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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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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。 _^w&k{T  
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背景 N!!=9'fGF  
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。 dD YD6  
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 iOY: a  
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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。 g?B4b7II  
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) _Ns/#Xe/  
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 USd7g Oq(  
例如下所示: Gk:tT1  
Sample name:  EDF-C1-56 *).u:>D4  
Merging data from file EDF-C1-56 0-0.txt T,@s.v  
Finished merging RPC data for sample EDF-C1-56 R&.mNji*  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt CCDU5l$$  
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 $,u>,  
b. 散射模型命名 @*e5(@R  
c. 改变散射模型为“Tabulated BSDF”. C(CwsdlP  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) &?g!)O  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ?}g^/g !  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, QNbV=*F?  
g. 点击OK ,="hI:*<  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 A |u-VXQ  
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脚本代码 r)S:-wP  
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'#Language "WWB-COM" "w&IO}j;=  
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Option Explicit %(&$CmS@  
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Sub Main ~Uw;6VXV1  
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    'Cleanup 3c%_RI.  
    ClearOutputWindow() H2lQ(Y+H  
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    Print "Merging RPC Photonics BSDF Data Files" ]*?lgwE  
    SetTextColor(255,0,0) @yM$Et5  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." &NKb},~  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ~+ kfb^<-  
    SetTextColor(0,0,0)  LXoZ.3S  
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    'Current directory of this script (should be the same as the text files being merged) !mZDukfjQ  
    Dim cDir As String .8wf {y  
    cDir = MacroDir$ & "\" sZx`u+  
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    'Array which will be populated with the list of files to be merged 9;7Gzr6A"  
    Dim fList() As String, curFile As String _?> x{![  
    GetFileList( cDir, fList ) .(RZ&*4  
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    Print "" KFg q3snH  
    Print "Files found for merging:" ''dS {nQs  
    For Each curFile In fList OxQ5P;O  
        Print Chr(9) & curFile ]"/SU6#4:  
    Next 1etT."  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. EXMW,  
    Dim nameArray() As String, sampName As String qjObu\r  
    nameArray = Split(fList(0)," 0-0.txt") STl8h}C  
    sampName  = nameArray(0) H#i,Ve '  
    Print "" Z`_x|cU?J  
    Print "Sample name: " & Chr(9) & sampName s"@}^ )*}  
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    'Open an output file and write the FRED header data qt(4?_J  
    Dim outFile As String =r4sF!g  
    outFile = cDir & sampName & "_FRED.txt" +BeA4d8b  
    Open outFile For Output As #1 Pbd[gKX_  
    Print #1, "type bsdf_data" A9lw^.  
    Print #1, "format angles=deg bsdf=value scale=1" Wv|CJN;4  
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    'Loop the file list, skip the two header lines and write the remaining data to file {#st>%i  
    Dim lineArray() As String, curLine As Long -AD@wn!wCJ  
    For Each curFile In fList Zs(BViTb|  
        Print "Merging data from file " & curFile ^k*%`iQ  
        ReadFile( cDir & curFile, lineArray ) E[WU  
        For curLine = 2 To UBound(lineArray) OK)>QGl  
            Print #1, lineArray(curLine) g$ HL::  
        Next eL>wKu:r  
    Next e^em^1H( %  
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    'Close the output file vf zC2  
    Close #1 Nyt*mbd5 {  
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    Print "Finished merging RPC data for sample " & sampName fF(AvMsO  
    Print "FRED formatted data file: " & Chr(9) & outFile _CPj] m{  
End Sub m.rV1#AI  
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'Utility function to read the contents of a file into an array of strings. Mq#m;v$E  
Function ReadFile(ByVal fileName As String, _ mKjTJzS  
                  ByRef lineArray() As String) As Long Z^]jy>dj  
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    ReadFile = -1 %%|pJ%}Q>  
    Dim oFSO As Object =@ acg0  
    Set oFSO = CreateObject("Scripting.FileSystemObject") e]nP7TIU  
    Erase lineArray +.&P$`;TZj  
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    Dim fid As Long >;XtJJS  
    If oFSO.fileexists( fileName ) Then }]H7uC!t   
        fid = FreeFile() 8!0fT}  
        Open fileName For Input As fid ^, YTQ.O  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) (u ^8=#  
        Close fid J90:c@O"w  
    End If ^\g.iuE  
    Set oFSO = Nothing  71@kIJI  
    Return UBound( lineArray ) qSlo)aP  
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End Function z{&Av  
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Sub GetFileList( ByVal in_dir As String, _ F53 .g/[  
                 ByRef in_flist() As String )  pdm(7^  
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    'Redimension the file list array unc6 V%  
    Erase in_flist [<5/s$,i  
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    'Tracks how many files are found  ZB |s/  
    Dim fCount As Long A9N8Hav  
    fCount = 0 4i.&geX A.  
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    'Recurse directory and search for text files )5n0P Zi  
    Dim f As String P5h*RV>oS  
    f = Dir$(in_dir & "*.txt") 2+I5VPf  
    While f <> "" Iila|,cM  
        ReDim Preserve in_flist(fCount) pY-!NoES  
        in_flist(fCount) = f BKO^ux%  
        fCount += 1 N<@K(? '  
        f = Dir$() rz,,ku4qt  
    Wend dl[%C6  
    ReDim Preserve in_flist(fCount-1)

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