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infotek 2021-10-26 09:58

RPC Photonics扩散片BSDF

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RPC Photonics扩散片BSDF
时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印
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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。 |YQ:4'^"  
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背景 EpCUL@+  
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。 x 1$tS#lS  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 #:3E.=  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Bj J$I^  
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) ~/h P6*  
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 \sF}NBNT@  
例如下所示: @B~/0 9  
Sample name:  EDF-C1-56 w'.ny<Pe  
Merging data from file EDF-C1-56 0-0.txt !o&Mw:d  
Finished merging RPC data for sample EDF-C1-56 d;(L@9HHD  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt *Rj>// A  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 Zi2NgVF  
b. 散射模型命名 QKbX^C  
c. 改变散射模型为“Tabulated BSDF”. aIZ@5w"7  
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 ) ^&DHBx"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。 NwuME/C7#  
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, Om{[ <tL  
g. 点击OK Ps.O.2Z5ZB  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 W9Bl'e  
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脚本代码 z(3mhMJY  
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'#Language "WWB-COM" sN 7I~  
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Option Explicit Y 1Bj++?2  
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Sub Main )AqM?FE4R  
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    'Cleanup ]ODC+q1  
    ClearOutputWindow() EUe2<G  
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    Print "Merging RPC Photonics BSDF Data Files" PQXyu1  
    SetTextColor(255,0,0) q[1H=+  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 1p23&\\~  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." m^O:k"+!  
    SetTextColor(0,0,0) KcfW+> W3  
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    'Current directory of this script (should be the same as the text files being merged) \%E Zg  
    Dim cDir As String av gGz8  
    cDir = MacroDir$ & "\" RV^2[Gdi  
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    'Array which will be populated with the list of files to be merged b UAjt>+  
    Dim fList() As String, curFile As String %g0"Kj5  
    GetFileList( cDir, fList ) *WfOB2rU  
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    Print "" . %tc7`k8  
    Print "Files found for merging:" PFG):i-?  
    For Each curFile In fList 5cxA,T  
        Print Chr(9) & curFile NV*aHci  
    Next t_3)}  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. sG0cN;I]t  
    Dim nameArray() As String, sampName As String k^]+I% ?Q  
    nameArray = Split(fList(0)," 0-0.txt") .pi#Z /v  
    sampName  = nameArray(0) =9YyUAJZ  
    Print "" l8GziM{lp  
    Print "Sample name: " & Chr(9) & sampName `wB(J%w  
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    'Open an output file and write the FRED header data p."pI Bd  
    Dim outFile As String _myam3[W  
    outFile = cDir & sampName & "_FRED.txt" |j^>6nE  
    Open outFile For Output As #1 0d`s(b54;O  
    Print #1, "type bsdf_data" {NKDmeg:D  
    Print #1, "format angles=deg bsdf=value scale=1" /.$n>:XR  
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    'Loop the file list, skip the two header lines and write the remaining data to file %I(N  
    Dim lineArray() As String, curLine As Long uc=-+*D'I  
    For Each curFile In fList mV`Z]-$$i  
        Print "Merging data from file " & curFile [ #A!B#`  
        ReadFile( cDir & curFile, lineArray ) #rzxFMA"  
        For curLine = 2 To UBound(lineArray) %nF6n:|:  
            Print #1, lineArray(curLine) /qo.Z  
        Next .4_EaQ;jX  
    Next 6g@j,iFy  
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    'Close the output file ',kYZay  
    Close #1 3UD_2[aqN(  
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    Print "Finished merging RPC data for sample " & sampName He)v:AH  
    Print "FRED formatted data file: " & Chr(9) & outFile <|hvH  
End Sub eO (VSjo'`  
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'Utility function to read the contents of a file into an array of strings. G}BO!Z6  
Function ReadFile(ByVal fileName As String, _ '"~|L>F%G  
                  ByRef lineArray() As String) As Long *@cXBav/<  
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    ReadFile = -1 JT[|l-\zo  
    Dim oFSO As Object yew9bn0a=  
    Set oFSO = CreateObject("Scripting.FileSystemObject") UR1U; k  
    Erase lineArray tE3!;  
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    Dim fid As Long 8.{5c6G  
    If oFSO.fileexists( fileName ) Then !wJ~p:vRdY  
        fid = FreeFile() C[&  \Xq  
        Open fileName For Input As fid `cy_@Z5A  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) -?2ThvT  
        Close fid {]Nvq9?  
    End If |"5NI'X?  
    Set oFSO = Nothing g>/,},jv[x  
    Return UBound( lineArray ) Rzj5B\+Rk(  
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End Function E2LpQNvN%g  
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Sub GetFileList( ByVal in_dir As String, _ ~U~KUL|  
                 ByRef in_flist() As String ) .N5}JUj  
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    'Redimension the file list array w/~,mzM"  
    Erase in_flist *-3K],^a  
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    'Tracks how many files are found HB||'gIC  
    Dim fCount As Long < :<E~anH  
    fCount = 0 ]A5FN4 E  
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    'Recurse directory and search for text files 2?z3s|+[  
    Dim f As String QyJ}zwD  
    f = Dir$(in_dir & "*.txt") ;&s`g   
    While f <> "" ^0pd- n@pn  
        ReDim Preserve in_flist(fCount) fp.,MIS  
        in_flist(fCount) = f ,=Xr'7w,  
        fCount += 1 |k^'}n  
        f = Dir$() ,gUSW  
    Wend Ra%RcUf~sh  
    ReDim Preserve in_flist(fCount-1)

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