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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 UtW"U0A  
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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 K=!ZI/+ju  
    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。 a.Rp#}f  
    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。 HdY3DdC%q  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Sob $j  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 ZVL- o<6  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) )L(d$N=Bd  
    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 JucxhjV#,  
    例如下所示: =7J|KoKK  
    Sample name:  EDF-C1-56 Vav+$l|j@  
    Merging data from file EDF-C1-56 0-0.txt  f>wW}-  
    Finished merging RPC data for sample EDF-C1-56 7fN&Q~.  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt >DL-Q\U  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ?*z( 1!  
    a. 创建一个新的散射库 ;)= zvr17  
    b. 散射模型命名 ok\/5oz  
    c. 改变散射模型为“Tabulated BSDF”. _ \v@9Q\  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) vS J<  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 RBK>Lws6  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 -}N\REXE  
    g. 点击OK nuQLq^e  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 o+X'(!Trw  
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    脚本代码 d4/`:?w  
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    '#Language "WWB-COM" v_@#hf3  
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    Option Explicit 1 <qVN'[  
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    Sub Main *09\\ G  
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        'Cleanup vRb(eg  
        ClearOutputWindow() 'De'(I  
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        Print "Merging RPC Photonics BSDF Data Files" {HRxyAI!  
        SetTextColor(255,0,0) 6ImV5^l  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 8|jX ~f  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." l=-d K_ I?  
        SetTextColor(0,0,0) &PQ{e8w  
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        'Current directory of this script (should be the same as the text files being merged) :DX/r  
        Dim cDir As String qLW-3W;WUH  
        cDir = MacroDir$ & "\" ">D(+ xr!)  
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        'Array which will be populated with the list of files to be merged ,f /IG.  
        Dim fList() As String, curFile As String <>*''^  
        GetFileList( cDir, fList ) 1:{O RX[;  
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        Print "" _qzo):G.s  
        Print "Files found for merging:" qYu!:xa8  
        For Each curFile In fList 73sAZa|  
            Print Chr(9) & curFile =<FZ{4  
        Next A$"$`)P!  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. .&yWHdQC:  
        Dim nameArray() As String, sampName As String ubCJZ"!  
        nameArray = Split(fList(0)," 0-0.txt") rW%'M#! =  
        sampName  = nameArray(0) tSXjp  
        Print "" {}_Oo%IVGK  
        Print "Sample name: " & Chr(9) & sampName 98%tws`  
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        'Open an output file and write the FRED header data {8bY7NH|  
        Dim outFile As String HG3>RcB  
        outFile = cDir & sampName & "_FRED.txt" CD<u@l,1  
        Open outFile For Output As #1 ?e_}X3{  
        Print #1, "type bsdf_data" wPO@f~[Ji  
        Print #1, "format angles=deg bsdf=value scale=1" e/% ;  
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        'Loop the file list, skip the two header lines and write the remaining data to file VX>t!JP p  
        Dim lineArray() As String, curLine As Long (_n8$3T75  
        For Each curFile In fList cSs/XJZ  
            Print "Merging data from file " & curFile mlw BATi  
            ReadFile( cDir & curFile, lineArray )  B3+WOf5W  
            For curLine = 2 To UBound(lineArray) Z-p^3t'{  
                Print #1, lineArray(curLine) Lp]C![\>U  
            Next G-i_s6Wu  
        Next nPIR 1Z  
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        'Close the output file B)cb}.N:  
        Close #1 H=BR -  
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        Print "Finished merging RPC data for sample " & sampName 'nDT.i  
        Print "FRED formatted data file: " & Chr(9) & outFile 5sCk y)N  
    End Sub <@j  
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    'Utility function to read the contents of a file into an array of strings. F5Q. Vh  
    Function ReadFile(ByVal fileName As String, _ K$vRk5U  
                      ByRef lineArray() As String) As Long .p0n\ $r  
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        ReadFile = -1 [3NV #  
        Dim oFSO As Object L8K3&[l%  
        Set oFSO = CreateObject("Scripting.FileSystemObject") !skWe~/  
        Erase lineArray Sm_:SF!<D6  
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        Dim fid As Long E|uXi)!.x  
        If oFSO.fileexists( fileName ) Then b`Ek;nYek  
            fid = FreeFile() KIY_EE$?  
            Open fileName For Input As fid WIl S^?5I<  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ]G&\L~P  
            Close fid r$eL-jQmn  
        End If yWk:u 5  
        Set oFSO = Nothing 1;[ <||K  
        Return UBound( lineArray ) `/Jr8J_  
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    End Function M_ cb(=ey  
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    Sub GetFileList( ByVal in_dir As String, _ ^a5~FI:  
                     ByRef in_flist() As String ) e14 Q\  
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        'Redimension the file list array Z$K%@q,10+  
        Erase in_flist ;ypO'  
    W&[9x%Ba  
        'Tracks how many files are found c+XR  
        Dim fCount As Long }4`YdN  
        fCount = 0 g8@HAV^H  
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        'Recurse directory and search for text files ;.m[&h 0  
        Dim f As String HY#("=9< h  
        f = Dir$(in_dir & "*.txt") dM.Ow!j  
        While f <> "" r~a}B.pj  
            ReDim Preserve in_flist(fCount) ]>!_OCe&  
            in_flist(fCount) = f |8+rUFkU8  
            fCount += 1 b|'LtL$Y  
            f = Dir$() 52Ffle8  
        Wend OU=IV;V{  
        ReDim Preserve in_flist(fCount-1) n!orM5=:O  
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    End Sub TU6EE  
     
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