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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 F,)%?<!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 'K{Z{[s{  
    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。 qfRH5)k  
    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。 t$#jL5  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 8::$AQL3  
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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。 en*GM}<V  
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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) zz4N5["  
    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 "v({ ,  
    例如下所示: ^)*-Bo)I  
    Sample name:  EDF-C1-56 7f!YoW;1  
    Merging data from file EDF-C1-56 0-0.txt TOXfWEU3>  
    Finished merging RPC data for sample EDF-C1-56 y^v6AM  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt !SdSE^lz`  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 6){]1h"  
    a. 创建一个新的散射库 8MzVOF{"  
    b. 散射模型命名 9}F*P669f  
    c. 改变散射模型为“Tabulated BSDF”. [dIXR  
    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 ) X1-'COQS%&  
    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。 d,Yw5$i  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 EZ$>.iy{  
    g. 点击OK (VEpVn3{  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 yS(fILV  
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    脚本代码 z Q`jP$2  
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    '#Language "WWB-COM" Mh/dpb\Z  
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    Option Explicit %'7lbpy,f  
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    Sub Main ~8P!XAU56%  
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        'Cleanup :LRYYw  
        ClearOutputWindow() L`p4->C9A  
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        Print "Merging RPC Photonics BSDF Data Files" RcM/!,B  
        SetTextColor(255,0,0) CpeU5 o@  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." e2t-4} ww  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." b TM{l.Aq3  
        SetTextColor(0,0,0) _%!c+f7  
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        'Current directory of this script (should be the same as the text files being merged) #W'HR  
        Dim cDir As String >qjq=Ege  
        cDir = MacroDir$ & "\" ()Y4v  
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        'Array which will be populated with the list of files to be merged KgiJUO`PR  
        Dim fList() As String, curFile As String :'3XAntZA  
        GetFileList( cDir, fList ) ;/fF,L{c  
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        Print "" : $Y9jR  
        Print "Files found for merging:" ")dH,:#S  
        For Each curFile In fList Ax?y  
            Print Chr(9) & curFile m4&h>9. 8  
        Next Mg OR2,cR  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. BJB^m|b)  
        Dim nameArray() As String, sampName As String */|lJm'R  
        nameArray = Split(fList(0)," 0-0.txt") O[s{ Gk'>  
        sampName  = nameArray(0) W<$Z=(_v  
        Print "" ;8*`{F[  
        Print "Sample name: " & Chr(9) & sampName d + /&?3  
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        'Open an output file and write the FRED header data L[H5NUG!  
        Dim outFile As String h[1MtmNw  
        outFile = cDir & sampName & "_FRED.txt" ujaG Ng?,  
        Open outFile For Output As #1 jR2 2t`4  
        Print #1, "type bsdf_data" Q}K#'Og  
        Print #1, "format angles=deg bsdf=value scale=1" 5b/|!{  
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        'Loop the file list, skip the two header lines and write the remaining data to file T:Hr&ws4  
        Dim lineArray() As String, curLine As Long  , ^;)<[  
        For Each curFile In fList QP)pgAc  
            Print "Merging data from file " & curFile L ugn 3+  
            ReadFile( cDir & curFile, lineArray ) ng:9 l3 x  
            For curLine = 2 To UBound(lineArray) L%K\C  
                Print #1, lineArray(curLine) S\5bmvqP"  
            Next 4.h=&jz&  
        Next {u\Mj  
    " '6;/N  
        'Close the output file ]2'na?q9  
        Close #1 J(%0z:exs  
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        Print "Finished merging RPC data for sample " & sampName '0uh D.|G  
        Print "FRED formatted data file: " & Chr(9) & outFile +~roU{& o  
    End Sub C] 9 p5Hs  
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    'Utility function to read the contents of a file into an array of strings. kc @[9eV  
    Function ReadFile(ByVal fileName As String, _ .k9{Yv0  
                      ByRef lineArray() As String) As Long x~{;TZa[I  
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        ReadFile = -1 )0e2ic/  
        Dim oFSO As Object xD /9F18  
        Set oFSO = CreateObject("Scripting.FileSystemObject") .tmiQ.  
        Erase lineArray R:AA,^Z  
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        Dim fid As Long M- 2Tz[  
        If oFSO.fileexists( fileName ) Then 3 M10fI?  
            fid = FreeFile() ELjK0pE}-  
            Open fileName For Input As fid o|iYd n\  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) lR`'e0Lq  
            Close fid Gqcz< =/  
        End If W$o2 7f  
        Set oFSO = Nothing kWb2F7m  
        Return UBound( lineArray ) >'5_Y]h4m|  
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    End Function 9lj!C '  
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    Sub GetFileList( ByVal in_dir As String, _ Xy5s^82?  
                     ByRef in_flist() As String ) y"<))-MH  
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        'Redimension the file list array 5,;`$'?a%  
        Erase in_flist /?6|&  
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        'Tracks how many files are found C"qU-&*v  
        Dim fCount As Long q$.{j"cZV  
        fCount = 0 Op? OruT[  
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        'Recurse directory and search for text files XJ+6FT/qss  
        Dim f As String cx$Gic:4  
        f = Dir$(in_dir & "*.txt") %F9{EXJy  
        While f <> "" &Q=ZwC7#  
            ReDim Preserve in_flist(fCount) [;oCYb$9  
            in_flist(fCount) = f W Qzj[  
            fCount += 1 qxMnp}O  
            f = Dir$() 3q:{1rc  
        Wend Y'3}G<'%  
        ReDim Preserve in_flist(fCount-1) Koln9'tB  
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    End Sub ExXM:1 e26  
     
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