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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    离线infotek
     
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    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 ]i*](UQ  
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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 m~hoE8C$  
    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。 >q~l21dUi  
    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。 M$Zo.Bl$(  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 WQNE2Q  
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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。 Gfp1mev   
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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) WY:&ugGx  
    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 u{N,Ib 8  
    例如下所示: I zbU)ud  
    Sample name:  EDF-C1-56 gb=/#G0R  
    Merging data from file EDF-C1-56 0-0.txt `(6r3f~XJ  
    Finished merging RPC data for sample EDF-C1-56 `1OgYs  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 4_v]O  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 xM[Vc  
    a. 创建一个新的散射库 iJ' xh n  
    b. 散射模型命名 so$(_W3E,  
    c. 改变散射模型为“Tabulated BSDF”. dC\ZjZZ  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) :'F}Dy  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 0$+fkDf  
    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 A\_|un%  
    g. 点击OK vDl- "!G1  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 oh"O07  
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    脚本代码 Z+j\a5d?,  
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    '#Language "WWB-COM" %CUGm$nH  
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    Option Explicit Ghl'nqPlm  
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    Sub Main pD]0`L-HJU  
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        'Cleanup HHX-1+L  
        ClearOutputWindow() Y)N-V ]5L  
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        Print "Merging RPC Photonics BSDF Data Files" r78TE@d  
        SetTextColor(255,0,0) ]?x: Qm'yo  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." cLPkK3O\=  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." t5)+&I2  
        SetTextColor(0,0,0) oI)GKA_Ng7  
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        'Current directory of this script (should be the same as the text files being merged) ,QzL)W7  
        Dim cDir As String 3d<HN6&U  
        cDir = MacroDir$ & "\" SS`qJZ|w  
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        'Array which will be populated with the list of files to be merged / XnhmqWm%  
        Dim fList() As String, curFile As String jM-)BP6f4  
        GetFileList( cDir, fList ) !RyO\>:q  
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        Print "" WDFjp  
        Print "Files found for merging:" [=B$5%A  
        For Each curFile In fList [,2|Flf e  
            Print Chr(9) & curFile it]E-^2>  
        Next fDG0BNLY  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. xss`Y,5?  
        Dim nameArray() As String, sampName As String ^rvx!?zO  
        nameArray = Split(fList(0)," 0-0.txt") ,g%&|FAP  
        sampName  = nameArray(0) /Uo y/}!  
        Print "" zC _<(4$-"  
        Print "Sample name: " & Chr(9) & sampName }y9mNT  
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        'Open an output file and write the FRED header data h?bb/T+'  
        Dim outFile As String 6c^e\0q  
        outFile = cDir & sampName & "_FRED.txt" ~"UV]Udn  
        Open outFile For Output As #1 &WNf M+  
        Print #1, "type bsdf_data" %Y!Yvw^&P(  
        Print #1, "format angles=deg bsdf=value scale=1" Or !+._3i  
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        'Loop the file list, skip the two header lines and write the remaining data to file )(y) A[  
        Dim lineArray() As String, curLine As Long +cD!1IT:  
        For Each curFile In fList F(t=!k,4\  
            Print "Merging data from file " & curFile <dW]\h?)  
            ReadFile( cDir & curFile, lineArray ) rvr-XGK36\  
            For curLine = 2 To UBound(lineArray) (@iMLuewK  
                Print #1, lineArray(curLine) Oft4- 4$E  
            Next n_3O-X(  
        Next 1"pw  
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        'Close the output file 35tu>^_#V  
        Close #1 gY@N~'f;"  
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        Print "Finished merging RPC data for sample " & sampName 6xD#?  
        Print "FRED formatted data file: " & Chr(9) & outFile }:Z#}8  
    End Sub /z BxJT0  
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    'Utility function to read the contents of a file into an array of strings. Ug&,Y/tFw2  
    Function ReadFile(ByVal fileName As String, _ 61xs%kxb..  
                      ByRef lineArray() As String) As Long bQ~j=\[r  
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        ReadFile = -1 (PfqRk1Y  
        Dim oFSO As Object 0{#8',*}m?  
        Set oFSO = CreateObject("Scripting.FileSystemObject") J/}:x;Y  
        Erase lineArray ,_"AT! r  
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        Dim fid As Long ?s:d[To6  
        If oFSO.fileexists( fileName ) Then PssMTEf  
            fid = FreeFile() bT&: fHc  
            Open fileName For Input As fid gks{\H]  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) /% kY0 LY  
            Close fid ;\p KDPr  
        End If `F/Tv 5@L  
        Set oFSO = Nothing }[M`uZ  
        Return UBound( lineArray ) 8=]Tr3   
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    End Function U^Xm)lL  
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    Sub GetFileList( ByVal in_dir As String, _ 9;veuX#(  
                     ByRef in_flist() As String ) P3oI2\)*i  
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        'Redimension the file list array &LbJT$}V  
        Erase in_flist g&`pgmUX  
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        'Tracks how many files are found Sv  &[f}S  
        Dim fCount As Long F4K0) ;  
        fCount = 0 9~l hsH  
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        'Recurse directory and search for text files |O"lNUW   
        Dim f As String {#{DH?=^)u  
        f = Dir$(in_dir & "*.txt") -=(!g&0  
        While f <> "" _r2J7&  
            ReDim Preserve in_flist(fCount) %*\es7m}  
            in_flist(fCount) = f DG?"5:Zd  
            fCount += 1 P LueVz  
            f = Dir$() g H G  
        Wend {uHU]6d3qy  
        ReDim Preserve in_flist(fCount-1) 0=K9`=5d0  
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    End Sub Mb]rY>B4  
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