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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 W2yNEiH  
    @o44b!i  
    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 +sE81B  
    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。 I\Y/*u  
    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。 %6L!JN  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 6H VS0  
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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。 0d`s(b54;O  
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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) )`-9WCd&  
    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 TxN#3m?G  
    例如下所示: _9#4  
    Sample name:  EDF-C1-56 \[]36|$LS  
    Merging data from file EDF-C1-56 0-0.txt +%?_1bGX>  
    Finished merging RPC data for sample EDF-C1-56 (IIOKx_  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 8cfxKUS  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 twNZ^=SGr  
    a. 创建一个新的散射库 F{]dq/{  
    b. 散射模型命名 qK.8^{b  
    c. 改变散射模型为“Tabulated BSDF”. b&HA_G4  
    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 ) RQ9fA1YP  
    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。 .9lx@6]+  
    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 *1ku2e]z  
    g. 点击OK s7(mNpo  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Ct|iZLh`j  
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    脚本代码 $khWu>b  
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    '#Language "WWB-COM" tP"C >#LO  
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    Option Explicit _?Rprmjx}  
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    Sub Main &P&M6v+  
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        'Cleanup \P^WUWY  
        ClearOutputWindow() &}OaiTzEmc  
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        Print "Merging RPC Photonics BSDF Data Files" A=I]1r  
        SetTextColor(255,0,0) C6M|A3^T  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." "n}J6   
        Print "Note: Do not run this script multiple times without deleting the output file between executions." *6df|q  
        SetTextColor(0,0,0) }NMA($@A  
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        'Current directory of this script (should be the same as the text files being merged) d2Z5HFtY  
        Dim cDir As String Uk` ym  
        cDir = MacroDir$ & "\" )%-FnW  
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        'Array which will be populated with the list of files to be merged Cf91#% :cN  
        Dim fList() As String, curFile As String FF0N{bY  
        GetFileList( cDir, fList ) "4<RMYQ  
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        Print "" %nSm 32/t3  
        Print "Files found for merging:" FDbb/6ku  
        For Each curFile In fList Nv,1F  
            Print Chr(9) & curFile a:r8Jzr  
        Next ?T3zA2  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. JF!JY( U,  
        Dim nameArray() As String, sampName As String tSaLR90Y6  
        nameArray = Split(fList(0)," 0-0.txt") Iojyku\W.  
        sampName  = nameArray(0) x{6KsYEY  
        Print "" q_bE?j{  
        Print "Sample name: " & Chr(9) & sampName eee77.@y-p  
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        'Open an output file and write the FRED header data 9utiev~3  
        Dim outFile As String Y,w'Op  
        outFile = cDir & sampName & "_FRED.txt" PIR#M('  
        Open outFile For Output As #1  s6bILz-u  
        Print #1, "type bsdf_data" 0{^@kxV  
        Print #1, "format angles=deg bsdf=value scale=1" Yz(k4K L  
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        'Loop the file list, skip the two header lines and write the remaining data to file *oopdGue  
        Dim lineArray() As String, curLine As Long _1Iy/T@1  
        For Each curFile In fList Dk8 O*B   
            Print "Merging data from file " & curFile d` %8qLIW  
            ReadFile( cDir & curFile, lineArray ) =r"-Pm{  
            For curLine = 2 To UBound(lineArray) R[KF${X4  
                Print #1, lineArray(curLine) 5pSo`)  
            Next 2;Vss<hR4A  
        Next .1n=&d|  
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        'Close the output file ~puXZCatN  
        Close #1 I><B6pIR  
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        Print "Finished merging RPC data for sample " & sampName e_RLKFv7  
        Print "FRED formatted data file: " & Chr(9) & outFile nhV\<  
    End Sub 4'3do>!  
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    'Utility function to read the contents of a file into an array of strings. O[}{$NXw  
    Function ReadFile(ByVal fileName As String, _ kN7 J Z12  
                      ByRef lineArray() As String) As Long #1Zqq([@  
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        ReadFile = -1 g)?Ol  
        Dim oFSO As Object yS#)F.  
        Set oFSO = CreateObject("Scripting.FileSystemObject") TF]bmM})0  
        Erase lineArray f3yH4r?;w  
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        Dim fid As Long x,wXR=H  
        If oFSO.fileexists( fileName ) Then D;nd_{%  
            fid = FreeFile() k1lo{jw`  
            Open fileName For Input As fid EdL2t``  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Lql2ry$Wa  
            Close fid [8C|v61Y  
        End If _+!@c6k)ra  
        Set oFSO = Nothing Q};n%&n&  
        Return UBound( lineArray ) 6a*?m{  
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    End Function P"(VRc6x  
    }Q2v~eD  
    Sub GetFileList( ByVal in_dir As String, _ jJY{np  
                     ByRef in_flist() As String ) Bd'X~Vj<  
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        'Redimension the file list array p< Y-b,&  
        Erase in_flist ( ]E0fjk  
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        'Tracks how many files are found a8WWFAC[  
        Dim fCount As Long m?< ^b_a}  
        fCount = 0 vjL +fH<0:  
    u^O!5 'D%  
        'Recurse directory and search for text files Ucx"\/"  
        Dim f As String #<LJns\t   
        f = Dir$(in_dir & "*.txt") $7QGi|W*k  
        While f <> "" KqN;a i,F  
            ReDim Preserve in_flist(fCount) L6?~<#-m\M  
            in_flist(fCount) = f "ejsz&n  
            fCount += 1 O#<F"e;$  
            f = Dir$() J9*i`8kU.  
        Wend KE4#vKV0yC  
        ReDim Preserve in_flist(fCount-1) GlHP`&;UH  
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    End Sub Pn,>eD*g  
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