首页 -> 登录 -> 注册 -> 回复主题 -> 发表主题
光行天下 -> FRED,VirtualLab -> 十字元件热成像分析 [点此返回论坛查看本帖完整版本] [打印本页]

infotek 2020-11-18 10:58

十字元件热成像分析

简介:本文是以十字元件为背景光源,经过一个透镜元件成像在探测器上,并显示其热成像图。 hhS]wM?B  
X j'7nj  
成像示意图
-nC 5  
首先我们建立十字元件命名为Target R*C  
o9tvf|+z  
创建方法: aS7[s6  
" <GDOL  
面1 : .] S{T  
面型:plane `=]I -5#.W  
材料:Air a]-.@^:_i  
孔径:X=1.5, Y=6,Z=0.075,形状选择Box C ?^si  
gFsnL*L0  
Vd8BQB,Q  
辅助数据: dM A"% R  
首先在第一行输入temperature :300K, g@&@ ]63  
emissivity:0.1; [@Db7]nG  
N"i'[!H%  
s}~'o!}W  
面2 : _;A?w8z  
面型:plane =4;GIiF@  
材料:Air ([-xM%BI6  
孔径:X=1.5, Y=6,Z=0.075,形状选择Box Q~5!c#r  
ty8\@l  
k)2L <Lmn  
位置坐标:绕Z轴旋转90度,  c`'2  
;2m<#~@0  
,{@,dw`lUz  
辅助数据: a\wpJ|3{=T  
LnN6{z{M  
首先在第一行输入temperature :300K,emissivity: 0.1; "}"Bvp^  
oSb,)k@  
VfJbexYT  
Target 元件距离坐标原点-161mm; 0n <t/74  
%8?s3^ o  
EM_`` 0^  
单透镜参数设定:F=100, bend=0, 位置位于坐标原点 \78w1Rkl  
pGZ I697  
{ r9fKA  
探测器参数设定: RVxlN*  
zSYh\g"  
在菜单栏中选择Create/Element Primitive /plane Kn]c4h}@b5  
2:(h17So  
kf3yJP/  
p,y(Fc~]g'  
9zj^\-FA_l  
@v1f)(N  
元件半径为20mm*20,mm,距离坐标原点200mm。 t83n`LC  
0Ywqv)gg  
光源创建: 3pSkk  
e1e2Wk  
光源类型选择为任意平面,光源半角设定为15度。 : "[dr~.  
Wcy N, 5  
0Hz*L,Bh4  
我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 H];QDix?  
[u_-x3`  
我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 PvzB, 2":  
jk0Ja@8PK  
6Xjr0 C+  
功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 & j@i>(7  
SwESDo)  
创建分析面: qDqgU  
M1Jnn4w*d  
q%u;+/|l  
到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 =sG9]a<I  
D0?l$]aE  
QI@!QU$K&  
到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 UR~9*`Z ,  
Z 8??+d=  
FRED在探测器上穿过多个像素点迭代来创建热图 Z3K~C_0Cnu  
e[t+pnRh  
FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 O!!Ne'I  
将如下的代码放置在树形文件夹 Embedded Scripts, tlU&p'  
ER:)Fk>_  
j HT2|VGb*  
打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 X@u-n_  
|V2+4b,  
绿色字体为说明文字, I|=$.i  
sa%2,e'  
'#Language "WWB-COM" L0{ehpvM  
'script for calculating thermal image map ~ #Gu:  
'edited rnp 4 november 2005 :^mfTj$  
YadY?o./  
'declarations wL]7d3t  
Dim op As T_OPERATION Gc) Zu`67  
Dim trm As T_TRIMVOLUME .!kqIx*3  
Dim irrad(32,32) As Double 'make consistent with sampling i[b?W$]7  
Dim temp As Double !$'s?rnh  
Dim emiss As Double Aj06"ep  
Dim fname As String, fullfilepath As String s9 '*Vm  
RHo|&.B;+  
'Option Explicit Yt"&8N]  
J7R+|GTcx  
Sub Main pQaP9Y{OK  
    'USER INPUTS h<oQ9zW)  
    nx = 31 .S&S#}$/]  
    ny = 31 :('7ly!h  
    numRays = 1000 B9;-Blh  
    minWave = 7    'microns /8baJ+D"4\  
    maxWave = 11   'microns L 6){wQ%c  
    sigma = 5.67e-14 'watts/mm^2/deg k^4 ]*+ozAG4  
    fname = "teapotimage.dat" XJ;kyEx3=O  
D/_=rAl1  
    Print "" 8Ua ;< h%  
    Print "THERMAL IMAGE CALCULATION" 'z\K0  
^+:_S9qst  
    detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 )B@veso{  
/ey[cm2#[s  
    Print "found detector array at node " & detnode 6N >ksqo8%  
h3.wR]ut  
    srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 xq',pzN  
e.eQZ5n~q`  
    Print "found differential detector area at node " & srcnode Ue|]M36  
iq`y  
    GetTrimVolume detnode, trm O&93QN0  
    detx = trm.xSemiApe 4NxtU/5-sU  
    dety = trm.ySemiApe VIL #q  
    area = 4 * detx * dety 4.bL>Y>c  
    Print "detector array semiaperture dimensions are " & detx & " by " & dety IMzhEm  
    Print "sampling is " & nx & " by " & ny 2s,wC!',  
;p%a!Im_ <  
    'reset differential detector area dimensions to be consistent with sampling ?\:ysTVu  
    pixelx = 2 * detx / nx |MvCEp  
    pixely = 2 * dety / ny G0$ 1"9u\w  
    SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False Zs!)w9y&V  
    Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 JZ&]"12]fR  
FA\gz?h  
    'reset the source power 2E/#fX9!4  
    SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) @"T_W(i;BI  
    Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 93:s[b mx  
GE=#8-@g~p  
    'zero out irradiance array Owalt4}C  
    For i = 0 To ny - 1 Ftj3`Mu  
        For j = 0 To nx - 1 w5|az6wZB!  
            irrad(i,j) = 0.0 NG@9 }O  
        Next j +u*WUw! %  
    Next i Dm6WSp1|b  
X\\WQxj  
    'main loop 6l IFxc  
    EnableTextPrinting( False ) eFvw9B+  
0mL#8\'"  
    ypos =  dety + pixely / 2 PL<q|y  
    For i = 0 To ny - 1 R% XbO~{u  
        xpos = -detx - pixelx / 2 nK Rx_D$d  
        ypos = ypos - pixely iUqL /  
waXA%u50  
        EnableTextPrinting( True ) 3/o-\wWO  
        Print i kc `Q- N}  
        EnableTextPrinting( False ) <R}(UK  
zLue j'  
)DuOo83n["  
        For j = 0 To nx - 1 t)XNS!6#]?  
RH^8"%\  
            xpos = xpos + pixelx zzy%dc  
m6QlIdl  
            'shift source ,6,#Lc  
            LockOperationUpdates srcnode, True F?e_$\M  
            GetOperation srcnode, 1, op ]1rr$f9  
            op.val1 = xpos dNG>:p  
            op.val2 = ypos #)_4$<P*'  
            SetOperation srcnode, 1, op Z6SM7? d  
            LockOperationUpdates srcnode, False Lm"l*j4  
*nU7v3D  
            'raytrace  V3K  
            DeleteRays @v_ )(  
            CreateSource srcnode mYXe0E#6  
            TraceExisting 'draw em<(wJ-Y  
jR\&2;T  
            'radiometry )(b]-  )  
            For k = 0 To GetEntityCount()-1 AM*V4}s*9k  
                If IsSurface( k ) Then G$:T!  
                    temp = AuxDataGetData( k, "temperature" ) '>_'gR0O  
                    emiss = AuxDataGetData( k, "emissivity" ) HE. `  
                    If ( temp <> 0 And emiss <> 0 ) Then t.c XrX`k  
                        ProjSolidAngleByPi = GetSurfIncidentPower( k ) h djv/  
                        frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 3,e^; {w  
                        irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi [GZ%K`wx  
                    End If vL{sk|2&  
(}vi"mCeW  
                End If $S|bD$e  
i[@*b/A  
            Next k 3J~Q pw0<  
#, W7N_mt  
        Next j )FGm5-K@  
ZJ'#XZpr  
    Next i 5Q,#Co  
    EnableTextPrinting( True ) DG}t!  
I0.{OJ-  
    'write out file 4a00-y='  
    fullfilepath = CurDir() & "\" & fname m^@,0\F  
    Open fullfilepath For Output As #1 O8"kIDr-  
    Print #1, "GRID " & nx & " " & ny i&$L$zf,  
    Print #1, "1e+308" +DaP XZ5.  
    Print #1, pixelx & " " & pixely uj,YCJ8UZs  
    Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 qk{2%,u$@{  
yNi/JM  
    maxRow = nx - 1 qd(C%Wk  
    maxCol = ny - 1 <5rp$AzT  
    For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) 7RM$%'n \  
            row = "" g"c\ouSY  
        For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) xCz(qR  
            row = row & irrad(colNum,rowNum) & " "     ' append column data to row string }&Ngh4/  
        Next colNum                     ' end loop over columns <XiHQ B!  
R$k4}p  
            Print #1, row py VTA1  
<43O,Kx'Su  
    Next rowNum                         ' end loop over rows 1[OCojo<  
    Close #1 Lqq RuKi  
n|sP0,$N1  
    Print "File written: " & fullfilepath x;dyF_*;  
    Print "All done!!" *cz nokq6  
End Sub DKnjmZ:J|  
XdjM/hB{fD  
在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: .w/w] Eq  
S\b[Bq  
<]xGd!x$  
找到Tools工具,点击Open plot files in 3D chart并找到该文件 5RXZ$/  
  
~VYZu=p  
$ OB2ZS"  
打开后,选择二维平面图: XUc(7>k  
W5PNp%+KE  
QQ:2987619807
bYQvh/(J  
查看本帖完整版本: [-- 十字元件热成像分析 --] [-- top --]

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