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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 /<T{g0s  
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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。 ImB5F'HI$  
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背景 5,4" CF$  
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。 S3HyB b  
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 8H};pu2  
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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。 !} x-o`a5  
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) %b_0l<+  
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 2H8\P+  
例如下所示: 4yTgH0(T  
Sample name:  EDF-C1-56 Ed0}$ b  
Merging data from file EDF-C1-56 0-0.txt 8.wtv5eZ  
Finished merging RPC data for sample EDF-C1-56 mg._c  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ,V5fvHPH)8  
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 <M5fk?n,|  
b. 散射模型命名 a)S6Z  
c. 改变散射模型为“Tabulated BSDF”. <ir]bQT  
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 ) Xep2 )3k>  
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。 q l5&&e=-  
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, >*B59+1P  
g. 点击OK *e:I*L  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 'bH~KK5  
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脚本代码 A ^hafBa  
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'#Language "WWB-COM" k=p[Mlic/  
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Option Explicit * _usVg  
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Sub Main u^'X>n)oL#  
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    'Cleanup yZoJD{'?Sw  
    ClearOutputWindow() 9zx9t  
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    Print "Merging RPC Photonics BSDF Data Files" GKUjtPu  
    SetTextColor(255,0,0) P%R9\iajH  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." [\fwnS_1  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 7#Fcn  
    SetTextColor(0,0,0) BSr#;;\  
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    'Current directory of this script (should be the same as the text files being merged) 'vq0Tw5  
    Dim cDir As String 23ho uS   
    cDir = MacroDir$ & "\" QAl4w)F  
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    'Array which will be populated with the list of files to be merged X4'!:&  
    Dim fList() As String, curFile As String F]N?_ bo  
    GetFileList( cDir, fList ) i&)([C0z$  
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    Print "" i3L2N~:V  
    Print "Files found for merging:" 2zv:j7  
    For Each curFile In fList JXt_  
        Print Chr(9) & curFile ^e\$g2).  
    Next Ne3YhCC>  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?} E M,  
    Dim nameArray() As String, sampName As String y5^OD63s  
    nameArray = Split(fList(0)," 0-0.txt") Tgla_sMb  
    sampName  = nameArray(0) 8NNs_~+x}  
    Print "" 8aM\B%NGWi  
    Print "Sample name: " & Chr(9) & sampName Azr|cKu]  
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    'Open an output file and write the FRED header data Pv)^L  
    Dim outFile As String 5xj8^W^G9  
    outFile = cDir & sampName & "_FRED.txt" S|6i]/  
    Open outFile For Output As #1 ~GJ;;v1b2  
    Print #1, "type bsdf_data" S$40nM  
    Print #1, "format angles=deg bsdf=value scale=1" (m2_Eh;  
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    'Loop the file list, skip the two header lines and write the remaining data to file LU@1Gol  
    Dim lineArray() As String, curLine As Long M*Q}^<E*  
    For Each curFile In fList k#/cdK!K  
        Print "Merging data from file " & curFile SY@;u<Pd   
        ReadFile( cDir & curFile, lineArray ) :}#j-ZCC"  
        For curLine = 2 To UBound(lineArray) Z@*!0~NH=4  
            Print #1, lineArray(curLine) '|Lv -7  
        Next U1 rr=h g  
    Next k f|J  
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    'Close the output file .SSyW{a3w  
    Close #1 (WY9EJ<s,  
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    Print "Finished merging RPC data for sample " & sampName N K@6U_/W  
    Print "FRED formatted data file: " & Chr(9) & outFile t0/Ol'kgs  
End Sub 'V <ZmJ2  
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'Utility function to read the contents of a file into an array of strings. :v$)Z~  
Function ReadFile(ByVal fileName As String, _ */@I$*  
                  ByRef lineArray() As String) As Long XW^Pz (  
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    ReadFile = -1 VP~%,=  
    Dim oFSO As Object O@dK^o  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 4+p1`  
    Erase lineArray -H|!KnR  
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    Dim fid As Long _)YB*z5  
    If oFSO.fileexists( fileName ) Then VpY,@qh  
        fid = FreeFile() n!Y}D:6c6  
        Open fileName For Input As fid $ )2zz>4  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) `fG<iBD  
        Close fid gv(MX ;B#  
    End If ];=|))ky"  
    Set oFSO = Nothing DFRgn  
    Return UBound( lineArray ) i3$G)W  
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End Function )Q}Q -Zt  
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Sub GetFileList( ByVal in_dir As String, _ T@zp'6\H  
                 ByRef in_flist() As String ) 8f%OPcr&  
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    'Redimension the file list array \.P#QVuQ  
    Erase in_flist v v5rA 6+  
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    'Tracks how many files are found LFYSur8  
    Dim fCount As Long  s%5XBI  
    fCount = 0 $kkL)O*"]  
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    'Recurse directory and search for text files 4V mUTMY  
    Dim f As String W,!7_nl"u  
    f = Dir$(in_dir & "*.txt") [`bK {Dq2  
    While f <> "" I9#l2<DYlX  
        ReDim Preserve in_flist(fCount) 28- z  
        in_flist(fCount) = f q$ j  
        fCount += 1 Tn\{*A  
        f = Dir$() Z;0<k;#T(p  
    Wend k!6m'}v  
    ReDim Preserve in_flist(fCount-1)

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