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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 LE^G&<!  
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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 f&@BKx  
    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。 G* b2,9&F  
    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。 A1Y7;-D  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 cS .i  
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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~Q)Uy5N(D  
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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) Q/>L_S  
    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 bF}V4"d,B3  
    例如下所示: D<{{ :7n  
    Sample name:  EDF-C1-56 NF$\^WvYSP  
    Merging data from file EDF-C1-56 0-0.txt O%!5<8Xrb  
    Finished merging RPC data for sample EDF-C1-56 B#%; Qc  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ~`#-d ^s:  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 )QiQn=Ce  
    a. 创建一个新的散射库 K!AAGj`  
    b. 散射模型命名 JOn yrks  
    c. 改变散射模型为“Tabulated BSDF”. vC;]jJb:  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 4A`NJ  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 )x,8D ~p'  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 %i0?UpA  
    g. 点击OK Br>Fpe$q4  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 36m5bYMd)  
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    脚本代码 2 -!L _W(  
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    '#Language "WWB-COM" M.}7pJ7f  
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    Option Explicit ?ne_m:J[  
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    Sub Main i=FQGWAUu  
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        'Cleanup ni&*E~a  
        ClearOutputWindow() QvPD8B  
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        Print "Merging RPC Photonics BSDF Data Files" d?,M/$h  
        SetTextColor(255,0,0) 3+7^uR$/I4  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." k5d\ w@G"~  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." N^?9ZO   
        SetTextColor(0,0,0) ^>4o$}  
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        'Current directory of this script (should be the same as the text files being merged) %T`U^ Pnr  
        Dim cDir As String ~rbIMF4T`]  
        cDir = MacroDir$ & "\" 5 +9 Ze9  
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        'Array which will be populated with the list of files to be merged +m\|e{G  
        Dim fList() As String, curFile As String |tMn={  
        GetFileList( cDir, fList ) JwnAW}=  
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        Print "" zRl~^~sY  
        Print "Files found for merging:" /BKe+]dS*  
        For Each curFile In fList n;XWMY  
            Print Chr(9) & curFile *mG`_9  
        Next VU|dV\>  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. DsDzkwJE  
        Dim nameArray() As String, sampName As String 1,y&d}GW  
        nameArray = Split(fList(0)," 0-0.txt") -PB[-CX  
        sampName  = nameArray(0) C2e.2)y  
        Print "" e= P  
        Print "Sample name: " & Chr(9) & sampName P%pp )BS  
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        'Open an output file and write the FRED header data ig"uXs  
        Dim outFile As String $.6K!x{(  
        outFile = cDir & sampName & "_FRED.txt" "+"{+k5t  
        Open outFile For Output As #1 `A%^UCd  
        Print #1, "type bsdf_data" =#5D(0Ab  
        Print #1, "format angles=deg bsdf=value scale=1" { Ng oYl  
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        'Loop the file list, skip the two header lines and write the remaining data to file z(RL<N%  
        Dim lineArray() As String, curLine As Long 7;`o( [N  
        For Each curFile In fList : DG)g3#  
            Print "Merging data from file " & curFile ,M !tm7  
            ReadFile( cDir & curFile, lineArray ) _=6 rE  
            For curLine = 2 To UBound(lineArray) C@y8.#l  
                Print #1, lineArray(curLine) sf} Dh  
            Next &YP#M |  
        Next :)f7A7:;  
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        'Close the output file "kMzmo=Pv5  
        Close #1 Lju7,/UD  
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        Print "Finished merging RPC data for sample " & sampName %9C@ Xl  
        Print "FRED formatted data file: " & Chr(9) & outFile zkM"cb13q/  
    End Sub 10Wz,vW,n  
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    'Utility function to read the contents of a file into an array of strings. #PvB/3  
    Function ReadFile(ByVal fileName As String, _ Huw\&E  
                      ByRef lineArray() As String) As Long AZ|yX  
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        ReadFile = -1 [a[/_Sf{  
        Dim oFSO As Object K?x,T8<aW  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Id'RL2Kq*&  
        Erase lineArray !4"sX+z9  
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        Dim fid As Long Fh7'[>onw  
        If oFSO.fileexists( fileName ) Then I<b?vR 'F  
            fid = FreeFile() R$kpiqK  
            Open fileName For Input As fid }!#gu3  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) jo +w>  
            Close fid w JwX[\  
        End If l*b)st_p%  
        Set oFSO = Nothing 3CjL\pIC  
        Return UBound( lineArray ) 8{U-m0v  
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    End Function gCd`pi 8  
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    Sub GetFileList( ByVal in_dir As String, _ B-.v0R`5  
                     ByRef in_flist() As String ) `?\tUO2_T  
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        'Redimension the file list array zboF 1v`  
        Erase in_flist 5y2? f  
    %m5Q"4O  
        'Tracks how many files are found gQSNU_o Z  
        Dim fCount As Long !%<^K.wG  
        fCount = 0 pb60R|k  
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        'Recurse directory and search for text files 8?t"C_>*e  
        Dim f As String t-u|U(n  
        f = Dir$(in_dir & "*.txt") 3LR p2(A  
        While f <> "" d<w~jP\  
            ReDim Preserve in_flist(fCount) nm$Dd~mxW1  
            in_flist(fCount) = f 7fp(R&)1  
            fCount += 1 ln*icaDqf  
            f = Dir$() R`Aj|C z  
        Wend sGDV]~E  
        ReDim Preserve in_flist(fCount-1) C`rLj5E%  
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    End Sub YIt9M,5/Q  
     
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