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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 EkOn Rm_hn  
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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 C?rb}(m  
    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。 9Z:pss@  
    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。 HmV JkkksJ  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 3ZAzv en  
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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。  P!/:yWd  
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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) =/N0^  
    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 7': <I- Fm  
    例如下所示: F'55BY*!  
    Sample name:  EDF-C1-56 yiczRex%rq  
    Merging data from file EDF-C1-56 0-0.txt VjSA& R  
    Finished merging RPC data for sample EDF-C1-56 s=XqI@  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt k")3R}mX  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 A:?w1"7gT  
    a. 创建一个新的散射库 (!<G` ;}u  
    b. 散射模型命名 h-@_.&P0e  
    c. 改变散射模型为“Tabulated BSDF”. d`KW]HJw  
    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 ) (XQl2C  
    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。 y|%lw%cSe  
    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 'L6+B1Op  
    g. 点击OK IUy5=Sl   
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 vFGVz  
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    脚本代码 -axmfE?g0  
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    '#Language "WWB-COM" R(A"6a8*  
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    Option Explicit y/ah<Y0(  
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    Sub Main |R>I#NO5  
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        'Cleanup Z9lfd6MU,  
        ClearOutputWindow() K9UWyM<(2C  
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        Print "Merging RPC Photonics BSDF Data Files" nB , &m&  
        SetTextColor(255,0,0) mr`EcO0  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." qo0]7m7|  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 86f/R c  
        SetTextColor(0,0,0) 2aGK}sS6  
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        'Current directory of this script (should be the same as the text files being merged) Fy]j33E  
        Dim cDir As String 51x)fZQ  
        cDir = MacroDir$ & "\" ,9ZN k@q  
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        'Array which will be populated with the list of files to be merged YS&Q4nv-  
        Dim fList() As String, curFile As String 31}kNc}n  
        GetFileList( cDir, fList ) }5Pzen  
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        Print "" 3+r8yiY  
        Print "Files found for merging:" <o\I C?A  
        For Each curFile In fList V s1Z$HS`  
            Print Chr(9) & curFile #k<j`0kiq  
        Next L-(.v*  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. cXvq=Rb  
        Dim nameArray() As String, sampName As String @C6.~OiP  
        nameArray = Split(fList(0)," 0-0.txt") i9k/X&V  
        sampName  = nameArray(0) 38eeRo  
        Print "" /CN`U7:E  
        Print "Sample name: " & Chr(9) & sampName Gd%E337d  
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        'Open an output file and write the FRED header data ) %&~CW+  
        Dim outFile As String B@2VI 1%  
        outFile = cDir & sampName & "_FRED.txt" }W k!):=y  
        Open outFile For Output As #1 (lVHKg&U[  
        Print #1, "type bsdf_data" 7{e*isV  
        Print #1, "format angles=deg bsdf=value scale=1" QGQ> shIeZ  
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        'Loop the file list, skip the two header lines and write the remaining data to file r+%}XS%;h  
        Dim lineArray() As String, curLine As Long ]J7.d$7T  
        For Each curFile In fList (-U6woB6o  
            Print "Merging data from file " & curFile P>3 ;M'KsO  
            ReadFile( cDir & curFile, lineArray ) G\ht)7SGgf  
            For curLine = 2 To UBound(lineArray) ?ydqmj2[F  
                Print #1, lineArray(curLine) [q{[Avqf  
            Next Cl5l+I\1  
        Next 11(:#4Y,  
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        'Close the output file 3@/\j^U  
        Close #1 0xYPK7a=L\  
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        Print "Finished merging RPC data for sample " & sampName F"<TV&xf  
        Print "FRED formatted data file: " & Chr(9) & outFile 69$[yt>KYz  
    End Sub %Z=%E!*  
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    'Utility function to read the contents of a file into an array of strings. @H^Yf  
    Function ReadFile(ByVal fileName As String, _ a.yCd/  
                      ByRef lineArray() As String) As Long vC9Qe ]f  
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        ReadFile = -1 Xo:!U=m/#  
        Dim oFSO As Object !w8t`Z['  
        Set oFSO = CreateObject("Scripting.FileSystemObject")  ]%L?b-e  
        Erase lineArray  bK|I  
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        Dim fid As Long 9=J+5V^qD<  
        If oFSO.fileexists( fileName ) Then #DI%l`B  
            fid = FreeFile() eZMDtB  
            Open fileName For Input As fid ;5bzXW#U  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) .A. VOf_  
            Close fid OJGEX}3'  
        End If F5|6*K  
        Set oFSO = Nothing ^"e|)4_5\  
        Return UBound( lineArray ) NM;0@ o  
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    End Function '*~_!lE5  
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    Sub GetFileList( ByVal in_dir As String, _ AUm"^-@x#>  
                     ByRef in_flist() As String ) 4iD-jM_D  
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        'Redimension the file list array oWu2}#~z_  
        Erase in_flist 1yS [;  
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        'Tracks how many files are found :QGd/JX$n`  
        Dim fCount As Long t0 1@h_ WS  
        fCount = 0 NYoh6AR  
    \CP)$0j-&o  
        'Recurse directory and search for text files 3:Mq4 0]x  
        Dim f As String .S l{m[nV8  
        f = Dir$(in_dir & "*.txt") Nm.H  
        While f <> "" iz&$q]P8  
            ReDim Preserve in_flist(fCount) .K=r.tf~  
            in_flist(fCount) = f fZqqU|tq  
            fCount += 1  jIMT&5k  
            f = Dir$() \{HbL,s  
        Wend zq=X;}qYj  
        ReDim Preserve in_flist(fCount-1) sw={bUr6G`  
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    End Sub x +=zG4Hm  
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