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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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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。 Zp7Pw   
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。 GKFRZWXdT  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 \(pwHNSafk  
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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。 .jD!+wv{9  
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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) O8 .iP+  
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 6]iU-k0b  
例如下所示: , ~ 1+MZ=  
Sample name:  EDF-C1-56 Led\S;pl  
Merging data from file EDF-C1-56 0-0.txt J>v[5FX+  
Finished merging RPC data for sample EDF-C1-56 4,;*sc6*  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt q7lC}'2fu  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 <<01@Q <  
a. 创建一个新的散射库 Ibz9j uY  
b. 散射模型命名 _$R=F/88  
c. 改变散射模型为“Tabulated BSDF”. B6dU6"  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) `+n0a@BVB  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 |Lg2;P7\  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, t[TM\j0jW  
g. 点击OK <\epj=OclV  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 B/l^=u+-  
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脚本代码 r\"R?P$y|  
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'#Language "WWB-COM" "9P @bA  
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Option Explicit KD A8x W  
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Sub Main RVA ku  
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    'Cleanup )tBz=hy#  
    ClearOutputWindow() 9.(|ri  
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    Print "Merging RPC Photonics BSDF Data Files" zd%f5L('  
    SetTextColor(255,0,0) [KBa=3>{  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." :!s7B|_U  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 02Vfg42  
    SetTextColor(0,0,0) bJn&Y  
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    'Current directory of this script (should be the same as the text files being merged) G%HG6  
    Dim cDir As String iN8[^,2H|  
    cDir = MacroDir$ & "\" [[c0g6  
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    'Array which will be populated with the list of files to be merged Evj%$7H1L1  
    Dim fList() As String, curFile As String >rlUV"8jY;  
    GetFileList( cDir, fList ) w=fWW^>bP  
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    Print "" Jw5@#j  
    Print "Files found for merging:" O>~@>/#  
    For Each curFile In fList HXT"&c|  
        Print Chr(9) & curFile 33<{1Y[Q6E  
    Next LT$t%V0?.e  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. .+S%hT,v6i  
    Dim nameArray() As String, sampName As String K/B$1+O  
    nameArray = Split(fList(0)," 0-0.txt") [<,7LG<  
    sampName  = nameArray(0) Fk49~z   
    Print "" 564L.^$@|  
    Print "Sample name: " & Chr(9) & sampName 47(_5PFb#  
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    'Open an output file and write the FRED header data b;D  
    Dim outFile As String wtSU43D  
    outFile = cDir & sampName & "_FRED.txt" aPlEM_escS  
    Open outFile For Output As #1 WYF8?1dt +  
    Print #1, "type bsdf_data" A5F (-  
    Print #1, "format angles=deg bsdf=value scale=1" *~GI-h  
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    'Loop the file list, skip the two header lines and write the remaining data to file %Qz<Lk">.  
    Dim lineArray() As String, curLine As Long I(7 GVYM  
    For Each curFile In fList ,sSo\%  
        Print "Merging data from file " & curFile o5J6Xi0+  
        ReadFile( cDir & curFile, lineArray ) Fc[vs52  
        For curLine = 2 To UBound(lineArray) Q\s+w){f%  
            Print #1, lineArray(curLine) d#+Ne f5  
        Next r'nPP6`  
    Next R\ 8[6H  
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    'Close the output file s@$0!8sxm  
    Close #1 Zgh~7Z/  
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    Print "Finished merging RPC data for sample " & sampName u~*A-X [  
    Print "FRED formatted data file: " & Chr(9) & outFile l'4<^q  
End Sub ' *XIp:  
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'Utility function to read the contents of a file into an array of strings. (M|DNDM'd  
Function ReadFile(ByVal fileName As String, _ 4jDi3MMU9  
                  ByRef lineArray() As String) As Long XM5)|D  
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    ReadFile = -1 C3^3<  
    Dim oFSO As Object 6X9$T11Vc  
    Set oFSO = CreateObject("Scripting.FileSystemObject") @TW:6v`  
    Erase lineArray DM v;\E~D  
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    Dim fid As Long Zs t)S(  
    If oFSO.fileexists( fileName ) Then +JG05h%'  
        fid = FreeFile() g&$5!ifgi  
        Open fileName For Input As fid H0tu3Pqk  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) d , g~.iS~  
        Close fid c}$>UhLe  
    End If [<d ~b*/  
    Set oFSO = Nothing O[$X36z  
    Return UBound( lineArray ) {q$U\y%Rq  
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End Function #t Uhul/O  
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Sub GetFileList( ByVal in_dir As String, _ [u*7( 4e  
                 ByRef in_flist() As String ) .<%q9Jy#  
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    'Redimension the file list array "qC3%9e  
    Erase in_flist q1YNp`]0i8  
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    'Tracks how many files are found }8l+Jd3"  
    Dim fCount As Long dHOH]x  
    fCount = 0 [E<A/_z  
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    'Recurse directory and search for text files Ow1+zltgj-  
    Dim f As String Y ?~n6<  
    f = Dir$(in_dir & "*.txt") [7x;H  
    While f <> "" SF:{PgGMi  
        ReDim Preserve in_flist(fCount) MY\mo,#  
        in_flist(fCount) = f q2|z \  
        fCount += 1 OY|9V  
        f = Dir$() o6 NmDv5  
    Wend SZ4y\I  
    ReDim Preserve in_flist(fCount-1) ;7E"@b,tPN  
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End Sub @ >'Wiq!  
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