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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 <o_H]c->  
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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 }cll? 2  
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。 L`ZH.fN  
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。 m.MOn3n]  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 Ywf.,V  
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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。 j+n1k^jC  
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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) ~PUz/^^ s  
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 $+sNjwv^F  
例如下所示: \HDRr*KO  
Sample name:  EDF-C1-56 EM*YN=So  
Merging data from file EDF-C1-56 0-0.txt 'Z-jj2t}  
Finished merging RPC data for sample EDF-C1-56 ()vxTTa  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6ZVJ2xs[%  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 YSt']  
a. 创建一个新的散射库 iuq-M?1  
b. 散射模型命名 (i7]N[  
c. 改变散射模型为“Tabulated BSDF”. X;T(?,,  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) nVoPTr  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 zQ}:_  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, _.Y?BAQ  
g. 点击OK !h2ZrT9 _  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 j]6j!.1  
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脚本代码 !E> *Mn  
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'#Language "WWB-COM" . #;ZM[v  
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Option Explicit GLL,  
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Sub Main }@}jwi)l  
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    'Cleanup )oa6;=go  
    ClearOutputWindow() (eN\s98)/  
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    Print "Merging RPC Photonics BSDF Data Files" Y ,B0=}  
    SetTextColor(255,0,0) u%#bu^4"  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 'rU [V+  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." qr(SAIX"  
    SetTextColor(0,0,0) C2,,+* v  
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    'Current directory of this script (should be the same as the text files being merged) A5+vzu^  
    Dim cDir As String %? _pSH}$!  
    cDir = MacroDir$ & "\" _odP:  
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    'Array which will be populated with the list of files to be merged )`^t,x<S  
    Dim fList() As String, curFile As String %K /=7  
    GetFileList( cDir, fList ) k#ED#']N  
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    Print "" O(h4;'/E  
    Print "Files found for merging:" sn/^#Aa=N  
    For Each curFile In fList -d6| D?}S  
        Print Chr(9) & curFile &2MW.,e7s  
    Next 2IqsBK`  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. c{6!}0Q4  
    Dim nameArray() As String, sampName As String h2!We#  
    nameArray = Split(fList(0)," 0-0.txt") 8,#v7ns}#  
    sampName  = nameArray(0) 7Xm pq&g  
    Print "" ykxjT@[  
    Print "Sample name: " & Chr(9) & sampName a{QHv0goG  
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    'Open an output file and write the FRED header data U"A]b(54  
    Dim outFile As String r~z-l,  
    outFile = cDir & sampName & "_FRED.txt" a [iC!F2  
    Open outFile For Output As #1 Zk)]=<H  
    Print #1, "type bsdf_data" P(d4~hS  
    Print #1, "format angles=deg bsdf=value scale=1" ,+KZn}>  
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    'Loop the file list, skip the two header lines and write the remaining data to file x,STt{I=  
    Dim lineArray() As String, curLine As Long \('8 _tqI"  
    For Each curFile In fList ?7'uo$  
        Print "Merging data from file " & curFile #]oVVf_  
        ReadFile( cDir & curFile, lineArray ) Z+=WgEu1  
        For curLine = 2 To UBound(lineArray) OO] ~\j  
            Print #1, lineArray(curLine) OA_:_%a(  
        Next .KGW#Qk8  
    Next S`BLwnU`#  
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    'Close the output file KO<Yc`Fs  
    Close #1 ddmTMfH  
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    Print "Finished merging RPC data for sample " & sampName 9Y- Sqk+  
    Print "FRED formatted data file: " & Chr(9) & outFile 9;k_"@A6  
End Sub ny| ni\6  
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'Utility function to read the contents of a file into an array of strings. =4"D8 UaHr  
Function ReadFile(ByVal fileName As String, _ @|6n.'f+  
                  ByRef lineArray() As String) As Long G\?fWqx  
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    ReadFile = -1 :se o0w]  
    Dim oFSO As Object G)';ucs:,  
    Set oFSO = CreateObject("Scripting.FileSystemObject") '`#2'MXG  
    Erase lineArray Gmi4ffIb3  
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    Dim fid As Long b-'41d}Hn  
    If oFSO.fileexists( fileName ) Then "D'A7DA  
        fid = FreeFile() z*.4Y  
        Open fileName For Input As fid [nJ),9$z_  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) iv2did4  
        Close fid CDQ}C=4  
    End If Lo\+T+n  
    Set oFSO = Nothing :D8V*F6P  
    Return UBound( lineArray ) [h+MA>%!  
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End Function jwgXq(  
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Sub GetFileList( ByVal in_dir As String, _ Cb7f-Eag  
                 ByRef in_flist() As String ) zdrCr0Rx,  
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    'Redimension the file list array Dj'aWyW'  
    Erase in_flist jxU1u"WU  
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    'Tracks how many files are found  ~Jrtm7  
    Dim fCount As Long E% t_17,=j  
    fCount = 0 &[f.;1+C  
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    'Recurse directory and search for text files (ec?_N0=  
    Dim f As String iY1%"x  
    f = Dir$(in_dir & "*.txt") Q3vC^}Dmr  
    While f <> "" <[ />M  
        ReDim Preserve in_flist(fCount) BoE;,s>]NW  
        in_flist(fCount) = f m_\w)  
        fCount += 1 EYtf>D  
        f = Dir$() Gkv<)}G  
    Wend "5"6mw?  
    ReDim Preserve in_flist(fCount-1) i\lur ET  
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End Sub :'9%~q.D4  
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