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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 ')k n  
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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 Z5lE*z  
    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。 ZJCD)?]=3  
    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。 pIKQx5;  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 L*TPLS[lh  
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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。 Q{hXP*5  
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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) pBW|d\8  
    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 y:6&P6`dx  
    例如下所示: [ D[&aA  
    Sample name:  EDF-C1-56 }co v"o  
    Merging data from file EDF-C1-56 0-0.txt *>x~`  
    Finished merging RPC data for sample EDF-C1-56 [yzDa:%  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt GfEg][f  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ';g]!XsY)  
    a. 创建一个新的散射库 V2< 4~J2:9  
    b. 散射模型命名 mez )G|  
    c. 改变散射模型为“Tabulated BSDF”. (DzV3/+p^  
    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 ) Tk[`kmb  
    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。 s bf\;_!  
    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 de.!~%D  
    g. 点击OK cVrses^yE  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ]s3U+t?  
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    脚本代码 .8[Db1W  
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    '#Language "WWB-COM" NXQdyg,  
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    Option Explicit 'g<0MOq{  
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    Sub Main B^W0Ik`m  
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        'Cleanup 7x *]  
        ClearOutputWindow() IuJj ;L1  
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        Print "Merging RPC Photonics BSDF Data Files" `(j}2X'[  
        SetTextColor(255,0,0) Ra\>^W6z  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." KMsm2~P  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." /UG H7srx  
        SetTextColor(0,0,0) 6qsT/  
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        'Current directory of this script (should be the same as the text files being merged) [C@0&[[  
        Dim cDir As String H-gq0+,yE  
        cDir = MacroDir$ & "\" E 9=a+l9  
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        'Array which will be populated with the list of files to be merged &%QtUPvr9  
        Dim fList() As String, curFile As String $0[T=9q <+  
        GetFileList( cDir, fList ) 7r=BGoA2E  
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        Print "" L_Q1:nL-0  
        Print "Files found for merging:" ^P&)2m:s  
        For Each curFile In fList YN Lc )  
            Print Chr(9) & curFile 3c<). aC0f  
        Next KsZXdM/  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. R8 1z|+c|_  
        Dim nameArray() As String, sampName As String b[<Q_7~2  
        nameArray = Split(fList(0)," 0-0.txt") 8+ 5-7)  
        sampName  = nameArray(0) Ip}(!D|  
        Print "" P$MAURFm  
        Print "Sample name: " & Chr(9) & sampName `>^2MHF3LT  
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        'Open an output file and write the FRED header data ^:Vwblv(  
        Dim outFile As String ve.rp F\  
        outFile = cDir & sampName & "_FRED.txt" w{$t:l)2,  
        Open outFile For Output As #1 x%kS:!  
        Print #1, "type bsdf_data" tA?P$5?-*  
        Print #1, "format angles=deg bsdf=value scale=1" Rn={:u4  
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        'Loop the file list, skip the two header lines and write the remaining data to file 9;3f`DK@2k  
        Dim lineArray() As String, curLine As Long #8.%YG  
        For Each curFile In fList /`yb75  
            Print "Merging data from file " & curFile %;0Llxf"  
            ReadFile( cDir & curFile, lineArray ) _aOisN{  
            For curLine = 2 To UBound(lineArray) RFyeA. N  
                Print #1, lineArray(curLine) 9N^&~O|1  
            Next ^Xjh?+WM  
        Next Y$8 >fv  
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        'Close the output file d, j"8\@  
        Close #1 Z IfhC'  
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        Print "Finished merging RPC data for sample " & sampName \N1 G5W  
        Print "FRED formatted data file: " & Chr(9) & outFile 6yZfV7I  
    End Sub lUXxpv1m  
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    'Utility function to read the contents of a file into an array of strings. l_JPkM(mJw  
    Function ReadFile(ByVal fileName As String, _ ZgCG'SU  
                      ByRef lineArray() As String) As Long @;m7u  
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        ReadFile = -1 (7w`BR9B  
        Dim oFSO As Object @$ E&H`da  
        Set oFSO = CreateObject("Scripting.FileSystemObject") <_&H<]t%rI  
        Erase lineArray  ajF-T=5  
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        Dim fid As Long F0 WM&{v  
        If oFSO.fileexists( fileName ) Then )+2GF0%  
            fid = FreeFile() $5aRu,  
            Open fileName For Input As fid DZGM4|@<7Y  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) )24r^21.q  
            Close fid =s"_! 7  
        End If H3T4v1o6  
        Set oFSO = Nothing ^]}UyrOn  
        Return UBound( lineArray ) "`Q~rjc$2  
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    End Function !gv/jdF  
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    Sub GetFileList( ByVal in_dir As String, _ Gz;.?=&iF  
                     ByRef in_flist() As String ) <^+~? KDZM  
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        'Redimension the file list array } y@pAeS,  
        Erase in_flist ]c,ttS _  
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        'Tracks how many files are found C*kGB(H7  
        Dim fCount As Long uNe5Mv|}  
        fCount = 0 Rk8>Ak(/  
    26|2r  
        'Recurse directory and search for text files Wi_5.=  
        Dim f As String w=>~pYASH  
        f = Dir$(in_dir & "*.txt") v5U\E`)s  
        While f <> "" Ld>y Fb(`  
            ReDim Preserve in_flist(fCount) :lQl;Q -e  
            in_flist(fCount) = f .-t#wXEi  
            fCount += 1 iK{ a9pt  
            f = Dir$() a]^hcKo4  
        Wend C=L_@{^Rgb  
        ReDim Preserve in_flist(fCount-1) p$^}g:  
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    End Sub <H3njv  
     
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