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infotek 2020-12-15 09:37

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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背景 Bd\p!f<  
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。 s6KZV@1  
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。 N %0F[sY6  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 t@!oc"z}@  
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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。 Ng;E]2"  
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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) uWMAXGL  
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 b`%/ *  
例如下所示: dq|z;,`  
Sample name:  EDF-C1-56 G]5'U"cj3  
Merging data from file EDF-C1-56 0-0.txt NFc< %#H  
Finished merging RPC data for sample EDF-C1-56 Zx`hutCv  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt BBy/b c!  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 <K 4zH<y  
a. 创建一个新的散射库 r$.ek\D5  
b. 散射模型命名 <Ep P;  
c. 改变散射模型为“Tabulated BSDF”. SD JAk&Z}R  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 3:);vh!  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 {mueP6Gz@J  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, [n66ZY#U]  
g. 点击OK }{ 9E~"_[  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 =">O;L.xj  
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脚本代码 X"'}1o  
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'#Language "WWB-COM" w9z((\5  
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Option Explicit |QxDjL<&t4  
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Sub Main t5e%"}>7H  
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    'Cleanup 9-)oA+$  
    ClearOutputWindow() tS`fG;  
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    Print "Merging RPC Photonics BSDF Data Files" O2A Z|[*I  
    SetTextColor(255,0,0) +mV4Ty  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." g^8bY=* .  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." L42C<  
    SetTextColor(0,0,0) iVnrv`k,  
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    'Current directory of this script (should be the same as the text files being merged) }&;0:hw%  
    Dim cDir As String 4JP01lq'\  
    cDir = MacroDir$ & "\" xae}8E   
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    'Array which will be populated with the list of files to be merged l=bB,7gL  
    Dim fList() As String, curFile As String 7kG>s9O  
    GetFileList( cDir, fList ) blxH`O!  
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    Print "" Gl}=Q7  
    Print "Files found for merging:" RQ9T<t42  
    For Each curFile In fList cdzMao  
        Print Chr(9) & curFile O,:ent|  
    Next 2{**bArV  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. _0^<)OSY  
    Dim nameArray() As String, sampName As String pD.7ib^  
    nameArray = Split(fList(0)," 0-0.txt") +B c/@.Q'  
    sampName  = nameArray(0) E}\^GNT  
    Print "" Wu:vO2aw8  
    Print "Sample name: " & Chr(9) & sampName #). om*Xh  
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    'Open an output file and write the FRED header data }=7tGqfw  
    Dim outFile As String Bn47O~  
    outFile = cDir & sampName & "_FRED.txt" `h :&H,N  
    Open outFile For Output As #1 (!{_O_&  
    Print #1, "type bsdf_data" ]?mWnEi!z  
    Print #1, "format angles=deg bsdf=value scale=1" ZXHG2@E)  
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    'Loop the file list, skip the two header lines and write the remaining data to file nN/v7^^  
    Dim lineArray() As String, curLine As Long op&,&  
    For Each curFile In fList h Sr#/dw&  
        Print "Merging data from file " & curFile rb&^ei9B  
        ReadFile( cDir & curFile, lineArray ) GEIMCg(TRj  
        For curLine = 2 To UBound(lineArray) '-gk))u>)  
            Print #1, lineArray(curLine) %+FM$xyJ  
        Next yBht4"\Al  
    Next uoaF(F-  
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    'Close the output file tkV:kh< L~  
    Close #1 \f0I:%-  
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    Print "Finished merging RPC data for sample " & sampName 9?bfZF4A=  
    Print "FRED formatted data file: " & Chr(9) & outFile C6CX{IA]  
End Sub DQH _@-q  
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'Utility function to read the contents of a file into an array of strings. $* 8c0.{U  
Function ReadFile(ByVal fileName As String, _ Af ^6  
                  ByRef lineArray() As String) As Long {Am\%v\  
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    ReadFile = -1 ^fXNeBj  
    Dim oFSO As Object v?n`kw  
    Set oFSO = CreateObject("Scripting.FileSystemObject") |PDuvv!.f  
    Erase lineArray DT n=WGm)  
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    Dim fid As Long *Rr,ii  
    If oFSO.fileexists( fileName ) Then VXR.2C  
        fid = FreeFile() w&`gx6?-na  
        Open fileName For Input As fid Mwp#.du(  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1S0Hc5vw  
        Close fid tN";o\!}  
    End If D\N-ye1LE  
    Set oFSO = Nothing >UWL T;N/W  
    Return UBound( lineArray ) peR=J7  
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End Function L'"20=sf  
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Sub GetFileList( ByVal in_dir As String, _ Wq F(  
                 ByRef in_flist() As String ) Q3wD6!'&m  
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    'Redimension the file list array ~=Er= 0  
    Erase in_flist u)R>ozER  
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    'Tracks how many files are found `H+ 7Hj  
    Dim fCount As Long /PQg>Pa85  
    fCount = 0 91mXvQ:u  
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    'Recurse directory and search for text files 7$,["cJX  
    Dim f As String P}DrUND  
    f = Dir$(in_dir & "*.txt") Ml+.\'r  
    While f <> "" ~;wSe[  
        ReDim Preserve in_flist(fCount) Wy)|-Q7  
        in_flist(fCount) = f r7JILk  
        fCount += 1 C[n,j#Mvje  
        f = Dir$() j4ypXPY``!  
    Wend xm/v :hl=  
    ReDim Preserve in_flist(fCount-1) 2s?j5 Sd  
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End Sub =qCVy:RL4  
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