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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 RfvvX$  
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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 F)eP55C6  
    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。 (HeSL),1  
    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。 kP('X/  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 #huh!Mn  
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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。 4,QA {v  
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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) p8.JJt^  
    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 9 {SzE /[  
    例如下所示: OC,yLQ  
    Sample name:  EDF-C1-56 Z)(#D($-  
    Merging data from file EDF-C1-56 0-0.txt U5cbO{\ 3I  
    Finished merging RPC data for sample EDF-C1-56 vOKNBR2  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Xu#?Lw  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 # 7d vT=  
    a. 创建一个新的散射库 _f>)G3p  
    b. 散射模型命名 RlvvO  
    c. 改变散射模型为“Tabulated BSDF”. Bo ywgL|  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) qycf;Kl:6  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Q8l vwip  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 &y73^"%  
    g. 点击OK ft{i6}  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ZK2&l8  
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    脚本代码 O<>+l*bk  
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    '#Language "WWB-COM" ,:-^O#  
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    Option Explicit gV:0&g\v  
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    Sub Main %t9Kc9u3p  
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        'Cleanup ' MyJw*%b]  
        ClearOutputWindow() SZtSUt(ss  
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        Print "Merging RPC Photonics BSDF Data Files" 0$y HO2 f  
        SetTextColor(255,0,0) zC[LcC*+J  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." $j(4FyH\  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ?6N\AM '  
        SetTextColor(0,0,0) i8EKzW  
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        'Current directory of this script (should be the same as the text files being merged) l% %cU"  
        Dim cDir As String :m'(8s8  
        cDir = MacroDir$ & "\" q~AvxO  
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        'Array which will be populated with the list of files to be merged l96 AJB'  
        Dim fList() As String, curFile As String [%Dh0hOg  
        GetFileList( cDir, fList ) /@&uaw  
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        Print "" '}>8+vU`  
        Print "Files found for merging:" 3_eg'EP.E  
        For Each curFile In fList %.uN|o&n  
            Print Chr(9) & curFile 5(Q-||J  
        Next l`j@QP  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. NLgeBLB  
        Dim nameArray() As String, sampName As String 8|hi2Qeu,c  
        nameArray = Split(fList(0)," 0-0.txt") 3%x-^.  
        sampName  = nameArray(0) ]8cD,NS  
        Print "" D[YdPg@-  
        Print "Sample name: " & Chr(9) & sampName fl_a@QdB#  
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        'Open an output file and write the FRED header data DuQ:82 3b  
        Dim outFile As String 6,R<8a;Wn  
        outFile = cDir & sampName & "_FRED.txt" fv>Jn`  
        Open outFile For Output As #1 ^ilgd  
        Print #1, "type bsdf_data" LzB*d  
        Print #1, "format angles=deg bsdf=value scale=1" dW^#}kN7V  
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        'Loop the file list, skip the two header lines and write the remaining data to file T Q {8 ee{  
        Dim lineArray() As String, curLine As Long lrMkp@ f.  
        For Each curFile In fList GsqO^SV  
            Print "Merging data from file " & curFile *9r 32]i;  
            ReadFile( cDir & curFile, lineArray ) ;:)u rI?  
            For curLine = 2 To UBound(lineArray) N71^I"@HH  
                Print #1, lineArray(curLine) U!nNT==  
            Next Y$3liDeL=  
        Next o3OJI_ v &  
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        'Close the output file $@dPIq4o;}  
        Close #1 }L5;=A']S  
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        Print "Finished merging RPC data for sample " & sampName g-+/zEOUS  
        Print "FRED formatted data file: " & Chr(9) & outFile U4e9[=q`'  
    End Sub P\ 2Bx *e  
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    'Utility function to read the contents of a file into an array of strings. # kmI#W"^  
    Function ReadFile(ByVal fileName As String, _ 2l8z/o7v  
                      ByRef lineArray() As String) As Long /-3)^R2H  
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        ReadFile = -1 J\I`#  
        Dim oFSO As Object &G+:t)|S  
        Set oFSO = CreateObject("Scripting.FileSystemObject") KH[Oqd  
        Erase lineArray E{}eYU  
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        Dim fid As Long vRO`hGH  
        If oFSO.fileexists( fileName ) Then +$G P(Uu,  
            fid = FreeFile() j0e1CSE  
            Open fileName For Input As fid xSjs+Y;Mu  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) j 2Jew  
            Close fid o6:p2W  
        End If ~eGtoEY  
        Set oFSO = Nothing pkA(\0E8  
        Return UBound( lineArray ) ZpU4"x>  
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    End Function P-\T BS_O  
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    Sub GetFileList( ByVal in_dir As String, _ 54&&=NVs|  
                     ByRef in_flist() As String ) ^eqq|(<K  
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        'Redimension the file list array ]<E\J+5K  
        Erase in_flist t*!Q9GC_  
    Gh{vExH@5(  
        'Tracks how many files are found ZCkwK  
        Dim fCount As Long [UaM}-eR  
        fCount = 0 XE*#5u8t  
    .n| M5X  
        'Recurse directory and search for text files ,W;2A0A?X  
        Dim f As String *s"{JrG`O  
        f = Dir$(in_dir & "*.txt") <F5x}i~(C  
        While f <> "" N6S}u@{J~N  
            ReDim Preserve in_flist(fCount) l'(7p`?  
            in_flist(fCount) = f sMqAuhw$.  
            fCount += 1 rIF6^?  
            f = Dir$() kR(hUc1O  
        Wend 9xUAfU  
        ReDim Preserve in_flist(fCount-1) ?bK^IHh  
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    End Sub r}])V[V  
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