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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 %}< e;t-O  
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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。 CcF$?07 i  
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背景 n-HQk7=mQ  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 e_eNtVq  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 1|]IWX|  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 {2|[7oNT6  
图2. RPC Photonics工程漫射体不同类型的散射数据
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) uc0 1{t0,  
3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 HR.^ y$IE  
例如下所示: Z%h _g-C  
Sample name:  EDF-C1-56 MCPVql`+`q  
Merging data from file EDF-C1-56 0-0.txt |rjHH<  
Finished merging RPC data for sample EDF-C1-56 -4rXOmiA  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt +XaRwcLC.  
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 Y]zy=8q  
b. 散射模型命名 (8Q0?SZN  
c. 改变散射模型为“Tabulated BSDF”. :htz]  
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 ) wiwAdYEQ\  
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。 @W4tnM,#  
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, ]lT8Z-h@  
g. 点击OK we4k VAn  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 gD13(G98  
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脚本代码 Y/%(4q*'  
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'#Language "WWB-COM" q <, b  
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Option Explicit >MTrq%.  
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Sub Main QR ?JN\%?  
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    'Cleanup m;_gNh8Ee  
    ClearOutputWindow() @r.w+E=  
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    Print "Merging RPC Photonics BSDF Data Files" Fjs:rZ#{  
    SetTextColor(255,0,0) Q)/V >QW  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." m1 tYDZ"i  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." %9 q]  
    SetTextColor(0,0,0) Io(*_3V)B  
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    'Current directory of this script (should be the same as the text files being merged) gwA+%]  
    Dim cDir As String EJCf[#Sf  
    cDir = MacroDir$ & "\" 3j I rB%  
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    'Array which will be populated with the list of files to be merged yb-1zF|  
    Dim fList() As String, curFile As String Jw 4#u5$$Z  
    GetFileList( cDir, fList ) wV604eO(  
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    Print "" & t.G4  
    Print "Files found for merging:" rN3qTp  
    For Each curFile In fList ,+d\@:  
        Print Chr(9) & curFile )Ja&Y  
    Next 9a6ij*#  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. n@JZ2K4  
    Dim nameArray() As String, sampName As String *=2sXH1j  
    nameArray = Split(fList(0)," 0-0.txt") f?qp*  
    sampName  = nameArray(0) Irc(5rD7   
    Print "" +W%3VV$  
    Print "Sample name: " & Chr(9) & sampName b2tUJ2p  
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    'Open an output file and write the FRED header data G%HuB5:u  
    Dim outFile As String x+;a2yE~  
    outFile = cDir & sampName & "_FRED.txt" 7'g{:dzS*3  
    Open outFile For Output As #1 61@;3yV  
    Print #1, "type bsdf_data" sQXj?5!  
    Print #1, "format angles=deg bsdf=value scale=1" rRQKW_9mB  
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    'Loop the file list, skip the two header lines and write the remaining data to file A<U9$"j9J  
    Dim lineArray() As String, curLine As Long \C}_l+nY  
    For Each curFile In fList lVYrP|#  
        Print "Merging data from file " & curFile 8#{DBWU  
        ReadFile( cDir & curFile, lineArray ) *}P=7TuS  
        For curLine = 2 To UBound(lineArray) S]x\Asj;w  
            Print #1, lineArray(curLine) ls@j8bVv^  
        Next J Q% D6b  
    Next V{{Xz:   
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    'Close the output file 6ec#3~ Y]  
    Close #1 9 S4bg7  
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    Print "Finished merging RPC data for sample " & sampName 1=Z, #r  
    Print "FRED formatted data file: " & Chr(9) & outFile NVX@1}  
End Sub >X_5o^s2s  
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'Utility function to read the contents of a file into an array of strings. 0}3Xry,{  
Function ReadFile(ByVal fileName As String, _ KK';ho,W  
                  ByRef lineArray() As String) As Long '/'dg5bfV  
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    ReadFile = -1 asZ(Hz%  
    Dim oFSO As Object P^57a?[`  
    Set oFSO = CreateObject("Scripting.FileSystemObject") d` X1cG  
    Erase lineArray ?0x=ascP  
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    Dim fid As Long z=6zc-$y 9  
    If oFSO.fileexists( fileName ) Then l{mC|8X  
        fid = FreeFile() ( u^`3=%n  
        Open fileName For Input As fid  ae>B0#=  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) WyU\,"  
        Close fid =mYwO=:D  
    End If U BWUq  
    Set oFSO = Nothing z'9U.v'M)  
    Return UBound( lineArray ) 2_Gb K-  
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End Function s# V>+mU  
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Sub GetFileList( ByVal in_dir As String, _ }0}=-g&  
                 ByRef in_flist() As String ) Dnp><%  
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    'Redimension the file list array mu{\_JX.A  
    Erase in_flist hf\/2Vl  
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    'Tracks how many files are found uI\6":/u  
    Dim fCount As Long R.Kz nJ  
    fCount = 0 PY MofQaZ  
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    'Recurse directory and search for text files UuCRQNH  
    Dim f As String lx<!*2 -^  
    f = Dir$(in_dir & "*.txt") 0{(5J,/BF  
    While f <> "" z#B(1uI  
        ReDim Preserve in_flist(fCount) ^#!\VGnL  
        in_flist(fCount) = f 8`z  
        fCount += 1 6xLQ  
        f = Dir$() >BZ,g!N,J}  
    Wend C@WdPjxj  
    ReDim Preserve in_flist(fCount-1)

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