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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 l6z}D; 4  
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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 kD{qW=Lpn  
    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。 , I^:xw_  
    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。 e 0cVg  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Hy| X>Z  
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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。 _+NM<o#A  
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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) lN,)T%[0-  
    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 ,d~6LXr<fM  
    例如下所示: 6>R|B?I%  
    Sample name:  EDF-C1-56 d^W1;0  
    Merging data from file EDF-C1-56 0-0.txt y>jP]LR4  
    Finished merging RPC data for sample EDF-C1-56 ,,o5hD0V9  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt b@  S.  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 *C"-$WU3o  
    a. 创建一个新的散射库 zM+eb| >cr  
    b. 散射模型命名 D5gDVulsh  
    c. 改变散射模型为“Tabulated BSDF”. )"4v0dv  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Z&[_8Y5j  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 w$%1j+%&  
    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 N"Mw1R4  
    g. 点击OK DF`?D +  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ^mZeAW  
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    脚本代码 f\]splL  
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    '#Language "WWB-COM" W v4o:_}  
    d&ap u{  
    Option Explicit h.WvPZ2U  
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    Sub Main GT3 ?)g{Z  
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        'Cleanup w(-h!d51+  
        ClearOutputWindow() {j!+\neL  
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        Print "Merging RPC Photonics BSDF Data Files" o b,%); m  
        SetTextColor(255,0,0) ?X5Y8n]y\h  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." b<1+q{0r  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." d@aPhzLu  
        SetTextColor(0,0,0) "B"Yfg[  
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        'Current directory of this script (should be the same as the text files being merged) T**v!Ls  
        Dim cDir As String l:$i}.C  
        cDir = MacroDir$ & "\" ~f5g\n;  
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        'Array which will be populated with the list of files to be merged U2TR>0l  
        Dim fList() As String, curFile As String H\!p%Y  
        GetFileList( cDir, fList ) M*n@djL$\~  
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        Print "" SG@-b(  
        Print "Files found for merging:" I`-N]sf^  
        For Each curFile In fList \#O}K  
            Print Chr(9) & curFile C0v1x=(xiM  
        Next Ap)[;_9BD  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 5@&{%99  
        Dim nameArray() As String, sampName As String ^Pp2T   
        nameArray = Split(fList(0)," 0-0.txt") BfUM+RC%5  
        sampName  = nameArray(0) M`u&-6  
        Print "" c4i%9E+Af  
        Print "Sample name: " & Chr(9) & sampName ]R?{9H|jwE  
    "Di8MMGOY  
        'Open an output file and write the FRED header data yuA+YZ  
        Dim outFile As String TVs#,  
        outFile = cDir & sampName & "_FRED.txt" 7>,(QHl  
        Open outFile For Output As #1 14Y<-OO: k  
        Print #1, "type bsdf_data" & c V$`L  
        Print #1, "format angles=deg bsdf=value scale=1" yMVlTO  
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        'Loop the file list, skip the two header lines and write the remaining data to file {2,vxGi  
        Dim lineArray() As String, curLine As Long YggeKN  
        For Each curFile In fList _`-trE.  
            Print "Merging data from file " & curFile &Ay[mZQ 7  
            ReadFile( cDir & curFile, lineArray ) 'ugc=-0pd  
            For curLine = 2 To UBound(lineArray) ;:DDz  
                Print #1, lineArray(curLine) 6#gS`X23Y  
            Next t]14bf$*Q  
        Next lNRGlTD%  
    2*)2c[/0F  
        'Close the output file Svqj@@_f  
        Close #1 F)n^pT  
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        Print "Finished merging RPC data for sample " & sampName jRGslak;  
        Print "FRED formatted data file: " & Chr(9) & outFile d":GsI?3  
    End Sub OAw- -rl  
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    'Utility function to read the contents of a file into an array of strings. e !2SO*O  
    Function ReadFile(ByVal fileName As String, _ ~H4wsa39  
                      ByRef lineArray() As String) As Long M%(^GdI#Vf  
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        ReadFile = -1 Wb{0UkApJ  
        Dim oFSO As Object 4}xw&x  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 19j"Zxdg Y  
        Erase lineArray iKM!>Fi  
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        Dim fid As Long a2%xW_e  
        If oFSO.fileexists( fileName ) Then  @ ^cR  
            fid = FreeFile() w Sd|-e  
            Open fileName For Input As fid A2 9R5  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1W r,E#+C  
            Close fid &m=73 RN  
        End If !fmbm4!a  
        Set oFSO = Nothing KBOp}MEz  
        Return UBound( lineArray ) H~:EPFi.(  
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    End Function wG@f~$   
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    Sub GetFileList( ByVal in_dir As String, _ YG_|L[/#  
                     ByRef in_flist() As String )  PrqyJ  
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        'Redimension the file list array /N9ct4 {^  
        Erase in_flist ;_p$5GVR|  
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        'Tracks how many files are found v8l3{qq  
        Dim fCount As Long K 7 OIT2-  
        fCount = 0 N@#,YnPI  
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        'Recurse directory and search for text files 8}K^o>J&K  
        Dim f As String :Xi&H.k)p  
        f = Dir$(in_dir & "*.txt") NH'Dz6K5  
        While f <> "" G_]zymXQ  
            ReDim Preserve in_flist(fCount) 'W*:9wah  
            in_flist(fCount) = f 10d.&vNw  
            fCount += 1 G _-JR  
            f = Dir$() 4G2iT+X-  
        Wend %E2b{Y;  
        ReDim Preserve in_flist(fCount-1) ("KtJ  
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    End Sub {/}%[cY =  
     
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