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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 iz9\D*or  
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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 >w2Q 1!  
    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。  `CA G8D  
    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。 2Ft8dfdm`  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 462!;/ y  
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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。 MK-a $~<  
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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) BN\fv,  
    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 nW $A^  
    例如下所示: &\"Y/b]  
    Sample name:  EDF-C1-56 [}A_uOGEP  
    Merging data from file EDF-C1-56 0-0.txt ){O1&|z-  
    Finished merging RPC data for sample EDF-C1-56 i!SW?\  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ;OQ'B=uK  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Jw:Fj {D  
    a. 创建一个新的散射库 pAJ=f}",]E  
    b. 散射模型命名 M>?aa6@0  
    c. 改变散射模型为“Tabulated BSDF”. k_*XJ<S!Y  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) I%;Rn:zl  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ilDJwZg#  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 ->&BcPLn  
    g. 点击OK Xzx[C_G  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Yl)eh(\&J  
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    脚本代码 Ud>`@2  
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    '#Language "WWB-COM" tk`: CT *  
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    Option Explicit xZ^ywa_  
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    Sub Main 'v'` F*6  
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        'Cleanup gq H`GI  
        ClearOutputWindow() F3r S6_  
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        Print "Merging RPC Photonics BSDF Data Files" I$aXnd6)  
        SetTextColor(255,0,0) Q?* nuE  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." u{g]gA8s  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." * T JBPM,  
        SetTextColor(0,0,0) {[Uti^)m%  
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        'Current directory of this script (should be the same as the text files being merged) I`/]@BdgY  
        Dim cDir As String a<f;\$h]  
        cDir = MacroDir$ & "\" vx04h~  
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        'Array which will be populated with the list of files to be merged m3U+ du  
        Dim fList() As String, curFile As String Xy[}Gp  
        GetFileList( cDir, fList ) ?D1x;i9<  
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        Print "" S8*^ss>?^R  
        Print "Files found for merging:" AU0$A403  
        For Each curFile In fList S#P+B*v  
            Print Chr(9) & curFile utq.r_  
        Next (YAI,Xnw  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. hA@zoIoe  
        Dim nameArray() As String, sampName As String GMEw  
        nameArray = Split(fList(0)," 0-0.txt") `ajx hp  
        sampName  = nameArray(0) H!Wis3S3G  
        Print "" $TR=3[j  
        Print "Sample name: " & Chr(9) & sampName HMF8;,<_w?  
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        'Open an output file and write the FRED header data J=@hk@Nq#  
        Dim outFile As String /r>IV`n{  
        outFile = cDir & sampName & "_FRED.txt" kX igX-  
        Open outFile For Output As #1 M,&tA1CH  
        Print #1, "type bsdf_data" grGhN q  
        Print #1, "format angles=deg bsdf=value scale=1" HpW" lYW4  
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        'Loop the file list, skip the two header lines and write the remaining data to file qO7fbql_  
        Dim lineArray() As String, curLine As Long l &}piC  
        For Each curFile In fList 0xN!DvCg>.  
            Print "Merging data from file " & curFile +z+ F-  
            ReadFile( cDir & curFile, lineArray ) 7Aqn[1{_O  
            For curLine = 2 To UBound(lineArray) XxhsPFv  
                Print #1, lineArray(curLine) =\M)6"}y}  
            Next :b"= KQ  
        Next I9;xzES  
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        'Close the output file |B 9t-  
        Close #1 K-Re"zsz  
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        Print "Finished merging RPC data for sample " & sampName [C~fBf5  
        Print "FRED formatted data file: " & Chr(9) & outFile ,cLH*@  
    End Sub 7@JjjV  
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    'Utility function to read the contents of a file into an array of strings. 0%/,>IR>r  
    Function ReadFile(ByVal fileName As String, _ B@d1xjp)']  
                      ByRef lineArray() As String) As Long E\ tL   
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        ReadFile = -1 ^#2xQ5h  
        Dim oFSO As Object '[%jjUU  
        Set oFSO = CreateObject("Scripting.FileSystemObject") d60c$?"]a(  
        Erase lineArray 2v4W6R  
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        Dim fid As Long X|,["Az 8  
        If oFSO.fileexists( fileName ) Then 5Wo5 n7o  
            fid = FreeFile() ;;M"hI3@  
            Open fileName For Input As fid \Ps5H5Qk;  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) -=5EbNPwG  
            Close fid xF&6e&nv  
        End If vlvvi()  
        Set oFSO = Nothing Z A[)  
        Return UBound( lineArray ) {y1q7Z.M  
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    End Function kY=rz&?U  
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    Sub GetFileList( ByVal in_dir As String, _ |hc\jb  
                     ByRef in_flist() As String ) 0Yp>+:#  
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        'Redimension the file list array M%3Wy"YQ,n  
        Erase in_flist w#sq'vo4%  
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        'Tracks how many files are found 0iF-}o  
        Dim fCount As Long S.1( 3j*  
        fCount = 0 6s5yyy=L%~  
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        'Recurse directory and search for text files g@Ld"5$^2  
        Dim f As String #,TELzUVE  
        f = Dir$(in_dir & "*.txt") ZvH?3Jy  
        While f <> "" ,[Ag~.T  
            ReDim Preserve in_flist(fCount) zz&vfO31J  
            in_flist(fCount) = f C!5I?z&  
            fCount += 1 f9a$$nb3`  
            f = Dir$() 0Q`&inwh  
        Wend Xo\S9,s{  
        ReDim Preserve in_flist(fCount-1) <1K7@Tu  
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    End Sub R#ya,L  
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