切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 1657阅读
    • 0回复

    [分享]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    6374
    光币
    26015
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 iB|htH'T  
    /9=r.Vxh  
    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。
    K)9Rw2-AJ  
    THlQifA!  
    背景 l8khu)\n4R  
    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。 f92z/5%V  
    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。 Eq%f`Qg+1E  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    U:z5`z!  
    e#)NYcr6  
    Bf.iRh0Q5  
    步骤 snWe&-  
    1F_$[iIX]  
    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 fTso[r:F.  
    SpImd IpD  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    >(-A"jf  
    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) :..WL;gC  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 {-lpYD^k3  
    例如下所示: 'J$@~P  
    Sample name:  EDF-C1-56 v[2&0&!K#  
    Merging data from file EDF-C1-56 0-0.txt `8S3Y  
    Finished merging RPC data for sample EDF-C1-56 ZS%W/.?  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @mJ~?d95v  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 yM`u]p1  
    a. 创建一个新的散射库 Vm[F~2+HX  
    b. 散射模型命名 L+*:VP6WD  
    c. 改变散射模型为“Tabulated BSDF”. 8ok=&Gq4  
    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 ) OIJT~Z}  
    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。 KZTLIZxI-  
    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 #N"u 0  
    g. 点击OK 2n$Wey[  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 |Iwglb!k  
    4&=</ok6`0  
    uIbAlE  
    脚本代码 [_nOo`  
    E%DT;1  
    '#Language "WWB-COM" 9|lLce$  
     4=ovm[  
    Option Explicit -pIz-*  
    W7Y@]QMX  
    Sub Main y|)VNnWM  
    Aj|->Y  
        'Cleanup k qL.ZR  
        ClearOutputWindow() f9 \$,7F  
    x\U[5d   
        Print "Merging RPC Photonics BSDF Data Files" eZ+6U`^t  
        SetTextColor(255,0,0) pr,,E[  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." hHhDs>tB  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." pY@QR?F\  
        SetTextColor(0,0,0) k#zDY*kj  
    i6KB\W2  
        'Current directory of this script (should be the same as the text files being merged) p<{P#?4 g  
        Dim cDir As String [{Jo(X  
        cDir = MacroDir$ & "\" & W od  
    ^?Mp(o  
        'Array which will be populated with the list of files to be merged :09NZ !!  
        Dim fList() As String, curFile As String l'/`2Y1  
        GetFileList( cDir, fList ) vUVFW'-  
    _FYA? d}  
        Print "" `!/[9Y#Hp  
        Print "Files found for merging:" ~f(5l.  
        For Each curFile In fList In^mE(8YO  
            Print Chr(9) & curFile $TmEVC^ 0  
        Next v@soS1V!  
    T{k_3[{0o  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 2t9UJu4  
        Dim nameArray() As String, sampName As String w8w0:@0(  
        nameArray = Split(fList(0)," 0-0.txt") (0 H=f6N  
        sampName  = nameArray(0) S )rr  
        Print "" CYLab5A  
        Print "Sample name: " & Chr(9) & sampName [9${4=Kq  
    b9RHsr]V  
        'Open an output file and write the FRED header data vI I{i  
        Dim outFile As String &F uPd}F  
        outFile = cDir & sampName & "_FRED.txt" aL4^ po  
        Open outFile For Output As #1 D9[19,2r`  
        Print #1, "type bsdf_data" hNM8H  
        Print #1, "format angles=deg bsdf=value scale=1" n82tZpn  
    [M[<'+^*  
        'Loop the file list, skip the two header lines and write the remaining data to file ()IZ7#kL?  
        Dim lineArray() As String, curLine As Long -0d9,,c  
        For Each curFile In fList v?OVhV  
            Print "Merging data from file " & curFile pE&G]ZC  
            ReadFile( cDir & curFile, lineArray ) \Q|-Npw  
            For curLine = 2 To UBound(lineArray) 3e&+[j  
                Print #1, lineArray(curLine) `P;r[j"  
            Next RJ'[m~yl5X  
        Next B=TUZ)  
    ID2->J  
        'Close the output file @01.Pd   
        Close #1 Ks P2./N  
    T0tX%_6`  
        Print "Finished merging RPC data for sample " & sampName Ze~P6  
        Print "FRED formatted data file: " & Chr(9) & outFile d\JaYizp  
    End Sub i90X0b-A  
    C P}fxDW  
    'Utility function to read the contents of a file into an array of strings. =G:Krc8w@  
    Function ReadFile(ByVal fileName As String, _ N!(mM;1X)  
                      ByRef lineArray() As String) As Long G0UaE1n  
    6}TunR  
        ReadFile = -1 %NrH\v{7Q  
        Dim oFSO As Object \R<MQ# x  
        Set oFSO = CreateObject("Scripting.FileSystemObject") k9}8xpH  
        Erase lineArray k~8-E u1  
    N.JR($N$  
        Dim fid As Long ->b5"{t  
        If oFSO.fileexists( fileName ) Then k sv]  
            fid = FreeFile() Iw`tb N L[  
            Open fileName For Input As fid 6kH6"  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9fEe={ B+  
            Close fid ;#85 _/  
        End If d/7R}n^  
        Set oFSO = Nothing _u[tv,  
        Return UBound( lineArray ) FMVAXOO  
    >[;W ~*  
    End Function Ic2?1<IZA  
    +& B?f  
    Sub GetFileList( ByVal in_dir As String, _ [[ ie  
                     ByRef in_flist() As String ) CM_hN>%w[  
    jsN[Drra  
        'Redimension the file list array 8gP1]xD  
        Erase in_flist mKZzSd)p  
    W~ ~'  
        'Tracks how many files are found ]%E h"   
        Dim fCount As Long e]RzvWq  
        fCount = 0 Op%OQ14$  
    eM<N?9s  
        'Recurse directory and search for text files Y)1/f EM  
        Dim f As String \ASt&'E  
        f = Dir$(in_dir & "*.txt") GOc   
        While f <> "" ;;,7Jon2  
            ReDim Preserve in_flist(fCount) /TpTR-\I0  
            in_flist(fCount) = f <gF]9%2E  
            fCount += 1 vh a9,5_  
            f = Dir$() oV vA`}  
        Wend wb$uq/|  
        ReDim Preserve in_flist(fCount-1) CeYhn\m5K0  
    7l53&,s   
    End Sub PR@6=[|d  
    62sl6WWS3  
    (03/4*g_s  
    QQ:2987619807 [./FzlAs  
     
    分享到