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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
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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 irB}h!@  
    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。 "Nq5FcS9  
    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。 = P$7 "  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 oMq:4W,  
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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。 kO/;lrwC  
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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) HXqG;Fds(  
    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 O G7U+d6  
    例如下所示: +~lPf.  
    Sample name:  EDF-C1-56 ^Ri ; vM  
    Merging data from file EDF-C1-56 0-0.txt j(_6.zf  
    Finished merging RPC data for sample EDF-C1-56 3|/zlKZz  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt +]C|y ,r  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 :%zAX  
    a. 创建一个新的散射库 reoCyP\!!  
    b. 散射模型命名 !JjNm*F[  
    c. 改变散射模型为“Tabulated BSDF”. T(+*y  
    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 ) Nb>C5TjR  
    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。 5VLC\QgK^  
    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 dJ{'b '#  
    g. 点击OK U owbk:  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 XJ7mvLM;  
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    脚本代码 @iYr<>iDZ  
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    '#Language "WWB-COM" PV/hnVUl  
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    Option Explicit S%Z2J)H"  
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    Sub Main F4&`0y:  
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        'Cleanup 5jcy*G}[  
        ClearOutputWindow() `g(r.`t^  
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        Print "Merging RPC Photonics BSDF Data Files" qI1J M =  
        SetTextColor(255,0,0) ;J?zD9  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ItQ3|-^  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." {,o =K4CD  
        SetTextColor(0,0,0) (V8lmp-F  
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        'Current directory of this script (should be the same as the text files being merged) !O/(._YB`  
        Dim cDir As String 9J f.Ls  
        cDir = MacroDir$ & "\" }& e#b]&:*  
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        'Array which will be populated with the list of files to be merged 9%bqY9NFd  
        Dim fList() As String, curFile As String uhr&P4EW  
        GetFileList( cDir, fList ) h%%dRi  
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        Print "" |z.Z='`  
        Print "Files found for merging:"  ZG-[Gz  
        For Each curFile In fList sfEy  
            Print Chr(9) & curFile jb!15Vlt"  
        Next { daEKac5  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. w 8oIq*  
        Dim nameArray() As String, sampName As String 3 *[YM7y  
        nameArray = Split(fList(0)," 0-0.txt") <a$'tw-8  
        sampName  = nameArray(0)  *4{GI D  
        Print "" P }$DCD<$U  
        Print "Sample name: " & Chr(9) & sampName t3FfPV!P"  
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        'Open an output file and write the FRED header data ^CQVqa${]  
        Dim outFile As String ^/v!hq_#%&  
        outFile = cDir & sampName & "_FRED.txt" ^ )[jBUT  
        Open outFile For Output As #1 P{h$> 6c  
        Print #1, "type bsdf_data" $_0~Jzt,  
        Print #1, "format angles=deg bsdf=value scale=1" $_&gT.>  
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        'Loop the file list, skip the two header lines and write the remaining data to file #~@Cl9[)D  
        Dim lineArray() As String, curLine As Long ~;B@ {kFY)  
        For Each curFile In fList $tFmp)  
            Print "Merging data from file " & curFile lG!We'?  
            ReadFile( cDir & curFile, lineArray ) LuUfdzH  
            For curLine = 2 To UBound(lineArray) 2ID]it\5  
                Print #1, lineArray(curLine) [(4s\c  
            Next Ok6c E  
        Next p7d[)* L>C  
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        'Close the output file >ay% !X@3"  
        Close #1 !Won<:.[0  
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        Print "Finished merging RPC data for sample " & sampName sas:5iB5  
        Print "FRED formatted data file: " & Chr(9) & outFile d#]XyN>  
    End Sub (}NKW  
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    'Utility function to read the contents of a file into an array of strings. Hwm] l`E]  
    Function ReadFile(ByVal fileName As String, _ ~xaPq=AH  
                      ByRef lineArray() As String) As Long ,Z6\%:/  
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        ReadFile = -1 {Kkut?5  
        Dim oFSO As Object .q7|z3@,  
        Set oFSO = CreateObject("Scripting.FileSystemObject") :")iS?l  
        Erase lineArray fu6Ir,  
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        Dim fid As Long 'WLh D<  
        If oFSO.fileexists( fileName ) Then 12MWO_'g8  
            fid = FreeFile() )kiC/Y}k  
            Open fileName For Input As fid mU3 @|a/@0  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) y7)$~R):-  
            Close fid v*k}{M  
        End If \ZPmPu9^(  
        Set oFSO = Nothing *D$[@-7  
        Return UBound( lineArray ) )cd5iE:FO  
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    End Function iO_6>&(  
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    Sub GetFileList( ByVal in_dir As String, _ ZdjmZx%%  
                     ByRef in_flist() As String ) Xitsb f=Gg  
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        'Redimension the file list array Sx", Zb  
        Erase in_flist eURj'8o),  
    "<y0D!&  
        'Tracks how many files are found *[^[!'kT&  
        Dim fCount As Long [Q5>4WY  
        fCount = 0 p%+uv\Ix  
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        'Recurse directory and search for text files 4)XZ'~|  
        Dim f As String c0%.GcF0{  
        f = Dir$(in_dir & "*.txt") <+wbnnK  
        While f <> "" +7]]=e<[E  
            ReDim Preserve in_flist(fCount) wZ_k]{J  
            in_flist(fCount) = f -U"h3Ye^  
            fCount += 1 zJ2dPp~u  
            f = Dir$() Rt^~db  
        Wend !C$bOhc  
        ReDim Preserve in_flist(fCount-1) AQH\ ;L  
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    End Sub 9+o`/lk1  
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