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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
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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 %+)o'nf"U  
    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。 (1R?s>3o  
    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。 h#r^teui)  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 fvq,,@23  
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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。 Q/ms]Du  
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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) epHJ@W@#  
    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 y&m0Lz53Z  
    例如下所示: %xZG*2vc!B  
    Sample name:  EDF-C1-56 WE6a'  
    Merging data from file EDF-C1-56 0-0.txt #oeG!<Mn  
    Finished merging RPC data for sample EDF-C1-56 JA)?p{j  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt *OJ/V O  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 h%; e0Xz|  
    a. 创建一个新的散射库 <h).fX  
    b. 散射模型命名 [#Lc]$  
    c. 改变散射模型为“Tabulated BSDF”. \c v?^AI  
    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 ) 6lwta`2  
    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。 'ly?P8h  
    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 vbx6I>\Y  
    g. 点击OK 7?8wyk|x  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "xmP6=1  
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    脚本代码 acP+3u?r  
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    '#Language "WWB-COM" `1*nL,i  
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    Option Explicit =gfI!w  
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    Sub Main uwf 5!Z:>  
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        'Cleanup fj7|D'c  
        ClearOutputWindow() Pg9hW  
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        Print "Merging RPC Photonics BSDF Data Files" O%g $9-?F0  
        SetTextColor(255,0,0) ^D^4 YJz  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." %*aJLn+]_R  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." b*a2,MiM  
        SetTextColor(0,0,0) S##1GOO  
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        'Current directory of this script (should be the same as the text files being merged) iv`O /T  
        Dim cDir As String ;6@r-r  
        cDir = MacroDir$ & "\" WW+l'6.  
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        'Array which will be populated with the list of files to be merged 2!&&|Mh}  
        Dim fList() As String, curFile As String HEL!GC>#  
        GetFileList( cDir, fList ) t }IkK=f  
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        Print "" ~\x:<)  
        Print "Files found for merging:" ;.xoN|Per  
        For Each curFile In fList .=m,hu~  
            Print Chr(9) & curFile /bj <Ft\  
        Next lis/`B\x  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3lV^B[$  
        Dim nameArray() As String, sampName As String  +`7KSwa  
        nameArray = Split(fList(0)," 0-0.txt") EbeI{ -'aF  
        sampName  = nameArray(0) K{n{KB&_&  
        Print "" -a*K$rnB  
        Print "Sample name: " & Chr(9) & sampName @ '@:sM_  
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        'Open an output file and write the FRED header data s yU9O&<  
        Dim outFile As String m}>F<;hQ  
        outFile = cDir & sampName & "_FRED.txt" {`2R,Jb%S  
        Open outFile For Output As #1 cvwhSdZu8  
        Print #1, "type bsdf_data" LIg{J%  
        Print #1, "format angles=deg bsdf=value scale=1" #%J5\+ua  
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        'Loop the file list, skip the two header lines and write the remaining data to file Oj<S.fi  
        Dim lineArray() As String, curLine As Long 2[0JO.K 4  
        For Each curFile In fList iU6Gp-<M ,  
            Print "Merging data from file " & curFile |ZodlYF  
            ReadFile( cDir & curFile, lineArray ) BpX6aAx  
            For curLine = 2 To UBound(lineArray) >~`C-K#  
                Print #1, lineArray(curLine) ,=?{("+  
            Next XqM3<~$  
        Next 2pdvWWh3l  
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        'Close the output file r`c_e)STO  
        Close #1 R/"x}B1d  
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        Print "Finished merging RPC data for sample " & sampName n$xQ[4eH)  
        Print "FRED formatted data file: " & Chr(9) & outFile 6<K6Y5<6  
    End Sub 52upoU>}2  
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    'Utility function to read the contents of a file into an array of strings. ~4q5 k5.,  
    Function ReadFile(ByVal fileName As String, _ P{Q=mEQ  
                      ByRef lineArray() As String) As Long r J KZ)N{  
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        ReadFile = -1 ~ %B<  
        Dim oFSO As Object `9k0Gd  
        Set oFSO = CreateObject("Scripting.FileSystemObject") "UwH\T4I  
        Erase lineArray 5k|9gICyd*  
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        Dim fid As Long 5>AX*]c  
        If oFSO.fileexists( fileName ) Then fwzb!"!.@  
            fid = FreeFile() Y.^=]-n,  
            Open fileName For Input As fid L@JOGCYy  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Qp`gswvE  
            Close fid g/13~UM\  
        End If &@ JvnO:  
        Set oFSO = Nothing []s^   
        Return UBound( lineArray ) > x IJE2  
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    End Function 0a"igq9t  
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    Sub GetFileList( ByVal in_dir As String, _ wf1lyS  
                     ByRef in_flist() As String ) %X9r_Hx  
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        'Redimension the file list array y\{%\$  
        Erase in_flist xeGb?DPu  
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        'Tracks how many files are found IKie1!ZU{"  
        Dim fCount As Long F[ewn/]n  
        fCount = 0 %,ngRYxT#  
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        'Recurse directory and search for text files Ali9pvE  
        Dim f As String q\H[am  
        f = Dir$(in_dir & "*.txt") i1 RiGS  
        While f <> "" ws^4?O  
            ReDim Preserve in_flist(fCount) "fq{Y~F%`  
            in_flist(fCount) = f ZcYh) HD  
            fCount += 1 mS0udHod  
            f = Dir$() Ie%EH  
        Wend 7=(Hy\Q5xH  
        ReDim Preserve in_flist(fCount-1) F5o+kz$;  
    " LJq%E  
    End Sub GRY2?'`  
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