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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 ->IZZ5G<  
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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 S^D@8<6GJ  
    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。 1Lje.%(E.  
    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。 v/~&n  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Qqj9o2  
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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。 E^{!B]/oP  
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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) pih 0ME}z  
    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 eYkg4O'  
    例如下所示: tZg)VJQys  
    Sample name:  EDF-C1-56 RZnmia  
    Merging data from file EDF-C1-56 0-0.txt x2HISxg  
    Finished merging RPC data for sample EDF-C1-56 }{,Wha5\n  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt !RwhVaSh  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 xf7YIhL^*  
    a. 创建一个新的散射库 e_!Z-#\J%  
    b. 散射模型命名 {LA?v& b'  
    c. 改变散射模型为“Tabulated BSDF”. Y+g(aak+.  
    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 ) W)o*$c u  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 qZV|}M>P)  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 rhaq!s38:  
    g. 点击OK a[rb-Z  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (IjM  
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    脚本代码 ^PJN$BJx  
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    '#Language "WWB-COM" 5efN5Kt  
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    Option Explicit Vom,^`}  
    #< :`:@2  
    Sub Main LLzxCMc9*  
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        'Cleanup H{9P=l  
        ClearOutputWindow() ]8$H'u(C  
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        Print "Merging RPC Photonics BSDF Data Files" ;0?OBUDO  
        SetTextColor(255,0,0) Ml?KnSb  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 'YbE%i}  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." # SJJ@SM  
        SetTextColor(0,0,0) ^liW*F"UY  
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        'Current directory of this script (should be the same as the text files being merged) Ayn$,  
        Dim cDir As String ]WcN6|b+  
        cDir = MacroDir$ & "\" fF#Fc&B  
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        'Array which will be populated with the list of files to be merged Kf$(7FT'`  
        Dim fList() As String, curFile As String (LXYx<  
        GetFileList( cDir, fList ) !SnLvW89Z  
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        Print "" ln , 9v  
        Print "Files found for merging:" {5%d#|?  
        For Each curFile In fList jpW_q+^?  
            Print Chr(9) & curFile o#z$LT1dY  
        Next >YF=6zq.`  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. }ksp(.}G  
        Dim nameArray() As String, sampName As String q j9q   
        nameArray = Split(fList(0)," 0-0.txt") WMWMb3  
        sampName  = nameArray(0) &U}8@;  
        Print "" *O[/- p&7  
        Print "Sample name: " & Chr(9) & sampName ;<b7kepR  
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        'Open an output file and write the FRED header data <1* \ ~CX  
        Dim outFile As String Q^05n$ tI  
        outFile = cDir & sampName & "_FRED.txt" 1_c%p#?K  
        Open outFile For Output As #1 KPjAk  
        Print #1, "type bsdf_data" w2('75$J  
        Print #1, "format angles=deg bsdf=value scale=1" XsFzSm  
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        'Loop the file list, skip the two header lines and write the remaining data to file 7#9%,6Yi  
        Dim lineArray() As String, curLine As Long anfnqa8  
        For Each curFile In fList E:A!tu$B  
            Print "Merging data from file " & curFile vW?/:  
            ReadFile( cDir & curFile, lineArray ) R1%J6wZq  
            For curLine = 2 To UBound(lineArray) \"Z\Af<  
                Print #1, lineArray(curLine) 9v3n4=gc  
            Next cc}#-HKR[  
        Next -F3~X R  
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        'Close the output file D~M R)z_p~  
        Close #1 ]Ge>S?u  
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        Print "Finished merging RPC data for sample " & sampName g:G5'pZf  
        Print "FRED formatted data file: " & Chr(9) & outFile g4+Hq *  
    End Sub  +`ov1h  
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    'Utility function to read the contents of a file into an array of strings. co^h2b  
    Function ReadFile(ByVal fileName As String, _ 8?: 2<  
                      ByRef lineArray() As String) As Long 87!m l  
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        ReadFile = -1 V*Xr}FE  
        Dim oFSO As Object $}z/BV1I  
        Set oFSO = CreateObject("Scripting.FileSystemObject") h5-yhG  
        Erase lineArray h9iQn<lp4.  
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        Dim fid As Long m!P<# |V  
        If oFSO.fileexists( fileName ) Then U^U hZ!  
            fid = FreeFile() 8.I3%u  
            Open fileName For Input As fid u$(ei2f  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) UTN[! 0[  
            Close fid g)|vS>^~  
        End If y*US^HJOZ  
        Set oFSO = Nothing Ip)u6We>I  
        Return UBound( lineArray ) A^LS^!Jz  
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    End Function PCV#O63[  
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    Sub GetFileList( ByVal in_dir As String, _ ;vX1U8  
                     ByRef in_flist() As String ) gjX1z{{~L  
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        'Redimension the file list array unbIfl=  
        Erase in_flist Y"yrc0'&T  
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        'Tracks how many files are found C+5X8  
        Dim fCount As Long WXDo`_{R  
        fCount = 0 ;f N^MW@&[  
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        'Recurse directory and search for text files d~h;|Bl[  
        Dim f As String iDhC_F|  
        f = Dir$(in_dir & "*.txt") n4}e!  
        While f <> "" ZU+_nWnl  
            ReDim Preserve in_flist(fCount) g#7Q-n3^  
            in_flist(fCount) = f aIrM-c8.O  
            fCount += 1 FH$q,BI!R  
            f = Dir$() uwZ,l-6T  
        Wend I;eoy,  
        ReDim Preserve in_flist(fCount-1) u GqeT#dP  
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    End Sub )& Oxp&x  
     
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