切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 897阅读
    • 0回复

    [技术]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    6421
    光币
    26250
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 o]vU(j_Ju  
     ou[_ y  
    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。
    8>sToNRNe  
    ^KsiTVY  
    背景 Jc:gNQCsP  
    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。 @I '_  
    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。 @pKQ}?  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    !a[1rQH  
    _=.f+1W  
    nD$CY K  
    步骤 ?r,lgaw  
    `<C/-Au  
    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 \HzI*|*A  
    uW8LG\Z>D5  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    0O,l rF0'  
    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) U&D"fM8  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 7O)U(<70  
    例如下所示: P"<HxT?  
    Sample name:  EDF-C1-56 Ba\l`$%X  
    Merging data from file EDF-C1-56 0-0.txt tCk;tu!d  
    Finished merging RPC data for sample EDF-C1-56 x_JCH7-  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt hoc$aqP6pp  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 }D7q)_g=  
    a. 创建一个新的散射库 >!OD[9  
    b. 散射模型命名 tBp146`  
    c. 改变散射模型为“Tabulated BSDF”. }wh)I]]U  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Xw=>L#Q  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 R^.oM1qu|  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 |8$x  
    g. 点击OK n0T\dc~  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 E0<9NF Qr7  
    S3[rv  
    %r0yBK2uOp  
    脚本代码 ag-\(i;K]  
    LsnM5GU7  
    '#Language "WWB-COM" 0@yHT-Dy  
    [lqwzW{(UN  
    Option Explicit ^1vh5D  
    c]>s(/}T  
    Sub Main 9=j"kXFf  
    S=>54!{`x  
        'Cleanup ;[]{O5TB  
        ClearOutputWindow() Y. ]FVq  
    y#:_K(A" k  
        Print "Merging RPC Photonics BSDF Data Files" !_VKJZuH  
        SetTextColor(255,0,0) ysV0Ed  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." x1\,WOrmK  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." [lpzUB}<Yp  
        SetTextColor(0,0,0) =h?WT*  
    OAMsqeWYA  
        'Current directory of this script (should be the same as the text files being merged) nk,X6o9%  
        Dim cDir As String ]A:n]mL  
        cDir = MacroDir$ & "\" bb# F2r4  
    8,pnm  
        'Array which will be populated with the list of files to be merged oZxC.;xJ  
        Dim fList() As String, curFile As String {(@M0?  
        GetFileList( cDir, fList ) .(OFYK<  
    c(. 2D  
        Print "" c rPEr  
        Print "Files found for merging:" 66*/"dBwm  
        For Each curFile In fList gnW `|-:\  
            Print Chr(9) & curFile b-8{bP]n  
        Next 4=S.U`t7  
    Y]aVa2!Wb  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. WG8}}`F|  
        Dim nameArray() As String, sampName As String %|$h<~  
        nameArray = Split(fList(0)," 0-0.txt") ~ztsR;iL  
        sampName  = nameArray(0) m$ZPQ0X  
        Print "" f"zXiUV  
        Print "Sample name: " & Chr(9) & sampName *2ZX*w37  
    sK8=PZ \  
        'Open an output file and write the FRED header data >M{=qs  
        Dim outFile As String n`Pwo &  
        outFile = cDir & sampName & "_FRED.txt" )$XW~oA'  
        Open outFile For Output As #1 `0Y`]kSY+  
        Print #1, "type bsdf_data" :DTKZ9>2D  
        Print #1, "format angles=deg bsdf=value scale=1" 7U> Xi'?  
    DT`TA#O  
        'Loop the file list, skip the two header lines and write the remaining data to file )?#*GMWU  
        Dim lineArray() As String, curLine As Long F!*u}8/_!  
        For Each curFile In fList {.=089`{  
            Print "Merging data from file " & curFile a>x3UVf_  
            ReadFile( cDir & curFile, lineArray ) K' xN>qc  
            For curLine = 2 To UBound(lineArray) xT7JGQ[|  
                Print #1, lineArray(curLine)  n4;  
            Next Q>R jv.1  
        Next G+2!+N\P  
    kH'LG!O  
        'Close the output file (- `h8M  
        Close #1 A)9OkLrc  
    r(;sX  
        Print "Finished merging RPC data for sample " & sampName f%fD>a  
        Print "FRED formatted data file: " & Chr(9) & outFile fYrC;&n  
    End Sub #zflU99d  
    wVU.j$+_#  
    'Utility function to read the contents of a file into an array of strings. c++GnQc.  
    Function ReadFile(ByVal fileName As String, _ %5#ts/f  
                      ByRef lineArray() As String) As Long 'B dZN  
    w U".^ +  
        ReadFile = -1 hTZ&  
        Dim oFSO As Object jFbj)!;  
        Set oFSO = CreateObject("Scripting.FileSystemObject") W^{zlg  
        Erase lineArray XpWcf ([  
    dm8N;r/w  
        Dim fid As Long q<.m@q  
        If oFSO.fileexists( fileName ) Then L?_'OwaY  
            fid = FreeFile() O@*^2, 6  
            Open fileName For Input As fid WWf#in  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) T1,Nb>gBq^  
            Close fid P2la/jN  
        End If h9<*+T  
        Set oFSO = Nothing M)sM G C  
        Return UBound( lineArray ) 9e5XS\  
    PkM]jbLe8  
    End Function I'6 wh+  
    L=g(w$H  
    Sub GetFileList( ByVal in_dir As String, _ t&5N{C:  
                     ByRef in_flist() As String ) {A<pb{<u  
    Ruy qB>[o  
        'Redimension the file list array 'cp1I&>  
        Erase in_flist VcI'+IoR?  
    "[A]tklP  
        'Tracks how many files are found $K& #R-  
        Dim fCount As Long s{g^K#BoFi  
        fCount = 0 B^|^hZZ>  
    TS2zzYE6Z  
        'Recurse directory and search for text files d\c?sYLv  
        Dim f As String b&wyp@k  
        f = Dir$(in_dir & "*.txt") $2!|e,x  
        While f <> "" t UOqF  
            ReDim Preserve in_flist(fCount) 'Cr2& dy  
            in_flist(fCount) = f M3m)uiz  
            fCount += 1 h"#[{$(  
            f = Dir$() {X r|L  
        Wend Dk ^,iY(u  
        ReDim Preserve in_flist(fCount-1) oU|yBs1  
    O+f'Ql  
    End Sub 79HKfG2+KB  
     
    分享到