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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 (U&tt]|  
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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 3kw,(-'1  
    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。 DK$X2B"cV  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 -m)X]]~C  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 I KqQ>Z-q~  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 7op`s5i  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) D&od?3}E  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ti5mIW\  
    例如下所示: M$y+q ^  
    Sample name:  EDF-C1-56 (zgW%{V@  
    Merging data from file EDF-C1-56 0-0.txt S]bmS6#  
    Finished merging RPC data for sample EDF-C1-56 Cbg!:Cws  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt *AG#316  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ZvNJ^Xz  
    a. 创建一个新的散射库 /j4P9y^]=  
    b. 散射模型命名 JW{rA6?   
    c. 改变散射模型为“Tabulated BSDF”. p~SClaR3H  
    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 ) XlV0*}S  
    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。 y+X2Pl  
    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 Fpm|_f7  
    g. 点击OK '?!zG{x  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 YUx.BZf7  
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    脚本代码 >[9J?H  
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    '#Language "WWB-COM" >OL3H$F  
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    Option Explicit 4[;X{ !  
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    Sub Main /.3}aj;6  
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        'Cleanup S4'   
        ClearOutputWindow() UELy"z R  
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        Print "Merging RPC Photonics BSDF Data Files" S& S Q  
        SetTextColor(255,0,0) 87BHq)  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Z1 Bp+a3  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 6%t1bM a  
        SetTextColor(0,0,0) A;*d}Xe&J  
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        'Current directory of this script (should be the same as the text files being merged) spdvZU=}  
        Dim cDir As String ]!I7Y.w6  
        cDir = MacroDir$ & "\" pnjXf.g"O  
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        'Array which will be populated with the list of files to be merged +_; l|uhT;  
        Dim fList() As String, curFile As String v-#Q7T  
        GetFileList( cDir, fList ) SSPHhAeH8  
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        Print "" ,{BaePMp  
        Print "Files found for merging:" |2RC#]/-Y  
        For Each curFile In fList 1`(tf6op  
            Print Chr(9) & curFile lwrC pD .  
        Next !9[>L@#G  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. \MbB#  
        Dim nameArray() As String, sampName As String [3(7  4  
        nameArray = Split(fList(0)," 0-0.txt") d Vj_8>  
        sampName  = nameArray(0) }q $5ig  
        Print "" AyNI$Q6Z  
        Print "Sample name: " & Chr(9) & sampName 4Uphfzv3D  
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        'Open an output file and write the FRED header data !ePr5On  
        Dim outFile As String cd(GvX'  
        outFile = cDir & sampName & "_FRED.txt" F({HP)9b  
        Open outFile For Output As #1 D)j(,vt  
        Print #1, "type bsdf_data" qAn!RkA  
        Print #1, "format angles=deg bsdf=value scale=1" MCS8y+QK  
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        'Loop the file list, skip the two header lines and write the remaining data to file ^G4 P y<s  
        Dim lineArray() As String, curLine As Long |G?htZF  
        For Each curFile In fList Q4+gAS9  
            Print "Merging data from file " & curFile iPd[l {85Z  
            ReadFile( cDir & curFile, lineArray ) 7J EbH?lEN  
            For curLine = 2 To UBound(lineArray) aMtsmL?=  
                Print #1, lineArray(curLine) |N%fMPKa  
            Next )L#i%)+  
        Next "JlpU-8[0@  
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        'Close the output file rEB @$C^  
        Close #1 QR%mj*@Wle  
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        Print "Finished merging RPC data for sample " & sampName \Ta"}TF8  
        Print "FRED formatted data file: " & Chr(9) & outFile ~8GFQ ph  
    End Sub Fs9I7~L3  
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    'Utility function to read the contents of a file into an array of strings. fh](K'P#^  
    Function ReadFile(ByVal fileName As String, _ 9~p[  
                      ByRef lineArray() As String) As Long j`~Ms>  
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        ReadFile = -1 Tk5W'p|6f  
        Dim oFSO As Object a-=8xs'  
        Set oFSO = CreateObject("Scripting.FileSystemObject") /ro=?QYb  
        Erase lineArray thifRd$4  
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        Dim fid As Long "Y~:|?(@-  
        If oFSO.fileexists( fileName ) Then [n \2  
            fid = FreeFile() S7/eS)SQR  
            Open fileName For Input As fid 4\Tl\SZ?  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) :9QZPsL  
            Close fid 2E}*v5b,  
        End If 0=AVW`J  
        Set oFSO = Nothing 9f&C  
        Return UBound( lineArray ) KX'{[7}m'  
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    End Function ;#vKi0V7  
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    Sub GetFileList( ByVal in_dir As String, _ q,93nhs "  
                     ByRef in_flist() As String ) ]x(e&fyHB  
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        'Redimension the file list array L.S;J[a;  
        Erase in_flist TFkZpe;  
    '}B+r@YCN  
        'Tracks how many files are found 1*9U1\z  
        Dim fCount As Long YoBPLS`K  
        fCount = 0 e\!0<d  
    Z -W(l<  
        'Recurse directory and search for text files inh=WUEW  
        Dim f As String eHn7iuS8  
        f = Dir$(in_dir & "*.txt") A v2 08}Y  
        While f <> "" +@p% p  
            ReDim Preserve in_flist(fCount) + HK8jCa  
            in_flist(fCount) = f ]G5 w6&d  
            fCount += 1 -* WXMzr  
            f = Dir$() &jslyQ#  
        Wend }BZ"S-hZ  
        ReDim Preserve in_flist(fCount-1) ?o81E2TJO  
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    End Sub BD_Iz A<wK  
     
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