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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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摘要 }1CO>a<  
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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。 (1{OQ0N+x  
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背景 Vx0Hq`_14  
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。 3H"F~_H  
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 v/KTEM  
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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。 <0`"vPU  
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) /KvpJ4  
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 nYRD>S?uz  
例如下所示: =8r,-3lC;  
Sample name:  EDF-C1-56 f}FJR6VO  
Merging data from file EDF-C1-56 0-0.txt 9D%~~~ %b  
Finished merging RPC data for sample EDF-C1-56 mOjl0n[To]  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt H<b4B$/  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 1^;&?E  
b. 散射模型命名 t^9q>[/d`  
c. 改变散射模型为“Tabulated BSDF”. !q PUQ+  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 8>:2li  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 8J9o$Se  
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, D3 E!jQ1  
g. 点击OK eP3 itrH(  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 e''Wm.>g(+  
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脚本代码 WUi7~Ei}  
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'#Language "WWB-COM" r?2C%GI`  
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Option Explicit X]CaWxM  
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Sub Main 5O%}.}n  
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    'Cleanup }mJ)gK5b 6  
    ClearOutputWindow() AB#hh i#  
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    Print "Merging RPC Photonics BSDF Data Files" 8@Km@o]?  
    SetTextColor(255,0,0) X!_OOfueP8  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." #wm)e)2@  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." &q` =xF  
    SetTextColor(0,0,0) %BHq2~J  
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    'Current directory of this script (should be the same as the text files being merged) IweQB}d  
    Dim cDir As String q C|re!K  
    cDir = MacroDir$ & "\" IX3U\_I#  
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    'Array which will be populated with the list of files to be merged AU$5"kBE  
    Dim fList() As String, curFile As String J<zg 'Jk^  
    GetFileList( cDir, fList ) a+BA~|u^  
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    Print "" ZyWC_r!  
    Print "Files found for merging:" wYawG$@_  
    For Each curFile In fList 2Uk8{d  
        Print Chr(9) & curFile *AN#D?X_  
    Next 9_/1TjrDN  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. !c`1~a!  
    Dim nameArray() As String, sampName As String 5Np.&  
    nameArray = Split(fList(0)," 0-0.txt") BPOWo8TqD^  
    sampName  = nameArray(0) [E/3&3  
    Print "" Tuy*Df  
    Print "Sample name: " & Chr(9) & sampName Fu><lN7  
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    'Open an output file and write the FRED header data V)Xcn'h  
    Dim outFile As String .lnD]Q  
    outFile = cDir & sampName & "_FRED.txt" y|mR'{$I  
    Open outFile For Output As #1 V!=]a^]:  
    Print #1, "type bsdf_data" C|JWom\J  
    Print #1, "format angles=deg bsdf=value scale=1" 1|89-Ii]  
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    'Loop the file list, skip the two header lines and write the remaining data to file ljCgIfZ_4  
    Dim lineArray() As String, curLine As Long 0nuFWV  
    For Each curFile In fList [6tQv<}^  
        Print "Merging data from file " & curFile Aws TDM  
        ReadFile( cDir & curFile, lineArray ) O#|E7;  
        For curLine = 2 To UBound(lineArray) & Gt9a-ne  
            Print #1, lineArray(curLine) ;g*6NzdA  
        Next }?^G= IP4(  
    Next 0.5_,an3  
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    'Close the output file -|kDa1knA  
    Close #1 !1_:nD  
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    Print "Finished merging RPC data for sample " & sampName ;vx9xs?6  
    Print "FRED formatted data file: " & Chr(9) & outFile _ Owz%  
End Sub J5"*OH:f  
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'Utility function to read the contents of a file into an array of strings. 1&<@(S<  
Function ReadFile(ByVal fileName As String, _ V+q RDQ  
                  ByRef lineArray() As String) As Long -wt2ydzos  
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    ReadFile = -1 hg~fFj3ST  
    Dim oFSO As Object YGO@X(ej,  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 90!Ib~7zH  
    Erase lineArray 7$;$4.'  
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    Dim fid As Long H#y"3E<s  
    If oFSO.fileexists( fileName ) Then #wyS?FP-  
        fid = FreeFile() @:@rks&  
        Open fileName For Input As fid '9gI=/29D  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~83P09\T%  
        Close fid (r4\dp&  
    End If SJ-Sac58r  
    Set oFSO = Nothing ,L;vN6~  
    Return UBound( lineArray )  df'g},_  
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End Function aBnbu vp  
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Sub GetFileList( ByVal in_dir As String, _ A.b#r[  
                 ByRef in_flist() As String ) _u>>+6,p  
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    'Redimension the file list array i]z i[Zo$  
    Erase in_flist / ["T#`  
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    'Tracks how many files are found 'Ot[q^,KRG  
    Dim fCount As Long 8E+l; 2  
    fCount = 0 Tjqn::~D  
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    'Recurse directory and search for text files h~p}08  
    Dim f As String JPG!cX%  
    f = Dir$(in_dir & "*.txt") I\~V0<"jI  
    While f <> "" =*Xf(mhc  
        ReDim Preserve in_flist(fCount) D.b<I79bX  
        in_flist(fCount) = f MV}]i@ V  
        fCount += 1 )|x5#b-lz  
        f = Dir$() (&,R1dLo  
    Wend HV.7IyBA^  
    ReDim Preserve in_flist(fCount-1)

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