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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 正序阅读 楼主  发表于: 2020-12-15
    摘要 J6f;dF^  
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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 ybB/sShGM  
    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。 lRentNg0b  
    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。 ZT|E1[Q  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 lN^L#m*@  
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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。 Z*kg= hs^  
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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) 3Vt-]DGX  
    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 tn:9  
    例如下所示: 0y6nMI  
    Sample name:  EDF-C1-56 7gPkg63  
    Merging data from file EDF-C1-56 0-0.txt #&Biu }4D  
    Finished merging RPC data for sample EDF-C1-56 18|H  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt )Ax1?Nx$  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 UWmWouA  
    a. 创建一个新的散射库 U3p=H^MB.  
    b. 散射模型命名 L2Mcs  
    c. 改变散射模型为“Tabulated BSDF”. Yuh t<:`  
    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 ) =Y /  
    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。 8Zwq:lV Q  
    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 HnU}Lhjzj  
    g. 点击OK jcevpKkRG  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Ro? 4tGn  
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    脚本代码 V,&s$eQC  
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    '#Language "WWB-COM" hPhN7E03  
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    Option Explicit Xgop1  
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    Sub Main ,AACE7%l  
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        'Cleanup 5C2 *f 4|  
        ClearOutputWindow()  27w]Q_C  
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        Print "Merging RPC Photonics BSDF Data Files" e WcS>N  
        SetTextColor(255,0,0) epz2d~;  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." = V%s^  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." R.+Q K6B&  
        SetTextColor(0,0,0) :DQHb"(  
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        'Current directory of this script (should be the same as the text files being merged) 4,T S1H  
        Dim cDir As String @P[Tu; 4  
        cDir = MacroDir$ & "\" glPOW  
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        'Array which will be populated with the list of files to be merged IjJ3./L!5  
        Dim fList() As String, curFile As String Bd)Qz(>rw  
        GetFileList( cDir, fList ) Q4q3M=0  
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        Print "" ^;Ap-2Ww  
        Print "Files found for merging:" > : \lDz  
        For Each curFile In fList zj"J~s;?  
            Print Chr(9) & curFile j9%=8Dn.<  
        Next V$<og  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. :] {+ 3A  
        Dim nameArray() As String, sampName As String MS><7lk-  
        nameArray = Split(fList(0)," 0-0.txt")  `q%Z/!}  
        sampName  = nameArray(0)  fW|1AUD,  
        Print "" 'Pr(7^  
        Print "Sample name: " & Chr(9) & sampName pA4oy  
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        'Open an output file and write the FRED header data 9`QWqu[  
        Dim outFile As String ~vBmW_j  
        outFile = cDir & sampName & "_FRED.txt" YD7i6A  
        Open outFile For Output As #1 `R=8=6Z+$q  
        Print #1, "type bsdf_data" q_ ']i6  
        Print #1, "format angles=deg bsdf=value scale=1" [6)`wi  
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        'Loop the file list, skip the two header lines and write the remaining data to file +n9]c~g!T0  
        Dim lineArray() As String, curLine As Long RY&Wvkjh  
        For Each curFile In fList ~z%K9YcyU  
            Print "Merging data from file " & curFile 7*~ rhQ  
            ReadFile( cDir & curFile, lineArray ) TV0(uMZ0+'  
            For curLine = 2 To UBound(lineArray) mEr* n  
                Print #1, lineArray(curLine) 7bCTR2e\@w  
            Next ``$At,m  
        Next ko $bCG%  
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        'Close the output file cAV9.VS<L  
        Close #1 9Clddjf?c  
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        Print "Finished merging RPC data for sample " & sampName e*Sv}4e=.  
        Print "FRED formatted data file: " & Chr(9) & outFile # ]&=]K1V  
    End Sub T/dchWG  
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    'Utility function to read the contents of a file into an array of strings. v/}M _E  
    Function ReadFile(ByVal fileName As String, _ $xa#+  
                      ByRef lineArray() As String) As Long -Q<3Q_  
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        ReadFile = -1 I[WW1P5  
        Dim oFSO As Object a UAPh  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Q!z g=_z-  
        Erase lineArray uhbo/7d'7  
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        Dim fid As Long :p%nQF,*f  
        If oFSO.fileexists( fileName ) Then U[ u9RB  
            fid = FreeFile() >-c;  
            Open fileName For Input As fid IM7k\  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) $DJp|(8  
            Close fid Qj VP]C}p  
        End If ;.'2ZNt2  
        Set oFSO = Nothing ]SFB_5Gb  
        Return UBound( lineArray ) oJvF)d@gU  
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    End Function  # G0jMQ  
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    Sub GetFileList( ByVal in_dir As String, _ 'd D d9  
                     ByRef in_flist() As String ) q{[}*%  
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        'Redimension the file list array TGY^,H>J  
        Erase in_flist %AF~Ki  
    _6;T /_R=  
        'Tracks how many files are found !6'j W!  
        Dim fCount As Long hIuK s5`  
        fCount = 0 hS OAjS  
    ;sT7c1X^!  
        'Recurse directory and search for text files X25cU{  
        Dim f As String &$ia#j{l  
        f = Dir$(in_dir & "*.txt") .-k\Q} D  
        While f <> "" hvnZ 2x.?d  
            ReDim Preserve in_flist(fCount) L!|c: 8  
            in_flist(fCount) = f k$9oUE,  
            fCount += 1 ygW,4Vz7J  
            f = Dir$() rgWGe6;!  
        Wend _Y40a+hk]  
        ReDim Preserve in_flist(fCount-1) _8)9I?jH  
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    End Sub N5Eb.a9S  
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