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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 Rf2;O<  
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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 Pou`PNvH  
    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。 ` *h-j/M  
    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。 5?%(j!p5  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 l;F3kA  
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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。 J=| fxR  
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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) IGOqV>;  
    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 :a[L-lr`e  
    例如下所示: 3dQV5E.  
    Sample name:  EDF-C1-56 qZG "{8  
    Merging data from file EDF-C1-56 0-0.txt Qc Ia%lf  
    Finished merging RPC data for sample EDF-C1-56 Nt'(JAZ;  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Xr6UN{_-  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 v; &-]ka  
    a. 创建一个新的散射库 *";,HG?|Iz  
    b. 散射模型命名 3-Xum*)Y  
    c. 改变散射模型为“Tabulated BSDF”. 7b \HbgZ  
    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 ) >N{K)a  
    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。 1^b-J0  
    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 egK,e?~  
    g. 点击OK mJ)o-BV  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 q.g<gu]  
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    脚本代码 <Gr{h>b  
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    '#Language "WWB-COM" Gt2NUGU  
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    Option Explicit NYm2fFPc  
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    Sub Main TmvI+AY/  
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        'Cleanup 4b,N"w{v  
        ClearOutputWindow() zdlysr#  
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        Print "Merging RPC Photonics BSDF Data Files" AQDT6E:  
        SetTextColor(255,0,0) b(wW;C'#0p  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 4 B"tz!  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Fi14_{  
        SetTextColor(0,0,0) >Ke4lO"  
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        'Current directory of this script (should be the same as the text files being merged) *[) b}?  
        Dim cDir As String 5<0&y3  
        cDir = MacroDir$ & "\" _%?}e|epy  
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        'Array which will be populated with the list of files to be merged `$ql>k-6C  
        Dim fList() As String, curFile As String <w}YD @(f  
        GetFileList( cDir, fList ) PxhB=i!'$  
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        Print "" t,gKN^P_  
        Print "Files found for merging:" <7~HG(ks  
        For Each curFile In fList !iN=py  
            Print Chr(9) & curFile K.Nun)<  
        Next e23}'qb  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. !_3R dS  
        Dim nameArray() As String, sampName As String 6}qp;mR E]  
        nameArray = Split(fList(0)," 0-0.txt") :aS8%m  
        sampName  = nameArray(0) H~Xi;[{7  
        Print "" kAsYh4[  
        Print "Sample name: " & Chr(9) & sampName <5%x3e"7u  
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        'Open an output file and write the FRED header data U p=J&^.  
        Dim outFile As String .]SE>3  
        outFile = cDir & sampName & "_FRED.txt" /o Q^j'v  
        Open outFile For Output As #1 $p#)xx7  
        Print #1, "type bsdf_data" u[5*RTE  
        Print #1, "format angles=deg bsdf=value scale=1" A.8{LY;  
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        'Loop the file list, skip the two header lines and write the remaining data to file ;7Cb!v1  
        Dim lineArray() As String, curLine As Long kTZ`RW&0  
        For Each curFile In fList aKkL0 D  
            Print "Merging data from file " & curFile j qfxQ  
            ReadFile( cDir & curFile, lineArray ) }pxMO? h$  
            For curLine = 2 To UBound(lineArray) xdGmiHN  
                Print #1, lineArray(curLine) FR"yGx#$  
            Next ZV=O oL t,  
        Next ca%s$' d  
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        'Close the output file Y3KKskhLx  
        Close #1 z UN&L7D  
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        Print "Finished merging RPC data for sample " & sampName CT(VV6I\  
        Print "FRED formatted data file: " & Chr(9) & outFile In<L?U?([D  
    End Sub \X1?,gV_  
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    'Utility function to read the contents of a file into an array of strings. E_ #MQ;n  
    Function ReadFile(ByVal fileName As String, _ }i0(^"SoXZ  
                      ByRef lineArray() As String) As Long lM oi5q  
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        ReadFile = -1 |+K3\b  
        Dim oFSO As Object \ t4:(Jp 3  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Z7>pz:,  
        Erase lineArray ?"-%>y@w  
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        Dim fid As Long M#ED49Dh>  
        If oFSO.fileexists( fileName ) Then !ZlBM{C  
            fid = FreeFile() 6%?bl{pNn  
            Open fileName For Input As fid l-4+{6lz  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) HQqnJ;ns<  
            Close fid %zDh07VT\  
        End If |&!04~s;E  
        Set oFSO = Nothing J=v" HeVm  
        Return UBound( lineArray ) c4H5[LPF  
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    End Function R{={7.As+  
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    Sub GetFileList( ByVal in_dir As String, _ eb%`ox@&  
                     ByRef in_flist() As String ) a ^wGc+  
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        'Redimension the file list array ffDh 0mDN  
        Erase in_flist )*6 ]m1  
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        'Tracks how many files are found qI (<5Wxl  
        Dim fCount As Long ]rk8Jsg  
        fCount = 0 sv}k_6XgY  
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        'Recurse directory and search for text files E&js`24 &  
        Dim f As String N_<wiwI<  
        f = Dir$(in_dir & "*.txt") k/'>,WE  
        While f <> "" (|Zah1k&]  
            ReDim Preserve in_flist(fCount) o!bIaeEaU  
            in_flist(fCount) = f ]nmVT~lBe"  
            fCount += 1 vq(ElXTO  
            f = Dir$() 0_\@!#-sml  
        Wend {DfXn1Cg0U  
        ReDim Preserve in_flist(fCount-1) &?[uY5Mk  
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    End Sub 1dsMmD[O  
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