| 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。 m- %E-nr xVf|G_5$
成像示意图 a_[Eh fE 首先我们建立十字元件命名为Target &LmJ!^# ?# Mr 创建方法: T!-\@PB !
jPC[_g 面1 : H;D>|q 面型:plane 00<cYy 材料:Air @v$Y7mw3D 孔径:X=1.5, Y=6,Z=0.075,形状选择Box efSM`!%j ZWii)0'PV
K}2Erm%A@y 辅助数据: $[9%QQk5<L 首先在第一行输入temperature :300K, LnFdhrB@x emissivity:0.1; eiuSvyY t![7uU.W tN[L@t9#cr 面2 : `^91%f 面型:plane V@\gS"Tu 材料:Air Xk:OL,c 孔径:X=1.5, Y=6,Z=0.075,形状选择Box c4!^nk] g(nPQOs$u zuP B6W ^ 位置坐标:绕Z轴旋转90度, LO'**}vm #:%&x@@c3P
rjl`&POqc 辅助数据: @(l^]9(V\ y9_V 首先在第一行输入temperature :300K,emissivity: 0.1; -Btk 3 Z<U6<{b '#!
gh? Target 元件距离坐标原点-161mm; "B8Q: K*\'.~[6
yhlFFbU 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 c@YI;HS_g "-y-iJ wWgWWXGT} 探测器参数设定: k2E0/ @f{k "vA}FV%tRq 在菜单栏中选择Create/Element Primitive /plane s.EI`*xylY O[# 27_dH
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.u"sh] 元件半径为20mm*20,mm,距离坐标原点200mm。 WJ)z6m] CF&NFSti^ 光源创建: ,/[6e\0~ h"lX4 光源类型选择为任意平面,光源半角设定为15度。 QpZ:gM_ =5aDM\L$& EQ2#/> 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 jNe`;o "rTQG6` 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 %?LOs
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>),8 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 ^<;V]cY` .#wqXRd 创建分析面: uB |Ss Vw[ 6t>` Mc#*wEo)8 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 a5 *2h{i o5xAav"+>
YNYx>Ue 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 !
N|0x` 4!$s}V=6 FRED在探测器上穿过多个像素点迭代来创建热图 NxSu3e~PS :z}MIuf 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。 N03G>fZ 将如下的代码放置在树形文件夹 Embedded Scripts, F1 iGMf-8 h H <J,Wn
Nb?w|Ne(T 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。 @vpf[j (Lo%9HZ1Mx 绿色字体为说明文字, ~i@Y|38C qe #P?[ '#Language "WWB-COM" g wz7krUTe 'script for calculating thermal image map ]"+95*B 'edited rnp 4 november 2005 CQZgMY1{ b'P eH\h{ 'declarations XIvn_&d;G Dim op As T_OPERATION Jwj%_< Dim trm As T_TRIMVOLUME ktK_e Dim irrad(32,32) As Double 'make consistent with sampling (&&4J{`W9 Dim temp As Double *o-.6OxZ$ Dim emiss As Double PpV'F[|,r Dim fname As String, fullfilepath As String qZ]pq2G 1h>yu3O 'Option Explicit .udv"?!z $k0kk Sub Main "+\ lws 'USER INPUTS Z?pnj8h-& nx = 31 7~&/_3 ny = 31 ,REJt numRays = 1000 a,3j,(3 minWave = 7 'microns tyfTU5"x maxWave = 11 'microns {*[\'!d--. sigma = 5.67e-14 'watts/mm^2/deg k^4 R-NS,i={ fname = "teapotimage.dat" ]V-W~r= HQ|MhM/" Print "" I+Jm>XN Print "THERMAL IMAGE CALCULATION" o HMo>*? jAy^J(+ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 Jo$G,Q \=+b}mKV
m Print "found detector array at node " & detnode 53c 0
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H srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 N+LL@[ DVah Print "found differential detector area at node " & srcnode W3D c r@Dy n8uv#DsdK GetTrimVolume detnode, trm SF}<{x_ detx = trm.xSemiApe O:TlIJwW dety = trm.ySemiApe #?*WPq area = 4 * detx * dety !_+8A/ Print "detector array semiaperture dimensions are " & detx & " by " & dety S{FROC~1R Print "sampling is " & nx & " by " & ny *?y+e F6o_b4l 'reset differential detector area dimensions to be consistent with sampling `6 /$M!4$ pixelx = 2 * detx / nx !:|TdYrmj pixely = 2 * dety / ny TT50(_8 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False B;R.# ^@/ Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 W?0 lV5/ j=*l$RG 'reset the source power t<T[h2Wd SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) U7!.,kR- Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" AS E91T~ "jTKSgv+q5 'zero out irradiance array /&CmO>^e For i = 0 To ny - 1
c1$ngH0 For j = 0 To nx - 1 ~/ 8M 3k/ irrad(i,j) = 0.0 $U$V?xuE Next j VR+<v Next i Z|_K6v/c eh4gQ^l 'main loop ,ldI2] EnableTextPrinting( False ) !(n4|Wd q(zJ%Gv) ypos = dety + pixely / 2 %1.]c6U For i = 0 To ny - 1 U~}
U\_ xpos = -detx - pixelx / 2 ~XyW&@ ypos = ypos - pixely MZTx:EN! R)M_|ca EnableTextPrinting( True ) )I^2k4Cg" Print i Y4cYZS47 EnableTextPrinting( False ) f;&]:2.j !L;\cl ] GHt" For j = 0 To nx - 1 UOGuqV- r'dr9"-{ xpos = xpos + pixelx j4>a( qw7@(R'" 'shift source JCPUM*g8 LockOperationUpdates srcnode, True *[r! GetOperation srcnode, 1, op !@x+q)2 op.val1 = xpos -29gL_dk. op.val2 = ypos oEx\j+}@n SetOperation srcnode, 1, op :9R=]#uD LockOperationUpdates srcnode, False :}h>by= ]J* ,g, 'raytrace 6\u!E~zy DeleteRays b{d4xU8' CreateSource srcnode kaxvPv1
TraceExisting 'draw oT{@_U{*J E,wVe[0)f 'radiometry l"q1?kaVg For k = 0 To GetEntityCount()-1 3#vinz If IsSurface( k ) Then [97KBoSU temp = AuxDataGetData( k, "temperature" ) RrhT'':[ emiss = AuxDataGetData( k, "emissivity" ) 28hHabd| If ( temp <> 0 And emiss <> 0 ) Then ari7 iF~j ProjSolidAngleByPi = GetSurfIncidentPower( k ) 4EXB;[] frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ;>%~9j1C irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi =\,uy8HX End If g
^!C j}BHj.YuP End If 65oWD- ]Ni;w]KE Next k &f>eQS=( p1D[YeF4 Next j xr qv@/kJ IcrL Next i &m {kHM EnableTextPrinting( True ) V $|< 'JdkUhq1V 'write out file :^'O}2NP fullfilepath = CurDir() & "\" & fname T#
lP!c Open fullfilepath For Output As #1 FZ|CqD"# Print #1, "GRID " & nx & " " & ny dl5=q\1= Print #1, "1e+308" nx:KoB"ny Print #1, pixelx & " " & pixely ckjrk Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 2oZ9laJO e8h,,:l3j maxRow = nx - 1 YB)3X[R+0 maxCol = ny - 1 E RdL^T> For rowNum = 0 To maxRow ' begin loop over rows (constant X) g7CXlT0Q6 row = "" BPqGJ7@ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) x1gx$P row = row & irrad(colNum,rowNum) & " " ' append column data to row string #5&jt@NS Next colNum ' end loop over columns -h-oMqgu( 1|ZhPsD.}g Print #1, row 3L_I[T$s 1/ZR*fa Next rowNum ' end loop over rows C#i UP|7hh Close #1 w?mEuXc joa5|t!D9 Print "File written: " & fullfilepath dQgk.k Print "All done!!" \OC6M` / End Sub Te{ *6-gO3 pi@Xkw 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: y^Vw`-e zTo8OPr Aaw(Ed 找到Tools工具,点击Open plot files in 3D chart并找到该文件 J^m<* q
(+ZwaV@ "R9Yb,tIN 打开后,选择二维平面图: h?UVDzI!O ~%#mK:+
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