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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 kDI(Y=Fg  
    1><@$kVMm~  
    RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。
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    背景 >a/]8A  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 (3a]#`Q  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 Dx`-Kg_p  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 f$#--*  
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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。 }dcXuX4{r  
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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) 7|Z=#3INw  
    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 7^1yZ1(  
    例如下所示: 4@ EY+p  
    Sample name:  EDF-C1-56 s zBlyT  
    Merging data from file EDF-C1-56 0-0.txt 6r  
    Finished merging RPC data for sample EDF-C1-56 ~nYp*t C'  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt n^vL9n_N  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 pT3p!/pl3  
    a. 创建一个新的散射库 ]^aOYtKX  
    b. 散射模型命名 #9{N[t  
    c. 改变散射模型为“Tabulated BSDF”. `;KU^dH  
    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 ) 6zv-nMZc  
    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。 Mn$w_Z?  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 jw63sn  
    g. 点击OK p5F=?*[}  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ;Q*=AW  
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    脚本代码 2XoFmV),F  
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    '#Language "WWB-COM" }E[u" @}  
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    Option Explicit wxC&KrRF  
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    Sub Main J-iFA KN  
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        'Cleanup bEO\oS  
        ClearOutputWindow() JH3$G,:zM  
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        Print "Merging RPC Photonics BSDF Data Files" ,Sz`$'^c  
        SetTextColor(255,0,0) ,q9nHZG^  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." [/Q .MmnL  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." FXLY*eRk  
        SetTextColor(0,0,0) O5rHN;\_  
    ai,\'%N  
        'Current directory of this script (should be the same as the text files being merged) #fB&Hv #s7  
        Dim cDir As String ;/-v4  
        cDir = MacroDir$ & "\" I^}q;L![\  
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        'Array which will be populated with the list of files to be merged 0)<\jo1 F  
        Dim fList() As String, curFile As String #kGgz O  
        GetFileList( cDir, fList ) 8bf_W3  
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        Print "" V$ 8go#5  
        Print "Files found for merging:" pr~%%fCh  
        For Each curFile In fList >z{*>i,m1  
            Print Chr(9) & curFile =7^rKrD  
        Next +/"Ws '5E  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ,K/l;M5I  
        Dim nameArray() As String, sampName As String K)ZW1d;  
        nameArray = Split(fList(0)," 0-0.txt") o7 :~C]  
        sampName  = nameArray(0) ]81t~t9LQ  
        Print "" V(gmC%6%l*  
        Print "Sample name: " & Chr(9) & sampName ,\){-H/n  
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        'Open an output file and write the FRED header data `(- nSQ  
        Dim outFile As String ajM3Uwnr  
        outFile = cDir & sampName & "_FRED.txt" CBkI! In2  
        Open outFile For Output As #1 vJ +sdG  
        Print #1, "type bsdf_data" %|"0p3  
        Print #1, "format angles=deg bsdf=value scale=1" iX&eQ{LB  
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        'Loop the file list, skip the two header lines and write the remaining data to file d#tqa`@~  
        Dim lineArray() As String, curLine As Long ,0hk)Vvr3  
        For Each curFile In fList >Bw<THx  
            Print "Merging data from file " & curFile %w$\v"^_Y  
            ReadFile( cDir & curFile, lineArray ) Ym% $!#  
            For curLine = 2 To UBound(lineArray) 96(3ilAt  
                Print #1, lineArray(curLine) pA%}CmrMq  
            Next TTDcVG_}  
        Next Pv#Oea?  
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        'Close the output file I ~U1vtgp  
        Close #1 R^p'gQc$   
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        Print "Finished merging RPC data for sample " & sampName #oYPe:8|m  
        Print "FRED formatted data file: " & Chr(9) & outFile 'VMov  
    End Sub c 5%uiv]  
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    'Utility function to read the contents of a file into an array of strings. N1',`L5  
    Function ReadFile(ByVal fileName As String, _ =~DQX\  
                      ByRef lineArray() As String) As Long hR4\:s+[  
    CD! Aa  
        ReadFile = -1 u?Uu>9@Z  
        Dim oFSO As Object cko^_V&x  
        Set oFSO = CreateObject("Scripting.FileSystemObject") +nIjW;RU  
        Erase lineArray = :/4)  
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        Dim fid As Long sQ}E4Iq1#S  
        If oFSO.fileexists( fileName ) Then =,Zkg(M  
            fid = FreeFile() 1u~CNHm  
            Open fileName For Input As fid mfW}^mu  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) hEh` cBO  
            Close fid 3LkcK1x.  
        End If mEZHrr J  
        Set oFSO = Nothing w-j^jU><3  
        Return UBound( lineArray ) im&Nkk4n@  
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    End Function J+(B]8aj  
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    Sub GetFileList( ByVal in_dir As String, _ f=EWr8mno  
                     ByRef in_flist() As String ) mB5Sm|{  
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        'Redimension the file list array z 0}JiWR  
        Erase in_flist Z}AhDIw!G  
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        'Tracks how many files are found KU=+ 1,Jf  
        Dim fCount As Long T!jMh-8  
        fCount = 0 !{+a2wi  
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        'Recurse directory and search for text files =T-jG_.H  
        Dim f As String r [E4/?_  
        f = Dir$(in_dir & "*.txt") 1KadT7<0}  
        While f <> "" nZX`y -AZ  
            ReDim Preserve in_flist(fCount) b{Bef*`/  
            in_flist(fCount) = f 4M )oA|1w  
            fCount += 1 xFzaVjjP  
            f = Dir$() 20 Z/Y\  
        Wend  u*m|o8  
        ReDim Preserve in_flist(fCount-1) 0aqq*e'c  
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    End Sub [y&uc  
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