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    [技术]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: 2023-05-11
    摘要 9x8Vsd  
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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 @[f$MRp\  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 Lp4F1H2t-  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 q"S,<I<f  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 BnDCK@+|Q  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 F!4V!VWA}  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 4gVIuF*pS  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 e"{"g[b/7  
    例如下所示: \I<R.4 9oW  
    Sample name:  EDF-C1-56 6R$Yh0%  
    Merging data from file EDF-C1-56 0-0.txt 28c6~*Te #  
    Finished merging RPC data for sample EDF-C1-56 &#gh :5  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt rKT.~ZP\  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 myqwU`s  
    a. 创建一个新的散射库 D:z_FNN  
    b. 散射模型命名 ]|=`-)AP3  
    c. 改变散射模型为“Tabulated BSDF”. t y4R2LnC  
    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 ) @t*D<B$  
    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。 5~im.XfiVx  
    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 gSj0+|  
    g. 点击OK &@BAVc z  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 EwuRIe;D  
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    脚本代码 ]:']  
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    '#Language "WWB-COM" M&gi$Qs[E  
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    Option Explicit gN7 3)uJ0  
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    Sub Main MA}}w&  
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        'Cleanup :O,r3O6  
        ClearOutputWindow() 6X?:mn'%QF  
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        Print "Merging RPC Photonics BSDF Data Files" >ke.ZZV?  
        SetTextColor(255,0,0) ]s E)-8  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." i: jB  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." FU J<gqL  
        SetTextColor(0,0,0) [F;\NJp6?^  
    "M\rO!f:  
        'Current directory of this script (should be the same as the text files being merged) F#RNm5  
        Dim cDir As String W,H=K##6<  
        cDir = MacroDir$ & "\" u?g&(h  
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        'Array which will be populated with the list of files to be merged :PY6J}:&#  
        Dim fList() As String, curFile As String ?,+&NX3m  
        GetFileList( cDir, fList ) so/0f1R?~  
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        Print "" +xsGa{`  
        Print "Files found for merging:" UIg?3J}R  
        For Each curFile In fList ~-uf%=  
            Print Chr(9) & curFile c#1kg@q@  
        Next 11Qi _T\  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Q-#<{' (  
        Dim nameArray() As String, sampName As String ;*9<lUvu  
        nameArray = Split(fList(0)," 0-0.txt") J7aYi]vI  
        sampName  = nameArray(0) 5JK'2J&  
        Print "" #Ufb  
        Print "Sample name: " & Chr(9) & sampName 9^`cVjD5  
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        'Open an output file and write the FRED header data kdx06'4o  
        Dim outFile As String `kv7Rr}Q  
        outFile = cDir & sampName & "_FRED.txt" l{ql'm  
        Open outFile For Output As #1 05\0g9  
        Print #1, "type bsdf_data" }u$c*}  
        Print #1, "format angles=deg bsdf=value scale=1" i+< v7?:`#  
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        'Loop the file list, skip the two header lines and write the remaining data to file [e@m -/B  
        Dim lineArray() As String, curLine As Long A{k1MA<F6  
        For Each curFile In fList 8;c\} D  
            Print "Merging data from file " & curFile O@W/s!&lFa  
            ReadFile( cDir & curFile, lineArray ) 6#K.n&=*  
            For curLine = 2 To UBound(lineArray) P>)J:.tr0  
                Print #1, lineArray(curLine) VAUd^6Xdwx  
            Next &2[Xu4*  
        Next #R31V QwK5  
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        'Close the output file 2EN}"Du]mj  
        Close #1 9(}d7y  
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        Print "Finished merging RPC data for sample " & sampName 9IrCu?n9b  
        Print "FRED formatted data file: " & Chr(9) & outFile gzH;`,  
    End Sub FwHqID_!:l  
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    'Utility function to read the contents of a file into an array of strings. hNkv lk'Ui  
    Function ReadFile(ByVal fileName As String, _ J kAd3ls  
                      ByRef lineArray() As String) As Long '@w'(}3!3R  
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        ReadFile = -1 <RbfW'<G  
        Dim oFSO As Object tlg}"lY  
        Set oFSO = CreateObject("Scripting.FileSystemObject") nhC8Tq[m  
        Erase lineArray MZcvr9y  
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        Dim fid As Long t0v >J9  
        If oFSO.fileexists( fileName ) Then #Dz"g_d  
            fid = FreeFile() t l7:L>  
            Open fileName For Input As fid _h,_HW)G  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) x%goyXK  
            Close fid %hZX XpuO  
        End If vdB2T2F  
        Set oFSO = Nothing (JnEso-V  
        Return UBound( lineArray ) }Y!s:w#  
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    End Function *icaKy3  
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    Sub GetFileList( ByVal in_dir As String, _ h"Wpb}FT  
                     ByRef in_flist() As String ) `'3 De(  
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        'Redimension the file list array w2/3[VZ}l  
        Erase in_flist fO^s4gWTg  
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        'Tracks how many files are found be]/ROP>H  
        Dim fCount As Long ~]?EV?T  
        fCount = 0 vkR ~nIp  
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        'Recurse directory and search for text files ,WnZ^R/n  
        Dim f As String fl9VokAT  
        f = Dir$(in_dir & "*.txt") upZc~k!1\  
        While f <> "" D8 PC;@m  
            ReDim Preserve in_flist(fCount) Bj><0 cNF  
            in_flist(fCount) = f O\Z!7UQ$  
            fCount += 1 ;!t?*  
            f = Dir$() &0|Z FXPd  
        Wend P_  8!Gp  
        ReDim Preserve in_flist(fCount-1) #D JZ42  
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    End Sub  Z,O-P9jC  
     
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