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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 @,j*wnR  
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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 Rxt^v+ ,$  
    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。 98c(<  
    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。 ZL&qp04}  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 oN~&_*FE  
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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。 H\"sgoJ  
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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) Ux!p8  
    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 Vi$~-6n&  
    例如下所示: 4}baSV  
    Sample name:  EDF-C1-56 m#Jmdb_  
    Merging data from file EDF-C1-56 0-0.txt h|9L5  
    Finished merging RPC data for sample EDF-C1-56 ' ,wFTV&  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt fSj5ZsO  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Pl06:g2I  
    a. 创建一个新的散射库 lN 4oW3QT  
    b. 散射模型命名 J$DE"| -  
    c. 改变散射模型为“Tabulated BSDF”. |-67 \p]  
    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 ) 1Faf$J~7|  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 A0s ZOCky  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 wo{gG?B  
    g. 点击OK &{n.]]%O.  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 +4~_Ei[i  
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    脚本代码 @l5"nBs<_:  
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    '#Language "WWB-COM" vzAaxk%  
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    Option Explicit _Kf%\xg  
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    Sub Main N7zft  
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        'Cleanup ZgcMv,=  
        ClearOutputWindow() h 0Q5-EA  
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        Print "Merging RPC Photonics BSDF Data Files" ibk6|pp  
        SetTextColor(255,0,0) 7hcYD!DS  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." f|c{5$N!  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 9ULQrq$?  
        SetTextColor(0,0,0) ,AFu C <  
    s?}e^/"v  
        'Current directory of this script (should be the same as the text files being merged) (NU NHxi5B  
        Dim cDir As String R4cM%l_#W  
        cDir = MacroDir$ & "\" c ( C%Hld  
    =z69e%.  
        'Array which will be populated with the list of files to be merged n0 {i&[I~+  
        Dim fList() As String, curFile As String OX!tsARC@  
        GetFileList( cDir, fList ) D2 eckLT  
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        Print "" _S1>j7RQo  
        Print "Files found for merging:" 5coyr`7mP  
        For Each curFile In fList CYP q#rd  
            Print Chr(9) & curFile dn+KH+v  
        Next _C?hHWSf"  
    @o _}g !9=  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. "?xHlYj@+  
        Dim nameArray() As String, sampName As String m}t`FsB.  
        nameArray = Split(fList(0)," 0-0.txt") osAd1<EIC  
        sampName  = nameArray(0) PiIpnoM  
        Print "" HCs?iJ  
        Print "Sample name: " & Chr(9) & sampName Jhhb7uU+  
    )9`qG:b'  
        'Open an output file and write the FRED header data \&3+D8H>n  
        Dim outFile As String g |yvF-+  
        outFile = cDir & sampName & "_FRED.txt" 'Aq{UGN  
        Open outFile For Output As #1 6ojo :-%Vf  
        Print #1, "type bsdf_data" IueFx u  
        Print #1, "format angles=deg bsdf=value scale=1" J @1!Oq>  
    .}TZxla0Zr  
        'Loop the file list, skip the two header lines and write the remaining data to file <uw9DU7G  
        Dim lineArray() As String, curLine As Long ]MitOkX  
        For Each curFile In fList ?mxMk6w  
            Print "Merging data from file " & curFile K`zdc`/  
            ReadFile( cDir & curFile, lineArray ) IK=a*}19L  
            For curLine = 2 To UBound(lineArray) ??vLUv  
                Print #1, lineArray(curLine) | rtD.,m   
            Next c9 _ rmz8  
        Next |FZ/[9*  
    :KP @RZm  
        'Close the output file Ai?*s%8v  
        Close #1 bJ {'<J  
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        Print "Finished merging RPC data for sample " & sampName 8^+%I/S$  
        Print "FRED formatted data file: " & Chr(9) & outFile H3=qe I  
    End Sub A[{yCn`tM  
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    'Utility function to read the contents of a file into an array of strings. #gs`#6 ,'  
    Function ReadFile(ByVal fileName As String, _ D.u{~  
                      ByRef lineArray() As String) As Long [<yaXQxl  
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        ReadFile = -1 `e&Suyf4B  
        Dim oFSO As Object ~4Fvy'  
        Set oFSO = CreateObject("Scripting.FileSystemObject") `kXs;T6&  
        Erase lineArray PB*&aYLU  
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        Dim fid As Long -zeG1gr3  
        If oFSO.fileexists( fileName ) Then .|fH y  
            fid = FreeFile() s-Tv8goNV  
            Open fileName For Input As fid AH7}/Rc  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) pO3SUOP  
            Close fid 5e^ChK0Q  
        End If 2eY_%Y0  
        Set oFSO = Nothing flbd0NB  
        Return UBound( lineArray ) <<5(0#y#  
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    End Function 0IBSRFt$g&  
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    Sub GetFileList( ByVal in_dir As String, _ N<VJ(20y  
                     ByRef in_flist() As String ) ?NsW|w_  
    })Vi  
        'Redimension the file list array xY(*.T9K  
        Erase in_flist 0GCEqQy8  
    xfe+n$~ c  
        'Tracks how many files are found &B1WtW  
        Dim fCount As Long [hv~o~q  
        fCount = 0 r[iflBP  
    h3 }OX{k  
        'Recurse directory and search for text files I,vJbvvl!  
        Dim f As String Qpc__dA\  
        f = Dir$(in_dir & "*.txt") T:yE(OBf  
        While f <> "" ENs&RZ;  
            ReDim Preserve in_flist(fCount) @lrztM  
            in_flist(fCount) = f c<Tf 2]vZE  
            fCount += 1 V {ddr:]4  
            f = Dir$() &d^m 1  
        Wend .}~_a76  
        ReDim Preserve in_flist(fCount-1) +VOK%8,p  
    <R=Zs[9M1  
    End Sub BpP y&  
     
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