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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 W6Hiqu+  
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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  #/n\C  
    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。 {W0@lMrD  
    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。 9 eP @}C6  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ydpsPU?wj5  
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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。  @521 zi  
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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) IuPwFf)  
    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 k1X<jC]P  
    例如下所示: 3o6N&bQ b  
    Sample name:  EDF-C1-56 ~(}zp<e|  
    Merging data from file EDF-C1-56 0-0.txt En1pz\'  
    Finished merging RPC data for sample EDF-C1-56 *'Ch(c:rtH  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt bY#>   
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 -E.EI@"  
    a. 创建一个新的散射库 <.Pr+g  
    b. 散射模型命名 1<lLE1fk  
    c. 改变散射模型为“Tabulated BSDF”. J|s4c`=  
    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 ) 55Jk "V#8  
    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。 ^58'*13ZL  
    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 3dXyKi  
    g. 点击OK " 4s,a  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 m|'TPy  
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    脚本代码 BVG 3 T  
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    '#Language "WWB-COM" 9v^MZ ^Y{  
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    Option Explicit ;gf^;%FK  
    #qHo+M$"  
    Sub Main UAa2oY&  
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        'Cleanup o: TO[  
        ClearOutputWindow() Kx ';mgG#$  
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        Print "Merging RPC Photonics BSDF Data Files" a Z ^SK|E  
        SetTextColor(255,0,0) JIDE]f  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Yk[yG;W  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." n ,`!yw  
        SetTextColor(0,0,0) }*;Hhbox  
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        'Current directory of this script (should be the same as the text files being merged) g {wDI7"<q  
        Dim cDir As String tFXG4+$D  
        cDir = MacroDir$ & "\" l1a=r:WhH  
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        'Array which will be populated with the list of files to be merged (m})V0/`  
        Dim fList() As String, curFile As String bc%7-%  
        GetFileList( cDir, fList ) #BF(#1:  
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        Print "" vuA';,:~  
        Print "Files found for merging:" L Ktr>u  
        For Each curFile In fList dX` _Y  
            Print Chr(9) & curFile rJ K~kKG  
        Next 19h8p>Sx0  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. [p|-G*=00  
        Dim nameArray() As String, sampName As String DtR-NzjB  
        nameArray = Split(fList(0)," 0-0.txt") 's+ Fd~ '  
        sampName  = nameArray(0) :U^a0s%B  
        Print "" t: r   
        Print "Sample name: " & Chr(9) & sampName Lr_+) l  
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        'Open an output file and write the FRED header data qK#\k@E  
        Dim outFile As String c(i-~_  
        outFile = cDir & sampName & "_FRED.txt" O]90 F  
        Open outFile For Output As #1 UPA))Iv>  
        Print #1, "type bsdf_data" Y<I/y  
        Print #1, "format angles=deg bsdf=value scale=1" j'I$F1>Te  
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        'Loop the file list, skip the two header lines and write the remaining data to file ' w!o!_T6  
        Dim lineArray() As String, curLine As Long ZoF\1C ^  
        For Each curFile In fList =&< s*-l[  
            Print "Merging data from file " & curFile i` n,{{x&4  
            ReadFile( cDir & curFile, lineArray ) iE0A-;:5  
            For curLine = 2 To UBound(lineArray) +UB+. 5P  
                Print #1, lineArray(curLine) #Q"el3P+q  
            Next 5,|^4 ZA  
        Next /!uxP~2U  
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        'Close the output file :;#Kg_bz  
        Close #1 dq[j.Nmq  
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        Print "Finished merging RPC data for sample " & sampName s'J8E+&5  
        Print "FRED formatted data file: " & Chr(9) & outFile  \|L@  
    End Sub n(0O'nS^  
    'cu( Sd}  
    'Utility function to read the contents of a file into an array of strings.  3_+-t5  
    Function ReadFile(ByVal fileName As String, _ o'?Y0Wt  
                      ByRef lineArray() As String) As Long -H#{[M8xX  
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        ReadFile = -1 Nj@k|_1  
        Dim oFSO As Object ==l p\  
        Set oFSO = CreateObject("Scripting.FileSystemObject") cL7je  
        Erase lineArray uL1e?  
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        Dim fid As Long pdngM 8n  
        If oFSO.fileexists( fileName ) Then b(&2/|hd  
            fid = FreeFile() j_H{_Ug  
            Open fileName For Input As fid k^:$ETW2 D  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) *}$T:kTH  
            Close fid <}L`d(E@f  
        End If s0~a5Ti3  
        Set oFSO = Nothing k*\WzBTd  
        Return UBound( lineArray ) x@;XyQq  
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    End Function O&!+ni  
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    Sub GetFileList( ByVal in_dir As String, _ Hl8-1M$&  
                     ByRef in_flist() As String ) b54<1\&  
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        'Redimension the file list array s*>s;S?{|  
        Erase in_flist *RD9 gIze  
    [-x~Q[  
        'Tracks how many files are found P>+{}c}3I  
        Dim fCount As Long be|k"s|6)  
        fCount = 0 MS)#S&  
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        'Recurse directory and search for text files 47ppyh6@  
        Dim f As String S#8wnHq  
        f = Dir$(in_dir & "*.txt") ),(ejRP'r  
        While f <> "" MRwls@z=  
            ReDim Preserve in_flist(fCount) EW%%W6O6  
            in_flist(fCount) = f q.yS j  
            fCount += 1 VLQDktj&  
            f = Dir$() 3;zJ\a.+  
        Wend -v'7;L0K  
        ReDim Preserve in_flist(fCount-1) mL?9AxO  
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    End Sub 9x0B9&  
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