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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 正序阅读 楼主  发表于: 2020-12-15
    摘要 LLV:E{`p  
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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 !J'BAq[x  
    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。 D0tI  
    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。 c00a;=ji  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 #L[Atx  
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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。 </Q<*@p?  
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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) s#-`,jqD  
    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 !V#(g./W  
    例如下所示: c?j/ H$  
    Sample name:  EDF-C1-56 +-K-CXt  
    Merging data from file EDF-C1-56 0-0.txt n1!0KOu/N  
    Finished merging RPC data for sample EDF-C1-56 /oE@F178  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt )0~zL} )?  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 jQ(qaX&  
    a. 创建一个新的散射库 ,7z.%g3+z  
    b. 散射模型命名 op/|&H'  
    c. 改变散射模型为“Tabulated BSDF”. U''/y\Z  
    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 ) E<D45C{DP  
    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。 45q-x_  
    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 h@@2vs2  
    g. 点击OK QUwSnotgU  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Z^>{bW  
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    脚本代码 DXsp 2  
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    '#Language "WWB-COM" UuzT*Y>  
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    Option Explicit `o)rAD^e  
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    Sub Main 5@F1E8T  
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        'Cleanup >5'C<jc C  
        ClearOutputWindow() 4&&((H  
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        Print "Merging RPC Photonics BSDF Data Files" 'UUIY$V[  
        SetTextColor(255,0,0) "+~La{ POc  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 2dFC{US'  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." N/4`afiV.  
        SetTextColor(0,0,0) M]vc W  
    4'RyD<K\  
        'Current directory of this script (should be the same as the text files being merged) XcAx@CY9c  
        Dim cDir As String #kR8v[Z  
        cDir = MacroDir$ & "\" ncuqo'r  
    i<m1^a#C'  
        'Array which will be populated with the list of files to be merged a;r,*zZ="  
        Dim fList() As String, curFile As String j;WZ[g#t  
        GetFileList( cDir, fList ) [z'PdYQR/{  
    " ;8H;U`  
        Print "" |$f.Qs~?  
        Print "Files found for merging:" >ZTRwy`_(  
        For Each curFile In fList &Egw94l  
            Print Chr(9) & curFile q@1b{q#C5  
        Next ]4^9Tw6 _b  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Y`eUWCD  
        Dim nameArray() As String, sampName As String ABuK`(f.  
        nameArray = Split(fList(0)," 0-0.txt") :70[zo7n'  
        sampName  = nameArray(0) ANR?An  
        Print "" :D|"hJ  
        Print "Sample name: " & Chr(9) & sampName 8eCC =Az:  
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        'Open an output file and write the FRED header data w~{NN K;"j  
        Dim outFile As String F%Oy4*4  
        outFile = cDir & sampName & "_FRED.txt" i|?EgGFG  
        Open outFile For Output As #1 X0wvOs:  
        Print #1, "type bsdf_data" pN|BtrN{  
        Print #1, "format angles=deg bsdf=value scale=1" 7:awUoV8f  
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        'Loop the file list, skip the two header lines and write the remaining data to file D"UCe7  
        Dim lineArray() As String, curLine As Long &Azfpv   
        For Each curFile In fList tbG^9d  
            Print "Merging data from file " & curFile wK>a&`<  
            ReadFile( cDir & curFile, lineArray ) C^oj/} ^  
            For curLine = 2 To UBound(lineArray) Osz:23(p  
                Print #1, lineArray(curLine) 0' j/ 9vm  
            Next )(V|d$n  
        Next P_6JweN  
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        'Close the output file j N":9+F  
        Close #1 hA 1_zKZ  
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        Print "Finished merging RPC data for sample " & sampName b/"&E'5-`\  
        Print "FRED formatted data file: " & Chr(9) & outFile Y<0}z>^  
    End Sub jiw5>RNt  
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    'Utility function to read the contents of a file into an array of strings. X0G6W p  
    Function ReadFile(ByVal fileName As String, _ Lmh4ezrdH  
                      ByRef lineArray() As String) As Long ( $s%5|  
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        ReadFile = -1 d rRi<7 i  
        Dim oFSO As Object p6P .I8g  
        Set oFSO = CreateObject("Scripting.FileSystemObject") xb8S)zO]Q  
        Erase lineArray '$nm~z,V  
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        Dim fid As Long qrdA4S  
        If oFSO.fileexists( fileName ) Then 8);G'7O  
            fid = FreeFile() GS_+KR\  
            Open fileName For Input As fid E^'f'\m  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) R(.5Hs  
            Close fid f)'m pp^  
        End If ^/c v8M=  
        Set oFSO = Nothing <yNu/B.M  
        Return UBound( lineArray ) *n]f)Jc  
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    End Function ^UJB%l  
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    Sub GetFileList( ByVal in_dir As String, _  Q6qIx=c4  
                     ByRef in_flist() As String ) B=!&rKF  
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        'Redimension the file list array ]]"O)tWHj  
        Erase in_flist ?F=^& v8  
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        'Tracks how many files are found SHcFnxEAIH  
        Dim fCount As Long STln_'DF'  
        fCount = 0 Sao4MkSz[]  
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        'Recurse directory and search for text files t,P_&0X  
        Dim f As String ZsnFuk#W  
        f = Dir$(in_dir & "*.txt") 9I1D'7wI^^  
        While f <> "" Po B-:G6  
            ReDim Preserve in_flist(fCount) (D5sJ$&E@\  
            in_flist(fCount) = f AT{rg/oSf  
            fCount += 1 uT :Yh6  
            f = Dir$() O-uno{Fd*  
        Wend !vfbgK  
        ReDim Preserve in_flist(fCount-1) <y`M Upf]  
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    End Sub Q%T[&A}3B  
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