首页 -> 登录 -> 注册 -> 回复主题 -> 发表主题
光行天下 -> 讯技光电&黉论教育 -> RPC Photonics扩散片BSDF [点此返回论坛查看本帖完整版本] [打印本页]

infotek 2021-10-26 09:58

RPC Photonics扩散片BSDF

~%lUzabMa  
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
|t"CH'KJZ  
摘要 |WUM=g7PC  
lpPPI+|4N  
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。 /7#MJH5b6  
_KloX{a  
背景 Qu<6X@+5  
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。 ElTB{C>u  
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
>/RFff]Fh0  
)cL(()N  
;HYEJ3  
 &I-T  
步骤 (z;lNl(*C  
y k!K 5  
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。 Yt=)=n  
图2. RPC Photonics工程漫射体不同类型的散射数据
}>y !I5O  
>aVtYp B  
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) !m))Yp-"H  
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 ?=)lbSu K  
例如下所示: dHAT($QG  
Sample name:  EDF-C1-56 D HQxu4  
Merging data from file EDF-C1-56 0-0.txt B T}l"  
Finished merging RPC data for sample EDF-C1-56 #oiU|>3Y  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt [&P @0F n  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
3S#p4{3   
a. 创建一个新的散射库 h$sOJs~6h  
b. 散射模型命名 '+l"zK ]L-  
c. 改变散射模型为“Tabulated BSDF”. J:'_S `J  
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 ) {d#sZT  
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。 #: [F=2@,A  
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, #mJRL[V5^  
g. 点击OK  96;5  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 %R?WkG  
lq.]@zlSO  
*otgI"y\  
脚本代码 ]Hl{(v\H O  
}oiNgs/N  
'#Language "WWB-COM" ' A+L #  
y:Gn58\o  
Option Explicit }^Sk.:;n3  
]8"U)fzmc.  
Sub Main aso8,mpZuA  
7jxx,#I:  
    'Cleanup o+8H:7,o'  
    ClearOutputWindow() )w<Z4_!N4s  
2[=3-1c  
    Print "Merging RPC Photonics BSDF Data Files" 4 7mT  
    SetTextColor(255,0,0) %t6-wWM97  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." kf<c[su  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." RcJtVOrd  
    SetTextColor(0,0,0) mA.,.<xE@  
DC/Czkv9  
    'Current directory of this script (should be the same as the text files being merged) /zXOta G  
    Dim cDir As String 7f k)a  
    cDir = MacroDir$ & "\" P RUl-v  
!U}2YM J  
    'Array which will be populated with the list of files to be merged F =*4] O  
    Dim fList() As String, curFile As String 5|r*,! CF  
    GetFileList( cDir, fList ) .9Cy<z  
F_-xp1|  
    Print "" m3o -p   
    Print "Files found for merging:" zx$1.IM"4  
    For Each curFile In fList j[R.UB3J  
        Print Chr(9) & curFile CLmo%"\ s  
    Next rp"5176  
:JX2GRL4  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. uD?G\"L i  
    Dim nameArray() As String, sampName As String HnjA78%i  
    nameArray = Split(fList(0)," 0-0.txt") "P|n'Mx  
    sampName  = nameArray(0) e-v|  
    Print "" 5y g`TW  
    Print "Sample name: " & Chr(9) & sampName RR:%"4M  
}6.@  
    'Open an output file and write the FRED header data m44a HBwId  
    Dim outFile As String AWMJ/ E*T  
    outFile = cDir & sampName & "_FRED.txt" R@pY+d9qp  
    Open outFile For Output As #1 }@t" B9D  
    Print #1, "type bsdf_data" o9sPyY$aQ  
    Print #1, "format angles=deg bsdf=value scale=1" %GY'pQz  
a:l-cZ/!  
    'Loop the file list, skip the two header lines and write the remaining data to file G{4s~Pco[Q  
    Dim lineArray() As String, curLine As Long 45wtl/^9  
    For Each curFile In fList "@hd\w{.  
        Print "Merging data from file " & curFile ffR%@  
        ReadFile( cDir & curFile, lineArray ) JN9>nC!Zy_  
        For curLine = 2 To UBound(lineArray) .QKyB>s  
            Print #1, lineArray(curLine) }Md;=_TP  
        Next ^<-r57pz  
    Next y9d"sqyh  
*-Yw%uR  
    'Close the output file 6YNL4HE?  
    Close #1 =z"+)N  
d,l?{ Ln  
    Print "Finished merging RPC data for sample " & sampName w$9LcN  
    Print "FRED formatted data file: " & Chr(9) & outFile 3 1-p/  
End Sub I-g/ )2  
0mUVa=)D  
'Utility function to read the contents of a file into an array of strings. M+VWAh#uD  
Function ReadFile(ByVal fileName As String, _ 7p2xst  
                  ByRef lineArray() As String) As Long UQ0<sI=  
*n EkbI/  
    ReadFile = -1 ;9h;oB@  
    Dim oFSO As Object 9-{=m+|b  
    Set oFSO = CreateObject("Scripting.FileSystemObject") <nqv)g"u0  
    Erase lineArray Kf BT'6t  
s^eiym P  
    Dim fid As Long /QyKXg6)l  
    If oFSO.fileexists( fileName ) Then egG<"e*W}N  
        fid = FreeFile() EI 35&7(  
        Open fileName For Input As fid 4RtAwB  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) lD3nz<p  
        Close fid jci,]*X4  
    End If 9>9EZ?4m  
    Set oFSO = Nothing CKK}Z;~:  
    Return UBound( lineArray ) ]nB|8k=J  
jmk Ou5@  
End Function '-RacNY  
=gQ9>An  
Sub GetFileList( ByVal in_dir As String, _ -GCo`PR?b  
                 ByRef in_flist() As String ) @lE'D":?  
?BfE*I$\h  
    'Redimension the file list array c'eZ-\d{  
    Erase in_flist ZzupK^5Z  
2,q*[Kh1  
    'Tracks how many files are found ed q,:  
    Dim fCount As Long 18Y#=uH}  
    fCount = 0 K$M+"#./  
_i+@HXR &  
    'Recurse directory and search for text files <8^x Mjc  
    Dim f As String LQ# E+id&  
    f = Dir$(in_dir & "*.txt") ,u2Qkw  
    While f <> "" tWIJ,_8l  
        ReDim Preserve in_flist(fCount) -<6?ISF2  
        in_flist(fCount) = f Mq Ai}z%  
        fCount += 1 R03 Te gwA  
        f = Dir$() :HO5 T  
    Wend &2`p#riAS  
    ReDim Preserve in_flist(fCount-1)

查看本帖完整版本: [-- RPC Photonics扩散片BSDF --] [-- top --]

Copyright © 2005-2025 光行天下 蜀ICP备06003254号-1 网站统计