk  
            f = Dir$() #)q}Jw4]j  
        Wend 1;3oGuHj8  
        ReDim Preserve in_flist(fCount-1) f!ehq\K1k  
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    End Sub wx -NUTRim  
     
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