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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 G11.6]?Gg  
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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。 F>(#Af9  
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背景 #(g+jb0E  
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。 bMOM`At>z  
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 Mr,y|   
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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。 _D,f 4.R  
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) (,c?}TP  
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 q}v04Yy,o  
例如下所示: ww t()  
Sample name:  EDF-C1-56 U3+ _'"  
Merging data from file EDF-C1-56 0-0.txt pQ^,.[[  
Finished merging RPC data for sample EDF-C1-56 wW! r}I#  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt &W<>^C2v  
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 L[Yp\[#-q  
b. 散射模型命名 p6y0W`U  
c. 改变散射模型为“Tabulated BSDF”. mQ60@_"Y=,  
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 ) oT (:33$  
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。 v&b.Q:h*'  
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`&1!t  
g. 点击OK $< K)fbG  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 _Z66[T+M  
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脚本代码 m9<%v0r  
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'#Language "WWB-COM" @f5@0A\0  
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Option Explicit KWh M  
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Sub Main =Q8H]F  
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    'Cleanup %][$y 7  
    ClearOutputWindow() U|Z>SE<k  
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    Print "Merging RPC Photonics BSDF Data Files" /q"d`!h)w  
    SetTextColor(255,0,0) NBqV0>vR  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." $]H=  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." `f 6)Q`n  
    SetTextColor(0,0,0) *)`kx   
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    'Current directory of this script (should be the same as the text files being merged) k BiBXRt  
    Dim cDir As String FSU%?PxO  
    cDir = MacroDir$ & "\" )}Rfa}MD  
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    'Array which will be populated with the list of files to be merged o!=l B fI  
    Dim fList() As String, curFile As String U%^eIXV|  
    GetFileList( cDir, fList ) b%[ nB  
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    Print "" 5Q$r@&qp  
    Print "Files found for merging:" $\,BpZ }3  
    For Each curFile In fList &vFqe,Z  
        Print Chr(9) & curFile q M_/  
    Next 'Uko^R)(  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ,5\2C{  
    Dim nameArray() As String, sampName As String t8DL9RW'  
    nameArray = Split(fList(0)," 0-0.txt") oEQ{m5O9  
    sampName  = nameArray(0) wTlK4R#  
    Print "" 9QH9gdiw  
    Print "Sample name: " & Chr(9) & sampName gv#c~cX]  
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    'Open an output file and write the FRED header data |k`f/*  
    Dim outFile As String ws>WA{]gq  
    outFile = cDir & sampName & "_FRED.txt" b.R!2]T]i^  
    Open outFile For Output As #1 *^@#X-NG  
    Print #1, "type bsdf_data" <Qcex3  
    Print #1, "format angles=deg bsdf=value scale=1" RGl=7^M  
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    'Loop the file list, skip the two header lines and write the remaining data to file ePq13!FC/  
    Dim lineArray() As String, curLine As Long QE 45!Z g  
    For Each curFile In fList 7b&JX'`Mb  
        Print "Merging data from file " & curFile /ojO>Y[<   
        ReadFile( cDir & curFile, lineArray ) =% q?Cr  
        For curLine = 2 To UBound(lineArray) j{{~ZM  
            Print #1, lineArray(curLine) h"%|\o+3  
        Next VqK%^  
    Next F l_dzh,E  
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    'Close the output file \~@[QGKN  
    Close #1 }W:*aU  
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    Print "Finished merging RPC data for sample " & sampName [=F>#8=  
    Print "FRED formatted data file: " & Chr(9) & outFile lAdDu  
End Sub bA@ /B'  
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'Utility function to read the contents of a file into an array of strings. 8K \'Z  
Function ReadFile(ByVal fileName As String, _ < /;Q8;0  
                  ByRef lineArray() As String) As Long f^W[; w  
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    ReadFile = -1 Gb(C#,xbK  
    Dim oFSO As Object .FIt.XPzv  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 1t/dxB;  
    Erase lineArray :/C ?FHs9  
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    Dim fid As Long aO8c h  
    If oFSO.fileexists( fileName ) Then <y@,3DD3A9  
        fid = FreeFile() j5L)N  
        Open fileName For Input As fid N\9}\Rk@  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) q} ]'Q -  
        Close fid <eB<^ &nd  
    End If 3@^MvoC  
    Set oFSO = Nothing ;i<$7MR.e  
    Return UBound( lineArray ) uYFMv=>j  
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End Function *#3*;dya]  
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Sub GetFileList( ByVal in_dir As String, _ 9 YP*f  
                 ByRef in_flist() As String ) s %eyW _  
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    'Redimension the file list array CzYGq  
    Erase in_flist P DRnW  
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    'Tracks how many files are found 81~Kpx  
    Dim fCount As Long b,nn&B5@{  
    fCount = 0 NF6X- ,c d  
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    'Recurse directory and search for text files  l B1#  
    Dim f As String >; aCf#q  
    f = Dir$(in_dir & "*.txt") `/z_rqJ0CL  
    While f <> "" o4$Ott%Wm  
        ReDim Preserve in_flist(fCount) \[:PykS  
        in_flist(fCount) = f c\At0.QCA  
        fCount += 1 l0I}&,+  
        f = Dir$() @.'z* |z  
    Wend BR+nL6sU  
    ReDim Preserve in_flist(fCount-1)

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