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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 jJQfCOD$  
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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 !Kqj&y5  
    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。 Jj!tRZT  
    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。 soK_l|z:J  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 m`0{j1K  
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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。 R2f,a*>  
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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) 5fv6RQD  
    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 2*E<G|-F  
    例如下所示: rxA)&  
    Sample name:  EDF-C1-56 >(J!8*7  
    Merging data from file EDF-C1-56 0-0.txt 5 : >  
    Finished merging RPC data for sample EDF-C1-56 4B>|Wft{p]  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ttt&sW`  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 O3GaxM \x  
    a. 创建一个新的散射库 #Ih(2T i  
    b. 散射模型命名 g{{SY5qDj  
    c. 改变散射模型为“Tabulated BSDF”. nrhpI d  
    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 ) $\H46Ji  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 } /FM#Xh  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 f}d@G/L  
    g. 点击OK e.h:9` "*  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 b=go"sJ@>(  
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    脚本代码 GoXHVUyp  
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    '#Language "WWB-COM" j KK48S  
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    Option Explicit K|!)<6ZsG7  
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    Sub Main k{8N@&D  
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        'Cleanup `;hBO#(H0}  
        ClearOutputWindow() bsVOO9.4-  
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        Print "Merging RPC Photonics BSDF Data Files" rbWFq|(_  
        SetTextColor(255,0,0) ;^]F~x}  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." u^9,u/gj  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." yV`vu/3K  
        SetTextColor(0,0,0) *()#*0  
    #SOe &W5  
        'Current directory of this script (should be the same as the text files being merged) 9`b3=&i\  
        Dim cDir As String v<**GW]neD  
        cDir = MacroDir$ & "\" ea/6$f9^  
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        'Array which will be populated with the list of files to be merged %vzpp\t  
        Dim fList() As String, curFile As String D':A-E  
        GetFileList( cDir, fList ) U[u6UG  
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        Print "" )/w2]d/9  
        Print "Files found for merging:" umYdr'p!v  
        For Each curFile In fList ?Ci\3)u,P  
            Print Chr(9) & curFile To95WG7G  
        Next +!wc(N[(2  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. &bNj/n/  
        Dim nameArray() As String, sampName As String AmFHn  
        nameArray = Split(fList(0)," 0-0.txt") z'*>Tk8h  
        sampName  = nameArray(0) C2T,1=  
        Print "" U/X ^  
        Print "Sample name: " & Chr(9) & sampName p-_j0zv  
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        'Open an output file and write the FRED header data #t*c*o  
        Dim outFile As String Urr1 K)  
        outFile = cDir & sampName & "_FRED.txt" "~ 6B C  
        Open outFile For Output As #1 E&AR=yqk  
        Print #1, "type bsdf_data" "`wq:$R  
        Print #1, "format angles=deg bsdf=value scale=1" }K\_N]#6n  
    :4dili4|/  
        'Loop the file list, skip the two header lines and write the remaining data to file w6tY6bf}  
        Dim lineArray() As String, curLine As Long ubw ]}sfM#  
        For Each curFile In fList Z'~FZRF  
            Print "Merging data from file " & curFile |k0VJi  
            ReadFile( cDir & curFile, lineArray ) <dZ{E7l  
            For curLine = 2 To UBound(lineArray) sQ$FtKm6  
                Print #1, lineArray(curLine) uB?YJf .T@  
            Next 3h>Ji1vV  
        Next 6 9Cxh  
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        'Close the output file wKN9HT  
        Close #1 1vr/|RWW  
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        Print "Finished merging RPC data for sample " & sampName &W%TY:Da|  
        Print "FRED formatted data file: " & Chr(9) & outFile WF]:?WE%  
    End Sub 8~bPoWP  
    d>}%A ]  
    'Utility function to read the contents of a file into an array of strings. ,o`qB81  
    Function ReadFile(ByVal fileName As String, _ &nss[w$%C  
                      ByRef lineArray() As String) As Long -llujB%;,e  
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        ReadFile = -1 Lv"83$^S9  
        Dim oFSO As Object &*}S 0  
        Set oFSO = CreateObject("Scripting.FileSystemObject") F&\o1g-L  
        Erase lineArray 'nul{RE*  
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        Dim fid As Long f55Ev<oOa  
        If oFSO.fileexists( fileName ) Then 2;3q](d   
            fid = FreeFile() 7hc(]8eP  
            Open fileName For Input As fid We`axkC  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) a;(:iMCi  
            Close fid 5"sF#Y&  
        End If `i}\k  
        Set oFSO = Nothing wsARH>Vz  
        Return UBound( lineArray ) c:bB4ch}  
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    End Function e1#}/U  
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    Sub GetFileList( ByVal in_dir As String, _ SaNx;xgi  
                     ByRef in_flist() As String ) O =fT;&%.  
    /[IK [  
        'Redimension the file list array ^a]:GPc  
        Erase in_flist r&qD!l5y  
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        'Tracks how many files are found [x&&N*>N  
        Dim fCount As Long gyPF!"!5dq  
        fCount = 0 -vMP{,  
    yP@= x!$  
        'Recurse directory and search for text files _tjH=Ff$  
        Dim f As String /xmd]XM=_  
        f = Dir$(in_dir & "*.txt") o)$sZ{` ="  
        While f <> "" i|<*EXB"  
            ReDim Preserve in_flist(fCount) FvkKM+?F  
            in_flist(fCount) = f b`2~  
            fCount += 1 (GeJBw,Q  
            f = Dir$() &^}w|J?  
        Wend eRf 8'-"#-  
        ReDim Preserve in_flist(fCount-1)  j>6{PDaT  
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    End Sub TiOvrp7B  
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