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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 >dKK [E/[d  
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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 $jT&]p  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 r_C|gfIP  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 =B4,H=7Spf  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 I)#=#eI* :  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 C yg e  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) U'^AJ2L8  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 :g)0-gN   
    例如下所示: 50!/%  
    Sample name:  EDF-C1-56 s ^NO(  
    Merging data from file EDF-C1-56 0-0.txt hsV+?#I  
    Finished merging RPC data for sample EDF-C1-56 we'<Y  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt hZGoiWC  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 /H#- \r&r  
    a. 创建一个新的散射库 []HMUL]"  
    b. 散射模型命名 D|8vS8p  
    c. 改变散射模型为“Tabulated BSDF”. gcYx-gA}  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) hUirvDvX  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 HI/]s^aL  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 wMy$T<:   
    g. 点击OK {\-rZb==F2  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 tX;00g;U.  
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    脚本代码 r fqw/o  
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    '#Language "WWB-COM"  w0QN5?  
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    Option Explicit =H*}{'#  
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    Sub Main vW4~\]  
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        'Cleanup (]wi^dE  
        ClearOutputWindow() b *IJ +  
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        Print "Merging RPC Photonics BSDF Data Files" %M8Egr2|0  
        SetTextColor(255,0,0) DO<eBq\O  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." _`lj 3Lm0>  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." AH`n  
        SetTextColor(0,0,0) QX (x6y>Q  
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        'Current directory of this script (should be the same as the text files being merged) * d6[k Y  
        Dim cDir As String f.V;Hl,  
        cDir = MacroDir$ & "\" MLg<YL  
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        'Array which will be populated with the list of files to be merged 1|Y(XB^os(  
        Dim fList() As String, curFile As String fr'M)ox1  
        GetFileList( cDir, fList ) I( BG%CO9  
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        Print "" 7L)1mB.  
        Print "Files found for merging:" ^_4TDC~h  
        For Each curFile In fList 1lyJ;6i6L  
            Print Chr(9) & curFile 0 eZfHW&  
        Next M9Gs^  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. xw: v|(  
        Dim nameArray() As String, sampName As String Hv%(9)-8  
        nameArray = Split(fList(0)," 0-0.txt") }GvoQ#N  
        sampName  = nameArray(0) ;SQ<^"eK  
        Print "" *Yv"lB8  
        Print "Sample name: " & Chr(9) & sampName !- f>*|@  
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        'Open an output file and write the FRED header data m1_?xU  
        Dim outFile As String $w%oLI@kl  
        outFile = cDir & sampName & "_FRED.txt"  p>v,b&06  
        Open outFile For Output As #1 U`q[5U"  
        Print #1, "type bsdf_data" E%ea o$  
        Print #1, "format angles=deg bsdf=value scale=1" bHlG(1uf  
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        'Loop the file list, skip the two header lines and write the remaining data to file SCeZt [  
        Dim lineArray() As String, curLine As Long ANSvZqKh  
        For Each curFile In fList I Vy,A7f  
            Print "Merging data from file " & curFile q3Umqvl)oe  
            ReadFile( cDir & curFile, lineArray ) 6h>8^l  
            For curLine = 2 To UBound(lineArray) THH rGvb  
                Print #1, lineArray(curLine) Wm:3_C +j  
            Next H%7V)"  
        Next kF'^!Hp  
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        'Close the output file G B!3` A%&  
        Close #1 Y~1}B_  
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        Print "Finished merging RPC data for sample " & sampName /Nq!^=  
        Print "FRED formatted data file: " & Chr(9) & outFile ih `/1n  
    End Sub ~l!(I-'?g  
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    'Utility function to read the contents of a file into an array of strings. 0kgK~\^,.O  
    Function ReadFile(ByVal fileName As String, _ LoHWkNZ5:  
                      ByRef lineArray() As String) As Long |Ix6D  
    Bir }X  
        ReadFile = -1 Y^LFJB|b4  
        Dim oFSO As Object 6bnAVTL5  
        Set oFSO = CreateObject("Scripting.FileSystemObject") yP0P-8  
        Erase lineArray 0!=e1_  
    !|_ CXm T|  
        Dim fid As Long 9BI5qHEp  
        If oFSO.fileexists( fileName ) Then XBhWj\`(T  
            fid = FreeFile() &ukNzV}VW  
            Open fileName For Input As fid )$q<"t\#P#  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) V.WfP*~NJ  
            Close fid 7qE V5!  
        End If `Q26Dk  
        Set oFSO = Nothing UEo,:zeN[  
        Return UBound( lineArray ) {N5g52MN  
    *B}vYX  
    End Function 'G(N,vu[@  
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    Sub GetFileList( ByVal in_dir As String, _ ,b>cy&ut  
                     ByRef in_flist() As String ) }#!o^B8  
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        'Redimension the file list array &Wd,l$P<O  
        Erase in_flist '5ky<  
    `^AbFV 3  
        'Tracks how many files are found #!#V!^ o  
        Dim fCount As Long R'dF<&Kj|  
        fCount = 0 k6JB%m\E  
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        'Recurse directory and search for text files } Q1$v~  
        Dim f As String vzi=[A  
        f = Dir$(in_dir & "*.txt")  QN_5q5  
        While f <> "" ?; )(O2p  
            ReDim Preserve in_flist(fCount) >[|:cz  
            in_flist(fCount) = f BCUw"R#  
            fCount += 1 OD\x1,E)I  
            f = Dir$() jLr8?Hyf  
        Wend bG^eP :r  
        ReDim Preserve in_flist(fCount-1) FGwz5@|E  
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    End Sub ([f6\Pw\ <  
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