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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 {NgY8w QB  
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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 }AZx/[k |z  
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。 G;c0  
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。 mIEaWE;E"  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 )wv[!cYyW  
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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。 X3iRR{< @  
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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 e2l`!1m  
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 yPG\ &Bo  
例如下所示: ?V:]u 3  
Sample name:  EDF-C1-56 [3sxzU!t~  
Merging data from file EDF-C1-56 0-0.txt ,xe@G)a  
Finished merging RPC data for sample EDF-C1-56 {&u7kWD|  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Qwo9>ClC  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 m3Z}eC8LK  
a. 创建一个新的散射库 A6y~_dt  
b. 散射模型命名 !XA%[u  
c. 改变散射模型为“Tabulated BSDF”. uNZ>oP>  
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 ) Y1aF._Z  
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。 5@t uo`k  
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, Q*&aC|b&  
g. 点击OK xc<eU`-' b  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 n.6 0$kR`  
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脚本代码 5OW8G][  
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'#Language "WWB-COM" HZ<f(  
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Option Explicit /xm#:+Sc  
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Sub Main !0csNg!  
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    'Cleanup BOiz ~h6  
    ClearOutputWindow() LXu"rfp  
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    Print "Merging RPC Photonics BSDF Data Files" U>_\  
    SetTextColor(255,0,0) +b,31  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." "kBqY+:Cn  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." EfBVu  
    SetTextColor(0,0,0) : Nj`_2  
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    'Current directory of this script (should be the same as the text files being merged) n:^"[Le  
    Dim cDir As String +`s&i%{1>  
    cDir = MacroDir$ & "\" @+\S!o3m  
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    'Array which will be populated with the list of files to be merged Gz[ym j)5  
    Dim fList() As String, curFile As String  kulQR>u  
    GetFileList( cDir, fList ) U_}A{bFG  
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    Print "" M$]O=2h+2  
    Print "Files found for merging:" +G!jKta7B  
    For Each curFile In fList [N95.aD  
        Print Chr(9) & curFile gR-Qj  
    Next I~]Q55  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. A M1C $  
    Dim nameArray() As String, sampName As String Id.Z[owC`Y  
    nameArray = Split(fList(0)," 0-0.txt") 8pq-nuf|K  
    sampName  = nameArray(0) ]Ic?:lKN  
    Print "" +F7<5YW&(  
    Print "Sample name: " & Chr(9) & sampName %7(kP}y*  
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    'Open an output file and write the FRED header data )p!*c,  
    Dim outFile As String i#]aV]IT  
    outFile = cDir & sampName & "_FRED.txt" =,C9O  
    Open outFile For Output As #1 .?i-rTF:  
    Print #1, "type bsdf_data" AJ#m6`M+EK  
    Print #1, "format angles=deg bsdf=value scale=1" =##s;zj(%  
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    'Loop the file list, skip the two header lines and write the remaining data to file }ED nLou  
    Dim lineArray() As String, curLine As Long WBw M;S#%  
    For Each curFile In fList e:$7^Y,U/  
        Print "Merging data from file " & curFile S[L#M;n  
        ReadFile( cDir & curFile, lineArray ) [j=,g-EOA  
        For curLine = 2 To UBound(lineArray) $@_<$t  
            Print #1, lineArray(curLine) kh<pLI>$h  
        Next h"PS-]:CD  
    Next Y[ iDX#  
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    'Close the output file U BhciZ  
    Close #1 _^6|^PT.  
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    Print "Finished merging RPC data for sample " & sampName 'n l RY5@2  
    Print "FRED formatted data file: " & Chr(9) & outFile >&<<8Ln  
End Sub tIGVB+g{F  
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'Utility function to read the contents of a file into an array of strings. N>A{)_k3  
Function ReadFile(ByVal fileName As String, _ aJ5H3X}Y  
                  ByRef lineArray() As String) As Long Sg.+`xww3  
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    ReadFile = -1 ggm2%|?X  
    Dim oFSO As Object tLD~  
    Set oFSO = CreateObject("Scripting.FileSystemObject") KMK&[E#r  
    Erase lineArray zd*3R+>U'>  
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    Dim fid As Long 6%gB E  
    If oFSO.fileexists( fileName ) Then 9^ >M>f"  
        fid = FreeFile() AezvBY0'`z  
        Open fileName For Input As fid Sc1+(z  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) JJ/1daj  
        Close fid &jV9*  
    End If <#+oQ>5s  
    Set oFSO = Nothing JQ) 4}t  
    Return UBound( lineArray ) *M> iZO*@  
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End Function G3RrjWtO  
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Sub GetFileList( ByVal in_dir As String, _ gohAp  
                 ByRef in_flist() As String ) ;YK!EMM4!h  
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    'Redimension the file list array `y\*m]:  
    Erase in_flist tmO;:n<N  
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    'Tracks how many files are found {fog<1c  
    Dim fCount As Long Z69+yOJI  
    fCount = 0 8G0  
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    'Recurse directory and search for text files _Kc 1  
    Dim f As String .A3DFm3t  
    f = Dir$(in_dir & "*.txt") UI!6aVL.  
    While f <> "" s1X]RXX&j  
        ReDim Preserve in_flist(fCount) r1i$D  
        in_flist(fCount) = f 1&"-*)  
        fCount += 1 <Ctyht0c.  
        f = Dir$() %mY|  
    Wend Wgxn`6  
    ReDim Preserve in_flist(fCount-1) 5^)?mA  
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End Sub Zxg1M  
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