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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: 2025-07-22
    摘要 t!SQLgA  
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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 aRKRy  
    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。 !* Z)[[  
    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。 Gu`Vk/&  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Jf<yTAm  
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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。 wT~;tOw~  
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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) ?VZXJO{^  
    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 Ym{%"EB  
    例如下所示: @b*T4hwA.  
    Sample name:  EDF-C1-56 3ZL7N$N}7  
    Merging data from file EDF-C1-56 0-0.txt gDNTIOV  
    Finished merging RPC data for sample EDF-C1-56 csX*XiDWm  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt &tz%WW%D8  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +.#S[G  
    a. 创建一个新的散射库 *DC Nu{6  
    b. 散射模型命名 O;BMwg_7  
    c. 改变散射模型为“Tabulated BSDF”. uM)9b*Vbo  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 0rJ\e  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 W|rFl]~a  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 QGv:h[b_  
    g. 点击OK @52=3  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 4a.e ,gitf  
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    脚本代码 Rc:cVK  
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    '#Language "WWB-COM" #D LT-G0  
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    Option Explicit ?sf2h:\N  
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    Sub Main :KV,:13`D  
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        'Cleanup 6 ,pZRc  
        ClearOutputWindow() YNgR1 :l  
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        Print "Merging RPC Photonics BSDF Data Files" .)^3t ~  
        SetTextColor(255,0,0) v>y8s&/  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." @@{_[ir  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ;TV'PJ  
        SetTextColor(0,0,0) 9HNh*Gc=  
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        'Current directory of this script (should be the same as the text files being merged) ? W2I1HEy  
        Dim cDir As String IJ_ 'w[k  
        cDir = MacroDir$ & "\" %YvSHh;c  
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        'Array which will be populated with the list of files to be merged ^tg6JB;s  
        Dim fList() As String, curFile As String Sp`fh7d.(  
        GetFileList( cDir, fList ) <7FP"YU  
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        Print "" 0'%+X|  
        Print "Files found for merging:" g"Q}h  
        For Each curFile In fList CdzkMVH  
            Print Chr(9) & curFile Xs%R]KOwt  
        Next qD$GKN.  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. N1+4bR  
        Dim nameArray() As String, sampName As String iUxDEt[t*  
        nameArray = Split(fList(0)," 0-0.txt") m.HX2(&\3  
        sampName  = nameArray(0) .sJys SA\  
        Print "" *3F /Ft5  
        Print "Sample name: " & Chr(9) & sampName / UaNYv/  
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        'Open an output file and write the FRED header data NDe[2  
        Dim outFile As String Z}LOy^TL  
        outFile = cDir & sampName & "_FRED.txt" TRySl5jx@  
        Open outFile For Output As #1 @wEKCn|}o  
        Print #1, "type bsdf_data" STXqq[+Rf  
        Print #1, "format angles=deg bsdf=value scale=1" n $O.>  
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        'Loop the file list, skip the two header lines and write the remaining data to file oA!5dpNhU  
        Dim lineArray() As String, curLine As Long JI+KS  
        For Each curFile In fList u"#6_-0y  
            Print "Merging data from file " & curFile 7}#*3*]  
            ReadFile( cDir & curFile, lineArray ) H)j [eZP  
            For curLine = 2 To UBound(lineArray) 1C}pv{0:&  
                Print #1, lineArray(curLine) U+9- li  
            Next ]uStn   
        Next e_I; y  
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        'Close the output file M!&_qj&N,  
        Close #1 nCffBc  
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        Print "Finished merging RPC data for sample " & sampName J+3\2D?  
        Print "FRED formatted data file: " & Chr(9) & outFile kwDh|K  
    End Sub qEK4I}Q-=  
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    'Utility function to read the contents of a file into an array of strings. t`<}UWAH+  
    Function ReadFile(ByVal fileName As String, _  Vp(D|}P  
                      ByRef lineArray() As String) As Long koncWyW  
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        ReadFile = -1 p@cfY]<7  
        Dim oFSO As Object HQ|o%9~  
        Set oFSO = CreateObject("Scripting.FileSystemObject") F.~n  
        Erase lineArray 2d5}`>  
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        Dim fid As Long Wz6]*P`qv  
        If oFSO.fileexists( fileName ) Then ;xW8Z<\-  
            fid = FreeFile() :"OZc7 ~  
            Open fileName For Input As fid mHK@(D7X  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) c W81  
            Close fid * 1 |YLy  
        End If ":UWowJO  
        Set oFSO = Nothing msA' 5>  
        Return UBound( lineArray ) Ax5mP8S  
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    End Function G*P[z'K=  
    {\vI9cni|"  
    Sub GetFileList( ByVal in_dir As String, _ HZQDe&  
                     ByRef in_flist() As String ) fbh6Ls/  
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        'Redimension the file list array XPHQAo[(s  
        Erase in_flist %+AS0 JhB  
    8BYIxHHz  
        'Tracks how many files are found ;,v!7   
        Dim fCount As Long eVqM=%Q  
        fCount = 0 nuf@}W>y  
    }Kv h`@CiJ  
        'Recurse directory and search for text files bn0"M+7)f  
        Dim f As String tyc8{t#Z  
        f = Dir$(in_dir & "*.txt") );Tx5Z}  
        While f <> "" O{lIs_1.Z  
            ReDim Preserve in_flist(fCount) =8$|_  
            in_flist(fCount) = f :[y]p7;{f  
            fCount += 1 a(PjcQ4dY  
            f = Dir$() HBt|}uZ?6i  
        Wend $Nj'OJSj%  
        ReDim Preserve in_flist(fCount-1) 6@"Vqm|HD  
    ??%)|nj.  
    End Sub qg^(w fI  
     
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