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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    离线infotek
     
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    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 >/7[HhBT  
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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 E[tEW0ub  
    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。 %J :2y  
    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。 >qci $  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 e`;U9Z  
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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。 #RP7?yGM,  
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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) 7r$'2">K(  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 jT:kk  
    例如下所示: v Yw$m#@  
    Sample name:  EDF-C1-56 .h\[7r  
    Merging data from file EDF-C1-56 0-0.txt $GX9-^og=T  
    Finished merging RPC data for sample EDF-C1-56 V,>uM >$  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ;(;{~1~  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 |oTA $bln  
    a. 创建一个新的散射库 ! f*t9 I9Q  
    b. 散射模型命名 *!L it:H  
    c. 改变散射模型为“Tabulated BSDF”. k>!A~gfP~  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) T<~?7-O"  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 a'YK1QX  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 xkmqf7w  
    g. 点击OK 8% `Jf`  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 <jtu/U]78|  
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    脚本代码 .{66q#.  
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    '#Language "WWB-COM" 5hE mXZ%  
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    Option Explicit ^26}8vt  
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    Sub Main qb >mUS  
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        'Cleanup F@jyTIS^  
        ClearOutputWindow() HbQ+:B]  
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        Print "Merging RPC Photonics BSDF Data Files" m7NrS?7  
        SetTextColor(255,0,0) [qQ~\]  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." "D.`:9sk0  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." IjnO2X  
        SetTextColor(0,0,0) !&@!:=X,  
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        'Current directory of this script (should be the same as the text files being merged) GB` G(a  
        Dim cDir As String nZ~J &QK-  
        cDir = MacroDir$ & "\" -aF\ u[b  
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        'Array which will be populated with the list of files to be merged ky |Py  
        Dim fList() As String, curFile As String ff.;6R\  
        GetFileList( cDir, fList ) Yp8GW1@  
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        Print "" 0Nq6>^ %  
        Print "Files found for merging:" Q*l_QnfG  
        For Each curFile In fList ,[|4{qli\  
            Print Chr(9) & curFile EmubpUS;  
        Next 7~7_T#dTh  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. <jHo2U8/"s  
        Dim nameArray() As String, sampName As String 6qkMB|@Ix  
        nameArray = Split(fList(0)," 0-0.txt") H?W8_XiN  
        sampName  = nameArray(0) !i*bb~  
        Print "" qo62!q  
        Print "Sample name: " & Chr(9) & sampName <R @w0b>  
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        'Open an output file and write the FRED header data Pq)C(Z  
        Dim outFile As String 0ntf%#2{  
        outFile = cDir & sampName & "_FRED.txt" ds D!)$  
        Open outFile For Output As #1 oJbMUEQQq  
        Print #1, "type bsdf_data" ,]qTJ`J  
        Print #1, "format angles=deg bsdf=value scale=1" 9|9Hk1  
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        'Loop the file list, skip the two header lines and write the remaining data to file !;~6nYY  
        Dim lineArray() As String, curLine As Long TEt+At`]  
        For Each curFile In fList sqP (1|9  
            Print "Merging data from file " & curFile @?\[M9yK  
            ReadFile( cDir & curFile, lineArray ) lgaE2`0 [3  
            For curLine = 2 To UBound(lineArray) jj8h>"d  
                Print #1, lineArray(curLine)  2/v9  
            Next Rw#4 |&  
        Next Qfd4")zhG  
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        'Close the output file ^YwTO/Q|  
        Close #1 ^E349c-|  
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        Print "Finished merging RPC data for sample " & sampName z6f N)kw  
        Print "FRED formatted data file: " & Chr(9) & outFile M5>cYVG  
    End Sub w5tcO%+k1  
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    'Utility function to read the contents of a file into an array of strings. }* s%|!{H  
    Function ReadFile(ByVal fileName As String, _ \OX;ZVb?5  
                      ByRef lineArray() As String) As Long ;u "BCW  
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        ReadFile = -1 9et%Hn.K'  
        Dim oFSO As Object @XR N#_{  
        Set oFSO = CreateObject("Scripting.FileSystemObject") L5-Kw+t  
        Erase lineArray ^B`*4  
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        Dim fid As Long 1 /dy@'  
        If oFSO.fileexists( fileName ) Then 8) 1+j>OQ  
            fid = FreeFile() |E#+X  
            Open fileName For Input As fid WY 'QhieH  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ql_GN[c/  
            Close fid b6y/o48  
        End If u~y0H  
        Set oFSO = Nothing IGC:zZ~z  
        Return UBound( lineArray ) m^M sp:T,  
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    End Function ]= nM|e  
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    Sub GetFileList( ByVal in_dir As String, _ B(TE?[ #  
                     ByRef in_flist() As String ) K~DQUmU@  
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        'Redimension the file list array SZ'2/#R>  
        Erase in_flist _2N7E#m"S  
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        'Tracks how many files are found v@^P4cu;  
        Dim fCount As Long >/5'0n_R  
        fCount = 0 48 n5Y~YS  
    ;:5Ahfo \  
        'Recurse directory and search for text files XD=p:Ezh  
        Dim f As String WY)*3?  
        f = Dir$(in_dir & "*.txt") aUTXg60l*  
        While f <> "" .lt|$["  
            ReDim Preserve in_flist(fCount) 8pZGu8  
            in_flist(fCount) = f / 8 0Q  
            fCount += 1 @G&2Tbj[`  
            f = Dir$() Z>t,B%v  
        Wend v3 q.,I_  
        ReDim Preserve in_flist(fCount-1) #o/  
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    End Sub aI'MVKwMk  
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