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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 Iff9'TE  
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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 'mI'dG  
    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。 Vcd.mE(t%  
    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。 2Q;9G6p  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 :akT 'q#  
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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。 !lo/xQ<  
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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) ,C3,TkA]  
    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 4k./(f2+  
    例如下所示: c8Z wr]DF  
    Sample name:  EDF-C1-56 tabT0  
    Merging data from file EDF-C1-56 0-0.txt 8Sz})UZ  
    Finished merging RPC data for sample EDF-C1-56 fnx-s{c?  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt [qsEUc+Z.'  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 O-)-YVU  
    a. 创建一个新的散射库 IK*07h/!  
    b. 散射模型命名 +{sqcr1G  
    c. 改变散射模型为“Tabulated BSDF”. x@8a''  
    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 ) /VG2.:  
    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。 6(P M'@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 `6+"Z=:  
    g. 点击OK hy|b6wF&  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 OR[{PU=X  
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    脚本代码 ^*fQX1h<  
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    '#Language "WWB-COM" }@.|?2b +  
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    Option Explicit e{Z &d  
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    Sub Main q+,Q<2J  
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        'Cleanup Sp@-p9#  
        ClearOutputWindow() ;;&}5jcV  
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        Print "Merging RPC Photonics BSDF Data Files" v+9 9 -.  
        SetTextColor(255,0,0) y(K" -?  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 0Won9P  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." O*#*%RL|  
        SetTextColor(0,0,0) 6Aocm R0D'  
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        'Current directory of this script (should be the same as the text files being merged) 47J5oPT2'  
        Dim cDir As String 7`u$  
        cDir = MacroDir$ & "\" irjP>3_e  
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        'Array which will be populated with the list of files to be merged ->N8#XH2=  
        Dim fList() As String, curFile As String sJNFFOz  
        GetFileList( cDir, fList ) {z|;Xi::"  
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        Print "" ;| 1$Q!4  
        Print "Files found for merging:" NVRLrJWpp  
        For Each curFile In fList u{L!n$D7  
            Print Chr(9) & curFile 3po:xMY  
        Next Z(Jt~a3o  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. _o8 ?E&d  
        Dim nameArray() As String, sampName As String /&4U6a  
        nameArray = Split(fList(0)," 0-0.txt") bJD;>"*  
        sampName  = nameArray(0) -44&#l^}_u  
        Print "" Vx-7\NB  
        Print "Sample name: " & Chr(9) & sampName i&n'N8D@  
    ]kboG%Dl?9  
        'Open an output file and write the FRED header data }}<z/zN&^  
        Dim outFile As String --DoB=5%8  
        outFile = cDir & sampName & "_FRED.txt" ^b %0 B  
        Open outFile For Output As #1 G+F: 99A  
        Print #1, "type bsdf_data" sq'Pyz[[  
        Print #1, "format angles=deg bsdf=value scale=1" Q`D_|L  
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        'Loop the file list, skip the two header lines and write the remaining data to file p'om-  
        Dim lineArray() As String, curLine As Long aFLO{tr`  
        For Each curFile In fList H$6`{lx,  
            Print "Merging data from file " & curFile 1x,tu}<u^  
            ReadFile( cDir & curFile, lineArray ) //aF5 :Y#  
            For curLine = 2 To UBound(lineArray) 4 uQT5  
                Print #1, lineArray(curLine) ZzX~&95G  
            Next ."Y e\>k  
        Next {` w;39$+  
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        'Close the output file M.>l#4s,'  
        Close #1 Ox@P6|m  
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        Print "Finished merging RPC data for sample " & sampName )l#E}Uz  
        Print "FRED formatted data file: " & Chr(9) & outFile {*ob_oc  
    End Sub [ I/<_AT#  
    }RP @!=  
    'Utility function to read the contents of a file into an array of strings. I&YSQK:b  
    Function ReadFile(ByVal fileName As String, _ uyY|v$FM  
                      ByRef lineArray() As String) As Long fYW6b[lI  
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        ReadFile = -1 [VWUqlNt>  
        Dim oFSO As Object kTvd+TP4  
        Set oFSO = CreateObject("Scripting.FileSystemObject") x@Hc@R<!  
        Erase lineArray 3@]SKfoo1  
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        Dim fid As Long &ZQJ>#~j^  
        If oFSO.fileexists( fileName ) Then fS`$'BQ  
            fid = FreeFile() -xP!"  
            Open fileName For Input As fid .e3+s*  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) >&U,co$>  
            Close fid \oZ5JoO  
        End If J.| +ID+  
        Set oFSO = Nothing 9tqF8pb7v  
        Return UBound( lineArray ) _hk.2FV:3m  
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    End Function 7!N2-6GV  
    $ O5UyKI  
    Sub GetFileList( ByVal in_dir As String, _ wLH] <k  
                     ByRef in_flist() As String ) Alxx[l\<J  
    E^ SH\5B  
        'Redimension the file list array Pp5^@A  
        Erase in_flist NW&b&o  
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        'Tracks how many files are found @#-q^}3  
        Dim fCount As Long X ' "SVO.  
        fCount = 0 `FC(  
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        'Recurse directory and search for text files ih;]nJ]+-  
        Dim f As String Kp,M"Y  
        f = Dir$(in_dir & "*.txt") fP `b>]N_  
        While f <> "" J":,Vd!*-  
            ReDim Preserve in_flist(fCount) $ <#KA3o\  
            in_flist(fCount) = f HF.^ysI  
            fCount += 1 go<W( ,O  
            f = Dir$() 1{r)L{]  
        Wend q+vx_4  
        ReDim Preserve in_flist(fCount-1) yu/`h5&*  
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    End Sub M )2`+/4  
     
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