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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 KoNu{TJ  
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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 }`<&l  
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。 WSH[*jMA  
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。 ?QT6q]|d0+  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 ErK1j  
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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。 r3g^ 0|)  
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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) ZgxB7zl//  
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 >[;@ [4}  
例如下所示: ~hvj3zC5xz  
Sample name:  EDF-C1-56 )DXt_leLg  
Merging data from file EDF-C1-56 0-0.txt ?lsK?>uU  
Finished merging RPC data for sample EDF-C1-56 r$={_M$  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Bgm8IK)6  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 (46'#E z[F  
a. 创建一个新的散射库 CXuD%H]tx  
b. 散射模型命名 /Pg)7Zn  
c. 改变散射模型为“Tabulated BSDF”. 0AQ4:KV(Y  
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 ) [_)`G*X(N  
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。 hD ~/ywS&  
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, fAULuF  
g. 点击OK hI86WP9*  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 J.1 c,@  
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脚本代码 !+PrgIp>  
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'#Language "WWB-COM" LBy`N_@  
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Option Explicit Df4O~j$U"s  
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Sub Main ['}|#3*w  
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    'Cleanup |:R\j0t  
    ClearOutputWindow() :.+w'SEn4M  
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    Print "Merging RPC Photonics BSDF Data Files" ZwMVFC-d  
    SetTextColor(255,0,0) S!8<|WO^t  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." CqnHh@]nu  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." >j=ZB3yZ  
    SetTextColor(0,0,0) x *I'Ar  
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    'Current directory of this script (should be the same as the text files being merged) %1A8m-u]M  
    Dim cDir As String "mJo<i}  
    cDir = MacroDir$ & "\" .jQx2 O  
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    'Array which will be populated with the list of files to be merged s9wzN6re  
    Dim fList() As String, curFile As String %"H:z  
    GetFileList( cDir, fList ) uQW)pD{_  
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    Print "" kC.dJ2^j+  
    Print "Files found for merging:" 3%)cUkD  
    For Each curFile In fList QlGK+I>y;  
        Print Chr(9) & curFile K:U=Y$x  
    Next _;PQt" ]  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 1!1JT;gG^9  
    Dim nameArray() As String, sampName As String -KGJr  
    nameArray = Split(fList(0)," 0-0.txt") M$EF 8   
    sampName  = nameArray(0) { }/  
    Print "" )jL@GW  
    Print "Sample name: " & Chr(9) & sampName @H?OHpJ"`  
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    'Open an output file and write the FRED header data 3~P$p<  
    Dim outFile As String }SSg>.48w  
    outFile = cDir & sampName & "_FRED.txt" i 7]o[  
    Open outFile For Output As #1 */K[B(G  
    Print #1, "type bsdf_data" 2@a'n@-  
    Print #1, "format angles=deg bsdf=value scale=1" %.$!VTO"  
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    'Loop the file list, skip the two header lines and write the remaining data to file k5\V:P=#  
    Dim lineArray() As String, curLine As Long Ja3#W K  
    For Each curFile In fList ^ZsIQ4@`  
        Print "Merging data from file " & curFile k$%{w\?Jf  
        ReadFile( cDir & curFile, lineArray ) $R #_c}  
        For curLine = 2 To UBound(lineArray) c:K/0zY  
            Print #1, lineArray(curLine) jF;<9-m&  
        Next 1^$hbRq  
    Next Q I";[  
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    'Close the output file 28^/By:J  
    Close #1 h:pgN,W}  
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    Print "Finished merging RPC data for sample " & sampName 5]*lH t  
    Print "FRED formatted data file: " & Chr(9) & outFile bsu?Q'q  
End Sub @] .s^ss9_  
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'Utility function to read the contents of a file into an array of strings. mdL T7  
Function ReadFile(ByVal fileName As String, _ k`>qb8,  
                  ByRef lineArray() As String) As Long zk$h71<{.  
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    ReadFile = -1 49E| f ^q  
    Dim oFSO As Object \Nik`v*Pd  
    Set oFSO = CreateObject("Scripting.FileSystemObject") =Jl\^u%H(x  
    Erase lineArray *P *.'XM  
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    Dim fid As Long mL1ZSX o!  
    If oFSO.fileexists( fileName ) Then D7pQWlN\  
        fid = FreeFile() eW.qMx#:od  
        Open fileName For Input As fid gs1  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 5L6.7}B  
        Close fid XzV>q~I3|E  
    End If MDa[bQ NM  
    Set oFSO = Nothing }%wP^6G*x\  
    Return UBound( lineArray ) ;0_T\{H"nR  
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End Function #p=+RTZ<  
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Sub GetFileList( ByVal in_dir As String, _ w:B&8I(n}w  
                 ByRef in_flist() As String ) v0WB.`rO  
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    'Redimension the file list array ~C 3 Y/}  
    Erase in_flist <EyJ $$  
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    'Tracks how many files are found 7oLlRU  
    Dim fCount As Long ~*h)`uM  
    fCount = 0 ;xTMOuI*  
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    'Recurse directory and search for text files gz'{l[  
    Dim f As String \l(}8;5}  
    f = Dir$(in_dir & "*.txt") ++w{)Io Z  
    While f <> "" bg3kGt0  
        ReDim Preserve in_flist(fCount) 0F!Uai1  
        in_flist(fCount) = f e+Mm!\ ;`  
        fCount += 1 )e[q% %ks  
        f = Dir$() unYPvrd  
    Wend x?6^EB|@  
    ReDim Preserve in_flist(fCount-1) 9&kY>M>z0  
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End Sub K~&3etQF  
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