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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。 S7fX1y[  
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背景 (uk-c~T!u  
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。 kbHfdA  
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 +YA,HhX9  
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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。 j$u=7Z&E  
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) 4U1!SR]s  
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 |8:IH@K*  
例如下所示: -? |-ux  
Sample name:  EDF-C1-56 x%WL!Lo  
Merging data from file EDF-C1-56 0-0.txt <PayP3E  
Finished merging RPC data for sample EDF-C1-56 X4bB  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt M'"@l $[QM  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 {ejJI/o0  
b. 散射模型命名 U~)i&":sN  
c. 改变散射模型为“Tabulated BSDF”. I5$@1+B  
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 ) qyx  '  
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。 WN+D}z]  
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, uoIvFcb^  
g. 点击OK |1@/gqa  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 v p>,}nx4  
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脚本代码 $<~o,e-4  
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'#Language "WWB-COM" \U0p?wdr:  
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Option Explicit h)MU^aP  
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Sub Main )G a%Eg9  
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    'Cleanup is2OJ,  
    ClearOutputWindow() "i}?jf {a  
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    Print "Merging RPC Photonics BSDF Data Files" Fk(+S:{yQ  
    SetTextColor(255,0,0) 3V,$FS]  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." "'@iDq%y  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 5$(qnOi  
    SetTextColor(0,0,0) |#6B<'e'  
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    'Current directory of this script (should be the same as the text files being merged) z^KMYvH g  
    Dim cDir As String " ^t3VjN  
    cDir = MacroDir$ & "\" g.& n X/  
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    'Array which will be populated with the list of files to be merged .??[qBOTE  
    Dim fList() As String, curFile As String E%?X-$a  
    GetFileList( cDir, fList ) y rSTU-5u  
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    Print "" SnK#YQCDt  
    Print "Files found for merging:" DRo?7 _  
    For Each curFile In fList i #uc  
        Print Chr(9) & curFile W'>"E/Tx#O  
    Next x*Lm{c5+  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 0Y%u[i/  
    Dim nameArray() As String, sampName As String !rK,_wH  
    nameArray = Split(fList(0)," 0-0.txt") yX^/Oc@j  
    sampName  = nameArray(0) #6'x-Z_  
    Print "" rF/k$_bFt  
    Print "Sample name: " & Chr(9) & sampName 9^DXw!  
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    'Open an output file and write the FRED header data {Qe 7/ln!  
    Dim outFile As String hSg4A=y  
    outFile = cDir & sampName & "_FRED.txt" 7j9X<8 *  
    Open outFile For Output As #1 XLog+F$`  
    Print #1, "type bsdf_data" zA~aiX  
    Print #1, "format angles=deg bsdf=value scale=1" MJ=(rp=YU9  
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    'Loop the file list, skip the two header lines and write the remaining data to file sQ4~oZZ  
    Dim lineArray() As String, curLine As Long -f{NVX\<0  
    For Each curFile In fList c" |4'#S  
        Print "Merging data from file " & curFile ai3wSUYJi  
        ReadFile( cDir & curFile, lineArray ) &Z.zem?n  
        For curLine = 2 To UBound(lineArray) #@i1jZ  
            Print #1, lineArray(curLine) 3M?vK(zG>P  
        Next CDNh9`  
    Next 5._=m"Pl  
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    'Close the output file 55mDLiA  
    Close #1 #o(c=  
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    Print "Finished merging RPC data for sample " & sampName eJ=K*t|  
    Print "FRED formatted data file: " & Chr(9) & outFile m(CbMu  
End Sub 3I" <\M4x  
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'Utility function to read the contents of a file into an array of strings. &fyT}M A  
Function ReadFile(ByVal fileName As String, _ &s+F+8"P+  
                  ByRef lineArray() As String) As Long B%.XWW$  
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    ReadFile = -1 f|U J%}$v;  
    Dim oFSO As Object v>4kF _N  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 2l8TX#K  
    Erase lineArray tn"n~;Bh?:  
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    Dim fid As Long !6yyX}%o  
    If oFSO.fileexists( fileName ) Then wva| TZ  
        fid = FreeFile() :~% zX*   
        Open fileName For Input As fid hj8S".A_  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) voD0 u  
        Close fid 4!I;U>b b  
    End If *Dz<Pi^  
    Set oFSO = Nothing bnm3 cR:h"  
    Return UBound( lineArray ) "1-|ahW  
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End Function kOQq+_Y  
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Sub GetFileList( ByVal in_dir As String, _ No'^]r  
                 ByRef in_flist() As String ) aCwb[7N  
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    'Redimension the file list array P+h p'YK1  
    Erase in_flist +1R qo  
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    'Tracks how many files are found TqZ&X| G  
    Dim fCount As Long [h3y8O  
    fCount = 0 3Mw2;.rk  
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    'Recurse directory and search for text files ^EG@tB $<  
    Dim f As String OE"r=is  
    f = Dir$(in_dir & "*.txt") #U=}Pv~wM  
    While f <> "" _F"o0K!u  
        ReDim Preserve in_flist(fCount) v4YY6? 4  
        in_flist(fCount) = f :We}l;.jQ  
        fCount += 1 2f=7`1RCD  
        f = Dir$() Z6`oGFq  
    Wend 4raKhN"  
    ReDim Preserve in_flist(fCount-1)

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