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infotek 2023-05-11 08:31

RPC Photonics扩散片BSDF

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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 8UIL_nPO  
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。 9^='&U9sr  
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。 PNKT\yd  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 4l''/$P  
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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。 .Y|\7%(  
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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) N%f!B"NQ  
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 /[? F1Q  
例如下所示: .$0Ob<.  
Sample name:  EDF-C1-56 j7 =3\SO  
Merging data from file EDF-C1-56 0-0.txt Qs9U&*L  
Finished merging RPC data for sample EDF-C1-56 @MB _gt)7?  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt :BX{ *P  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 -o_T C  
a. 创建一个新的散射库 ,)$KS*f"*z  
b. 散射模型命名 = Y-Ne6a  
c. 改变散射模型为“Tabulated BSDF”. F2$bUY  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) DME?kh>7  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 o0G`Xn  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, <j\;>3Q  
g. 点击OK 7V{"!V5  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 k |3(dXLG  
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脚本代码 aNC,ccm  
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'#Language "WWB-COM" 5 ek %d  
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Option Explicit Bh,)5E^m  
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Sub Main /iy*3P,`  
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    'Cleanup 8Wx@[!  
    ClearOutputWindow() {[5L96RH%  
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    Print "Merging RPC Photonics BSDF Data Files" (oitCIV  
    SetTextColor(255,0,0) nRB>[lG  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Z 'NbHwW}  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." :{s%=\k {d  
    SetTextColor(0,0,0) Ws*PMK.0  
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    'Current directory of this script (should be the same as the text files being merged) 1Bk*G>CX9(  
    Dim cDir As String @k+G Cf  
    cDir = MacroDir$ & "\" y3nm!tjyM  
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    'Array which will be populated with the list of files to be merged Gr"7w[|+  
    Dim fList() As String, curFile As String bp>ps@zFq  
    GetFileList( cDir, fList ) !)/iRw9re  
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    Print "" k,R~oSA'n  
    Print "Files found for merging:" *_<*bhR<  
    For Each curFile In fList |5IY`;+9  
        Print Chr(9) & curFile [Ht."VxR  
    Next sIRrEea  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 2]NAs9aZ  
    Dim nameArray() As String, sampName As String mU+FQX  
    nameArray = Split(fList(0)," 0-0.txt") @yn^6cE  
    sampName  = nameArray(0) ^?X ^+  
    Print "" JNFT6T)T15  
    Print "Sample name: " & Chr(9) & sampName Hx2j=Q_dw  
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    'Open an output file and write the FRED header data [ lzy &To  
    Dim outFile As String Iq0 #A5U%  
    outFile = cDir & sampName & "_FRED.txt"  LbV]JP  
    Open outFile For Output As #1 ]PzTl {]  
    Print #1, "type bsdf_data" c_G-R+  
    Print #1, "format angles=deg bsdf=value scale=1" HcBH!0  
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    'Loop the file list, skip the two header lines and write the remaining data to file 9O=05CQ  
    Dim lineArray() As String, curLine As Long CS;W)F  
    For Each curFile In fList ^?6 W<  
        Print "Merging data from file " & curFile 1>@]@ST[:  
        ReadFile( cDir & curFile, lineArray ) D){"fw+b  
        For curLine = 2 To UBound(lineArray) 64!ame}n+  
            Print #1, lineArray(curLine) CFBUQMl >  
        Next (]}x[F9l  
    Next ll(e,9.D  
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    'Close the output file g^z5fFLg/8  
    Close #1 qXU:A-IdIl  
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    Print "Finished merging RPC data for sample " & sampName {V%%^Zhwy  
    Print "FRED formatted data file: " & Chr(9) & outFile 7TV>6i+7  
End Sub yul<n>X|  
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'Utility function to read the contents of a file into an array of strings. 8g[ (nxI~  
Function ReadFile(ByVal fileName As String, _ K#l  -?  
                  ByRef lineArray() As String) As Long } T/}0W]0  
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    ReadFile = -1 Ko$ $dkSE  
    Dim oFSO As Object Q$?7)yyu+  
    Set oFSO = CreateObject("Scripting.FileSystemObject") +Mk*{ A t  
    Erase lineArray _Sly7_  
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    Dim fid As Long |t&G&)~:  
    If oFSO.fileexists( fileName ) Then _'!N q  
        fid = FreeFile() T .Pklty  
        Open fileName For Input As fid J|gdO+  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) d`?U!?Si  
        Close fid u#41osUVW>  
    End If MPKpS3VS  
    Set oFSO = Nothing [!J @a  
    Return UBound( lineArray ) |TB@@ 2Ky&  
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End Function aPD?Bh>JU  
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Sub GetFileList( ByVal in_dir As String, _ _=|nOj39  
                 ByRef in_flist() As String ) <[Tq7cO0  
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    'Redimension the file list array :LZ-da"QR  
    Erase in_flist iUeV5cB  
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    'Tracks how many files are found t(J![wB}  
    Dim fCount As Long C1X}3bB  
    fCount = 0 D'7A2f  
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    'Recurse directory and search for text files <Jwi ~I=^  
    Dim f As String Ci]'G>F@"  
    f = Dir$(in_dir & "*.txt") uSABh ^  
    While f <> "" p!HPp Ef+#  
        ReDim Preserve in_flist(fCount) $R A4U<  
        in_flist(fCount) = f i{TIm}_\  
        fCount += 1 Z B~l2  
        f = Dir$() 0M$#95n  
    Wend A#v|@sul  
    ReDim Preserve in_flist(fCount-1) d{QMST2&  
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End Sub %/UV_@x&  
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