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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 D=m 'pL/pl  
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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 _8Kx6s%  
    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。 F *FwRj  
    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。 ?HF%(>M  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 -gSUjP  
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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。 h 3]wL.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) F a'k0/_j  
    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 *s9C!w YMZ  
    例如下所示: 0"CG7Vg,zh  
    Sample name:  EDF-C1-56 +qh[N@F  
    Merging data from file EDF-C1-56 0-0.txt Ecd;<$tk  
    Finished merging RPC data for sample EDF-C1-56 Hemq +]6^  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 1pArZzm>  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ='`/BY(m[  
    a. 创建一个新的散射库 {&jb5-*f  
    b. 散射模型命名  IiY/(N+J  
    c. 改变散射模型为“Tabulated BSDF”. #Q2Y&2`yGT  
    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 ) T:5fc2Ngv  
    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。 (M*FIX  
    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 cWoPB _  
    g. 点击OK UK<Nj<-'t  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ZosP(Tdq  
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    脚本代码 b )B? F  
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    '#Language "WWB-COM" |&RU/a  
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    Option Explicit 0g+'/+Ho 4  
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    Sub Main 8_{X1bj  
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        'Cleanup .Y&)4+ckL  
        ClearOutputWindow() a!=D[Gz*5  
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        Print "Merging RPC Photonics BSDF Data Files" N@t|7~  
        SetTextColor(255,0,0) etTn_v  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." u6AA4(  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." $<}$DH_Y  
        SetTextColor(0,0,0) \WxukYH  
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        'Current directory of this script (should be the same as the text files being merged) wne,e's}   
        Dim cDir As String JpXlBEio%  
        cDir = MacroDir$ & "\" I}1NB3>^  
    '<"s \,  
        'Array which will be populated with the list of files to be merged 0yD9SJn  
        Dim fList() As String, curFile As String <g"{Wv: h  
        GetFileList( cDir, fList ) e)d`pQ6  
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        Print "" Dfmjw  
        Print "Files found for merging:" nAv#?1cjz  
        For Each curFile In fList j0oR) du  
            Print Chr(9) & curFile ?8'*,bK  
        Next 'uBu6G  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 32&;`]C  
        Dim nameArray() As String, sampName As String ]n6#VTz*  
        nameArray = Split(fList(0)," 0-0.txt") 8Vr%n2M  
        sampName  = nameArray(0) Y3Yz)T}UkS  
        Print "" )Y"+,$$>Y`  
        Print "Sample name: " & Chr(9) & sampName `sn^ysp  
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        'Open an output file and write the FRED header data 5IE#\FITO|  
        Dim outFile As String Ayxkv)%:@)  
        outFile = cDir & sampName & "_FRED.txt" *\ R ]NV  
        Open outFile For Output As #1 !2%HhiB'   
        Print #1, "type bsdf_data" 0XE4<U   
        Print #1, "format angles=deg bsdf=value scale=1" Te"ioU?.  
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        'Loop the file list, skip the two header lines and write the remaining data to file bCRV\myd`  
        Dim lineArray() As String, curLine As Long :D~DU,e'  
        For Each curFile In fList KcWN,!G  
            Print "Merging data from file " & curFile Va"0>KX  
            ReadFile( cDir & curFile, lineArray ) d; boIP`M;  
            For curLine = 2 To UBound(lineArray) TM%| '^)  
                Print #1, lineArray(curLine) */`ki;\A  
            Next (C\]-E>  
        Next ]_f_w 9]  
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        'Close the output file &."iFe  
        Close #1 P3x8UR=fS  
    wr$("A(  
        Print "Finished merging RPC data for sample " & sampName ?:Uv[|S#>  
        Print "FRED formatted data file: " & Chr(9) & outFile 3l rT3a3vV  
    End Sub 'j#*6xD  
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    'Utility function to read the contents of a file into an array of strings. "g5^_UP  
    Function ReadFile(ByVal fileName As String, _ 9+Np4i@  
                      ByRef lineArray() As String) As Long fDv2JdiU  
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        ReadFile = -1 }T(D7|^R  
        Dim oFSO As Object <sb~ ^B  
        Set oFSO = CreateObject("Scripting.FileSystemObject") L>jY.d2w=K  
        Erase lineArray K@ I 9^b  
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        Dim fid As Long '$i: 2mn,  
        If oFSO.fileexists( fileName ) Then BtkOnbz8X  
            fid = FreeFile() Ua:}Vn&!  
            Open fileName For Input As fid KLST\ Ln:  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) r8`ffH  
            Close fid g];!&R-  
        End If p $S*dr  
        Set oFSO = Nothing ER%^!xA  
        Return UBound( lineArray ) ~[t[y~Hup  
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    End Function x]}^v#  
    ` 'DmDg  
    Sub GetFileList( ByVal in_dir As String, _ KjD/o?JUr  
                     ByRef in_flist() As String ) T$8)u'-pa  
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        'Redimension the file list array =Qy<GeY  
        Erase in_flist j`{?OYD  
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        'Tracks how many files are found T^zXt?  
        Dim fCount As Long ju8> :y8  
        fCount = 0 wW Lj?;bx  
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        'Recurse directory and search for text files \[;0 KV_  
        Dim f As String /ixp&Z|7  
        f = Dir$(in_dir & "*.txt") ^ gdaa>L  
        While f <> "" 0Um2DjTCG  
            ReDim Preserve in_flist(fCount) ^}RCoE  
            in_flist(fCount) = f /T"+KU*  
            fCount += 1 z<MsKD0Q  
            f = Dir$() p?02C# p  
        Wend lov!o: dJ  
        ReDim Preserve in_flist(fCount-1) $zUP?Gq!  
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    End Sub f[]dfLS"W  
     
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