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infotek 2021-10-26 09:58

RPC Photonics扩散片BSDF

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RPC Photonics扩散片BSDF
时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印
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摘要 Q*TxjE7K  
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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。 !$q1m@K1  
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背景 l<<G". ?  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 2|k*rv}l  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 *$(=I6b  
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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。 (4V1%0  
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) ;{|a~e?Y  
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 JxQwxey{  
例如下所示: 7YbI|~  
Sample name:  EDF-C1-56 l,/q# )5[  
Merging data from file EDF-C1-56 0-0.txt hMJ \a  
Finished merging RPC data for sample EDF-C1-56 [BhpfZNKRA  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Y6A]dk  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 bcpH|}[F)  
b. 散射模型命名 , IUMH]D  
c. 改变散射模型为“Tabulated BSDF”. /3%]Ggwe  
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 ) *9^CgLF  
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。 4x'^?0H@  
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, mxHNK4/  
g. 点击OK v>3ctP {  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 9\)NFZ3Mz  
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脚本代码 `n-e.{O((  
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'#Language "WWB-COM" #py7emu  
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Option Explicit z@y* jT  
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Sub Main | 7>1)  
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    'Cleanup xSb/9 8;  
    ClearOutputWindow() 5d}PrYa  
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    Print "Merging RPC Photonics BSDF Data Files" dab>@z4  
    SetTextColor(255,0,0) 3:Co K#  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." e;3$7$n Pv  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ,h/0:?R KW  
    SetTextColor(0,0,0) glHag"(  
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    'Current directory of this script (should be the same as the text files being merged) 4BEVG&Ks  
    Dim cDir As String mKpUEJ<a  
    cDir = MacroDir$ & "\" |r-<t  
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    'Array which will be populated with the list of files to be merged QHs=Zh;"  
    Dim fList() As String, curFile As String N83RsL "}_  
    GetFileList( cDir, fList ) d+T]EpQJ*  
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    Print "" $Z28nPd/  
    Print "Files found for merging:" uFdSD  
    For Each curFile In fList 6\o.wq  
        Print Chr(9) & curFile 1Y9Ye?~jd  
    Next <2cq 0*$  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. UjKHGsDi4  
    Dim nameArray() As String, sampName As String N[pk@M\vX  
    nameArray = Split(fList(0)," 0-0.txt") OD1ns  
    sampName  = nameArray(0) 6l_8Q w*5I  
    Print "" R&xD|w8UjM  
    Print "Sample name: " & Chr(9) & sampName hChM hc  
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    'Open an output file and write the FRED header data g"Ii'JZ?  
    Dim outFile As String 3al5Vu2:  
    outFile = cDir & sampName & "_FRED.txt" CKBi-q FH  
    Open outFile For Output As #1 %Vt@7SwRJ  
    Print #1, "type bsdf_data" G~esSL^G/  
    Print #1, "format angles=deg bsdf=value scale=1" &H4UVI  
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    'Loop the file list, skip the two header lines and write the remaining data to file wG{o bsL.!  
    Dim lineArray() As String, curLine As Long G,"$Erx  
    For Each curFile In fList W' 2)$e  
        Print "Merging data from file " & curFile O_iX 1@SW  
        ReadFile( cDir & curFile, lineArray ) ;%k%AXw  
        For curLine = 2 To UBound(lineArray) 4x C0Aw  
            Print #1, lineArray(curLine) JnsXEkM)  
        Next VR:b1XWX  
    Next WG}QLcP  
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    'Close the output file 0~S<}N  
    Close #1 nVM`&azD  
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    Print "Finished merging RPC data for sample " & sampName AT9SD vJ  
    Print "FRED formatted data file: " & Chr(9) & outFile [&`>&u@MK  
End Sub cEQa 6  
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'Utility function to read the contents of a file into an array of strings. pF !vW  
Function ReadFile(ByVal fileName As String, _ x)U;  
                  ByRef lineArray() As String) As Long g1{wxBFE  
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    ReadFile = -1 L"-&B$B:  
    Dim oFSO As Object %4-pw|':  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 'Qfy+_0  
    Erase lineArray v4.V%tg!  
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    Dim fid As Long HZ}'W<N  
    If oFSO.fileexists( fileName ) Then {r}}X@|5  
        fid = FreeFile() >WEg8'#O  
        Open fileName For Input As fid 7>mYD3  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) *Xnq1_K}  
        Close fid 52 A=c1kb  
    End If 1 `AE]  
    Set oFSO = Nothing h ,n!x:zy@  
    Return UBound( lineArray ) 68>zO %  
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End Function 3//v{ce1]  
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Sub GetFileList( ByVal in_dir As String, _ 24Tw1'mW  
                 ByRef in_flist() As String ) ujh4cp  
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    'Redimension the file list array %jf gncW  
    Erase in_flist 'ng/A4  
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    'Tracks how many files are found iTvCkb48m  
    Dim fCount As Long H}~^,B2;  
    fCount = 0 qprOxP r  
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    'Recurse directory and search for text files }.vy|^X  
    Dim f As String ZM.g +-9  
    f = Dir$(in_dir & "*.txt") ZSSgc0u^?  
    While f <> "" R}Y=!qjYE=  
        ReDim Preserve in_flist(fCount) F{+`F<r  
        in_flist(fCount) = f "8]170  
        fCount += 1 J)-> 7h =  
        f = Dir$() "F}Ip&]hAG  
    Wend FHC7\#p/9Z  
    ReDim Preserve in_flist(fCount-1)

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