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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 B.;@i;7L  
    J P5en  
    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 Z#(Y%6[u  
    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。 suW|hh1/Ya  
    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。 *QI Yq  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 %g89eaEZ  
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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。 & ,:!gYN  
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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) "L1LL iS  
    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 bb\XZ~)F  
    例如下所示: ZU `~@.`i  
    Sample name:  EDF-C1-56 Bt5 P][<  
    Merging data from file EDF-C1-56 0-0.txt rnp; R  
    Finished merging RPC data for sample EDF-C1-56 [e@m -/B  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt A{k1MA<F6  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 8;c\} D  
    a. 创建一个新的散射库 O@W/s!&lFa  
    b. 散射模型命名 6#K.n&=*  
    c. 改变散射模型为“Tabulated BSDF”. P>)J:.tr0  
    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 ) S~ S>62  
    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。 xfC$u`e=  
    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 T5e#Ll/  
    g. 点击OK X eY[;}9  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 `d4xX@  
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    脚本代码 B]}gfVO  
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    '#Language "WWB-COM" /-m)  
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    Option Explicit @JLN3  
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    Sub Main #f_'&m  
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        'Cleanup s|c}9/Xe)  
        ClearOutputWindow() =2DK?]K;  
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        Print "Merging RPC Photonics BSDF Data Files" w9RBT(u  
        SetTextColor(255,0,0) uTPAf^|  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." =3SJl1w1  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." J|be'V#]1  
        SetTextColor(0,0,0) f\q5{#"z  
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        'Current directory of this script (should be the same as the text files being merged) re#]zc<  
        Dim cDir As String 5 $$Cav  
        cDir = MacroDir$ & "\" 61&{I>~1  
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        'Array which will be populated with the list of files to be merged OT=1doDp  
        Dim fList() As String, curFile As String Rbr:Q]zGN  
        GetFileList( cDir, fList ) Y"KJ`Rx  
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        Print "" n+Conp/  
        Print "Files found for merging:" #2:?N8vz*  
        For Each curFile In fList yM9>)SE5`  
            Print Chr(9) & curFile -r_\=<(  
        Next z j#<X  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. KSEKoHJo  
        Dim nameArray() As String, sampName As String f? GoBh<  
        nameArray = Split(fList(0)," 0-0.txt") /-^J0f+l3  
        sampName  = nameArray(0) 'W54 T  
        Print "" KydAFxUb  
        Print "Sample name: " & Chr(9) & sampName I?%q`GyP5  
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        'Open an output file and write the FRED header data K^tc]ZQ  
        Dim outFile As String /YJBRU2  
        outFile = cDir & sampName & "_FRED.txt" )^4Ljb1  
        Open outFile For Output As #1 <&O*' <6C  
        Print #1, "type bsdf_data" mJ5%+.V  
        Print #1, "format angles=deg bsdf=value scale=1" q(hBqUW  
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        'Loop the file list, skip the two header lines and write the remaining data to file QkD]9#Id&  
        Dim lineArray() As String, curLine As Long #r?[@aJ  
        For Each curFile In fList xw_$1 S  
            Print "Merging data from file " & curFile @]}/vsI m  
            ReadFile( cDir & curFile, lineArray ) 8'TIDu  
            For curLine = 2 To UBound(lineArray) dBovcc  
                Print #1, lineArray(curLine) `nEqw/I  
            Next GVn'p Wg  
        Next #8M^;4N >[  
    %{:pBt:Z  
        'Close the output file 7 H:y=?X6  
        Close #1 0YfmAF$/B  
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        Print "Finished merging RPC data for sample " & sampName 8@S]P0lk  
        Print "FRED formatted data file: " & Chr(9) & outFile rLmc(-q  
    End Sub ~Jsu"kr  
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    'Utility function to read the contents of a file into an array of strings. t>*(v#WeZ  
    Function ReadFile(ByVal fileName As String, _ 60A!Gob  
                      ByRef lineArray() As String) As Long 8<C@I/  
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        ReadFile = -1 l. l)w  
        Dim oFSO As Object NYG!\u\Rm  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 5P\A++2 2Y  
        Erase lineArray kv+^U^WoU  
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        Dim fid As Long /z`tI  
        If oFSO.fileexists( fileName ) Then L;{{P7  
            fid = FreeFile() di9OQ*6a7  
            Open fileName For Input As fid eK*oV}U-k  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0_+ & [g}  
            Close fid qIQ 61><  
        End If O#O"]A  
        Set oFSO = Nothing Vmh$c*TE  
        Return UBound( lineArray ) 7j&EQm5\9  
    ;E.f%   
    End Function s] ;P<  
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    Sub GetFileList( ByVal in_dir As String, _ \awkt!Wa  
                     ByRef in_flist() As String ) *f>\X[wN  
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        'Redimension the file list array Gx}`_[-  
        Erase in_flist <&#]|HGc  
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        'Tracks how many files are found Eaxsg  
        Dim fCount As Long qP##C&+#q  
        fCount = 0 cTRtMk%^  
    2*#i/SE_  
        'Recurse directory and search for text files U@n5:d=  
        Dim f As String K `<HZK  
        f = Dir$(in_dir & "*.txt") Hy,""Py  
        While f <> "" 1-PlRQs.1  
            ReDim Preserve in_flist(fCount) }YM\IPsPu  
            in_flist(fCount) = f @V5i  
            fCount += 1 H8dS]N~[Y  
            f = Dir$() Sj|tR[SAoD  
        Wend soQ[Zg4}  
        ReDim Preserve in_flist(fCount-1) g"m9[R=]6  
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    End Sub ^EkxZ4*g  
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