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infotek 2023-05-11 08:31

RPC Photonics扩散片BSDF

摘要 &'cL%.  
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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 ^` un'5Vk  
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。 u\&b4=nL  
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。 4XVCHs(  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 " \I4u{zC  
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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。 ;iDPn2?6?x  
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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) 6'\6OsH  
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 t78k4?  
例如下所示: LU!dN"[k  
Sample name:  EDF-C1-56 DNGvpKY@  
Merging data from file EDF-C1-56 0-0.txt !9 fz(9  
Finished merging RPC data for sample EDF-C1-56 z-M3  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt fw ,\DFHO  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Uj&W<'I  
a. 创建一个新的散射库 +`?Y?L^ J  
b. 散射模型命名 C9p"?vX  
c. 改变散射模型为“Tabulated BSDF”. ,{\Bze1fn  
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 ) LC1 (Xb f  
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。 >2#8B  
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, cuOvN"nuNj  
g. 点击OK M Zmb`%BZ  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 g{5A4|_7  
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脚本代码 `/Y{ l  
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'#Language "WWB-COM" R8.CC1Ix  
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Option Explicit 2NB L}x  
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Sub Main Ef<b~E@  
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    'Cleanup GR\5WypoJ  
    ClearOutputWindow() $s<Ne{?  
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    Print "Merging RPC Photonics BSDF Data Files" a# c6[!   
    SetTextColor(255,0,0) xe/(  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." #s!'+|2n  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ayAo^q  
    SetTextColor(0,0,0) 4H@Wc^K  
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    'Current directory of this script (should be the same as the text files being merged) Wb S4pdA  
    Dim cDir As String 8i?l02  
    cDir = MacroDir$ & "\" A&>.74}p  
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    'Array which will be populated with the list of files to be merged o/ui)U_   
    Dim fList() As String, curFile As String {[+2n]f_G  
    GetFileList( cDir, fList ) ,^S@EDq  
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    Print "" s: 3z'4oX  
    Print "Files found for merging:" *cyeO*  
    For Each curFile In fList gzeQ|m2]  
        Print Chr(9) & curFile _V\Bp=9W  
    Next LdB($4,  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. u :F~K  
    Dim nameArray() As String, sampName As String 7.j[a*^  
    nameArray = Split(fList(0)," 0-0.txt") [d* ~@P  
    sampName  = nameArray(0) Q[#vTB$f  
    Print "" 8XsguC  
    Print "Sample name: " & Chr(9) & sampName _D|^.)=U|  
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    'Open an output file and write the FRED header data ><=gV~7lx  
    Dim outFile As String  TT-h;'nJ  
    outFile = cDir & sampName & "_FRED.txt" S(7ro]U9  
    Open outFile For Output As #1 CpJ0m-7aIH  
    Print #1, "type bsdf_data" !Kv@\4  
    Print #1, "format angles=deg bsdf=value scale=1" ncx(pp  
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    'Loop the file list, skip the two header lines and write the remaining data to file 'TA UE{{  
    Dim lineArray() As String, curLine As Long ?-Vjha@BO  
    For Each curFile In fList WKSPBT;  
        Print "Merging data from file " & curFile b=/curl&  
        ReadFile( cDir & curFile, lineArray ) B*E2.\~  
        For curLine = 2 To UBound(lineArray) iPrLwheb  
            Print #1, lineArray(curLine) YZ+RWu9K  
        Next `8FUX= Sh  
    Next B4]`-mahO  
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    'Close the output file `l*;t`h  
    Close #1 <r3J0)r}  
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    Print "Finished merging RPC data for sample " & sampName 'ky b\q  
    Print "FRED formatted data file: " & Chr(9) & outFile pT$f8xJ  
End Sub )$,"u4  
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'Utility function to read the contents of a file into an array of strings. 5 QO34t2  
Function ReadFile(ByVal fileName As String, _ \Vl`YYjZ  
                  ByRef lineArray() As String) As Long 1LJUr"6]  
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    ReadFile = -1 (L`j0kPN  
    Dim oFSO As Object ^H6<Km l/V  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 72,rFYvpK  
    Erase lineArray <G*nDFWf  
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    Dim fid As Long lqb/eN9(t  
    If oFSO.fileexists( fileName ) Then 'fL"txW  
        fid = FreeFile() TFcT3]R[rL  
        Open fileName For Input As fid #h@J=Ki  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ,$eK-w  
        Close fid BAO|)~1Pd  
    End If l (3bW1{n  
    Set oFSO = Nothing ./$cMaDJ  
    Return UBound( lineArray ) q=lAb\i  
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End Function 5cWw7V<m  
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Sub GetFileList( ByVal in_dir As String, _ xB !6_VlB  
                 ByRef in_flist() As String ) %N#%|2B  
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    'Redimension the file list array 'u` .P:u?  
    Erase in_flist AO UL^$&  
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    'Tracks how many files are found 5 Qoew9rA  
    Dim fCount As Long y?SyInt  
    fCount = 0 .Udj@{  
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    'Recurse directory and search for text files #M!!CX*k  
    Dim f As String &[hLzlrg  
    f = Dir$(in_dir & "*.txt") LbtX0^  
    While f <> "" b]a@  
        ReDim Preserve in_flist(fCount) wW"z  
        in_flist(fCount) = f BW,mwq  
        fCount += 1 +<prgP`v  
        f = Dir$() )yo a  
    Wend q%5eVG  
    ReDim Preserve in_flist(fCount-1) "l >Igm  
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End Sub _f6HAGDN  
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