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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。 :3M2zV
cf U8KB@E 成像示意图 z 0]K:YV_ 首先我们建立十字元件命名为Target
AC@WhL 3zo]*6p0 创建方法: 8Eyi`~cAiH U:ggZ`. 面1 : 2F[smUL 面型:plane @,F8gv* 材料:Air 9>\P]: 孔径:X=1.5, Y=6,Z=0.075,形状选择Box "Kx2k>ym GoP,_sd\O +dw$IMwb 辅助数据: RO+B/)~0< 首先在第一行输入temperature :300K, zZ&L# emissivity:0.1; `,gGmh -B-?z?+(O REUWK#> 面2 : ifTMoC% 面型:plane i_Dv+^&zV 材料:Air r|wB&
PGW 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Ca?5bCI, 23 j{bK 7p%W)=v 位置坐标:绕Z轴旋转90度, ^-?5=\`5 .}n, xdb9oH 辅助数据: ,#3u.=IR[ mX3~rK>@~ 首先在第一行输入temperature :300K,emissivity: 0.1; M3c!SXx\ F(c~D0 eIBHAdU+g/ Target 元件距离坐标原点-161mm; 8.FBgZh* Pw
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i;~9'Q 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ~CiVLSH= D%GB2-j R F4'g}yOLd 探测器参数设定: }1E'a>^| g"v g
{Q 在菜单栏中选择Create/Element Primitive /plane 7OY<*ny ^HYmi\` /z:pid,_0 b*Ny ],CJSA!5F ;AMbo`YK[ 元件半径为20mm*20,mm,距离坐标原点200mm。 eAKK uML d\Cx(Lb[ 光源创建: 4Kjrk7GAx EV{kd.=f 光源类型选择为任意平面,光源半角设定为15度。 1cPm $=B ;/+VHZP; mi9B C9W( 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 8:^`rw4a0 QWVH4rg 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 "^E/N},%u5 ?mKj+Bk2 3]xe7F'` 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 [=M0%" Lt ;!q b. 创建分析面: / *3[9, ^9*FYV %zj;~W;qPH 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 i(DoAfYf/q &'`q&U1x VK\ Bjru9 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 5sJi- ^ ngF5ywIG FRED在探测器上穿过多个像素点迭代来创建热图 @y:mj \J9 6&/H
XqP FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 BDoL)}bRE 将如下的代码放置在树形文件夹 Embedded Scripts, Z#7T!/28 W+k`^A|@ {!5"Y(>X 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 i*34/ Z-(#}(HD 绿色字体为说明文字, N<c98 Eq$Q%'5*ua '#Language "WWB-COM" ly`p)6#R= 'script for calculating thermal image map tY$
.(2Ua 'edited rnp 4 november 2005 p&1IK8i" S%KY%hUt 'declarations n{vp& Dim op As T_OPERATION i!
G^=N Dim trm As T_TRIMVOLUME vqh@)B+) Dim irrad(32,32) As Double 'make consistent with sampling J u5<wjQR\ Dim temp As Double |rJ1/T.9 Dim emiss As Double &8!*u3 Dim fname As String, fullfilepath As String !(\OT dhl[JC~ _ 'Option Explicit `P1jg$(eA _r!''@B Sub Main A:Y]<jt 'USER INPUTS oXw} K((| nx = 31 {l&6=z ny = 31 <3\t J numRays = 1000 pT Yq#9 minWave = 7 'microns #6g-{OBv maxWave = 11 'microns #PYTFB% sigma = 5.67e-14 'watts/mm^2/deg k^4 =XWew* fname = "teapotimage.dat" cJ9:XWW HfN-WYiR Print "" kIS&! V Print "THERMAL IMAGE CALCULATION" Xh==F:
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fmT detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 Hb&-pR@e\? 0gNwC~IA8 Print "found detector array at node " & detnode _Y@'<S. [
bv>(a_, srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 51.! S J;+AG^U< Print "found differential detector area at node " & srcnode 77/&M^0 ]p3hq1u3& GetTrimVolume detnode, trm x7$U detx = trm.xSemiApe *yAC8\v dety = trm.ySemiApe 2!QS&i area = 4 * detx * dety ,=KJ7zIK? Print "detector array semiaperture dimensions are " & detx & " by " & dety @W3fKF9*R Print "sampling is " & nx & " by " & ny >W2Z]V
C[ <OF/ 'reset differential detector area dimensions to be consistent with sampling ]X4
A)4y pixelx = 2 * detx / nx ;w1?EdaO pixely = 2 * dety / ny x9r5 ;5TI SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False Nx4_Oc^hY Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 .E:QZH' M v ?@Ys+V 'reset the source power \~ O6S`, SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) cWIX!tc8 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" kJIKULf ;zI;oY#.y 'zero out irradiance array |YjuaXd7N For i = 0 To ny - 1 YIs (Q
For j = 0 To nx - 1 rC~hjViG. irrad(i,j) = 0.0 rlu{C4l Next j NC::;e Next i Tysh~C|1 mj :8ZZ 'main loop cw#p!mOi~ EnableTextPrinting( False ) _QCspPT' c s$xctIbm?, ypos = dety + pixely / 2 $oK,&_ For i = 0 To ny - 1 }8 A] xpos = -detx - pixelx / 2 7]a6dMh ypos = ypos - pixely ==I:>+_^| o2? [*pa EnableTextPrinting( True ) z<_{m4I; Print i qNER 6 EnableTextPrinting( False ) h
&9Ld:p R7cY$K{j (A`/3Aq+ For j = 0 To nx - 1 8^ju= Fc>W]1 xpos = xpos + pixelx Sj{z %,%s09tO 'shift source g':mM*j& LockOperationUpdates srcnode, True kV"';a GetOperation srcnode, 1, op m *8[I op.val1 = xpos ,eD@)K_: op.val2 = ypos 7~TE=t SetOperation srcnode, 1, op Q(gu";& LockOperationUpdates srcnode, False yNdtq\h LKY4rY!|@d raytrace JE,R[` & DeleteRays (i>VJr CreateSource srcnode c ;` TraceExisting 'draw Oa\!5Pw1 nab:y(]$/ 'radiometry tUv@4<~,/ For k = 0 To GetEntityCount()-1 DIodQkF If IsSurface( k ) Then q5:-?|jXJ temp = AuxDataGetData( k, "temperature" ) A- IpE emiss = AuxDataGetData( k, "emissivity" ) G\tT wX4 If ( temp <> 0 And emiss <> 0 ) Then vV.'&."g ProjSolidAngleByPi = GetSurfIncidentPower( k ) ftF?T.dx frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) a9Lf_/w{ & irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ^#e:q End If K)$.0S9d 7qA);N End If ya{vR*
'~ zAt!jP0E Next k cqr!* ^*'|(Cv Next j vG#|CO9 wlBdA Next i 2fTkHBhn& EnableTextPrinting( True ) ~ C6<75 wA)
NB 'write out file N:[m,U9a fullfilepath = CurDir() & "\" & fname `zRgP# Open fullfilepath For Output As #1 K+Al8L?K_ Print #1, "GRID " & nx & " " & ny "cRc~4%K Print #1, "1e+308" J7t5B}} Print #1, pixelx & " " & pixely R+8+L|\wHv Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 bmhvC9 fG;)wQJ maxRow = nx - 1 d
/&aC#'B maxCol = ny - 1 6G7B&"& For rowNum = 0 To maxRow ' begin loop over rows (constant X) A,e/y row = "" mN@)b+~(S For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) r
vVU5zA4H row = row & irrad(colNum,rowNum) & " " ' append column data to row string 6 +^V Next colNum ' end loop over columns A2qus$ *fW&-ic Print #1, row e"hm|' jJ?MT#v Next rowNum ' end loop over rows nVw]0Yl Close #1 wKe^5|Rr UP 1Y3 Print "File written: " & fullfilepath 2:MB u5** Print "All done!!" YTQ|Hg6jO End Sub 's@v'u3 HD ?z 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: R}Uvi9? PV(bJ7&R : RnjcnR 找到Tools工具,点击Open plot files in 3D chart并找到该文件 vLDMa> < Upn~tH *pw:oTO 打开后,选择二维平面图: u!oHP 7'7bIaJk
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