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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 正序阅读 楼主  发表于: 2020-12-15
    摘要 54{E&QvL8o  
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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 AclK9+V  
    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。 i^WY/ OhL  
    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。 ( x% 4*  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 R|@~<*  
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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。 g mWwlkf9  
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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) z,ryY'ua/I  
    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 }r18Y6  
    例如下所示: U8aVI  
    Sample name:  EDF-C1-56 1q=Q/L4P  
    Merging data from file EDF-C1-56 0-0.txt ;E{jn4B'  
    Finished merging RPC data for sample EDF-C1-56 cK[=IE5  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7oZPb  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 /0>'ZzjV,  
    a. 创建一个新的散射库 eSIG+{;&  
    b. 散射模型命名 %4` U' j  
    c. 改变散射模型为“Tabulated BSDF”. U6|T<bsOl  
    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 ) >/RFff]Fh0  
    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。 P cbhylKd  
    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 jD<xpD  
    g. 点击OK d<Lc&wlP  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 RU#}!Kq  
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    脚本代码 J e|   
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    '#Language "WWB-COM" C ]B P}MY<  
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    Option Explicit )Vy0V=  
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    Sub Main 4n.JRR&;  
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        'Cleanup 6n]jx:CZ,  
        ClearOutputWindow() Q "NZE  
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        Print "Merging RPC Photonics BSDF Data Files" QSzht$ 8  
        SetTextColor(255,0,0) h$sOJs~6h  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 2oc18#iG (  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." )sQ/$gJ  
        SetTextColor(0,0,0) Nk7=[y#z  
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        'Current directory of this script (should be the same as the text files being merged) C}uzzG6s  
        Dim cDir As String y(iq  
        cDir = MacroDir$ & "\" ,j{tGj_  
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        'Array which will be populated with the list of files to be merged DC_uh  
        Dim fList() As String, curFile As String &'zc2  
        GetFileList( cDir, fList ) rS!@AgPLE  
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        Print "" y4@gw.pt  
        Print "Files found for merging:" }M(xN6E  
        For Each curFile In fList 'aV'Am+:  
            Print Chr(9) & curFile ]Ue aXwaU  
        Next n(V{ [  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. c zT2f  
        Dim nameArray() As String, sampName As String ?vbAaRg50s  
        nameArray = Split(fList(0)," 0-0.txt") yaG:}=.3  
        sampName  = nameArray(0) ]zAwKuIK  
        Print "" jPo,mz&^  
        Print "Sample name: " & Chr(9) & sampName :J @3:+sr  
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        'Open an output file and write the FRED header data s8's(*]  
        Dim outFile As String h|PC?@jp  
        outFile = cDir & sampName & "_FRED.txt" w2s06`g  
        Open outFile For Output As #1 wC%qSy'  
        Print #1, "type bsdf_data" vw:GNpg'R6  
        Print #1, "format angles=deg bsdf=value scale=1" WC=d @d)M  
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        'Loop the file list, skip the two header lines and write the remaining data to file f34/whD65  
        Dim lineArray() As String, curLine As Long }%PK %/ zI  
        For Each curFile In fList J,?F+Qji&=  
            Print "Merging data from file " & curFile WK?5`|1l:x  
            ReadFile( cDir & curFile, lineArray ) nql9SQ'\\  
            For curLine = 2 To UBound(lineArray) .Mb0++% W  
                Print #1, lineArray(curLine) {9{X\|  
            Next /TPtPq<7:#  
        Next (_@]-   
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        'Close the output file p/nATvh$  
        Close #1 HnjA78%i  
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        Print "Finished merging RPC data for sample " & sampName #C.  
        Print "FRED formatted data file: " & Chr(9) & outFile ,W[J@4.  
    End Sub )qMbk7:v\  
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    'Utility function to read the contents of a file into an array of strings. } LC  
    Function ReadFile(ByVal fileName As String, _ ^$% Sg//  
                      ByRef lineArray() As String) As Long t_!p({  
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        ReadFile = -1 =+mb@#="m  
        Dim oFSO As Object >EFWevT{  
        Set oFSO = CreateObject("Scripting.FileSystemObject") $+n6V2^K)7  
        Erase lineArray /i27F2NQm  
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        Dim fid As Long ffR%@  
        If oFSO.fileexists( fileName ) Then <},JWV3  
            fid = FreeFile() LWTPNp:"{w  
            Open fileName For Input As fid >P@V D"U  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ^Y+C!I  
            Close fid @q>Hl`a  
        End If 6i+,/vr  
        Set oFSO = Nothing a9p:k ]{  
        Return UBound( lineArray ) ToPjB vD  
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    End Function 7p]Izx8][  
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    Sub GetFileList( ByVal in_dir As String, _ *5k40?w  
                     ByRef in_flist() As String ) 2YKa <?_  
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        'Redimension the file list array N2'aC} I  
        Erase in_flist mgVYKZWL-i  
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        'Tracks how many files are found F{a;=h#@Q  
        Dim fCount As Long TbNH{w|p  
        fCount = 0 X|Y(*$?D7  
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        'Recurse directory and search for text files hPNMp@Nm6  
        Dim f As String I-r+1gty  
        f = Dir$(in_dir & "*.txt") EmcLW74  
        While f <> "" :zKMw=  
            ReDim Preserve in_flist(fCount) rqmb<# Z  
            in_flist(fCount) = f r)}U 'iv*%  
            fCount += 1 X)~wB7_0G  
            f = Dir$() 'n,V*9  
        Wend "EMW'>&m  
        ReDim Preserve in_flist(fCount-1) RfTGTz@H  
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    End Sub CKK}Z;~:  
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