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    [分享]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: 2020-12-15
    摘要 Q@UY4gA '  
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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 ]JI A\|b6  
    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。 ;!>>C0s"  
    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。 rX&?Xi1JeV  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 m3_)UIJZ  
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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。 5{8,+ Z  
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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) GJuU?h#:/{  
    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 H0mDs7  
    例如下所示: e9?y0vT//  
    Sample name:  EDF-C1-56 3bB%@^<  
    Merging data from file EDF-C1-56 0-0.txt kc:2ID&  
    Finished merging RPC data for sample EDF-C1-56 h$fC/Juit  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt gJBk&SDgtP  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,[Z;"wE  
    a. 创建一个新的散射库 >(a/K2$*1  
    b. 散射模型命名 2E3x=  
    c. 改变散射模型为“Tabulated BSDF”. q]t^6m&-  
    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 ) .w]S!=h  
    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。 J7rfHhz  
    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 <8/lHQ^\)  
    g. 点击OK S8Yh>j8-  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 iD9hqiX&  
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    脚本代码 }L*cP;m#  
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    '#Language "WWB-COM" LIHf]+  
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    Option Explicit cj/FqU"  
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    Sub Main :YZMR JL  
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        'Cleanup c}FZb$q#  
        ClearOutputWindow() :dzam HbX9  
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        Print "Merging RPC Photonics BSDF Data Files" c^8y/wfok  
        SetTextColor(255,0,0) }' t*BaU  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." (wIpq<%  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." [VP ~~*b  
        SetTextColor(0,0,0) ffYiu4$m  
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        'Current directory of this script (should be the same as the text files being merged) ysiBru[u  
        Dim cDir As String =>6'{32W_  
        cDir = MacroDir$ & "\" XX(;,[(_  
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        'Array which will be populated with the list of files to be merged [(N<E/m%B  
        Dim fList() As String, curFile As String etH%E aF[  
        GetFileList( cDir, fList ) r yO\$m  
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        Print "" ;=6~,k)  
        Print "Files found for merging:" bXiT}5mJU  
        For Each curFile In fList Sf\mg4,  
            Print Chr(9) & curFile I(Yyg,1Z  
        Next #X"eg  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. lH^[b[  
        Dim nameArray() As String, sampName As String gI^*O@Q4{b  
        nameArray = Split(fList(0)," 0-0.txt") o3l_&?^  
        sampName  = nameArray(0) U.G**v  
        Print "" !}^ {W)h[  
        Print "Sample name: " & Chr(9) & sampName ]f q.r  
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        'Open an output file and write the FRED header data LdAfY0  
        Dim outFile As String v7/qJ9l  
        outFile = cDir & sampName & "_FRED.txt" `:A`%Fg8<  
        Open outFile For Output As #1 !285=cxz  
        Print #1, "type bsdf_data" yg gQ4y6  
        Print #1, "format angles=deg bsdf=value scale=1" X &6p_Lo  
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        'Loop the file list, skip the two header lines and write the remaining data to file Hay`lA2@  
        Dim lineArray() As String, curLine As Long ?8n`4yO0  
        For Each curFile In fList B@l/'$G  
            Print "Merging data from file " & curFile ,!3G  
            ReadFile( cDir & curFile, lineArray ) 7!`,P  
            For curLine = 2 To UBound(lineArray) u%S&EuX  
                Print #1, lineArray(curLine) Q': }'CI  
            Next ,xrXby|R"  
        Next *O|Z[>  
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        'Close the output file PK5xnT:  
        Close #1 ^~2GhveBV  
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        Print "Finished merging RPC data for sample " & sampName 2mbZ6'p {  
        Print "FRED formatted data file: " & Chr(9) & outFile ?*a:f"vQ  
    End Sub %uyRpG3,  
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    'Utility function to read the contents of a file into an array of strings. ajW[}/)  
    Function ReadFile(ByVal fileName As String, _ tm(.a ?p  
                      ByRef lineArray() As String) As Long 2*5Z| 3aX  
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        ReadFile = -1 \&J7>vu^y  
        Dim oFSO As Object e@6<mir[4  
        Set oFSO = CreateObject("Scripting.FileSystemObject") XFPWW,  
        Erase lineArray 4QZ -7_  
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        Dim fid As Long !h{qO&ZH=  
        If oFSO.fileexists( fileName ) Then |Gb"%5YD  
            fid = FreeFile() VAF+\Cea=  
            Open fileName For Input As fid #m6 eG&a  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) u~6`9'Ms  
            Close fid ]C-hl}iq  
        End If E/9 U0  
        Set oFSO = Nothing hV/$6 8A_  
        Return UBound( lineArray ) 2;NIUMAMM  
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    End Function AS[cz! >  
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    Sub GetFileList( ByVal in_dir As String, _ JB a:))lw  
                     ByRef in_flist() As String ) }| _uqvin  
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        'Redimension the file list array it!8+hvq9*  
        Erase in_flist &+=A;Y)  
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        'Tracks how many files are found `AeId/A4n  
        Dim fCount As Long +s c|PB  
        fCount = 0 <SUjz}_Oa:  
    ,L^eD>|j5  
        'Recurse directory and search for text files L{;q^  
        Dim f As String k`6T% [D]  
        f = Dir$(in_dir & "*.txt") ^$Dpdz I  
        While f <> "" l)fF)\|;=  
            ReDim Preserve in_flist(fCount) ^_r8R__S:  
            in_flist(fCount) = f DHJh.Y@H  
            fCount += 1 <P7f\$o~  
            f = Dir$() .0S.7w3dZo  
        Wend gd-4hR  
        ReDim Preserve in_flist(fCount-1) a-,!K  
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    End Sub ^wCjMi(sj  
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