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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 ;(TBg-LEK  
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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 0 l G\QT  
    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。  w~&bpCB!  
    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。 rL&585  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ^5QSV\X  
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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_vpr]}P  
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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) fb&K.6"  
    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 _H<ur?G  
    例如下所示: :q0C$xF  
    Sample name:  EDF-C1-56 V92e#AR  
    Merging data from file EDF-C1-56 0-0.txt xGPt5l<M&  
    Finished merging RPC data for sample EDF-C1-56 !>  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6TlkPM$~2  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2px l!  
    a. 创建一个新的散射库 F#O.i,  
    b. 散射模型命名 a:H}c9 $%  
    c. 改变散射模型为“Tabulated BSDF”. u L/*,[}'  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ATPc ~f  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 \E]s]ft;+  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 P=(\3ok  
    g. 点击OK SN\;&(?G  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [{f{E  
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    脚本代码 s <Ag8U8  
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    '#Language "WWB-COM" V)_mo/D!D  
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    Option Explicit 3#^xxEu  
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    Sub Main O`rAqO0F  
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        'Cleanup (LkGBnXE  
        ClearOutputWindow() L#m1!+J  
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        Print "Merging RPC Photonics BSDF Data Files" Qm^N}>e  
        SetTextColor(255,0,0) ,d&~#W]  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Vdh5s292h  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." G'#a&6  
        SetTextColor(0,0,0) bUU_NqUf*3  
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        'Current directory of this script (should be the same as the text files being merged) {UvZ  
        Dim cDir As String 2{| U  
        cDir = MacroDir$ & "\" ` ~VV1  
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        'Array which will be populated with the list of files to be merged ]* ':  
        Dim fList() As String, curFile As String AL3zE=BL  
        GetFileList( cDir, fList ) &5~bJ]P   
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        Print "" G%Wjtrpj  
        Print "Files found for merging:" Z_ak4C  
        For Each curFile In fList > ~J&i3  
            Print Chr(9) & curFile GbBcC#0  
        Next : v<|y F  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. zxT&K|  
        Dim nameArray() As String, sampName As String D-69/3PvP  
        nameArray = Split(fList(0)," 0-0.txt") [8l8 m6  
        sampName  = nameArray(0) ikw_t?  
        Print "" bX=A77  
        Print "Sample name: " & Chr(9) & sampName BJB'o  
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        'Open an output file and write the FRED header data 65)/|j+  
        Dim outFile As String !J3g,p*  
        outFile = cDir & sampName & "_FRED.txt" n B`pfg  
        Open outFile For Output As #1 Jx.Jx~  
        Print #1, "type bsdf_data" E}b" qOV  
        Print #1, "format angles=deg bsdf=value scale=1" [(F.x6z)  
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        'Loop the file list, skip the two header lines and write the remaining data to file tF O27z@  
        Dim lineArray() As String, curLine As Long ApG_Gd.  
        For Each curFile In fList X8GIRL)lJ  
            Print "Merging data from file " & curFile ,1a6u3f,  
            ReadFile( cDir & curFile, lineArray ) */u_RJ  
            For curLine = 2 To UBound(lineArray) HX7"w   
                Print #1, lineArray(curLine) L^Fni~  
            Next ~Yb5F YE  
        Next qa.nm4"6+  
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        'Close the output file 4`7N}$j#,  
        Close #1 <V5(5gx  
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        Print "Finished merging RPC data for sample " & sampName bd5\Rt  
        Print "FRED formatted data file: " & Chr(9) & outFile MRV4D<NQ  
    End Sub J4;w9[a$  
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    'Utility function to read the contents of a file into an array of strings. 4%Z!*W*  
    Function ReadFile(ByVal fileName As String, _ bzF>Efza  
                      ByRef lineArray() As String) As Long B8:G1r5G/  
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        ReadFile = -1 J NPEyC  
        Dim oFSO As Object N^*%{[<5  
        Set oFSO = CreateObject("Scripting.FileSystemObject") }~DlOvsq  
        Erase lineArray )+OI}  
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        Dim fid As Long a`  s2 z  
        If oFSO.fileexists( fileName ) Then "jb`KBH%"  
            fid = FreeFile() TWZ* *S-  
            Open fileName For Input As fid ;:4&nJ*qG  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) EZ:pcnL {  
            Close fid MzM"r"u  
        End If gFizw:l  
        Set oFSO = Nothing `*g(_EZsS  
        Return UBound( lineArray ) ~!;*C  
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    End Function ;|}N\[fk%]  
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    Sub GetFileList( ByVal in_dir As String, _ NvW`x   
                     ByRef in_flist() As String ) _2xNio&  
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        'Redimension the file list array B52n'.  
        Erase in_flist }Go?j# !  
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        'Tracks how many files are found LM\H%=*L  
        Dim fCount As Long Oi%\'biM  
        fCount = 0 "\cDSiD  
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        'Recurse directory and search for text files P{fT5K|  
        Dim f As String &W+lwEu  
        f = Dir$(in_dir & "*.txt") kl%%b"h'  
        While f <> "" +O"!*  
            ReDim Preserve in_flist(fCount) FjR/_GPo6  
            in_flist(fCount) = f @6h ,#8#  
            fCount += 1 IJa6W`}  
            f = Dir$() fIe';a  
        Wend  >M~1{  
        ReDim Preserve in_flist(fCount-1) D+m#_'ocL  
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    End Sub !ij R  
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