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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。 G"Pj6QUva taV|YP$ 成像示意图 gz\j('~-D 首先我们建立十字元件命名为Target b%<jUY LDX y}hm) 创建方法: y:9?P~ g RU-g 面1 : G5umeqYC 面型:plane 1.dX)^\ 材料:Air dqz1xQ1 孔径:X=1.5, Y=6,Z=0.075,形状选择Box BvJ\x) enPYj.*/0 %mmxA6I 辅助数据: J/[7d?hI/ 首先在第一行输入temperature :300K, 6vWii)O.D emissivity:0.1; \7DCwu[0M Rk{$S"8S_ eoL0^cZj 面2 : ZIy(<0 面型:plane 5~yQ>h 材料:Air K*:Im#Q 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Xv&%2-V; +7^w9G QRiF!D)Nk 位置坐标:绕Z轴旋转90度, Q'C4pn@ !p"Kd ~ e
sGlMq 辅助数据: $~ VcQ D:6N9POB 首先在第一行输入temperature :300K,emissivity: 0.1; M;PlSb 6Ok,_
! ]3 j[3' Target 元件距离坐标原点-161mm; F]0Jwm{ K)N)IZ1q 2X^iV09 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 6ku8`WyoF )2toL5 Q _rG-#BKW8L 探测器参数设定: P 4H*jy@? fGG
9zB6 在菜单栏中选择Create/Element Primitive /plane sB8p(
L n }TTq6B > `0| X TftOYY.hQ x6jm-n do*Wx2:R 元件半径为20mm*20,mm,距离坐标原点200mm。 |<'10 &!4(
0u 光源创建: <G&WYk%u* XCV0.u| 光源类型选择为任意平面,光源半角设定为15度。 L#[HnsLp_ Od*v5qT;$ Y0rf9 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。 g8Ok ^ tI
`w;e%HN 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。 2"zI R( F6~b#Jz&i %odw+PhO 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。 e1oFnu2R QZWoKGd}+ 创建分析面: l;XUh9RF`A RLv&,$$0 y+l<vJu 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。 $B*qNYpPy. EWSr@}2j
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"xI 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 #3YdjU3w zj%cd; FRED在探测器上穿过多个像素点迭代来创建热图 69N1 mP 0qOM78rE FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 Z=0iPy,m> 将如下的代码放置在树形文件夹 Embedded Scripts, "MW55OWYU //VG1@vaVX (69kvA&|q 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 \?J=mE@;1 l)|z2H 绿色字体为说明文字, w($XEv; qdKh6{ '#Language "WWB-COM" 4U_rB9K$ 'script for calculating thermal image map \XZU'JIO 'edited rnp 4 november 2005 :Xb*m85y rHH#@Zx 'declarations 3L%Y"4(mm Dim op As T_OPERATION V=:,]fTr Dim trm As T_TRIMVOLUME h<t<]i' Dim irrad(32,32) As Double 'make consistent with sampling 1OuSH+ Dim temp As Double 44z=m MR< Dim emiss As Double h]G6~TYI5 Dim fname As String, fullfilepath As String FuIWiO( A;K{ &x 'Option Explicit FA5k45wL QSO5 z2| Sub Main KB$ vQ@N 'USER INPUTS LPtx|Sx![ nx = 31 OFJJ-4[_3 ny = 31 wCqE4i numRays = 1000 :DF`A( minWave = 7 'microns g`y/_ maxWave = 11 'microns **"zDY*?W sigma = 5.67e-14 'watts/mm^2/deg k^4 Z?.:5# fname = "teapotimage.dat" Lx|w~+k} ,:\zXESy4 Print "" 37GHt9l Print "THERMAL IMAGE CALCULATION" cj,&&3sbV HJ2O@e detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 n:%'{}Jw yTMGISX5 Print "found detector array at node " & detnode D_L'x" M$DwQ}Z srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 I_{9eG1w? 3?-V>-[G_ Print "found differential detector area at node " & srcnode Iwd"f B{=,VwaP_ GetTrimVolume detnode, trm 0O@[on;Bd detx = trm.xSemiApe f?oI'5R41 dety = trm.ySemiApe + xkMW%e< area = 4 * detx * dety G5C#i7cpm Print "detector array semiaperture dimensions are " & detx & " by " & dety XmE_ F Print "sampling is " & nx & " by " & ny 0hEF$d6U PDa06(t7 'reset differential detector area dimensions to be consistent with sampling _A# x&<c pixelx = 2 * detx / nx r)*_,Fo| pixely = 2 * dety / ny tFb|y+ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False TU^tW Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 x %!OP\ I+-Rs2wb 'reset the source power ^$^Vd@t>a SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) _ ;v_L Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" -F~9f> mAtG&my) 'zero out irradiance array o
F,R@f For i = 0 To ny - 1 "@):*3
4 For j = 0 To nx - 1 I=Lj_UF4 irrad(i,j) = 0.0 )xXrs^ Next j G+%5V5GS Next i {;wK,dU 0Mzc1dG: 'main loop "1\RdTw EnableTextPrinting( False ) n,R[O_9u[ yM\tbT/l ypos = dety + pixely / 2 +b:h5, For i = 0 To ny - 1 b]s%B.h xpos = -detx - pixelx / 2 wN%DM)*k ypos = ypos - pixely _@}MGWlAPt U~QCN[gh EnableTextPrinting( True ) 5#A1u
Nb Print i E,nYtn|B EnableTextPrinting( False ) xHR+((
\1c`) _<&K]e@dp For j = 0 To nx - 1 1]zyME oBGst t@ xpos = xpos + pixelx jTxChR m$G?e9{ 'shift source qhHRR/p LockOperationUpdates srcnode, True B[k+#YYY GetOperation srcnode, 1, op &bRxy`ZH op.val1 = xpos =.3P)gY) op.val2 = ypos T[2f6[#[_ SetOperation srcnode, 1, op -p]`(S% LockOperationUpdates srcnode, False -n$rKEC4 gx{~5&1 raytrace %.Q2r ?j DeleteRays lyc{Z%!3 CreateSource srcnode r
z>zdj5} TraceExisting 'draw |<o>$;mZ Yi! >8 'radiometry `cTsS For k = 0 To GetEntityCount()-1 @XSu?+s) If IsSurface( k ) Then I]j/ ab7> temp = AuxDataGetData( k, "temperature" ) `E1_S emiss = AuxDataGetData( k, "emissivity" ) $9u If ( temp <> 0 And emiss <> 0 ) Then PX>\j& ProjSolidAngleByPi = GetSurfIncidentPower( k ) DcvmeGl frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) T"0)%k8lJ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 8f`b=r(a> End If %l$&_xV- , $F0D End If DWevg;_]$( )*AA9 Next k q.K$b H<}Fk9 Next j C%7 ,#}[U/ z4%F2Czai& Next i "a_D]D(d5 EnableTextPrinting( True ) FT?1Q' ="nrq&2 'write out file :{= 'TMJ7 fullfilepath = CurDir() & "\" & fname SbNU X Open fullfilepath For Output As #1 )|1JcnNSa Print #1, "GRID " & nx & " " & ny R~?; KJ Print #1, "1e+308" o_^d>Klb8 Print #1, pixelx & " " & pixely ezy5Jqk5% Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 NGeeD?2~
*Zo o maxRow = nx - 1 HC`3AQ12!& maxCol = ny - 1 g"AfI For rowNum = 0 To maxRow ' begin loop over rows (constant X) YD>>YaH_3@ row = "" Nk~dfY<s For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) K@u."eaD row = row & irrad(colNum,rowNum) & " " ' append column data to row string r{3`zqo Next colNum ' end loop over columns (+v*u ]w4 sNpBTG@{l Print #1, row .BB:7+ tcdn"]#U Next rowNum ' end loop over rows uTt:/gm Close #1 8`?j*FV7kq U[ungvU1U Print "File written: " & fullfilepath $%"}N_M Print "All done!!" !rqR]nd End Sub 8 =Lv7G% sN) .Jo 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: U@AfRUF& #\;w:: ]|BSX-V.%i 找到Tools工具,点击Open plot files in 3D chart并找到该文件 ( #"s!!b NKh{iSLm wef^o"aP 打开后,选择二维平面图: `ha:Gf RL)3k8pk
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