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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: 2023-05-11
    摘要 |EuWzhNAO  
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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 9s\;,!b  
    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。 Fw!CssW  
    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。 W)I)QinOH  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 3dG[dYj  
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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}v6!u|iZu  
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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) Zf~Em'g"3  
    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 W)^0~[`i  
    例如下所示: eC:?j`H -  
    Sample name:  EDF-C1-56 :d7Ju.*J  
    Merging data from file EDF-C1-56 0-0.txt %jKbRiz1u  
    Finished merging RPC data for sample EDF-C1-56 f8um.Xnp6  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt d4h1#MK  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 k 9 Xi|Yj  
    a. 创建一个新的散射库 V=}AFGC85  
    b. 散射模型命名 |IL..C  
    c. 改变散射模型为“Tabulated BSDF”. Iuk!A?XV  
    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 ) IHCEuK  
    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。 {f;]  
    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 T/Q#V)Tp  
    g. 点击OK $OK}jSH*v)  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ~Aul 7[IH  
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    脚本代码 m'&^\7;D  
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    '#Language "WWB-COM" K@u\^6419  
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    Option Explicit 9$F '*{8  
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    Sub Main KTX;x2r  
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        'Cleanup )*_4=-8H  
        ClearOutputWindow() ).HYW _Yih  
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        Print "Merging RPC Photonics BSDF Data Files" D^1H(y2zp  
        SetTextColor(255,0,0) :|i jCg+  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." w@U`@})r.  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." :_F$e  
        SetTextColor(0,0,0) |,k,X}gP  
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        'Current directory of this script (should be the same as the text files being merged) l n}2   
        Dim cDir As String 0^htwec!  
        cDir = MacroDir$ & "\" "NqB_?DT  
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        'Array which will be populated with the list of files to be merged V<f76U)  
        Dim fList() As String, curFile As String -x i]~svg  
        GetFileList( cDir, fList ) noz&4"S.{  
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        Print "" i6F`KF'i&  
        Print "Files found for merging:" z Qtg]@S  
        For Each curFile In fList -' 7I|r  
            Print Chr(9) & curFile > D:( HWL  
        Next 'LY.7cW  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement.  ?Y4$  
        Dim nameArray() As String, sampName As String RM2<%$  
        nameArray = Split(fList(0)," 0-0.txt") H%c:f  
        sampName  = nameArray(0) !o A,^4(  
        Print "" i^LLKx7M&  
        Print "Sample name: " & Chr(9) & sampName fba QXM  
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        'Open an output file and write the FRED header data M7rVH\:[-  
        Dim outFile As String '5j$wr zt  
        outFile = cDir & sampName & "_FRED.txt" 0&!,+  
        Open outFile For Output As #1 "0al"?  
        Print #1, "type bsdf_data" ^F @z +q  
        Print #1, "format angles=deg bsdf=value scale=1" AN ;SRl  
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        'Loop the file list, skip the two header lines and write the remaining data to file 3=( Gb  
        Dim lineArray() As String, curLine As Long 96Kv!  
        For Each curFile In fList E:,V{&tLK  
            Print "Merging data from file " & curFile tY=sl_  
            ReadFile( cDir & curFile, lineArray ) ]=T`8)_r)  
            For curLine = 2 To UBound(lineArray) <1~5l ~  
                Print #1, lineArray(curLine) :sD/IM",},  
            Next lFMQT ;  
        Next R~nbJx$  
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        'Close the output file |y+<|fb,a  
        Close #1 nZ>8r  
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        Print "Finished merging RPC data for sample " & sampName A1{ 7g<k6  
        Print "FRED formatted data file: " & Chr(9) & outFile 'xO5Le(=M  
    End Sub X.)caF^j  
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    'Utility function to read the contents of a file into an array of strings. gWcl@|I;\  
    Function ReadFile(ByVal fileName As String, _ s&-m!|P  
                      ByRef lineArray() As String) As Long `Oxo@G*@}W  
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        ReadFile = -1 1t"  
        Dim oFSO As Object E3bS Q  
        Set oFSO = CreateObject("Scripting.FileSystemObject") N;4tvWI  
        Erase lineArray pa1.+~)  
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        Dim fid As Long OV)J  
        If oFSO.fileexists( fileName ) Then !KiN} p  
            fid = FreeFile() D,FX&{TYU  
            Open fileName For Input As fid G,+-}~$_  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) >_9w4g_<  
            Close fid .GG6wL<$?  
        End If 4L'dV  
        Set oFSO = Nothing g]B! 29M  
        Return UBound( lineArray ) /:-8 ,`  
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    End Function [~cb&6|M  
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    Sub GetFileList( ByVal in_dir As String, _ ".Lwq_  
                     ByRef in_flist() As String ) !)1r{u  
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        'Redimension the file list array ,9T-\)sT  
        Erase in_flist .L;M-`^  
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        'Tracks how many files are found MXy~kb&  
        Dim fCount As Long y7[D9ZvZ  
        fCount = 0 3C8cvi[IS  
    ;0j 8Xj  
        'Recurse directory and search for text files S!*wK-  
        Dim f As String Uy8r !9O  
        f = Dir$(in_dir & "*.txt") Ko6>h  
        While f <> "" ";:"p6?  
            ReDim Preserve in_flist(fCount) ]xhZJ~"@u  
            in_flist(fCount) = f EJF*_<f9O  
            fCount += 1 4.?tP7UE  
            f = Dir$() 1A>>#M=A  
        Wend O3Jp:.ps  
        ReDim Preserve in_flist(fCount-1) qo2/?]  
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    End Sub CxyL'k  
     
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