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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: 2025-07-22
    摘要 ~^V&n`*7D  
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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 uT4|43< G  
    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。 `vgaX,F*  
    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。 z__?kY  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 *>KBDFI  
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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。 wCB*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) e))L&s  
    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 9+^)?JUYll  
    例如下所示: .{h"0<x  
    Sample name:  EDF-C1-56 3WJk04r  
    Merging data from file EDF-C1-56 0-0.txt n jWe^  
    Finished merging RPC data for sample EDF-C1-56 2CO/K_Q  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt { uaDpRt  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,UMr_ e{|  
    a. 创建一个新的散射库 <.QaOLD  
    b. 散射模型命名 DFK@/.V  
    c. 改变散射模型为“Tabulated BSDF”. M`H#Qo5/  
    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 ) w}>%E6UY  
    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。 ,G t!nm_  
    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 oQ<[`.s  
    g. 点击OK k.ou$mIY  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 0%rDDB  
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    脚本代码 M?eP1v:<+G  
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    '#Language "WWB-COM" T+}|$/Tv  
    PN l/}'  
    Option Explicit K=[7<b,:3  
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    Sub Main {5E8eQ  
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        'Cleanup +?{"Q#.>;  
        ClearOutputWindow() x z8e1M  
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        Print "Merging RPC Photonics BSDF Data Files" 2`$*HPj+G  
        SetTextColor(255,0,0) 0+FPAqX  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." w*VN =  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." L/tpT?$fi  
        SetTextColor(0,0,0) NZvgkci_(u  
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        'Current directory of this script (should be the same as the text files being merged) L@S\ rImw  
        Dim cDir As String D$}8GYq  
        cDir = MacroDir$ & "\"  pux IJ  
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        'Array which will be populated with the list of files to be merged '@t$3 hk  
        Dim fList() As String, curFile As String kw#X,h P  
        GetFileList( cDir, fList ) Zd[rn:9\  
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        Print "" fs 'SCwx  
        Print "Files found for merging:" ; j!dbT~5  
        For Each curFile In fList '? 5-  
            Print Chr(9) & curFile 3x+lf4"  
        Next !<p,G`r  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 6Rn?pe^  
        Dim nameArray() As String, sampName As String >a?Bk4w  
        nameArray = Split(fList(0)," 0-0.txt") 'Cc~|gOgD  
        sampName  = nameArray(0) ~S8:xG+s  
        Print "" J?8Mo=UZz  
        Print "Sample name: " & Chr(9) & sampName u9hd%}9Qd?  
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        'Open an output file and write the FRED header data )UKX\nD"0  
        Dim outFile As String *:n~j9V-  
        outFile = cDir & sampName & "_FRED.txt" ..)J6L5l  
        Open outFile For Output As #1 \?xM% (:<Q  
        Print #1, "type bsdf_data" %biie  
        Print #1, "format angles=deg bsdf=value scale=1" -l= 4{^pK  
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        'Loop the file list, skip the two header lines and write the remaining data to file fqgp{(`@>  
        Dim lineArray() As String, curLine As Long !Y~UO)u2  
        For Each curFile In fList Ln h =y2  
            Print "Merging data from file " & curFile uHgq"e  
            ReadFile( cDir & curFile, lineArray ) 9J3fiA_  
            For curLine = 2 To UBound(lineArray) 6.D|\;9{c  
                Print #1, lineArray(curLine) E_ns4k#uG  
            Next ?})A-$f ~  
        Next r2=@1=?8  
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        'Close the output file :ppaq  
        Close #1 ! ?g+'OM  
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        Print "Finished merging RPC data for sample " & sampName :$k*y%Z*N&  
        Print "FRED formatted data file: " & Chr(9) & outFile pa>C}jk}6  
    End Sub #t ;`  
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    'Utility function to read the contents of a file into an array of strings. 2&1mI>:F  
    Function ReadFile(ByVal fileName As String, _ =)Xj[NNRT  
                      ByRef lineArray() As String) As Long UGcmzwE  
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        ReadFile = -1 2%%\jlT_  
        Dim oFSO As Object igxO:]?  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 2HeX( rB  
        Erase lineArray j"qND=15  
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        Dim fid As Long  !VGG2N8  
        If oFSO.fileexists( fileName ) Then /WN YS  
            fid = FreeFile() >#]A2,  
            Open fileName For Input As fid )~U1sW&t  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) FIq'W:q:  
            Close fid =QqH`.3  
        End If #3&@FzD_P  
        Set oFSO = Nothing q'mh*  
        Return UBound( lineArray ) !..<_qfw  
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    End Function (]]hSkE  
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    Sub GetFileList( ByVal in_dir As String, _ @:>"VP<(  
                     ByRef in_flist() As String ) ,Z{\YAh1  
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        'Redimension the file list array w!f2~j~  
        Erase in_flist 2"ax*MQH<^  
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        'Tracks how many files are found tV)CDA&Z  
        Dim fCount As Long *ID=X!v  
        fCount = 0 :;{M0  
    ]oGd,v X  
        'Recurse directory and search for text files a"jE\OZ{+s  
        Dim f As String 2) X#&IE  
        f = Dir$(in_dir & "*.txt") x UdF.c  
        While f <> "" -XBZ1q  
            ReDim Preserve in_flist(fCount) &4?&tGi  
            in_flist(fCount) = f /QXUD.( 8  
            fCount += 1 ` Ig5*X4|  
            f = Dir$() R"t#dG]1t  
        Wend '/>Mr!H#  
        ReDim Preserve in_flist(fCount-1) a'VQegP(f\  
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    End Sub CS[]T9|_  
     
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