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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。 l0=VE#rFl q+{yv 成像示意图 =+w/t9I[ 首先我们建立十字元件命名为Target ~WKWx.ul E'^ny4gL 创建方法: ZDx1v_xr w}0rDWuR[ 面1 : F0ylJ
/E 面型:plane yi*EE% 材料:Air =}'7}0M_= 孔径:X=1.5, Y=6,Z=0.075,形状选择Box fU|4^p) wo9`-o6
+Ou<-EQV 辅助数据: +2g}wH)l 首先在第一行输入temperature :300K, 2hY"bpGW emissivity:0.1; H
$mZ? ;E0x#JUrw KN'twPFq 面2 : 8\rAx P}= 面型:plane ^f9>tI{ 材料:Air |}Mt hj9n 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 9F7}1cH7g@ ubQr[/ 4@=[rZb9 位置坐标:绕Z轴旋转90度, y(X^wC )!=fy'] zQoJ8i> 辅助数据: /$^SiE+N R0e!b+MZ. 首先在第一行输入temperature :300K,emissivity: 0.1; )}@Z*.HZL )i[K1$x2 o.wXaS8 Target 元件距离坐标原点-161mm; I].ddR% :PNhX2F kW&zkE{ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 nPhREn! Z/LYTo$Bz qdo_YPG 探测器参数设定: 4iY
<7l8 ]L?WC 在菜单栏中选择Create/Element Primitive /plane I5E+=.T*ar WS"v"J% h<i.Z7F;tj G0(A~Q" J9P\D! rBZ00} 元件半径为20mm*20,mm,距离坐标原点200mm。 !,{-q)'D 'y7<!uo? 光源创建: V o%GO9b; rB_ESNx 光源类型选择为任意平面,光源半角设定为15度。 3935cxT1U 64D4*GQ 5uU{!JuSa 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。 rd^j< JqtOoR 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。 zLg_0r*h1 mxICQ>s
b ~zDFL15w 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。 u?KG% .jl^"{@6 创建分析面: +'aG{/J 5Zl7crA [ PMe 3Or@ 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。 B RtT 7 le2 v"Y <Ys7`e6eY 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。 i}>}%l| 0gr#<( FRED在探测器上穿过多个像素点迭代来创建热图 CFeAKjG %3T:W\h 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。 ,&jjpeZP 将如下的代码放置在树形文件夹 Embedded Scripts, Y^gIvX iBCIJ!; a]4|XJ_ 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。 1wW4bg 5 Z$S0X$q} 绿色字体为说明文字, D1EHT} :KsBJ>2ck '#Language "WWB-COM" 6+Y@dJnPT 'script for calculating thermal image map <9`/Y"\ p 'edited rnp 4 november 2005 :U-yO 9!j )T@+"Pw8t 'declarations M B,Z4 ^ Dim op As T_OPERATION }tedh Dim trm As T_TRIMVOLUME /_r{7Gq. Dim irrad(32,32) As Double 'make consistent with sampling C12y_E8Un Dim temp As Double b2YOnV Dim emiss As Double %j ?7O00@ Dim fname As String, fullfilepath As String uQkQ#'e| E /V`NqC 'Option Explicit Y4*?QBYA > u=nGeO Sub Main -3C$br 'USER INPUTS (Jk:Qz5 nx = 31 s$VLVT*6
ny = 31 E5$uvxCI numRays = 1000 LdyE*u_ minWave = 7 'microns s4>xh=PoJ maxWave = 11 'microns ; T WYO sigma = 5.67e-14 'watts/mm^2/deg k^4 62#8c~dL fname = "teapotimage.dat" UbSD?Ew@35 rE\.[mFI Print "" IeBb#Qedz Print "THERMAL IMAGE CALCULATION" Y+"Gx;F> U66oe3W detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 92L{be;SY XPcx"zv\ Print "found detector array at node " & detnode dH0wVI<z =eG:Scoug? srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ^Xslj YQ5d!a. Print "found differential detector area at node " & srcnode sg,9{R ^ S;S_<GX GetTrimVolume detnode, trm ys|};* detx = trm.xSemiApe |C;*GeyS;J dety = trm.ySemiApe P4~C0z area = 4 * detx * dety ,U'E!?=:VS Print "detector array semiaperture dimensions are " & detx & " by " & dety GK:pt8= Print "sampling is " & nx & " by " & ny kam\dn04 oOK&+r7 'reset differential detector area dimensions to be consistent with sampling WG3 .qLH% pixelx = 2 * detx / nx PWs=0.Wj pixely = 2 * dety / ny u/L\e.4 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False JKs&!! Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 +)TOcxF% I`EgR?5 ` 'reset the source power %R1$M318 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) #[Vk#BIiv8 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 8BwJWxBQ [7SR2^uf<j 'zero out irradiance array PQ[x A* For i = 0 To ny - 1 Hsz).u For j = 0 To nx - 1 A+F@JpV irrad(i,j) = 0.0 8VZLwhj Next j 6B>H75S+H Next i *|k/l I
p*(]8pDC 'main loop f}F
EnableTextPrinting( False ) x$aFJCL *1
l"|=_&s ypos = dety + pixely / 2 2u'h,on? For i = 0 To ny - 1 $qj||zA xpos = -detx - pixelx / 2 +46?+kKt ypos = ypos - pixely C\p _ Ndr4e?Xa, EnableTextPrinting( True ) B":u5_B Print i 8?&u5 EnableTextPrinting( False ) Smlf9h& Lj03Mx.2S Se-n# For j = 0 To nx - 1 t@\op}Z-M @^kt[$X; xpos = xpos + pixelx $N)b6(}F10 +cnBEv~y 'shift source tB7g.)yZb LockOperationUpdates srcnode, True knJoVo] GetOperation srcnode, 1, op [boB4>. op.val1 = xpos p8Wik<'^ op.val2 = ypos :IlJQ{=W SetOperation srcnode, 1, op 5Mq7l$]h$ LockOperationUpdates srcnode, False DQOEntw (Cjw^P|Y@
'raytrace ..hD_k DeleteRays #y&O5 CreateSource srcnode @fxDe[J: TraceExisting 'draw Zm!5X9^! )j>BvO 'radiometry 3fWL}]{<a For k = 0 To GetEntityCount()-1 )mw&e}jRV If IsSurface( k ) Then Zl+Ba temp = AuxDataGetData( k, "temperature" ) B`SHr"k!V[ emiss = AuxDataGetData( k, "emissivity" ) 9n#Em If ( temp <> 0 And emiss <> 0 ) Then ]DO"2r ProjSolidAngleByPi = GetSurfIncidentPower( k ) qKd&d frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ,HLgb}~ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 5b^`M End If 78W& m@){@i2. End If
<c&6M )2jBhT Next k EFb"{L I6E!$} Next j VU[4 W8f #c:b8rw Next i oj1,DU EnableTextPrinting( True ) cc^ [u+ )W& $FU4JK 'write out file z3:tSjF fullfilepath = CurDir() & "\" & fname 3r(i=ac0 Open fullfilepath For Output As #1 b\O%gg\p%! Print #1, "GRID " & nx & " " & ny ~Z#jIG<?g Print #1, "1e+308" b0_Ih6 Print #1, pixelx & " " & pixely .s!qf!{V` Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 :"oQ _bLT R~R ?0aq maxRow = nx - 1 7FiQTS B: maxCol = ny - 1 ]wQ#8}zO For rowNum = 0 To maxRow ' begin loop over rows (constant X) eJ23$VM+9 row = "" _v9P0W^.7 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) igD,|YSK`z row = row & irrad(colNum,rowNum) & " " ' append column data to row string XeT{y]lkd Next colNum ' end loop over columns Z/S7ei@56 \%FEQa0u Print #1, row voHFU#Z$
jo_wBJKE Next rowNum ' end loop over rows *=X$j~#X Close #1 (haYY]W\ RvPC7,vh Print "File written: " & fullfilepath mw*BaDN@Q Print "All done!!" =R
<X!@ End Sub ^<}eONa ,' m<YTF 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: O*ql!9}E{ _K?{DnTb &7 YTz3aj 找到Tools工具,点击Open plot files in 3D chart并找到该文件 rIt#ps $C;) Tlh 6?3f+=e"~! 打开后,选择二维平面图: n^Uu6 h8Bs=T
QQ:2987619807 FesXY856E
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