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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 2su/I  
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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 g& ?{^4t]  
    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。 '0 J*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。 a?8boN(  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 nr- 32u  
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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。 4{CeV7  
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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) J *;= f8  
    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 pI1IDu*_Z  
    例如下所示: ^:Fj+d  
    Sample name:  EDF-C1-56 H_>9'(  
    Merging data from file EDF-C1-56 0-0.txt X|dlVNL8p  
    Finished merging RPC data for sample EDF-C1-56 h8hyQd$!  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Ff&kK5} q  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 *~Sv\L  
    a. 创建一个新的散射库 }0AoV&75  
    b. 散射模型命名 Mew,g:m:  
    c. 改变散射模型为“Tabulated BSDF”. DLD5>  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) }j;G`mV2  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 tX~ *.W:  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 R^&.:;Wi>  
    g. 点击OK vq:?a  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 9NeHN@D)  
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    脚本代码 xv~Sk2Z+d  
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    '#Language "WWB-COM" uP$C2glyz  
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    Option Explicit *=X61`0  
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    Sub Main @ )Nw>/; o  
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        'Cleanup "P yG;N!W  
        ClearOutputWindow() G.]'pn  
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        Print "Merging RPC Photonics BSDF Data Files" Q%x-BZb~  
        SetTextColor(255,0,0) </!GU*  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 5O[\gd-  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ng:B;; m  
        SetTextColor(0,0,0) ?D;7ut$~  
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        'Current directory of this script (should be the same as the text files being merged) `t3w|%La}  
        Dim cDir As String & tjL*/  
        cDir = MacroDir$ & "\" lQ&J2H<w  
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        'Array which will be populated with the list of files to be merged Cs2kbG_  
        Dim fList() As String, curFile As String g[ N3jt@  
        GetFileList( cDir, fList ) uc aa;zj  
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        Print "" E8L\3V4  
        Print "Files found for merging:" {9v Mc  
        For Each curFile In fList iLQ;`/j  
            Print Chr(9) & curFile )v\ A8)[  
        Next CbFO9q  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. <l5s[  
        Dim nameArray() As String, sampName As String ~d-Q3n?zR  
        nameArray = Split(fList(0)," 0-0.txt") 9r> iP L2H  
        sampName  = nameArray(0) 'LYN{  
        Print "" !uP8powO  
        Print "Sample name: " & Chr(9) & sampName :9f 9Z7M  
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        'Open an output file and write the FRED header data Vg}+w Nt5  
        Dim outFile As String .EZ8yJj1Q  
        outFile = cDir & sampName & "_FRED.txt" +/ ?oyC+Z  
        Open outFile For Output As #1 )JY#8,{w  
        Print #1, "type bsdf_data" e5(c,,/  
        Print #1, "format angles=deg bsdf=value scale=1" .|@2Uf  
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        'Loop the file list, skip the two header lines and write the remaining data to file p-*{x  
        Dim lineArray() As String, curLine As Long 6Ev+!!znu  
        For Each curFile In fList pnUL+UYeM  
            Print "Merging data from file " & curFile 9Zr6 KA{  
            ReadFile( cDir & curFile, lineArray ) x"A\ Z-xxz  
            For curLine = 2 To UBound(lineArray) KQ ^E\,@o  
                Print #1, lineArray(curLine) 4lI&y<F  
            Next NR"C@3kD]o  
        Next A@Cvx7X  
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        'Close the output file A4 /gVi|  
        Close #1 3zv0Nwb,  
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        Print "Finished merging RPC data for sample " & sampName >M^:x-mib  
        Print "FRED formatted data file: " & Chr(9) & outFile D;z!C ys  
    End Sub }(oWXwFb&W  
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    'Utility function to read the contents of a file into an array of strings. |@VhR(^O$  
    Function ReadFile(ByVal fileName As String, _ pZ]&M@Ijp  
                      ByRef lineArray() As String) As Long xl Q]"sm1  
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        ReadFile = -1 58R.`5B  
        Dim oFSO As Object zb s7G  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 3Xy~ap>Y  
        Erase lineArray 5sSAH  
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        Dim fid As Long &{q<  
        If oFSO.fileexists( fileName ) Then EyHL&  
            fid = FreeFile() *+(eH#_2/  
            Open fileName For Input As fid qDgy7kkQ  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) qcge#S>  
            Close fid ^S 45!mSb  
        End If $01~G?:]`  
        Set oFSO = Nothing U G4I @@=  
        Return UBound( lineArray ) ]Bs{9=2  
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    End Function ru|*xNXKgC  
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    Sub GetFileList( ByVal in_dir As String, _ wUL 5"\  
                     ByRef in_flist() As String ) 7>F[7_  
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        'Redimension the file list array &q M8)2Y  
        Erase in_flist J&B5Ll  
    @z:E]O}  
        'Tracks how many files are found &8I*N6p:%/  
        Dim fCount As Long ,$U~<Zd  
        fCount = 0 uo ;m  
    W$W w/mcl+  
        'Recurse directory and search for text files Tl#2w=  
        Dim f As String bfYVA2=Z  
        f = Dir$(in_dir & "*.txt") \7IT[<Se  
        While f <> "" `fl$ o6S/  
            ReDim Preserve in_flist(fCount) tKds|0,j|  
            in_flist(fCount) = f [.6bxK  
            fCount += 1 AUES;2WL  
            f = Dir$() wFjQ1<s=  
        Wend =5:S"WNj  
        ReDim Preserve in_flist(fCount-1) (Ffa{Tt!  
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    End Sub BkY#wJ'  
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