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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。 C$_G'XI !G[f[u4Zg 成像示意图 ?-S8yqe 首先我们建立十字元件命名为Target $':JI#
;Rs.rl>;t/ 创建方法: []=_<]{ bl`D+/V 面1 : Qxky^:B 面型:plane \#2
s4RCji 材料:Air %rw}u"3T 孔径:X=1.5, Y=6,Z=0.075,形状选择Box "R8.P/ 3 y]7%$*
< @ "0uM?_)- 辅助数据: fw:7U%MGv 首先在第一行输入temperature :300K, &M$Bt} < emissivity:0.1; !. p V&g)m.d:n !"`Jqs 面2 : aU4R+.M7@ 面型:plane ^glX1 ) 材料:Air 6N&|2: U 孔径:X=1.5, Y=6,Z=0.075,形状选择Box :q(D(mK WqR7uiCi hRa\1Jt>a 位置坐标:绕Z轴旋转90度, =pyVn_dg k?<i*;7 ?P%|P 辅助数据: ]W+)ee|D El {r$-} 首先在第一行输入temperature :300K,emissivity: 0.1; >n1h^AW k{_1r; C0gfJ~M) Target 元件距离坐标原点-161mm;
\|blRm; lx`q *&E R08&cd#$ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 1E8$% 6VV *B%y`cj| ) sRN!~ 探测器参数设定: u2Y N[|V o
T:j:n 在菜单栏中选择Create/Element Primitive /plane Wux 0RF& J9NsHr:A[ EG%I1F% DQ%`v= ix:2Z- dr.**fGYde 元件半径为20mm*20,mm,距离坐标原点200mm。 Rq"VB.ef&{ 93 [rL+l.Y 光源创建: [TP [+y&HNf 光源类型选择为任意平面,光源半角设定为15度。 ,|6Y\L "pOqd8>] 3T"2S[gT 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。 uijq@yo8- JvKO $^ 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。 j'\>Nn+ d:A\<F Yd[U 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。 pi|\0lH6W 52da]BW< 创建分析面: bh{E&1sLh f+{c1fb>s 0Wjd-rzc, 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。 2=jd;2~ @mvIt hT.4t,wa8 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。 f;e_04K )ZQHa7V FRED在探测器上穿过多个像素点迭代来创建热图 JtSuD>H`" -K:yU4V 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。 S4;wa6 将如下的代码放置在树形文件夹 Embedded Scripts, ,?C|.5 | -JI`!7 c'"#q) 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。 d,zp`S -b].SG5S 绿色字体为说明文字, R
4 DM_u =n> iQS '#Language "WWB-COM" $5ZR[\$ 'script for calculating thermal image map TFAYVK~ 'edited rnp 4 november 2005 es.jh s;vWR^Ll 'declarations P
h9Hg' Dim op As T_OPERATION 1[26w_B3 Dim trm As T_TRIMVOLUME _Ngx$ Dim irrad(32,32) As Double 'make consistent with sampling 3"^a
rK^N Dim temp As Double 3Cq6h;!# Dim emiss As Double h=uiC&B Dim fname As String, fullfilepath As String l R:Ok8e qlz( W 'Option Explicit suA+8}o] 6"BtfQ") Sub Main D=jSh 'USER INPUTS q>Q:X3
nx = 31 L4MxU 2 ny = 31 p>2|| numRays = 1000 |^YzFrc minWave = 7 'microns 5LDQ^n maxWave = 11 'microns *54>iO-
c sigma = 5.67e-14 'watts/mm^2/deg k^4 F% F
c+? fname = "teapotimage.dat" 3$GY,B r^?)F?n! Print "" |
\ s2 Print "THERMAL IMAGE CALCULATION" ;k9
? h$E\2lsE detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 kWzuz# 3!i.Fmo Print "found detector array at node " & detnode KC@k9e k! J4Z${k srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 lcu( "^{3 =gxgS<bde Print "found differential detector area at node " & srcnode 08<k'Oi] i_j9/k GetTrimVolume detnode, trm F Q8RK~?` detx = trm.xSemiApe 7Vz[ji dety = trm.ySemiApe 08TaFzP81 area = 4 * detx * dety Z7tU0 Print "detector array semiaperture dimensions are " & detx & " by " & dety Q'n(^tbL Print "sampling is " & nx & " by " & ny >yV)d/ W&fW5af9 'reset differential detector area dimensions to be consistent with sampling >i^y;5 pixelx = 2 * detx / nx R`0foSq \M pixely = 2 * dety / ny ib5;f0Qa SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 6{JR 0 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 tIn7(C #6Efev 'reset the source power /'8*aUa SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) Uq<a22t@ Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 37j\D1Y an*]62 l 'zero out irradiance array @<@R=aqE For i = 0 To ny - 1 Wrf^O2 For j = 0 To nx - 1 !Z<mrr;T@ irrad(i,j) = 0.0 \Dvl%:8 Next j p9FA_(`^ Next i Bo\a wx]+*Lzz 'main loop sDaT[).Hm EnableTextPrinting( False ) u)q2YLK8 p56KS5duI. ypos = dety + pixely / 2 9%p7B ~}E For i = 0 To ny - 1 EIq{C-( xpos = -detx - pixelx / 2 J6*\>N5W ypos = ypos - pixely "_ PH "W <Um1h:^ EnableTextPrinting( True ) E5,%J Print i <GL}1W"Ay EnableTextPrinting( False ) Zd[y+$> c]AKeq] dXA{+<!! For j = 0 To nx - 1 1M%{Uqsd - U~u6}s]: xpos = xpos + pixelx aH5t.x79b hYP6z^ 'shift source >cwJl@wx- LockOperationUpdates srcnode, True ue6/EN;} GetOperation srcnode, 1, op
rE1np^z7 op.val1 = xpos !uj! op.val2 = ypos Z/V`Z* fy SetOperation srcnode, 1, op LW83Y/7 LockOperationUpdates srcnode, False _Ep{|]:gw >\6jb&,%O raytrace h3UZ|B0= DeleteRays L337/8fh CreateSource srcnode GsP@ B' TraceExisting 'draw @!L@UP0 dK0}% ]i3# 'radiometry zumR( <l For k = 0 To GetEntityCount()-1 |kBg8).B If IsSurface( k ) Then )o
" SB1 temp = AuxDataGetData( k, "temperature" ) .-C+0L1j emiss = AuxDataGetData( k, "emissivity" ) _H^^2#wc/ If ( temp <> 0 And emiss <> 0 ) Then >j(I[_g ProjSolidAngleByPi = GetSurfIncidentPower( k ) haEZp6Z frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ohQz%?r irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 0,vj,ic*WX End If I&'S2=s )M&Azbu End If zn2"swhq\V UZ4tq Next k F?RCaj /H\^l.|vk Next j %mB!|'K% n3HCd-z Next i ((RpT0rP\ EnableTextPrinting( True ) o5*74Mv ,z0~mN 'write out file UijuJ(Tle fullfilepath = CurDir() & "\" & fname QN2*]+/h Open fullfilepath For Output As #1 ;i-D~Np| Print #1, "GRID " & nx & " " & ny &geOFe}R Print #1, "1e+308" -tK;RQYax Print #1, pixelx & " " & pixely 32iWYN Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 xvdnEaWe$ <M=W)2D7 maxRow = nx - 1 z/P^-N> maxCol = ny - 1 ' F 6au[ For rowNum = 0 To maxRow ' begin loop over rows (constant X) $dVgFot row = "" NSiYUAug For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) xdbu|fC row = row & irrad(colNum,rowNum) & " " ' append column data to row string Ol/2%UJXL Next colNum ' end loop over columns jziA;6uL 5JU(@}Db Print #1, row R
uFu,H- %Zl_{Q]h Next rowNum ' end loop over rows RBv= Close #1 9sO{1rF 0-t4+T Print "File written: " & fullfilepath R+ #.bQg Print "All done!!" )K\k6HC. End Sub QX.F1T2e? Be14$7r 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: x%:>Ol RqX4ep5j ?^G$;X7B 找到Tools工具,点击Open plot files in 3D chart并找到该文件 X/;"CM [hv3o0". o{-USUGj7 打开后,选择二维平面图: 6Ymo%OT qRP8dH
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