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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 Q9v OY8  
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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 Dk$[b9b  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 4,D$% .  
    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。 tE"aNA#=  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ":t'} Eg=6  
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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。 ~@8r-[  
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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) *$uj)*5,  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 Er; @nOyD  
    例如下所示: tBSHMz  
    Sample name:  EDF-C1-56 y_bb//IAG  
    Merging data from file EDF-C1-56 0-0.txt i|zs Li/  
    Finished merging RPC data for sample EDF-C1-56 |TCHPKN  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt QH:PClW![  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 -*;-T9  
    a. 创建一个新的散射库 Rlvb@aXgy  
    b. 散射模型命名 o&tETJ5Bhe  
    c. 改变散射模型为“Tabulated BSDF”. b(<#n6a}\  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) {%Mt-Gm'd  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ;9w: %c1  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 :xdl I`S  
    g. 点击OK !)1r{u  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 {pEay|L_  
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    脚本代码 cuenDw=eC  
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    '#Language "WWB-COM" KW^#DI6tr  
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    Option Explicit X%ii z  
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    Sub Main M<'AM4  
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        'Cleanup {.vU;  
        ClearOutputWindow() r`? bYoz  
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        Print "Merging RPC Photonics BSDF Data Files" d@o1< Q  
        SetTextColor(255,0,0) rGPFPsMQ]  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 1A>>#M=A  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." s d -5AE  
        SetTextColor(0,0,0) P.G`ED|K!Y  
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        'Current directory of this script (should be the same as the text files being merged) mJjd2a"vi  
        Dim cDir As String r*e<`Is  
        cDir = MacroDir$ & "\" s*A#;  
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        'Array which will be populated with the list of files to be merged Yxe%:  
        Dim fList() As String, curFile As String N@Ie VF  
        GetFileList( cDir, fList ) [ArPoJt  
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        Print "" /, G-1E  
        Print "Files found for merging:" 9~AAdD  
        For Each curFile In fList .<GU2&;!  
            Print Chr(9) & curFile &~ =q1?  
        Next ?OW!zE:  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 7#\\Ava$T  
        Dim nameArray() As String, sampName As String K x7'm1  
        nameArray = Split(fList(0)," 0-0.txt") tvh)N{j  
        sampName  = nameArray(0) ?V3kIb  
        Print "" y _Mte  
        Print "Sample name: " & Chr(9) & sampName xW`,@a }  
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        'Open an output file and write the FRED header data R?,Oh*  
        Dim outFile As String DB1F _!9  
        outFile = cDir & sampName & "_FRED.txt" Hzd tR  
        Open outFile For Output As #1 (]*otVJ  
        Print #1, "type bsdf_data" u ##.t  
        Print #1, "format angles=deg bsdf=value scale=1" %XIPPEHU  
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        'Loop the file list, skip the two header lines and write the remaining data to file ryk(Am<  
        Dim lineArray() As String, curLine As Long ~,199K#'  
        For Each curFile In fList <{ Z$!]i1  
            Print "Merging data from file " & curFile r-Nv<oH;  
            ReadFile( cDir & curFile, lineArray ) uif1)y`Q$C  
            For curLine = 2 To UBound(lineArray) =#tQhg,_  
                Print #1, lineArray(curLine) s>i`=[qFc  
            Next Uc j eB  
        Next D_n(T ')  
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        'Close the output file Us5P?}  
        Close #1 AD_aI %7  
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        Print "Finished merging RPC data for sample " & sampName fu}ZOPu  
        Print "FRED formatted data file: " & Chr(9) & outFile 4tv}5llSG  
    End Sub 0vu$dxb[  
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    'Utility function to read the contents of a file into an array of strings. 1:L _qL  
    Function ReadFile(ByVal fileName As String, _ ^#^\@jLm  
                      ByRef lineArray() As String) As Long STfcx] L  
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        ReadFile = -1 U{^~X_?  
        Dim oFSO As Object x)+3SdH  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Wmm'j&hI  
        Erase lineArray 3k5C;5  
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        Dim fid As Long y@\R$`0J  
        If oFSO.fileexists( fileName ) Then n/>^!S  
            fid = FreeFile() #&L[?jEn  
            Open fileName For Input As fid nPAVrDg O  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9_~[  
            Close fid >= G{.H  
        End If ~Ogtgr  
        Set oFSO = Nothing GI]sE]tZ  
        Return UBound( lineArray ) +lK?)77f  
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    End Function >?pWbL  
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    Sub GetFileList( ByVal in_dir As String, _ PNjZbOmzS  
                     ByRef in_flist() As String ) 8$c_M   
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        'Redimension the file list array k7R8Q~4  
        Erase in_flist dtXA EL\q  
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        'Tracks how many files are found 2;82*0Y%  
        Dim fCount As Long 'dkKBLsx  
        fCount = 0 k^x[(gw  
    "kYzgi  
        'Recurse directory and search for text files l6YToYzE2  
        Dim f As String ??4#)n k  
        f = Dir$(in_dir & "*.txt") `cz%(Ry,  
        While f <> ""  `PV+.V}  
            ReDim Preserve in_flist(fCount) 47GL[ofY  
            in_flist(fCount) = f sHt PO[h  
            fCount += 1 fmDn1N-bG  
            f = Dir$() ?Re6oLm<B  
        Wend s,tZi6Z=%E  
        ReDim Preserve in_flist(fCount-1) Z~JX@s0v  
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    End Sub r-r)'AAO  
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