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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 vl<J-+|0C  
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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 ,J|};s+  
    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。 89paR[  
    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。 =BtEduz  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 >HFJm&lQ  
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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。 TDoYp  
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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) `G'V9Xs(  
    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 Bg`b*(Q  
    例如下所示: ;Gi w7a)  
    Sample name:  EDF-C1-56 ^{s)`j'I*  
    Merging data from file EDF-C1-56 0-0.txt ^Z*_@A_v  
    Finished merging RPC data for sample EDF-C1-56 B$bsh.  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt v% 1#y5  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 7-5q\[ZK  
    a. 创建一个新的散射库 `# R$  
    b. 散射模型命名 g5 E]o)  
    c. 改变散射模型为“Tabulated BSDF”. p})&Zl)V  
    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 ) $\bH 5|Hk]  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 oI>;O#  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 4=9F1[  
    g. 点击OK I$Z"o9"  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 bfJDF(=h  
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    脚本代码 O7.Is88!  
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    '#Language "WWB-COM" #U1soZ7  
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    Option Explicit {?C7BClB  
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    Sub Main %$cwbh-{{  
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        'Cleanup  u(BYRB  
        ClearOutputWindow() r[gV`khka  
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        Print "Merging RPC Photonics BSDF Data Files" 8ZN J}  
        SetTextColor(255,0,0) a%AU9?/q#  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." iz'8P-]K>  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 4QDW}5xB  
        SetTextColor(0,0,0) H`y- "L8q  
    #C+0m`  
        'Current directory of this script (should be the same as the text files being merged) lj[Bd >  
        Dim cDir As String D\k);BU~  
        cDir = MacroDir$ & "\" T|E;U  
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        'Array which will be populated with the list of files to be merged UpgOU.  
        Dim fList() As String, curFile As String :g,rl\S7  
        GetFileList( cDir, fList ) \F> *d!^C  
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        Print "" KAe) X_R7  
        Print "Files found for merging:" i{`>!)U  
        For Each curFile In fList OxD\e5r  
            Print Chr(9) & curFile mU3UQ j  
        Next |BXq8Erh  
    # mzJ^V-  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. nBNZ@nD  
        Dim nameArray() As String, sampName As String 97 1qr  
        nameArray = Split(fList(0)," 0-0.txt") 9`b*Y*d  
        sampName  = nameArray(0) We" "/X  
        Print "" BFMM6-Ve  
        Print "Sample name: " & Chr(9) & sampName -Wmpj  
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        'Open an output file and write the FRED header data Me8d o; G|  
        Dim outFile As String (Q @m;i>  
        outFile = cDir & sampName & "_FRED.txt" Pd3t~1TaW  
        Open outFile For Output As #1 Qc3 !FW<26  
        Print #1, "type bsdf_data" 9)=as/o  
        Print #1, "format angles=deg bsdf=value scale=1" `dj/Uk  
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        'Loop the file list, skip the two header lines and write the remaining data to file xUG|@xIwc  
        Dim lineArray() As String, curLine As Long :!3P4?a  
        For Each curFile In fList vbSz&+52;  
            Print "Merging data from file " & curFile 6!bf,T]  
            ReadFile( cDir & curFile, lineArray ) Vbwbc5m}  
            For curLine = 2 To UBound(lineArray) HHX9QebiST  
                Print #1, lineArray(curLine) wi9fYfuv3R  
            Next k_!z=6?[:  
        Next YKk%lZ.8  
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        'Close the output file [%b<%m}L-  
        Close #1 9 /9,[A  
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        Print "Finished merging RPC data for sample " & sampName !x,3k\M  
        Print "FRED formatted data file: " & Chr(9) & outFile #|'8O  
    End Sub 4ba1c  
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    'Utility function to read the contents of a file into an array of strings. $CXqkK<6  
    Function ReadFile(ByVal fileName As String, _ |o+vpy  
                      ByRef lineArray() As String) As Long 5uu{f&?u)  
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        ReadFile = -1 ZI5UQH/  
        Dim oFSO As Object !Dz:6r  
        Set oFSO = CreateObject("Scripting.FileSystemObject") w| >Y&/IX  
        Erase lineArray ^goS? p/z  
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        Dim fid As Long H-I*;  
        If oFSO.fileexists( fileName ) Then IQH;`+  
            fid = FreeFile() ma-|L3 #  
            Open fileName For Input As fid f(9w FT  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) FL`. (,  
            Close fid z muq4-.  
        End If hzPpw.  
        Set oFSO = Nothing 2!jbaSH(+  
        Return UBound( lineArray ) C@KYg/nYw  
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    End Function ^%\p; yhL  
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    Sub GetFileList( ByVal in_dir As String, _ ~L?p/3m   
                     ByRef in_flist() As String ) L*FnFRhU  
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        'Redimension the file list array \Ud2]^D=  
        Erase in_flist y_J{+  
    Jq.26I=  
        'Tracks how many files are found S:DB%V3  
        Dim fCount As Long dAga(<K  
        fCount = 0 N["(ZSS   
    q/]tJ{FI  
        'Recurse directory and search for text files m@jOIt!<  
        Dim f As String y*zZ }>  
        f = Dir$(in_dir & "*.txt") b5yb~;0  
        While f <> "" ,E/vHI8  
            ReDim Preserve in_flist(fCount) 71wyZJ  
            in_flist(fCount) = f 9WBDSx_(Q  
            fCount += 1 `5x,N%9{  
            f = Dir$() dLjT^ 9  
        Wend !WDdq_n*v  
        ReDim Preserve in_flist(fCount-1) c5Offnq'1  
    '"I"D9;9  
    End Sub ,kLeK{   
     
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