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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 ';V+~pi  
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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 ~q>ilnL"h  
    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。 uV:;y}T^Z  
    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|2C>{8  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Agf!6kh  
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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。 U.x.gZRo[  
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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) (*gpa:Sc  
    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 m %3Kq%?O  
    例如下所示: F,:VL*.5kJ  
    Sample name:  EDF-C1-56 ]x\wP7x  
    Merging data from file EDF-C1-56 0-0.txt ?g.w%Mf*  
    Finished merging RPC data for sample EDF-C1-56 _ji%BwJ  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt wH<*  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 jT0fF  
    a. 创建一个新的散射库 ZQ/5]]}3y  
    b. 散射模型命名 ']D( ({%g  
    c. 改变散射模型为“Tabulated BSDF”. lU& IS?^?  
    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 ) jL1UPN  
    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。 fok#D>q  
    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 /#5ZP\e  
    g. 点击OK p(>'4#|qy  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 jnY4(B   
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    脚本代码 CcQ|0  
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    '#Language "WWB-COM" E~Nr4vq  
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    Option Explicit k,& QcYw  
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    Sub Main v/dcb%  
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        'Cleanup tWuQKN`_  
        ClearOutputWindow() =t2epIr 5  
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        Print "Merging RPC Photonics BSDF Data Files" hZy*E[i  
        SetTextColor(255,0,0) |99eDgK,  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." #s%$kYp 1  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." x uF_^  
        SetTextColor(0,0,0) .v{ty  
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        'Current directory of this script (should be the same as the text files being merged) iatQHn >(  
        Dim cDir As String pppbn]%Ob  
        cDir = MacroDir$ & "\"  o~B=[  
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        'Array which will be populated with the list of files to be merged $fKWB5p|()  
        Dim fList() As String, curFile As String wSDDejg  
        GetFileList( cDir, fList ) _U %B1s3y  
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        Print "" Cpl)byb  
        Print "Files found for merging:" "P~>AXcq  
        For Each curFile In fList joq ;N]S  
            Print Chr(9) & curFile y-YYDEl  
        Next IkkrnG8  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ~n?U{ RmH  
        Dim nameArray() As String, sampName As String u CXd% CzE  
        nameArray = Split(fList(0)," 0-0.txt") tH(Z9\L7  
        sampName  = nameArray(0) A}8U;<\Ig  
        Print "" bc-"If Z&  
        Print "Sample name: " & Chr(9) & sampName u|E,Wy1  
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        'Open an output file and write the FRED header data %{Gqhb=u\  
        Dim outFile As String X'Oo ogu  
        outFile = cDir & sampName & "_FRED.txt" @gd-lcMYW  
        Open outFile For Output As #1 @47TDCr  
        Print #1, "type bsdf_data" 7^1ikmYY  
        Print #1, "format angles=deg bsdf=value scale=1" ts ] +W!:  
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        'Loop the file list, skip the two header lines and write the remaining data to file #AHIlUH"m  
        Dim lineArray() As String, curLine As Long tB[K4GNSQ  
        For Each curFile In fList r?$\`,;  
            Print "Merging data from file " & curFile |kn}iA@72p  
            ReadFile( cDir & curFile, lineArray ) ;8!D8o(+  
            For curLine = 2 To UBound(lineArray) <mxUgU  
                Print #1, lineArray(curLine) _Uq'eZol  
            Next P VPwYmte  
        Next C/XOI >  
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        'Close the output file z9gZ/d   
        Close #1 5g=" #  
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        Print "Finished merging RPC data for sample " & sampName wFe</U-';  
        Print "FRED formatted data file: " & Chr(9) & outFile m$kmoY/  
    End Sub WrV|<%EQh  
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    'Utility function to read the contents of a file into an array of strings. 0 [s1!Cm!i  
    Function ReadFile(ByVal fileName As String, _ +1rJ;G  
                      ByRef lineArray() As String) As Long g$+3IVq&  
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        ReadFile = -1 (mzyA%;W  
        Dim oFSO As Object /w|YNDA]j  
        Set oFSO = CreateObject("Scripting.FileSystemObject") *]rV,\z:  
        Erase lineArray !"wIb.j }0  
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        Dim fid As Long 3cnsJV]  
        If oFSO.fileexists( fileName ) Then TnC'<zm9 !  
            fid = FreeFile() hAY_dM  
            Open fileName For Input As fid N7NK1<vw2  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) v K$W)(Z  
            Close fid d"V^^I)yx&  
        End If u`ZnxD>  
        Set oFSO = Nothing WA<~M) rb  
        Return UBound( lineArray ) %T&kK2d;  
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    End Function % $J^dF_0  
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    Sub GetFileList( ByVal in_dir As String, _ jWm<!< ~  
                     ByRef in_flist() As String ) p4/D%*G^`  
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        'Redimension the file list array J[^-k!9M  
        Erase in_flist O)hNHIF  
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        'Tracks how many files are found [[Z*n/tr  
        Dim fCount As Long wy7f7zIa  
        fCount = 0 i6[Hu8  
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        'Recurse directory and search for text files /u?^s "C/  
        Dim f As String + 5 05  
        f = Dir$(in_dir & "*.txt") kw!! 5U;7  
        While f <> ""  G=wJz  
            ReDim Preserve in_flist(fCount) x]F:~(P  
            in_flist(fCount) = f #zfBNkk&@  
            fCount += 1 d !>PqPo  
            f = Dir$() q$\KE4v"  
        Wend ZM\Z2L]n  
        ReDim Preserve in_flist(fCount-1) XXO   
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    End Sub +"Ka #Z  
     
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