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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  "3/&<0k  
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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 rFaG-R  
    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。 \/ ipYc  
    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。 H$.K   
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 8N \<o7t%  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 inh J|pe"  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) [iZH[7&j  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 4:5M,p  
    例如下所示: m`}mbm^  
    Sample name:  EDF-C1-56  1D_&n@  
    Merging data from file EDF-C1-56 0-0.txt Cz &3=),G  
    Finished merging RPC data for sample EDF-C1-56 Ft38)T"2R\  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt [:uHe#L  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Ec@cW6g(%  
    a. 创建一个新的散射库 %%N T m  
    b. 散射模型命名 F?[1 m2  
    c. 改变散射模型为“Tabulated BSDF”. L9-Jwy2(>  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) [S1 b\f#  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 c0Pj})-  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 f;AI4:#I  
    g. 点击OK YmOj.Q&  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 fvk(eWB  
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    脚本代码 "=1gA~T  
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    '#Language "WWB-COM" (cyvE}g  
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    Option Explicit L^*f$Balz  
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    Sub Main 1\~I "$}  
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        'Cleanup &>]U c%JK  
        ClearOutputWindow()  JJmW%%]i  
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        Print "Merging RPC Photonics BSDF Data Files" T*%rhnTv0  
        SetTextColor(255,0,0) <bb!BS&w  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." TgaxZW  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." H6{Bx2J1*  
        SetTextColor(0,0,0) bX$1PY X  
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        'Current directory of this script (should be the same as the text files being merged) qS9<_if2  
        Dim cDir As String z~3GgR"1d  
        cDir = MacroDir$ & "\" J]#rh5um  
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        'Array which will be populated with the list of files to be merged m#8(l{3|  
        Dim fList() As String, curFile As String ar#73f  
        GetFileList( cDir, fList ) GcDA0%i  
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        Print "" Ar[|M 2|  
        Print "Files found for merging:" K1^7v}P  
        For Each curFile In fList T A0(U$ 4  
            Print Chr(9) & curFile /# ]eVD  
        Next ~ \<$H'  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. e4 ,SR(O>  
        Dim nameArray() As String, sampName As String !#:5^":;  
        nameArray = Split(fList(0)," 0-0.txt") :L@n(bu RN  
        sampName  = nameArray(0) !Ve0:$  
        Print "" \8=)X})  
        Print "Sample name: " & Chr(9) & sampName }8" |q3k  
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        'Open an output file and write the FRED header data NLK1IH#  
        Dim outFile As String i%[gNh  
        outFile = cDir & sampName & "_FRED.txt" |Y05 *!\P*  
        Open outFile For Output As #1 0&j90J$`  
        Print #1, "type bsdf_data" V:'F_/&X?  
        Print #1, "format angles=deg bsdf=value scale=1" a#"orc j  
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        'Loop the file list, skip the two header lines and write the remaining data to file JRw,${W  
        Dim lineArray() As String, curLine As Long {0w2K82  
        For Each curFile In fList :;.^r,QAI  
            Print "Merging data from file " & curFile `WN80d\)&  
            ReadFile( cDir & curFile, lineArray ) w2UEU5%  
            For curLine = 2 To UBound(lineArray) RrvC}9ar  
                Print #1, lineArray(curLine) \fUX_0k9,  
            Next Vx2/^MiXy  
        Next ((+XzV>  
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        'Close the output file l=p_  
        Close #1 JJ7A` ;  
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        Print "Finished merging RPC data for sample " & sampName P O 5Wi  
        Print "FRED formatted data file: " & Chr(9) & outFile vReX7  
    End Sub !5(DU~S*@S  
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    'Utility function to read the contents of a file into an array of strings. ]sqLGmUL  
    Function ReadFile(ByVal fileName As String, _ p|.5;)%|  
                      ByRef lineArray() As String) As Long 4qp|g'uXT  
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        ReadFile = -1 YB7n}r23  
        Dim oFSO As Object WM?-BIlT=  
        Set oFSO = CreateObject("Scripting.FileSystemObject") !e$ZOYe  
        Erase lineArray :Q>e54]'&  
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        Dim fid As Long k:Y\i]#yP  
        If oFSO.fileexists( fileName ) Then =~hb&  
            fid = FreeFile() ,\iHgsZ  
            Open fileName For Input As fid TLVsTM8 P  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) QF/_?Tm4  
            Close fid G |KA!q  
        End If i,r:R g~  
        Set oFSO = Nothing ` = O  
        Return UBound( lineArray ) BYXc 'K  
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    End Function  x)Bbo9J  
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    Sub GetFileList( ByVal in_dir As String, _ > v%.q]E6n  
                     ByRef in_flist() As String ) kEnGr6e  
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        'Redimension the file list array Kh\ 7%>K#  
        Erase in_flist uL^; i""  
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        'Tracks how many files are found B223W_0"o  
        Dim fCount As Long ^#<L!yo^  
        fCount = 0 &]o-ZZX  
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        'Recurse directory and search for text files 'Gl~P><e  
        Dim f As String W+!UVUpW  
        f = Dir$(in_dir & "*.txt") ]nUrE6  
        While f <> ""  C7ivA h  
            ReDim Preserve in_flist(fCount) {IJ;)<>&VE  
            in_flist(fCount) = f E+O{^C=  
            fCount += 1 'c7nh{F  
            f = Dir$() 8l5>t  
        Wend Pj <U|\-?  
        ReDim Preserve in_flist(fCount-1) uKP4ur@1  
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    End Sub 71R,R,  
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