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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: 07-22
    摘要 NY w(hAPv  
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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  C3Z(k}  
    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。 4SO{cs t  
    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。 C/#/F#C  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 U}5KAi 9Z  
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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。 V#FLxITk  
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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) ZACn_gd[5  
    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 z>q_]U0  
    例如下所示: Tdp$laPO'  
    Sample name:  EDF-C1-56 jtJU 5Q  
    Merging data from file EDF-C1-56 0-0.txt L^Af3]]2  
    Finished merging RPC data for sample EDF-C1-56 !T1i_  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt U4/$4.'NQ  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 8XE0 p7  
    a. 创建一个新的散射库 X> KsbOZ  
    b. 散射模型命名 .5zJ bZ9  
    c. 改变散射模型为“Tabulated BSDF”. <i?-x&Q?=  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Z ISd0hV  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 jP]'gQ!-w  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 N{@ eV][Q  
    g. 点击OK n*|-"'j  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 F:U_gW?  
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    脚本代码 q3:' 69  
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    '#Language "WWB-COM" m]vr|:{6/  
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    Option Explicit my0->W%L  
    :@L5=2Z+  
    Sub Main HyMb-Us  
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        'Cleanup h Nwb.[  
        ClearOutputWindow() vUNE! j  
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        Print "Merging RPC Photonics BSDF Data Files" Fx\Re]~n  
        SetTextColor(255,0,0) sa ?;D  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." djp(s$:{4  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." w[_Uv4M  
        SetTextColor(0,0,0) AEJm/8,T  
    Sy55w={  
        'Current directory of this script (should be the same as the text files being merged) }Z=Qy;zk  
        Dim cDir As String W_EN4p~J  
        cDir = MacroDir$ & "\" XDQ1gg`  
    .j.=|5nVo4  
        'Array which will be populated with the list of files to be merged '{~ ej:  
        Dim fList() As String, curFile As String XQPJ(.G  
        GetFileList( cDir, fList ) ~>|U%3}]  
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        Print "" cm<3'#~Q?  
        Print "Files found for merging:" pcG q  
        For Each curFile In fList R& A.F+Zgt  
            Print Chr(9) & curFile 8a {gEZT,  
        Next [%y D,8  
    Q[^d{e*l  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 6]*qx5m`<l  
        Dim nameArray() As String, sampName As String C09@2M'  
        nameArray = Split(fList(0)," 0-0.txt") im"v75 tc  
        sampName  = nameArray(0) $Re %+2c  
        Print "" aDESO5  
        Print "Sample name: " & Chr(9) & sampName +{Ttv7l_2  
    *,u{~(thR  
        'Open an output file and write the FRED header data xOH@V4z:  
        Dim outFile As String (A_9;uL^_  
        outFile = cDir & sampName & "_FRED.txt" ^q$sCt}  
        Open outFile For Output As #1 Wj0([n  
        Print #1, "type bsdf_data" ijfT!W  
        Print #1, "format angles=deg bsdf=value scale=1" #kA+Yqy \)  
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        'Loop the file list, skip the two header lines and write the remaining data to file 3ly|y{M",  
        Dim lineArray() As String, curLine As Long ~}fpe>M:  
        For Each curFile In fList li?Gb1  
            Print "Merging data from file " & curFile bV ym  
            ReadFile( cDir & curFile, lineArray ) M*Xzr .6  
            For curLine = 2 To UBound(lineArray) z!tHn#  
                Print #1, lineArray(curLine) OB:G5B`  
            Next Wk?XlCj  
        Next ~rD* Y&#.  
    +9t@eHJT1  
        'Close the output file #+$z`C`  
        Close #1 tfO _b5g  
    /}wGmX! -!  
        Print "Finished merging RPC data for sample " & sampName ]4PG[9J@  
        Print "FRED formatted data file: " & Chr(9) & outFile /C"E*a  
    End Sub :Fh* 4 &Z  
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    'Utility function to read the contents of a file into an array of strings. G|V ^C_:  
    Function ReadFile(ByVal fileName As String, _ g_`8K,6ln  
                      ByRef lineArray() As String) As Long | =&r) ~  
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        ReadFile = -1 umciP  
        Dim oFSO As Object NW$Z}?I  
        Set oFSO = CreateObject("Scripting.FileSystemObject") xZhh%~  
        Erase lineArray oPi)#|jcb  
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        Dim fid As Long O1QHG'00  
        If oFSO.fileexists( fileName ) Then ~dv C$   
            fid = FreeFile() aDs[\ '  
            Open fileName For Input As fid 7J\I%r  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) )<+Z,6  
            Close fid T ^uBMDYe  
        End If 0 }q/VH57  
        Set oFSO = Nothing 'n\ZmG{  
        Return UBound( lineArray ) *%8dW  
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    End Function Q-AN~k8+)[  
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    Sub GetFileList( ByVal in_dir As String, _ -k'=s{iy  
                     ByRef in_flist() As String ) QJxcH$  
    W /IyF){  
        'Redimension the file list array "p<f#s}  
        Erase in_flist 3N?uY2  
    mIOx)`$  
        'Tracks how many files are found K}6}Opr,Tt  
        Dim fCount As Long 8YCtU9D  
        fCount = 0 [qc90)^Q,  
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        'Recurse directory and search for text files avdi9!J2  
        Dim f As String OA[w|Tt  
        f = Dir$(in_dir & "*.txt") 7p|Pv;wp|  
        While f <> "" ~s+\Y/@A  
            ReDim Preserve in_flist(fCount) kIQMIL0+  
            in_flist(fCount) = f T. {P}#'|  
            fCount += 1 [mX\Q`)QP  
            f = Dir$() iidK}<o  
        Wend ?=aQG0  
        ReDim Preserve in_flist(fCount-1) pDW .Pav  
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    End Sub (xMAo;s_  
     
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