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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 xN*k&!1&  
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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 Pm%xX~H  
    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。 3t<a3"{9  
    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。 #e@NV4q  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Ue \A ,  
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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。 dU3A:uS^  
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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) :!_l@=l  
    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 Md4Q.8  
    例如下所示: lo!pslqsn  
    Sample name:  EDF-C1-56 zg ,=A?  
    Merging data from file EDF-C1-56 0-0.txt *IOrv)  
    Finished merging RPC data for sample EDF-C1-56 MiZ<v/L2  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ?1L<VL=b  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ^mL X}E]  
    a. 创建一个新的散射库 7G+!9^  
    b. 散射模型命名 8=$XhC  
    c. 改变散射模型为“Tabulated BSDF”. \0 ~?i6o  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ZP~H!  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 HN7tIz@Frc  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 QqQhQGV  
    g. 点击OK no8\Oees  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 oJD]h/fQs  
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    脚本代码 OH06{I>;  
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    '#Language "WWB-COM" w4P;Z-Cd  
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    Option Explicit ^B1Ft5F`b  
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    Sub Main c1E{J <pZ  
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        'Cleanup S"*k#ao  
        ClearOutputWindow() nl}LT/N  
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        Print "Merging RPC Photonics BSDF Data Files" Pd+*syOM  
        SetTextColor(255,0,0) SZTn=\  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 0UJ6> Rj  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." VHPqEaR  
        SetTextColor(0,0,0) SZXSVz0j  
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        'Current directory of this script (should be the same as the text files being merged) b_`h2dUq  
        Dim cDir As String K&&T:'=/  
        cDir = MacroDir$ & "\" v)np.j0V7  
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        'Array which will be populated with the list of files to be merged ]*P9=!x|M  
        Dim fList() As String, curFile As String Pl=)eq YY  
        GetFileList( cDir, fList ) hdWVvN  
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        Print "" &Z>??|f  
        Print "Files found for merging:" +EjXoW7V  
        For Each curFile In fList CKH mJ]=  
            Print Chr(9) & curFile OK v2..8  
        Next f/c&Ya(D~  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Ej)7[  
        Dim nameArray() As String, sampName As String 3\4e{3$  
        nameArray = Split(fList(0)," 0-0.txt") cz,CL/rno  
        sampName  = nameArray(0) ZxSnqbyA*  
        Print "" 4 .c1  
        Print "Sample name: " & Chr(9) & sampName }'tJc $!  
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        'Open an output file and write the FRED header data SrH::-{  
        Dim outFile As String h!uyTgq  
        outFile = cDir & sampName & "_FRED.txt" 2FaCrc/  
        Open outFile For Output As #1 x-c5iahp'  
        Print #1, "type bsdf_data" Q>Klkd5(  
        Print #1, "format angles=deg bsdf=value scale=1" ;6 W[%{  
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        'Loop the file list, skip the two header lines and write the remaining data to file YvN]7tcb  
        Dim lineArray() As String, curLine As Long m-$}'mEO  
        For Each curFile In fList %\-E R !b  
            Print "Merging data from file " & curFile 1K#[Ef4  
            ReadFile( cDir & curFile, lineArray ) FRR05%K  
            For curLine = 2 To UBound(lineArray) 5.ab/uk;M  
                Print #1, lineArray(curLine) 1#c Tk  
            Next ;_SSR8uHv  
        Next baD063P;  
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        'Close the output file L7{}`O/g7  
        Close #1 ~tWh6-:|{J  
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        Print "Finished merging RPC data for sample " & sampName )V~=B]  
        Print "FRED formatted data file: " & Chr(9) & outFile OQfFS+6  
    End Sub "`cN k26JZ  
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    'Utility function to read the contents of a file into an array of strings. -a@e28Y  
    Function ReadFile(ByVal fileName As String, _ {H(l"KuL  
                      ByRef lineArray() As String) As Long fQC{Lc S  
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        ReadFile = -1 OnE%D|Tq=  
        Dim oFSO As Object a(6h`GHo  
        Set oFSO = CreateObject("Scripting.FileSystemObject") q/zU'7%@  
        Erase lineArray >U`G3(#7S  
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        Dim fid As Long w!H(zjv&(  
        If oFSO.fileexists( fileName ) Then ?e6>dNw  
            fid = FreeFile() XQn1B3k+  
            Open fileName For Input As fid e(/F:ZEh  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) p%meuWV%5  
            Close fid &kzysv-_  
        End If 2#:p:R8I>  
        Set oFSO = Nothing U!-Nx9  
        Return UBound( lineArray ) ]w>o=<?b  
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    End Function ^wWbW&<Tg  
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    Sub GetFileList( ByVal in_dir As String, _ jr0j0$BF  
                     ByRef in_flist() As String ) 11"r FZ  
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        'Redimension the file list array JqMF9|{H  
        Erase in_flist .e0)@}Jv8>  
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        'Tracks how many files are found 5\z<xpJ  
        Dim fCount As Long uU3A,-{-  
        fCount = 0 G`n $A/9Q  
    -!_8>r;Q4  
        'Recurse directory and search for text files =3(Auchl$Y  
        Dim f As String `K5*Fjx  
        f = Dir$(in_dir & "*.txt") T 'c39  
        While f <> "" wjl)yo$z  
            ReDim Preserve in_flist(fCount) f0SrPc v  
            in_flist(fCount) = f 3E*m.jX  
            fCount += 1 :Q"|%#P  
            f = Dir$() Gu~*ZKyJ  
        Wend l~;>KjZg  
        ReDim Preserve in_flist(fCount-1) i:aW .QZ.  
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    End Sub  iiQn/%  
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