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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 N=OS\pz  
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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。
    +68+PhHF  
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    背景 v#RW{kI  
    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。 Gs+\D0o!  
    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。 :|Z$3q  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 6!ZVd#OM%  
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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。 ,`;jvY~Ec  
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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) Ds {{J5Um%  
    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 >R(8/#|E  
    例如下所示: 3>i>@n_  
    Sample name:  EDF-C1-56 u FMIY(vB  
    Merging data from file EDF-C1-56 0-0.txt *Wzwbwg  
    Finished merging RPC data for sample EDF-C1-56 JxjP@nr  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt !tI=`Ml[  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 A^pu  
    a. 创建一个新的散射库 d4%dIR)  
    b. 散射模型命名 4py(R-8\  
    c. 改变散射模型为“Tabulated BSDF”. Y5HfN[u^7  
    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 ) (YIhTSL"]  
    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。 HeCcF+  
    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 :v`o6x8  
    g. 点击OK =K :(&6f<t  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 +L0J_.5%^  
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    脚本代码 tG/1pW  
    \yM-O-{  
    '#Language "WWB-COM" v51EXf  
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    Option Explicit {1~9vHAZ  
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    Sub Main ; yyO0Ha  
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        'Cleanup ` K w7"  
        ClearOutputWindow() k5a\Sq}  
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        Print "Merging RPC Photonics BSDF Data Files" *wwhZe4V  
        SetTextColor(255,0,0) 6^sHgYR  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." m=QCG)s  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." =N_,l'U\^  
        SetTextColor(0,0,0) eZNitGaU  
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        'Current directory of this script (should be the same as the text files being merged) 84'?u m  
        Dim cDir As String Y;,Hzmbs6w  
        cDir = MacroDir$ & "\" ~Eq\DK  
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        'Array which will be populated with the list of files to be merged "x&3Z@q7  
        Dim fList() As String, curFile As String kg3ppt  
        GetFileList( cDir, fList ) 0O~p7D  
    )Pli})   
        Print "" &3Tx@XhO  
        Print "Files found for merging:" 8%[HYgd5)  
        For Each curFile In fList _UkmYZ/  
            Print Chr(9) & curFile gLIT;BK  
        Next Jf)3< ~G  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. oEu>}JD  
        Dim nameArray() As String, sampName As String ~GG?GB  
        nameArray = Split(fList(0)," 0-0.txt") <qhBc:kc  
        sampName  = nameArray(0) s*Ih_Ag=:  
        Print "" ,-'4L9  
        Print "Sample name: " & Chr(9) & sampName C0fmmI0z~  
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        'Open an output file and write the FRED header data C c*( {  
        Dim outFile As String ~F w<eY  
        outFile = cDir & sampName & "_FRED.txt" o9Sn*p-.  
        Open outFile For Output As #1 &aPl`"j  
        Print #1, "type bsdf_data" MdC<4^|  
        Print #1, "format angles=deg bsdf=value scale=1" xhw-2dl*H  
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        'Loop the file list, skip the two header lines and write the remaining data to file ,+._;[k  
        Dim lineArray() As String, curLine As Long bU`=*  
        For Each curFile In fList 2yKz-"E  
            Print "Merging data from file " & curFile 5j{Np,K  
            ReadFile( cDir & curFile, lineArray ) j$x)pB3]  
            For curLine = 2 To UBound(lineArray) S &JJIFftO  
                Print #1, lineArray(curLine) n|i"S`  
            Next \DA$6w\\  
        Next wqD5d   
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        'Close the output file "&lN\&:  
        Close #1 LK}-lZ` i  
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        Print "Finished merging RPC data for sample " & sampName * OsU Y=;  
        Print "FRED formatted data file: " & Chr(9) & outFile '<@=vGsye  
    End Sub &Y7C0v  
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    'Utility function to read the contents of a file into an array of strings. *Msr15  
    Function ReadFile(ByVal fileName As String, _ 7>i2OBkAhB  
                      ByRef lineArray() As String) As Long F9H~k"_ZJR  
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        ReadFile = -1 b2 kWjg.4  
        Dim oFSO As Object 1f4 bt6[  
        Set oFSO = CreateObject("Scripting.FileSystemObject") dqe7sZl!  
        Erase lineArray 6^#uLp>  
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        Dim fid As Long =Q(vni83<  
        If oFSO.fileexists( fileName ) Then @Bs0Avj.  
            fid = FreeFile() "Xn%at4  
            Open fileName For Input As fid R1ktj  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) (~s|=Hxq|-  
            Close fid $h28(K%  
        End If 5j^NV&/_  
        Set oFSO = Nothing 2~c~{ jl\  
        Return UBound( lineArray ) O~@fXMthh  
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    End Function n56;m`IU  
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    Sub GetFileList( ByVal in_dir As String, _ J]pa4C`  
                     ByRef in_flist() As String ) o6}n8U}bk  
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        'Redimension the file list array .g% Y@r)=5  
        Erase in_flist #^rU x.  
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        'Tracks how many files are found oq;'eM1,.  
        Dim fCount As Long RL}KAGK  
        fCount = 0 =P^wh  
    Xl%0/ o  
        'Recurse directory and search for text files cH D%{xlb  
        Dim f As String X-JV'KE}^z  
        f = Dir$(in_dir & "*.txt") K7`YJp`i  
        While f <> "" . (`3JQ2s  
            ReDim Preserve in_flist(fCount)  Mm= Mz  
            in_flist(fCount) = f tRfm+hqRZ  
            fCount += 1 y' xF0  
            f = Dir$() :q+N&j'3  
        Wend >nn Y:7m  
        ReDim Preserve in_flist(fCount-1) 3071:W  
    X K>&$<5{  
    End Sub $v27]"]  
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