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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: 07-22
    摘要  [7bY(  
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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 I ?1E}bv  
    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。 gVGq  
    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。 #\}hN~@F  
    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&UD j  
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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。 ! M bRI  
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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) 9DIGK\  
    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 r )T`?y  
    例如下所示: 3yTBkFI!  
    Sample name:  EDF-C1-56 j1BYSfX'  
    Merging data from file EDF-C1-56 0-0.txt zmdOL9"a  
    Finished merging RPC data for sample EDF-C1-56 ?f%@8%px  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt <a'j8pw9i  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 cJt#8P  
    a. 创建一个新的散射库 ag3T[}L z  
    b. 散射模型命名 X3nwA#If1  
    c. 改变散射模型为“Tabulated BSDF”. -/h$Yb  
    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 ) DU;]Q:r{  
    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。 $lO\eQGxB  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 Y$(G)Fs  
    g. 点击OK Va1|XQ<CL  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "MyYu}AD  
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    脚本代码 j*CnnM#n  
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    '#Language "WWB-COM" 6ds&n#n  
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    Option Explicit .9`.\v6R  
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    Sub Main 7Q^t(  
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        'Cleanup EB)0 iQ  
        ClearOutputWindow() f5'+F-`N  
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        Print "Merging RPC Photonics BSDF Data Files" tf>?;  
        SetTextColor(255,0,0) aa$+(  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ]Fa VKC~3  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 9D&ocV3QV  
        SetTextColor(0,0,0) |`,%%p|T%  
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        'Current directory of this script (should be the same as the text files being merged) k+_pj k  
        Dim cDir As String T;I a;<mfE  
        cDir = MacroDir$ & "\" q'PA2a:  
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        'Array which will be populated with the list of files to be merged O%rjY  
        Dim fList() As String, curFile As String X.g1 312~  
        GetFileList( cDir, fList ) 4O2O0\o:  
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        Print "" ZU/6#pb  
        Print "Files found for merging:" YrA#NTB_o  
        For Each curFile In fList y+@7k3"  
            Print Chr(9) & curFile iQ:]1H s  
        Next =EFF2M`F  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 'r3I/qg*m  
        Dim nameArray() As String, sampName As String o ;.j_  
        nameArray = Split(fList(0)," 0-0.txt") gR%fv  
        sampName  = nameArray(0) )~rN{W<s`H  
        Print "" k|1/gd5  
        Print "Sample name: " & Chr(9) & sampName mL ]zkD_  
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        'Open an output file and write the FRED header data 9=Y-w s  
        Dim outFile As String }VdohX-  
        outFile = cDir & sampName & "_FRED.txt" tZwZZ0]Z  
        Open outFile For Output As #1 `5Q0U%`W  
        Print #1, "type bsdf_data" vTN$SgzfCU  
        Print #1, "format angles=deg bsdf=value scale=1" UZv^3_,qz  
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        'Loop the file list, skip the two header lines and write the remaining data to file ,{7Z OzA  
        Dim lineArray() As String, curLine As Long v-EcJj%  
        For Each curFile In fList Ee d2`~  
            Print "Merging data from file " & curFile JuS#p5E #  
            ReadFile( cDir & curFile, lineArray ) c V=h 8F  
            For curLine = 2 To UBound(lineArray) E\5t&jZr  
                Print #1, lineArray(curLine) d_]zX;_  
            Next *e!0ZB3J  
        Next 2{% U\^-  
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        'Close the output file *ax$R6a#X  
        Close #1 hr(E, TAe  
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        Print "Finished merging RPC data for sample " & sampName GeD^-.^  
        Print "FRED formatted data file: " & Chr(9) & outFile 8:TN,p  
    End Sub V`m'r+ Y  
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    'Utility function to read the contents of a file into an array of strings. <x *.M"6?  
    Function ReadFile(ByVal fileName As String, _ UW_fn  
                      ByRef lineArray() As String) As Long ZG"_M@S.  
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        ReadFile = -1 n3 -5`Jti  
        Dim oFSO As Object M<4~ewWJ  
        Set oFSO = CreateObject("Scripting.FileSystemObject") y}Oc^Fc  
        Erase lineArray ?I6!m~  
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        Dim fid As Long .Ce30VE-  
        If oFSO.fileexists( fileName ) Then CI{? Kb  
            fid = FreeFile() #41~`vq3  
            Open fileName For Input As fid S=@.<gS  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 8m\* ~IX=  
            Close fid Y92 w L}  
        End If Mj|\LF +  
        Set oFSO = Nothing "AMbU6 8  
        Return UBound( lineArray ) pX `BDYg.  
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    End Function $F"'= +0  
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    Sub GetFileList( ByVal in_dir As String, _ SfLZVB  
                     ByRef in_flist() As String ) T{<riJ`O  
    :c)N"EJlI2  
        'Redimension the file list array XEl-5-M"  
        Erase in_flist 3|x*lmit  
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        'Tracks how many files are found xkV(E!O  
        Dim fCount As Long lA>^k;+>  
        fCount = 0 p8,Rr{  
    %/iD@2r  
        'Recurse directory and search for text files f9ux+XQk9  
        Dim f As String iq*]CF  
        f = Dir$(in_dir & "*.txt") WR,MqM20  
        While f <> "" |C"(K-do  
            ReDim Preserve in_flist(fCount) (d mLEt  
            in_flist(fCount) = f &y_Ya%Z3*e  
            fCount += 1 "sh*,K5x|  
            f = Dir$() `Y]t*` e|  
        Wend AQ+MjS,  
        ReDim Preserve in_flist(fCount-1) AUjZYp  
    ;+C2P@M  
    End Sub )S"!)\4 b  
     
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