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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 1<UQJw45  
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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 4j5 "{  
    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。 7_,X9^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。 eNX-2S  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Rx.0P6s  
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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。 ]M/w];:  
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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) DWG}}vN:&  
    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 4kiu*T  
    例如下所示: rcOmpgew  
    Sample name:  EDF-C1-56 I5mS!m/X  
    Merging data from file EDF-C1-56 0-0.txt tx.sUu6  
    Finished merging RPC data for sample EDF-C1-56 Ue7~rPdlR  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt pH%K4bV)8  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 N*#SY$!y  
    a. 创建一个新的散射库 i \~4W$4I  
    b. 散射模型命名 827N?pU$)  
    c. 改变散射模型为“Tabulated BSDF”. _F9 c.BH  
    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 ) : SNp"|  
    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。 z3,z&Ra  
    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 4{V=X3,x  
    g. 点击OK /dAIg1ra  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 @({65gJ*  
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    脚本代码 > 01k u  
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    '#Language "WWB-COM" :3k(=^%G!  
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    Option Explicit kF ?\p`[a  
    AbB%osz}Ed  
    Sub Main /CP1mn6H  
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        'Cleanup F n\)*; ^  
        ClearOutputWindow() u}$?r\H'(  
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        Print "Merging RPC Photonics BSDF Data Files" +Fk.B@KT,  
        SetTextColor(255,0,0) 6gv.n  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." F=cO=5Iz  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 6i%)'dl  
        SetTextColor(0,0,0) Kxg09\5i  
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        'Current directory of this script (should be the same as the text files being merged) P _9O8"W  
        Dim cDir As String 'uh6?2)wG  
        cDir = MacroDir$ & "\" 1.+MX(w  
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        'Array which will be populated with the list of files to be merged #8'%CUF*<8  
        Dim fList() As String, curFile As String a 3H S!/  
        GetFileList( cDir, fList ) B|8(}Ciqx  
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        Print "" b[$>HB_Na  
        Print "Files found for merging:" h' 16"j>  
        For Each curFile In fList K jLj  
            Print Chr(9) & curFile "ey~w=B$M  
        Next IgVxWh#  
     #/n\C  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Cu}Rq!9i  
        Dim nameArray() As String, sampName As String M$w^g8F27H  
        nameArray = Split(fList(0)," 0-0.txt") 8g<3J-7Mm  
        sampName  = nameArray(0) RAe:$Iv$!v  
        Print "" ,+2ytN*  
        Print "Sample name: " & Chr(9) & sampName Lm8 cY  
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        'Open an output file and write the FRED header data bH&[O`vf  
        Dim outFile As String >8ePx,+!  
        outFile = cDir & sampName & "_FRED.txt" hNQ,U{`;^  
        Open outFile For Output As #1 oYu5]ry  
        Print #1, "type bsdf_data" b.$Gc!g  
        Print #1, "format angles=deg bsdf=value scale=1" MVV<&jho{^  
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        'Loop the file list, skip the two header lines and write the remaining data to file xD1w#FMlQs  
        Dim lineArray() As String, curLine As Long u ; I5n  
        For Each curFile In fList &D/_@\ 0  
            Print "Merging data from file " & curFile hd\iW7  
            ReadFile( cDir & curFile, lineArray ) vQA: \!  
            For curLine = 2 To UBound(lineArray) )4j#gHN\  
                Print #1, lineArray(curLine) mI}'8 .  
            Next WO]dWO6Mm  
        Next $AoN,B>  
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        'Close the output file gCd9"n-e  
        Close #1 GMFp,Df  
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        Print "Finished merging RPC data for sample " & sampName TzVNZDQ`Jl  
        Print "FRED formatted data file: " & Chr(9) & outFile ndN 8eh:OR  
    End Sub UeE&rA]  
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    'Utility function to read the contents of a file into an array of strings. zL1H[}[z+  
    Function ReadFile(ByVal fileName As String, _ f ^z7K  
                      ByRef lineArray() As String) As Long O0wD"V^W  
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        ReadFile = -1 yt$V<8a  
        Dim oFSO As Object k pEES{f  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Aj-}G^>#  
        Erase lineArray X=-pNwO   
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        Dim fid As Long +,If|5>(  
        If oFSO.fileexists( fileName ) Then 'H:lR1(,  
            fid = FreeFile() Z?X ^7<  
            Open fileName For Input As fid wOINcEdx  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) K" Y,K  
            Close fid xj(&EGY:  
        End If &%rX RP  
        Set oFSO = Nothing +\SbrB P  
        Return UBound( lineArray ) T5o9pm D  
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    End Function 6dV92:  
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    Sub GetFileList( ByVal in_dir As String, _ cvi+AZ=  
                     ByRef in_flist() As String ) |0BmEF  
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        'Redimension the file list array Qr$ uFh/y  
        Erase in_flist HX?5O$<<N  
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        'Tracks how many files are found 3%>"|Ye}A  
        Dim fCount As Long 76(&O  
        fCount = 0 yin"+&<T  
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        'Recurse directory and search for text files  ]Ocf %(  
        Dim f As String <5G*#0gw  
        f = Dir$(in_dir & "*.txt") @zW'!Ol  
        While f <> "" n"$D/XJO  
            ReDim Preserve in_flist(fCount) ,@8>=rT  
            in_flist(fCount) = f f?[IwA`  
            fCount += 1 ZmUS}   
            f = Dir$() 9["yL{IPe  
        Wend E XEae ?  
        ReDim Preserve in_flist(fCount-1) {])F%Q_#cD  
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    End Sub aa8WRf  
     
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