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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 正序阅读 楼主  发表于: 2020-12-15
    摘要 }B1!gz$YNO  
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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 n<u $=H  
    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。 .Fp4: e  
    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。 &mx)~J^m  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 c.e2M/  
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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。 %B.yW`,X  
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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) $F5 b  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 #%h-[/  
    例如下所示: K>@+m  
    Sample name:  EDF-C1-56 Bn &Ws  
    Merging data from file EDF-C1-56 0-0.txt >: g3k  
    Finished merging RPC data for sample EDF-C1-56 s|y "WDyx5  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt |0f>aZ  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 7](KV"%V  
    a. 创建一个新的散射库 Ev}C<zk*  
    b. 散射模型命名 "L&#lfOKG  
    c. 改变散射模型为“Tabulated BSDF”. L bmawi^  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt )  ^0 \  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 j=r P:#  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 /x p|  
    g. 点击OK XLrwxj0  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 /$p6'1P8  
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    脚本代码 ,tu.2VQc@  
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    '#Language "WWB-COM" y1+*6|  
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    Option Explicit ?b>,9A.Z  
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    Sub Main hJpxf,?'K  
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        'Cleanup ud'-;W  
        ClearOutputWindow() #W.#Hjpp  
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        Print "Merging RPC Photonics BSDF Data Files" [R^i F  
        SetTextColor(255,0,0) naR0@Q"\h  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 4i(JZN?  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." SPY|K  
        SetTextColor(0,0,0) U`NjPZe5^  
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        'Current directory of this script (should be the same as the text files being merged) 9\mLW"  
        Dim cDir As String -7@/[9Gf`:  
        cDir = MacroDir$ & "\" :fZ}o|t7  
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        'Array which will be populated with the list of files to be merged >\P@^ h]  
        Dim fList() As String, curFile As String oldA#sA$  
        GetFileList( cDir, fList ) D"2&P^-  
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        Print "" 87 $dBb{  
        Print "Files found for merging:" DN-+osPi  
        For Each curFile In fList qh|_W(`y  
            Print Chr(9) & curFile %4,O 2\0?&  
        Next Q/(K$6]j  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. zck#tht4 n  
        Dim nameArray() As String, sampName As String g4=pnK8  
        nameArray = Split(fList(0)," 0-0.txt") aJbO((%$|u  
        sampName  = nameArray(0) R6kD=JY/!  
        Print "" SwTL|+u  
        Print "Sample name: " & Chr(9) & sampName QSdHm  
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        'Open an output file and write the FRED header data Mb|a+,:>3  
        Dim outFile As String $j5K8Ad  
        outFile = cDir & sampName & "_FRED.txt" .ps-4eXF  
        Open outFile For Output As #1 p'*>vk  
        Print #1, "type bsdf_data" >,$_| C  
        Print #1, "format angles=deg bsdf=value scale=1" NV72  
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        'Loop the file list, skip the two header lines and write the remaining data to file ~=6xyc/c  
        Dim lineArray() As String, curLine As Long "4+ &-ms  
        For Each curFile In fList 'MUv5 Th  
            Print "Merging data from file " & curFile hIs4@0  
            ReadFile( cDir & curFile, lineArray ) 5 ZGNz1)?V  
            For curLine = 2 To UBound(lineArray) (:TjoXXiY  
                Print #1, lineArray(curLine) ODNM+#}`  
            Next =[cS0Sy  
        Next n 22zq6m  
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        'Close the output file v &Yi  
        Close #1 .w=/+TA  
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        Print "Finished merging RPC data for sample " & sampName iNtaDX| %/  
        Print "FRED formatted data file: " & Chr(9) & outFile "d#Y}@*~o  
    End Sub A}G7l?V&  
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    'Utility function to read the contents of a file into an array of strings. DCIxRPw  
    Function ReadFile(ByVal fileName As String, _ %Gz0^[+  
                      ByRef lineArray() As String) As Long nm5cpnNl  
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        ReadFile = -1 J%v=yBC2  
        Dim oFSO As Object p{amC ;cI$  
        Set oFSO = CreateObject("Scripting.FileSystemObject") : UGZ+  
        Erase lineArray M -cTRd-i  
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        Dim fid As Long D/Z6C&/I  
        If oFSO.fileexists( fileName ) Then h)ECf?r<  
            fid = FreeFile() fi-WZ  
            Open fileName For Input As fid @r/#-?W  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) p4.wh|n  
            Close fid ]qethaNy  
        End If Vwg|K|  
        Set oFSO = Nothing "bFTk/  
        Return UBound( lineArray ) T! Y@`Ox  
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    End Function >Ea8G,  
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    Sub GetFileList( ByVal in_dir As String, _ `18qbot  
                     ByRef in_flist() As String ) 0bceI  
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        'Redimension the file list array $UMFNjL  
        Erase in_flist |%F=po>w  
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        'Tracks how many files are found ~("5y G  
        Dim fCount As Long ;(f) &Yom  
        fCount = 0 @TLS<~  
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        'Recurse directory and search for text files BWeA@v  
        Dim f As String _X^1IaL  
        f = Dir$(in_dir & "*.txt") 6Z>FTz_  
        While f <> "" @K\~O__  
            ReDim Preserve in_flist(fCount) ^W`<gR  
            in_flist(fCount) = f O,+1<.;+  
            fCount += 1 =e/9&993  
            f = Dir$() ^1S!F-H4\  
        Wend 04LI]'  
        ReDim Preserve in_flist(fCount-1) s1M Erd  
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    End Sub _(_a*ml  
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