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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 <=fYz^|XT  
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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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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。 E3IB> f  
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。 =pQ'wx|>|  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 !j"r}c`  
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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。 MfzSoxCb  
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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) 2D,EWk/4  
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 u} y)'eH  
例如下所示: RweK<Flo'S  
Sample name:  EDF-C1-56 %`rZ]^H  
Merging data from file EDF-C1-56 0-0.txt s*A#;  
Finished merging RPC data for sample EDF-C1-56 R*m=V{iu`  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Yxe%:  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 N@Ie VF  
a. 创建一个新的散射库 Q>`|{m  
b. 散射模型命名 .2y2Qm  
c. 改变散射模型为“Tabulated BSDF”. ]xO`c  
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 ) u;{,,ct  
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。 AQCU\E  
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, >Q159qZ  
g. 点击OK ZM:!LkK  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 zq(R!a6  
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脚本代码 pq<302uBQ  
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'#Language "WWB-COM" La$*)qD,  
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Option Explicit Xi^#F;@sU  
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Sub Main q|Oz   
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    'Cleanup z: x|;Ps!  
    ClearOutputWindow() [QC|Kd^#  
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    Print "Merging RPC Photonics BSDF Data Files" ^Q)&lxlxpx  
    SetTextColor(255,0,0) cr;\;Ta_!W  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." =!@5!  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." !F@9xG  
    SetTextColor(0,0,0) t-, =sV  
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    'Current directory of this script (should be the same as the text files being merged) ]`p*ZTr)\  
    Dim cDir As String Us5P?}  
    cDir = MacroDir$ & "\" v61'fQ1Qg!  
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    'Array which will be populated with the list of files to be merged #M9rt ~4  
    Dim fList() As String, curFile As String ]KsL(4PY  
    GetFileList( cDir, fList ) Lm-yTMNPn  
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    Print "" G-vBJlt=t  
    Print "Files found for merging:" ENmfbJ4d~  
    For Each curFile In fList Sqt '}  
        Print Chr(9) & curFile rKK{*%n  
    Next B~[}E]WEK  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. n/>^!S  
    Dim nameArray() As String, sampName As String #&L[?jEn  
    nameArray = Split(fList(0)," 0-0.txt") "`QI2{!l  
    sampName  = nameArray(0) Wr3).m52}P  
    Print "" z2EZ0vZ  
    Print "Sample name: " & Chr(9) & sampName D^R=  
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    'Open an output file and write the FRED header data nDt1oM H  
    Dim outFile As String ]HpKDb0+  
    outFile = cDir & sampName & "_FRED.txt" mJj [f8  
    Open outFile For Output As #1 BCrX>Pp }r  
    Print #1, "type bsdf_data" 7q%<JZPY  
    Print #1, "format angles=deg bsdf=value scale=1" n0/H2>I[  
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    'Loop the file list, skip the two header lines and write the remaining data to file &zGf`Zi6*%  
    Dim lineArray() As String, curLine As Long dKKh^D`~  
    For Each curFile In fList ;w\7p a  
        Print "Merging data from file " & curFile _ct18nh9  
        ReadFile( cDir & curFile, lineArray ) fj/sN HU  
        For curLine = 2 To UBound(lineArray) ?1DA  
            Print #1, lineArray(curLine) Y,?!"  
        Next fV 6$YCf  
    Next LjE@[@d  
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    'Close the output file {iz,iv/U  
    Close #1 u]D>O$_ s  
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    Print "Finished merging RPC data for sample " & sampName [<2#C#P:6  
    Print "FRED formatted data file: " & Chr(9) & outFile xaM? B7  
End Sub $r>\y (W  
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'Utility function to read the contents of a file into an array of strings. r-r)'AAO  
Function ReadFile(ByVal fileName As String, _ 6:(R/9!P  
                  ByRef lineArray() As String) As Long 7tEK&+H`  
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    ReadFile = -1 -G!W6$Y  
    Dim oFSO As Object )yHJc$OlMx  
    Set oFSO = CreateObject("Scripting.FileSystemObject") V_>)m3zsL  
    Erase lineArray st b)Tl^  
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    Dim fid As Long w6B'&  
    If oFSO.fileexists( fileName ) Then %lr<;   
        fid = FreeFile() BW`)q/  
        Open fileName For Input As fid SkmLX@:(  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) e)(m0m\  
        Close fid YTQom!O  
    End If 4yk!T  
    Set oFSO = Nothing %(9BWO  
    Return UBound( lineArray ) kLr6j-X  
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End Function oicj3xkw?  
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Sub GetFileList( ByVal in_dir As String, _ x6d0yJ <  
                 ByRef in_flist() As String ) S$=e %c  
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    'Redimension the file list array h-^7cHI}  
    Erase in_flist B\/"$"  
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    'Tracks how many files are found ! uC`7a  
    Dim fCount As Long &$'=SL(Z  
    fCount = 0 ~#doJ:^H3  
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    'Recurse directory and search for text files YivWvV  
    Dim f As String SS4'yaQ  
    f = Dir$(in_dir & "*.txt") LX i?FQnLu  
    While f <> "" ) <lpI';T  
        ReDim Preserve in_flist(fCount) Uf:G,%OYi  
        in_flist(fCount) = f vPVA^UPNV  
        fCount += 1 WFOO6 kMz  
        f = Dir$() -:5]*zVp+-  
    Wend p6VHa$[  
    ReDim Preserve in_flist(fCount-1) Oy @vh>RY  
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End Sub :6^8Q,C1@  
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