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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    离线infotek
     
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    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 [.&[<!,.  
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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 B^q<2S;  
    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。 ~ffwLgu!  
    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。 q qvF-mDN  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 C6^j#rl  
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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。 >| m.?{^  
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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) mH\@QdF  
    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 1;&T^Gdj  
    例如下所示: PGX+p+wB  
    Sample name:  EDF-C1-56 CDCC1BG"  
    Merging data from file EDF-C1-56 0-0.txt  hY=I5[*  
    Finished merging RPC data for sample EDF-C1-56 6+PGwCS  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Gru ALx7  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 X| <yq  
    a. 创建一个新的散射库 i0ybJOa4  
    b. 散射模型命名 } 0{B  
    c. 改变散射模型为“Tabulated BSDF”. E {>`MNj  
    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 ) KlO(o#&N  
    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。 Ekjf^Uo  
    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 >S.91!x  
    g. 点击OK R|Y~u*D  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 0p3vE,pF  
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    脚本代码 Kz[BB@[  
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    '#Language "WWB-COM" <'2u a  
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    Option Explicit HcO5?{2  
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    Sub Main p(?3 V  
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        'Cleanup fS I%c3  
        ClearOutputWindow() c<tmj{$  
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        Print "Merging RPC Photonics BSDF Data Files" =P]GPEz_  
        SetTextColor(255,0,0) bn-=fb(  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 40.AM1Z0f  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." }n[Bq#  
        SetTextColor(0,0,0) WG%2<Q^  
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        'Current directory of this script (should be the same as the text files being merged) (\& 62B1  
        Dim cDir As String )!,@m>0v{  
        cDir = MacroDir$ & "\" ]l&'k23~p  
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        'Array which will be populated with the list of files to be merged V6*?$o  
        Dim fList() As String, curFile As String *"T+G*~  
        GetFileList( cDir, fList ) TQ-KkH}y  
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        Print "" S:GTc QU  
        Print "Files found for merging:" Q>%E`h  
        For Each curFile In fList veO?k.u(  
            Print Chr(9) & curFile |j# ^@R  
        Next **HrWM%?8o  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Z s73 ad  
        Dim nameArray() As String, sampName As String T#r=<YH[C  
        nameArray = Split(fList(0)," 0-0.txt") H:MUNc8i  
        sampName  = nameArray(0) dEET}s\  
        Print "" /.@x 4cdS  
        Print "Sample name: " & Chr(9) & sampName xVTo4-[p  
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        'Open an output file and write the FRED header data e^WqJ7j  
        Dim outFile As String ArX]L$ D  
        outFile = cDir & sampName & "_FRED.txt" 'M-)Os "  
        Open outFile For Output As #1 r0uJ$/!  
        Print #1, "type bsdf_data" D6:DrA:  
        Print #1, "format angles=deg bsdf=value scale=1" `u=oeM :  
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        'Loop the file list, skip the two header lines and write the remaining data to file wPQ&Di*X}  
        Dim lineArray() As String, curLine As Long nF|Oy0  
        For Each curFile In fList C[0MA ,^  
            Print "Merging data from file " & curFile ]_\AHnJ  
            ReadFile( cDir & curFile, lineArray ) MYu`c[$jZ  
            For curLine = 2 To UBound(lineArray) J@gm@ jLc  
                Print #1, lineArray(curLine) A$ J9U3+O  
            Next *?p ^6vO  
        Next wBE7Bv45  
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        'Close the output file XJ O[[G`  
        Close #1 hd8B0eD'  
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        Print "Finished merging RPC data for sample " & sampName V07VwVD  
        Print "FRED formatted data file: " & Chr(9) & outFile wePI*."]  
    End Sub 9p4%8WhJ  
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    'Utility function to read the contents of a file into an array of strings. pbPz$Y  
    Function ReadFile(ByVal fileName As String, _ ^glX1 )  
                      ByRef lineArray() As String) As Long ovB=Zm  
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        ReadFile = -1 %uj[`  
        Dim oFSO As Object *.:!Ax  
        Set oFSO = CreateObject("Scripting.FileSystemObject") D$QGLI9(  
        Erase lineArray o>.AdZby  
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        Dim fid As Long Shs')Zs bv  
        If oFSO.fileexists( fileName ) Then `|&\e_"DE  
            fid = FreeFile() gji*Wq  
            Open fileName For Input As fid q?(A!1(u  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) R9Ldl97'  
            Close fid A 0 S8Dh$  
        End If U&`6&$]  
        Set oFSO = Nothing pa> p%  
        Return UBound( lineArray ) =Y/}b\9`T  
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    End Function PL9<*.U"=  
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    Sub GetFileList( ByVal in_dir As String, _ FMoJ"6Q  
                     ByRef in_flist() As String ) Fs?( UM  
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        'Redimension the file list array ?Y%}(3y  
        Erase in_flist uFz/PDOZ@  
    0K&_D)  
        'Tracks how many files are found BHEs+ e0  
        Dim fCount As Long 4tbw*H5!5  
        fCount = 0  o1 jk=  
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        'Recurse directory and search for text files SRP5P,-y  
        Dim f As String )>ug{M%g  
        f = Dir$(in_dir & "*.txt") >Dk1axZ!>/  
        While f <> "" O'"YJ,  
            ReDim Preserve in_flist(fCount) H~~7~1"x  
            in_flist(fCount) = f &,^mM' C  
            fCount += 1 c$@`P  
            f = Dir$() G%xb0%oi]%  
        Wend lq;  
        ReDim Preserve in_flist(fCount-1) ll^Th >  
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    End Sub OD{5m(JwL  
     
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