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    [技术]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: 2023-05-11
    摘要 gaWJzK Yc_  
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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 CLgfNrW~  
    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。 2?nEHIUT  
    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。 2#Du5d  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 #c$z&J7e  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 agd^ga3  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) v2Vmcc_]9x  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 Eg(.L,dj  
    例如下所示: VQ8Q=!]  
    Sample name:  EDF-C1-56 +?v2MsF']  
    Merging data from file EDF-C1-56 0-0.txt 9@>Q7AUCQ  
    Finished merging RPC data for sample EDF-C1-56 ,}/6Za  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt *~kHH  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ?$.JgG%Z+g  
    a. 创建一个新的散射库 c0Yc~&RF  
    b. 散射模型命名 |3G;Rh9w,  
    c. 改变散射模型为“Tabulated BSDF”. p:zRgwcn  
    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 ) &AnWMFo  
    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。 r2m&z%N &  
    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= (vS  
    g. 点击OK +-NH 4vUg  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 uxlrJ1~M  
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    脚本代码 dWP<,Z>  
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    '#Language "WWB-COM" zy`T! $  
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    Option Explicit ;)q"X>FMZe  
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    Sub Main 4{ [d '-H5  
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        'Cleanup 9qvl9,*g  
        ClearOutputWindow() ;KgDVq5  
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        Print "Merging RPC Photonics BSDF Data Files" 0ax ;Q[z2  
        SetTextColor(255,0,0) JnLF61   
        Print "Note: Script should be located in the same folder as the BSDF TXT files." |t~*!0>3  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 06e dVIRr  
        SetTextColor(0,0,0) 0 YAH[YF  
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        'Current directory of this script (should be the same as the text files being merged) [lGxys)J  
        Dim cDir As String a U*}.{<!  
        cDir = MacroDir$ & "\" #, h0K  
    9.BgsV .  
        'Array which will be populated with the list of files to be merged kK:U+`+  
        Dim fList() As String, curFile As String JCci*F#r  
        GetFileList( cDir, fList ) 5?m4B:W  
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        Print "" ~ R eX$9  
        Print "Files found for merging:" O l;DJV  
        For Each curFile In fList  uU=!e&3  
            Print Chr(9) & curFile S6Y:Z0  
        Next 2I283%xr  
    =#vJqA  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. e*Y<m\*  
        Dim nameArray() As String, sampName As String 0U8'dYf  
        nameArray = Split(fList(0)," 0-0.txt") / ;+Mz*  
        sampName  = nameArray(0) Z!3R  
        Print "" &Q*  7  
        Print "Sample name: " & Chr(9) & sampName qkqtPbQ 7  
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        'Open an output file and write the FRED header data ]Y@_2`  
        Dim outFile As String b,X+*hRt  
        outFile = cDir & sampName & "_FRED.txt" }<zbx*!  
        Open outFile For Output As #1 Tn9F g7<  
        Print #1, "type bsdf_data" Bg}l$?S  
        Print #1, "format angles=deg bsdf=value scale=1" 33&l.[A"!}  
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        'Loop the file list, skip the two header lines and write the remaining data to file Ze <)B *  
        Dim lineArray() As String, curLine As Long  : 76zRF  
        For Each curFile In fList =~5N/!  
            Print "Merging data from file " & curFile hM[3l1o{|  
            ReadFile( cDir & curFile, lineArray ) jib pZ)  
            For curLine = 2 To UBound(lineArray) w O Ou/Y  
                Print #1, lineArray(curLine) E#,\[<pc  
            Next 4sW'pH  
        Next UA(4mbz+  
    Z}{]/=h  
        'Close the output file efE=5%O  
        Close #1 }=Xlac_U  
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        Print "Finished merging RPC data for sample " & sampName OZC yg/K  
        Print "FRED formatted data file: " & Chr(9) & outFile I0qJr2[X~  
    End Sub q|0l>DPRp  
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    'Utility function to read the contents of a file into an array of strings. ^qi+Y)dU|  
    Function ReadFile(ByVal fileName As String, _ 62MQ+H  
                      ByRef lineArray() As String) As Long }Q@~_3,UJ  
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        ReadFile = -1 +25=u|#4r  
        Dim oFSO As Object R.DUfU"gp  
        Set oFSO = CreateObject("Scripting.FileSystemObject") >; tE.CJH  
        Erase lineArray OCq5}%yU&i  
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        Dim fid As Long G:y+yE4  
        If oFSO.fileexists( fileName ) Then '$eJATtC  
            fid = FreeFile() 29CzG0?B  
            Open fileName For Input As fid 0Lb{HLT  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) c{ +bY .J  
            Close fid 7WUv  O  
        End If ALcPbr  
        Set oFSO = Nothing 42p1P6d  
        Return UBound( lineArray ) UvM4-M%2JN  
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    End Function xRdx` YYu  
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    Sub GetFileList( ByVal in_dir As String, _ y/kB`Z(Yj  
                     ByRef in_flist() As String ) N UJ $)qNA  
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        'Redimension the file list array }/h&`0z `  
        Erase in_flist :Ocw+X3  
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        'Tracks how many files are found ^\kH^   
        Dim fCount As Long M] +.xo+A  
        fCount = 0 ez.a  
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        'Recurse directory and search for text files mQR9Pn}H  
        Dim f As String Jp%5qBS^  
        f = Dir$(in_dir & "*.txt") z1 MT@G)S$  
        While f <> "" + d3  
            ReDim Preserve in_flist(fCount) &:IcwD&  
            in_flist(fCount) = f gujP{Z  
            fCount += 1 .Gvk5Wn  
            f = Dir$() mF|KjX~s  
        Wend :=TIq  
        ReDim Preserve in_flist(fCount-1) U8y?S]}vo  
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    End Sub A<"< DDy  
     
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