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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 }kF*I@:g  
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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 &\5%C\0Z<  
    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。 EMw biGV  
    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。 +"3K)9H  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ^~DClZ  
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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。 tW \q;_DSr  
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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) e$4$G<8;y  
    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 qVr?st  
    例如下所示: (R^Ca7F  
    Sample name:  EDF-C1-56 p77  
    Merging data from file EDF-C1-56 0-0.txt F(;95TB  
    Finished merging RPC data for sample EDF-C1-56 #TD0)C/  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt vFH1hm  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 QmY1Bn?s  
    a. 创建一个新的散射库 u= ydX  
    b. 散射模型命名 f1RX`rXf  
    c. 改变散射模型为“Tabulated BSDF”. 9RnXp&w  
    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 ) ,H:{twc   
    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。 h%!N!\  
    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 `cpUl*Y=  
    g. 点击OK S)z5=N(Xz  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 X.)D"+xnH  
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    脚本代码 $LJCup,1"  
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    '#Language "WWB-COM" dH+oV`  
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    Option Explicit M|\C@,F]8  
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    Sub Main {U7A&e0eW  
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        'Cleanup #_4JTGJ  
        ClearOutputWindow() |<w Z;d  
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        Print "Merging RPC Photonics BSDF Data Files" IWP[?U=  
        SetTextColor(255,0,0) /+{1;}AT  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 9/4Bx!~A  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." "6xTh0D  
        SetTextColor(0,0,0) zR6^rq*  
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        'Current directory of this script (should be the same as the text files being merged) I+FQ2\J*H  
        Dim cDir As String X.hV MX2B  
        cDir = MacroDir$ & "\" (g#,AX  
    $+Zj)V(  
        'Array which will be populated with the list of files to be merged vGI?X#w3  
        Dim fList() As String, curFile As String UWW_[dJr   
        GetFileList( cDir, fList ) YRs32vVz  
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        Print "" 'qnnZE  
        Print "Files found for merging:" qFg"!w  
        For Each curFile In fList zx=AT  
            Print Chr(9) & curFile P4.snRQ  
        Next N cnL-k.  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. dRPX`%J  
        Dim nameArray() As String, sampName As String 6n5>{X  
        nameArray = Split(fList(0)," 0-0.txt") [SA$d`B/  
        sampName  = nameArray(0) Ialbz\;F2%  
        Print "" Gw0MDV&[  
        Print "Sample name: " & Chr(9) & sampName ;'xd8Jf  
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        'Open an output file and write the FRED header data 8 !+eq5S3  
        Dim outFile As String A3c&VT6Q  
        outFile = cDir & sampName & "_FRED.txt" m-)yQM8  
        Open outFile For Output As #1 T!pjv8y@R  
        Print #1, "type bsdf_data" Ceco^Mw  
        Print #1, "format angles=deg bsdf=value scale=1" _M9-n  
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        'Loop the file list, skip the two header lines and write the remaining data to file K_t! P  
        Dim lineArray() As String, curLine As Long _$YT*o@0J  
        For Each curFile In fList gyAKjLqqpi  
            Print "Merging data from file " & curFile ~lB:xVzn  
            ReadFile( cDir & curFile, lineArray ) 268H!'!\  
            For curLine = 2 To UBound(lineArray) Ij}k>qO/2  
                Print #1, lineArray(curLine) ';OZP2  
            Next ;^Y]nsd  
        Next ! fSM6Vo  
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        'Close the output file D?< R5zp  
        Close #1 Lr}>Md  
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        Print "Finished merging RPC data for sample " & sampName qD?-&>dBWi  
        Print "FRED formatted data file: " & Chr(9) & outFile 0'O*Y ]h+  
    End Sub XI*cu\7sy  
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    'Utility function to read the contents of a file into an array of strings. H<bK9k)E  
    Function ReadFile(ByVal fileName As String, _ XP'7+/A  
                      ByRef lineArray() As String) As Long BO 3%p  
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        ReadFile = -1 iQnIk| 8  
        Dim oFSO As Object XexslzI  
        Set oFSO = CreateObject("Scripting.FileSystemObject") {Y#$  
        Erase lineArray nax(V  
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        Dim fid As Long D%=FCmL5@=  
        If oFSO.fileexists( fileName ) Then 9X6l`bo'  
            fid = FreeFile() ,@]rvI6 x  
            Open fileName For Input As fid 3~&h9#7 Ke  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) !p#+I=  
            Close fid @3@oaa/v  
        End If {f kP|d  
        Set oFSO = Nothing K=`;D  
        Return UBound( lineArray ) si|DxDx  
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    End Function 4fp]z9Y  
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    Sub GetFileList( ByVal in_dir As String, _ = rLL5<  
                     ByRef in_flist() As String ) t@1 bu$y  
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        'Redimension the file list array |-SImxV  
        Erase in_flist 0cxk)l%  
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        'Tracks how many files are found }co*%F{1  
        Dim fCount As Long Zg#VZg1 2  
        fCount = 0 3.^Tm+ C  
    ?U;KwS]%  
        'Recurse directory and search for text files Qso"jYl<  
        Dim f As String |`50Tf\J  
        f = Dir$(in_dir & "*.txt") ZSo#vQ  
        While f <> "" 7^|,l  
            ReDim Preserve in_flist(fCount) o : t z_5  
            in_flist(fCount) = f HI}9 "(t}  
            fCount += 1 n2#Yw}7^,o  
            f = Dir$() :J{| /"==  
        Wend Mx<? c  
        ReDim Preserve in_flist(fCount-1) XA*sBf  
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    End Sub ;F:~HrxT}  
     
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