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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 2E^zQ>;01  
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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 {w.rcObIw+  
    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。 [)|P-x-<  
    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。 @2-Eky  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 E ~xK1x"  
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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。 s8 .OL_e  
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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) E_]L8UC;m  
    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 't \:@-tQ  
    例如下所示: wxpE5v+f|  
    Sample name:  EDF-C1-56 stz1e dP  
    Merging data from file EDF-C1-56 0-0.txt ,JyE7h2%i  
    Finished merging RPC data for sample EDF-C1-56 ?y!0QAIXK  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt J')Dt]/9  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 DYJ@>8  
    a. 创建一个新的散射库 E^_P  
    b. 散射模型命名 <#JJS}TLk  
    c. 改变散射模型为“Tabulated BSDF”. iy Zs:4jkc  
    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 ) $:w4_X5T  
    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。 9:CJl6~N)#  
    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 =YkJS%)M)  
    g. 点击OK "0Uh(9Fv  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 GEXT8f(7  
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    脚本代码 $}r*WZ  
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    '#Language "WWB-COM" Mh>H5l.1i  
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    Option Explicit #>dfP"}&,  
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    Sub Main "TA r\; [  
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        'Cleanup ;LNFPo   
        ClearOutputWindow() -8; ,#  
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        Print "Merging RPC Photonics BSDF Data Files" pXPwn(  
        SetTextColor(255,0,0) Urur/_]-%  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 7$'%*|C.  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." IwhZzw w  
        SetTextColor(0,0,0) n!~mdI&  
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        'Current directory of this script (should be the same as the text files being merged) &Al9%W  
        Dim cDir As String > tXn9'S  
        cDir = MacroDir$ & "\" c%c/mata?  
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        'Array which will be populated with the list of files to be merged He="S3XON  
        Dim fList() As String, curFile As String 1ux~dP  
        GetFileList( cDir, fList ) >K**SjVG  
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        Print "" EU.vw0}u8  
        Print "Files found for merging:" Z W` Ur>  
        For Each curFile In fList  `W< 7.  
            Print Chr(9) & curFile _XIls*6AK  
        Next p"f=[awp  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. mz;S*ONlV  
        Dim nameArray() As String, sampName As String uhvmh  
        nameArray = Split(fList(0)," 0-0.txt") \dSMF,E  
        sampName  = nameArray(0) ~fB}v  
        Print "" L {(\k$>'  
        Print "Sample name: " & Chr(9) & sampName |xy r6gY  
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        'Open an output file and write the FRED header data mz@`*^7?  
        Dim outFile As String XH&Fn+  
        outFile = cDir & sampName & "_FRED.txt" fBS`b[ x  
        Open outFile For Output As #1 '{WYho!  
        Print #1, "type bsdf_data" Y\luz`v  
        Print #1, "format angles=deg bsdf=value scale=1" de]r9$ D  
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        'Loop the file list, skip the two header lines and write the remaining data to file w V&{w7  
        Dim lineArray() As String, curLine As Long 9.ZhkvR4A  
        For Each curFile In fList wP3_RA]z  
            Print "Merging data from file " & curFile =\.Oc+p4  
            ReadFile( cDir & curFile, lineArray ) Cr|v3Y#h'  
            For curLine = 2 To UBound(lineArray) x;" !  
                Print #1, lineArray(curLine) peqoLeJI  
            Next aZ^P*|_K3  
        Next !U.Xb6  
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        'Close the output file o.U$\9MNP  
        Close #1 `"QUA G  
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        Print "Finished merging RPC data for sample " & sampName $by-?z((  
        Print "FRED formatted data file: " & Chr(9) & outFile D ODo !  
    End Sub 0.S].Y[  
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    'Utility function to read the contents of a file into an array of strings. d (]t}  
    Function ReadFile(ByVal fileName As String, _ .kh%66:  
                      ByRef lineArray() As String) As Long e:}8|e~T  
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        ReadFile = -1 JmdXh/X  
        Dim oFSO As Object 3?I^D /K^  
        Set oFSO = CreateObject("Scripting.FileSystemObject") GgkljF@{}  
        Erase lineArray <(W0N|1v  
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        Dim fid As Long g/,fjM_  
        If oFSO.fileexists( fileName ) Then >ijFQ667>j  
            fid = FreeFile() % INRds  
            Open fileName For Input As fid H6?ZE  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) :Z(?Ct&8  
            Close fid d!/@+i  
        End If mN3}wJ}J  
        Set oFSO = Nothing s mub> V  
        Return UBound( lineArray ) [o8a(oC  
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    End Function OD<0,r0f,  
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    Sub GetFileList( ByVal in_dir As String, _ 2%\Nq:; T  
                     ByRef in_flist() As String ) ZxkX\gl91  
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        'Redimension the file list array {H s" "/sb  
        Erase in_flist _.0c~\VA  
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        'Tracks how many files are found 4S|! iOY  
        Dim fCount As Long *0M#{HQ  
        fCount = 0 VpSk.WY/ e  
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        'Recurse directory and search for text files QxvxeK!Y  
        Dim f As String TuY{c%qQ:  
        f = Dir$(in_dir & "*.txt") Y'"2s~_ Z  
        While f <> "" zMb7a_W  
            ReDim Preserve in_flist(fCount) )%%RI_J T  
            in_flist(fCount) = f ;`g\Tu  
            fCount += 1 , RfU1R  
            f = Dir$() a%f{mP$m  
        Wend >R3~P~@30  
        ReDim Preserve in_flist(fCount-1) Qfo'w%px  
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    End Sub pW O-YZ#+  
     
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