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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 LdN[N^n[H  
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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 H"6x/&s.=k  
    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。 vc&+qI+I3  
    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。 a%`%("g!  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 hpb|| V  
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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。 Zr2!}jD9a  
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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) XGH:'^o_  
    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 X3 kFJ{  
    例如下所示: RO,TNS~  
    Sample name:  EDF-C1-56 H>%AK''  
    Merging data from file EDF-C1-56 0-0.txt >19s:+  
    Finished merging RPC data for sample EDF-C1-56 ~$5XiY8A  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt \GxqE8  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,.>9$(s  
    a. 创建一个新的散射库 ;M4[Liw~O  
    b. 散射模型命名 ]Z8u0YtM)  
    c. 改变散射模型为“Tabulated BSDF”. 3WGET[3  
    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 ) Pd"c*n&9  
    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。 c]aU}[s1  
    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 1J"I.  
    g. 点击OK cr{yy :D  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 sIg TSdk  
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    脚本代码 aq}hlA(w  
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    '#Language "WWB-COM" ?4/pE@RIy  
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    Option Explicit 'kt6%d2  
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    Sub Main ]$r]GVeN}H  
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        'Cleanup Qr$ 7 U6p  
        ClearOutputWindow() RdWn =;  
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        Print "Merging RPC Photonics BSDF Data Files" DX>LB$dy?  
        SetTextColor(255,0,0) -6kX?sNl)X  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Ia}qDGqPp!  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." =JzzrM|V*  
        SetTextColor(0,0,0) :p/=KI_  
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        'Current directory of this script (should be the same as the text files being merged) `mz}D76~#  
        Dim cDir As String ue@/o,C>  
        cDir = MacroDir$ & "\" JP<j4/  
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        'Array which will be populated with the list of files to be merged xz!0BG  
        Dim fList() As String, curFile As String B+Qf? 1f  
        GetFileList( cDir, fList ) SQ4^sk_!  
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        Print "" C`i#7zsH  
        Print "Files found for merging:" `J,>#Y6(J  
        For Each curFile In fList ^7aqe*|vm  
            Print Chr(9) & curFile `~)?OTzU#  
        Next Eb4NPWo  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ,W)DQwAg  
        Dim nameArray() As String, sampName As String ~F'6k&A^q  
        nameArray = Split(fList(0)," 0-0.txt") k}fC58q  
        sampName  = nameArray(0) SED52$zA  
        Print "" N)g_LL>^  
        Print "Sample name: " & Chr(9) & sampName B1 }-   
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        'Open an output file and write the FRED header data V_J0I*Qa4  
        Dim outFile As String _F6<ba}o3  
        outFile = cDir & sampName & "_FRED.txt" hb3:,c(  
        Open outFile For Output As #1 -\f7qRW^U  
        Print #1, "type bsdf_data" VU,G.eLW  
        Print #1, "format angles=deg bsdf=value scale=1" kiM:(=5  
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        'Loop the file list, skip the two header lines and write the remaining data to file \[3~*eX6  
        Dim lineArray() As String, curLine As Long v3Vve:}+  
        For Each curFile In fList EO)JMV?6  
            Print "Merging data from file " & curFile "D.<~!  
            ReadFile( cDir & curFile, lineArray ) Gb `)d  
            For curLine = 2 To UBound(lineArray) M@{?#MkS%  
                Print #1, lineArray(curLine) MN2i0!+  
            Next ZcXAqep8'  
        Next GbQi3%  
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        'Close the output file  wkZwtq  
        Close #1 Ak@!F6~  
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        Print "Finished merging RPC data for sample " & sampName 8*0QVFn$  
        Print "FRED formatted data file: " & Chr(9) & outFile CHKhJ v3+4  
    End Sub #[=kQ&  
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    'Utility function to read the contents of a file into an array of strings. " 7^nRJy  
    Function ReadFile(ByVal fileName As String, _ S3%2T  
                      ByRef lineArray() As String) As Long yk4 @@kHW  
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        ReadFile = -1 _ZhQY,  
        Dim oFSO As Object /";tkad^  
        Set oFSO = CreateObject("Scripting.FileSystemObject") % vUU Fub  
        Erase lineArray f9u=h}  
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        Dim fid As Long (%L /|F_  
        If oFSO.fileexists( fileName ) Then >ZOlSLu  
            fid = FreeFile() D^ @@ P  
            Open fileName For Input As fid \bdKLcKI,  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) b69nj  
            Close fid p($vM^_<"  
        End If ~NK $rHwi%  
        Set oFSO = Nothing )&O2l  
        Return UBound( lineArray ) F&wAre<  
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    End Function &q<k0_5Q  
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    Sub GetFileList( ByVal in_dir As String, _ iUcX\ uW  
                     ByRef in_flist() As String ) ys=} V|  
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        'Redimension the file list array =OO4C  
        Erase in_flist y5eEEG6  
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        'Tracks how many files are found /.e7#-+?  
        Dim fCount As Long {BJ>x:2  
        fCount = 0 pSlc (M>  
    -O$vJ,*  
        'Recurse directory and search for text files yx|iZhK0:}  
        Dim f As String Fqw4XR_`~  
        f = Dir$(in_dir & "*.txt") zF`a:dD$d  
        While f <> "" P{A})t7  
            ReDim Preserve in_flist(fCount) PI*@.kqR-  
            in_flist(fCount) = f D-{*3?x  
            fCount += 1 j#p;XI  
            f = Dir$() m)L50ot:/  
        Wend 4E.9CjN1>  
        ReDim Preserve in_flist(fCount-1) Xsa8YP9  
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    End Sub l[i4\ CT  
     
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