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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 |0p'p$%  
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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 MDt?7c  
    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。 P^W47 SO  
    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。 tb3fz")UC  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤  _Qc\v0%  
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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。 8-YrmP2k  
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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) 4+,Z'J%\[7  
    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 ! -@!u   
    例如下所示: va2A@U  
    Sample name:  EDF-C1-56 J?fh3RW9  
    Merging data from file EDF-C1-56 0-0.txt E,yK` mPp^  
    Finished merging RPC data for sample EDF-C1-56 (OQ @!R&  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt q.{/{9  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 \w[%n0  
    a. 创建一个新的散射库 m]q!y3  
    b. 散射模型命名 2tm-:CPG  
    c. 改变散射模型为“Tabulated BSDF”. \zL7 j 4  
    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 ) N\p]+[6  
    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。 v=-3 ,C  
    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&~U<Z  
    g. 点击OK w{EU9C  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 #q.G_-H4J@  
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    脚本代码 ld:alEo  
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    '#Language "WWB-COM" KXCmCn  
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    Option Explicit 3eP0v  
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    Sub Main L b;vrh;A  
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        'Cleanup }(EOQ2TI  
        ClearOutputWindow() dU^<7 K:S  
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        Print "Merging RPC Photonics BSDF Data Files" \&)W#8V  
        SetTextColor(255,0,0) `h5eej&s(  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." JMl hBh  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Er1u1@  
        SetTextColor(0,0,0) ~7WXjVZ  
    >1I2R/'  
        'Current directory of this script (should be the same as the text files being merged) HKN"$(Q  
        Dim cDir As String e`M]ZG rr  
        cDir = MacroDir$ & "\" UZXcKl>u  
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        'Array which will be populated with the list of files to be merged RTBBb:eX  
        Dim fList() As String, curFile As String B00wcYM<1r  
        GetFileList( cDir, fList ) `G0rF\[  
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        Print "" Zbh]SF{3F  
        Print "Files found for merging:" 3b\8907  
        For Each curFile In fList 1za'u_  
            Print Chr(9) & curFile yZ)aKwj%U  
        Next ]N <]  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. aevG<|qP  
        Dim nameArray() As String, sampName As String >VUQTg  
        nameArray = Split(fList(0)," 0-0.txt") 7h#faOP  
        sampName  = nameArray(0) V0 +k3H  
        Print "" 3kqV_Pjg  
        Print "Sample name: " & Chr(9) & sampName &DQ4=/Z  
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        'Open an output file and write the FRED header data +[8Kl=]L  
        Dim outFile As String ~73i^3yf  
        outFile = cDir & sampName & "_FRED.txt" '}pgUh_  
        Open outFile For Output As #1 0"qim0%|DF  
        Print #1, "type bsdf_data" 0Q- Mxcj  
        Print #1, "format angles=deg bsdf=value scale=1" OWXye4`*  
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        'Loop the file list, skip the two header lines and write the remaining data to file H@2"ove-uC  
        Dim lineArray() As String, curLine As Long Ma=6kX]  
        For Each curFile In fList tGO[A#9a  
            Print "Merging data from file " & curFile Ie&b <k  
            ReadFile( cDir & curFile, lineArray ) feI[M;7u  
            For curLine = 2 To UBound(lineArray) +>WC^s  
                Print #1, lineArray(curLine) JQ/t, v$G  
            Next j*La ,iF  
        Next S|q!? /jqj  
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        'Close the output file 2~&hstd%  
        Close #1 9oz(=R  
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        Print "Finished merging RPC data for sample " & sampName 60aKT:KLC_  
        Print "FRED formatted data file: " & Chr(9) & outFile &I}T<v{f  
    End Sub "?eH=!  
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    'Utility function to read the contents of a file into an array of strings. jq("D,  
    Function ReadFile(ByVal fileName As String, _ FSU%?PxO  
                      ByRef lineArray() As String) As Long )}Rfa}MD  
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        ReadFile = -1 wsJ%* eYf  
        Dim oFSO As Object 7moElh v  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ^?s~Fk_V  
        Erase lineArray TXJY2J*24  
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        Dim fid As Long u JQaHL!  
        If oFSO.fileexists( fileName ) Then iJZ|[jEDV  
            fid = FreeFile() Kl aZZJ  
            Open fileName For Input As fid .A*VLF*m  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) zD)IU_GWa  
            Close fid ckf<N9  
        End If KZrMf77=  
        Set oFSO = Nothing $W/+nmb)@K  
        Return UBound( lineArray ) p]h*6nH>~  
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    End Function $h 08Z  
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    Sub GetFileList( ByVal in_dir As String, _ Tf#2"(!  
                     ByRef in_flist() As String ) H}sS4[z  
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        'Redimension the file list array bB:r]*_ s]  
        Erase in_flist -Wlp=#9  
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        'Tracks how many files are found e8AjO$49  
        Dim fCount As Long Xq,UV  
        fCount = 0 M[YTk=IM#  
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        'Recurse directory and search for text files =f4[=C$&`  
        Dim f As String ':4}O#  
        f = Dir$(in_dir & "*.txt") cBLR#Yu;O5  
        While f <> "" %NT`C9][  
            ReDim Preserve in_flist(fCount) OU,PO2xX9  
            in_flist(fCount) = f n5Nan  
            fCount += 1 aNE9LAms  
            f = Dir$() 3XeXzPj  
        Wend 4<G?  
        ReDim Preserve in_flist(fCount-1) *xE"8pN/  
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    End Sub .D8~)ZWN  
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