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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 \\\%pBT7]\  
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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 D;~c`G "f  
    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。 _*(n2'2B  
    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。 u ##.t  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 zkFx2(Hq-f  
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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。 EfTuHg$pe  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) Uc j eB  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 =LP,+z  
    例如下所示: a@>P?N~LA9  
    Sample name:  EDF-C1-56 *U[Nn5#?  
    Merging data from file EDF-C1-56 0-0.txt P5vxQR_*lc  
    Finished merging RPC data for sample EDF-C1-56 jHP6d =  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt zOV.cI6fZz  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 !N, Oe<  
    a. 创建一个新的散射库 5Z2tTw'i  
    b. 散射模型命名 ;@I4[4ph}  
    c. 改变散射模型为“Tabulated BSDF”. I2U/ \  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 9DAk|K  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 5*Wo/%#q  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 H<hFA(M  
    g. 点击OK WH@CH4WM  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (T0%oina  
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    脚本代码 H)eecH$K  
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    '#Language "WWB-COM" W,\LdQ  
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    Option Explicit O@[jNs)].  
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    Sub Main G-5 4D_ 4  
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        'Cleanup %fv;C  
        ClearOutputWindow() O.ce"5Y^  
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        Print "Merging RPC Photonics BSDF Data Files" @raw8w\Zj+  
        SetTextColor(255,0,0) st|;] q9?  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." |oYqkP|  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." e@Cv')]B  
        SetTextColor(0,0,0) _8-iO.T+2  
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        'Current directory of this script (should be the same as the text files being merged) LF2@qvwD  
        Dim cDir As String  k|Xxr  
        cDir = MacroDir$ & "\" V>8)1)dF  
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        'Array which will be populated with the list of files to be merged -uE2h[X|  
        Dim fList() As String, curFile As String __F?iRrCM  
        GetFileList( cDir, fList ) 1$Jria5n  
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        Print "" `oDs]90  
        Print "Files found for merging:" /b$0).fj@,  
        For Each curFile In fList ~^6[SbVb  
            Print Chr(9) & curFile R<5GG|(B  
        Next hI&ugdf  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ]VYv>o`2  
        Dim nameArray() As String, sampName As String $p(,Qz(.8  
        nameArray = Split(fList(0)," 0-0.txt") }I1A4=d  
        sampName  = nameArray(0) >z(AQ  
        Print "" )]\?Yyg]  
        Print "Sample name: " & Chr(9) & sampName 5|4=uoA<  
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        'Open an output file and write the FRED header data c*5y8k  
        Dim outFile As String >.tP7=  
        outFile = cDir & sampName & "_FRED.txt" POnI&y]  
        Open outFile For Output As #1 lbRm(W(  
        Print #1, "type bsdf_data" C4#EN}  
        Print #1, "format angles=deg bsdf=value scale=1" y .+d3  
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        'Loop the file list, skip the two header lines and write the remaining data to file shjq4# 9  
        Dim lineArray() As String, curLine As Long Mp8FYPjZ  
        For Each curFile In fList qWQ7:*DL  
            Print "Merging data from file " & curFile i8]2y  
            ReadFile( cDir & curFile, lineArray ) dzK]F/L]  
            For curLine = 2 To UBound(lineArray) mt0ZD}E  
                Print #1, lineArray(curLine) .U66Uet>RX  
            Next d )}@0Q  
        Next &#AK#`&)0i  
    isdEs k#A.  
        'Close the output file bZ/4O*B  
        Close #1 RpAtd^I  
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        Print "Finished merging RPC data for sample " & sampName qtx5N)J6  
        Print "FRED formatted data file: " & Chr(9) & outFile z%F68 f73  
    End Sub uSAb  
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    'Utility function to read the contents of a file into an array of strings. M"E ]r=1  
    Function ReadFile(ByVal fileName As String, _ R^fk :3  
                      ByRef lineArray() As String) As Long C:]&V*d.v4  
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        ReadFile = -1 5M.KF;P  
        Dim oFSO As Object |bHId!d  
        Set oFSO = CreateObject("Scripting.FileSystemObject") cY}Nr#%s@U  
        Erase lineArray aCL_cVOMR  
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        Dim fid As Long 7\BGeI  
        If oFSO.fileexists( fileName ) Then ]^='aQ  
            fid = FreeFile() ~-"<)XPe  
            Open fileName For Input As fid A YC22(  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Kg#5 @;  
            Close fid c{iF  
        End If 64#6L.Q-c  
        Set oFSO = Nothing WIe2j  
        Return UBound( lineArray ) "S">#.L  
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    End Function )u. ut8![T  
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    Sub GetFileList( ByVal in_dir As String, _ *-!&5~o/U  
                     ByRef in_flist() As String ) \2rCT~x  
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        'Redimension the file list array 8gA:s`ofJ  
        Erase in_flist oEqt7l[I{  
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        'Tracks how many files are found )N) "O? W9  
        Dim fCount As Long ]t69a4&,#9  
        fCount = 0 >3S^9{d  
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        'Recurse directory and search for text files ++s=$D  
        Dim f As String 7VP[U,  
        f = Dir$(in_dir & "*.txt") )xJo/{?  
        While f <> "" 'qosw:P  
            ReDim Preserve in_flist(fCount) SI:+I4i  
            in_flist(fCount) = f D@Zb|EI%<  
            fCount += 1 EW* 's(  
            f = Dir$() OVsZUmSG  
        Wend va(ZGGS]N  
        ReDim Preserve in_flist(fCount-1) iU5Aj:U3  
    ; rSpM  
    End Sub pg}9baW?  
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