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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。 "0EA;S8$8 8*SP~q 成像示意图 m3^/:< 首先我们建立十字元件命名为Target ;D.h65rr aP&D9%5 创建方法: aZk&`Jpz FkqQf8HB 面1 : CN2_bz 面型:plane ==H$zmK 材料:Air =l9T7az 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 1mSaS4!"B +-a&2J;J' u=&Bmn_ 辅助数据: B(DrY1ztj 首先在第一行输入temperature :300K, s-W[.r| emissivity:0.1; D\~e&0* _Hd{sd#xX1 [Qdq}FYr 面2 : Zw]
?. 面型:plane %>WbmpIyc 材料:Air sLcFt1 孔径:X=1.5, Y=6,Z=0.075,形状选择Box _J]2~b '(#g1H3 t=R6mjb 位置坐标:绕Z轴旋转90度, ^# A.@ '+*-s7o{ tVqmn 辅助数据: quo^fqS&a . -"E^f 首先在第一行输入temperature :300K,emissivity: 0.1; O}#yijU3e nN3$\gHp8i O4No0xeWo Target 元件距离坐标原点-161mm; IC{F.2D ,}C8;/V S^f:`9ab9 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 }'=h4yI fMeZ]rb ^+R:MBK 探测器参数设定: l#@&~f[ QfQ\a%cc 在菜单栏中选择Create/Element Primitive /plane W3Ulewa /.=r>a}l nSY-?&l6P sFb4` D22Lu;E 0]x;n+G[q 元件半径为20mm*20,mm,距离坐标原点200mm。 ., :uZyG ewB!IJxh 光源创建: Z,WW]Y,$ +#]|)VZ 光源类型选择为任意平面,光源半角设定为15度。 [}3cDR }.:d#]g8 i~& c| 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。 ^p_u.P
'H FK Bp 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。 (:Cc3 FBsn;,3<W Zj-BuE&@f 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。 c6b0*!D"} cD{8|B* 创建分析面: 1.SkIu% Qa$NBNxKl ]@SU4 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 ;IC'Gq Isovwd D{AFL.r{ 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。
F$*3@Y fQQ|gwVki FRED在探测器上穿过多个像素点迭代来创建热图 A/Khk2-: m{&w{3pQk 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。 `Lz1{#F2G 将如下的代码放置在树形文件夹 Embedded Scripts, G[q9A$yw i=8UBryr'e '8r8%XI 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 /84bv= a{`"68 绿色字体为说明文字, +p?hGoF= S!7g) '#Language "WWB-COM" 9bn2UiJk 'script for calculating thermal image map
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+0 'edited rnp 4 november 2005 IT1PPm b~W)S/wF$P 'declarations /Dw@d,&[ Dim op As T_OPERATION 5.k}{{+ Dim trm As T_TRIMVOLUME /{DaPqRa Dim irrad(32,32) As Double 'make consistent with sampling n+quSF) Dim temp As Double 2cjEex:& Dim emiss As Double B~_Spp Dim fname As String, fullfilepath As String 1D$::{h GEtbs+ [ 'Option Explicit g+9v$[! ]xR4->eix Sub Main /Ri,>}n 'USER INPUTS ?f@ 9n ph nx = 31 nx;$dxx_Ws ny = 31 4zzlazU numRays = 1000 qG^_c;l6a minWave = 7 'microns k2OM="Ei} maxWave = 11 'microns (zmNa}- sigma = 5.67e-14 'watts/mm^2/deg k^4 .b _? -Fv fname = "teapotimage.dat" [` 'd#pR x(vai1CrdH Print "" !
o^Ic`FhS Print "THERMAL IMAGE CALCULATION" BVAr&cu O!];_q/ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 V5Xi '= b8cVnP Print "found detector array at node " & detnode )]A9~H N<"`ShCNM srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 o4'Wr qwP $~Bj Print "found differential detector area at node " & srcnode 1$OVe4H1 3q CHh GetTrimVolume detnode, trm od(:Y(4 detx = trm.xSemiApe <p)Z/ dety = trm.ySemiApe g 9|qbKQ:[ area = 4 * detx * dety w^U}|h" Print "detector array semiaperture dimensions are " & detx & " by " & dety 6s5b$x Print "sampling is " & nx & " by " & ny zS?n>ElI e2Ww0IK!E 'reset differential detector area dimensions to be consistent with sampling j Ii[ pixelx = 2 * detx / nx YnD#p[Wo^ pixely = 2 * dety / ny X/wmKi SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False \2Xx%SX Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 I)rGOda{ 1XGG.+D 'reset the source power Uf^RLdoDn SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) )"F5lOA6 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" wH#-mu#Yl< f^u^-l 'zero out irradiance array '5V^}/ For i = 0 To ny - 1 eB7>t@ED For j = 0 To nx - 1 0&Qsk!-B irrad(i,j) = 0.0 'jN/~I Next j 'X|v+? Next i }/49T O!yakU+ 'main loop %Dra7B% EnableTextPrinting( False ) .P8-~?&M 9='=-;@/5 ypos = dety + pixely / 2 ?-d
Ain1w For i = 0 To ny - 1 K Ka c6Zj xpos = -detx - pixelx / 2 |&Au6 3 ypos = ypos - pixely u2\+?`Ox KCl &H EnableTextPrinting( True ) PK_Fx';ke^ Print i VkWO} EnableTextPrinting( False ) 0Ux<16# _ r~+p %
<^[j^j}o For j = 0 To nx - 1 z^gi[
mi v&e-`.xR xpos = xpos + pixelx L)1C'8). =zz+<!! 'shift source \m%J`{Mt LockOperationUpdates srcnode, True P&,hiGTDi GetOperation srcnode, 1, op yB=C5-\F op.val1 = xpos jT{f<P0 op.val2 = ypos tK*%8I\s SetOperation srcnode, 1, op jk
K#e$7 LockOperationUpdates srcnode, False =?wMESU )-)ss"\+Ju raytrace U)
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Tbm DeleteRays &3WkH W CreateSource srcnode s c5\( b TraceExisting 'draw xQX<w\s *&(2`#C; 'radiometry Q^[e/U, For k = 0 To GetEntityCount()-1 L7s>su|c( If IsSurface( k ) Then KlY,NSlQ temp = AuxDataGetData( k, "temperature" ) 2]2{&b u emiss = AuxDataGetData( k, "emissivity" ) LjSLg[ i If ( temp <> 0 And emiss <> 0 ) Then FwXKRZa ProjSolidAngleByPi = GetSurfIncidentPower( k ) (QhGxuC frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) V+peO irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi C2CYIok$& End If %)BwE ? 7/W> End If NY.}uZ .4H_Zt[2 Next k YR?3 61FK 6 #-6Bh)>4 Next j +.S#= Q^*G`&w, Next i *~"zV`*Q EnableTextPrinting( True ) qUifw @ fL(':W&n- 'write out file v&p,Clt-2 fullfilepath = CurDir() & "\" & fname P#w}3^ Open fullfilepath For Output As #1 (m<R0 Print #1, "GRID " & nx & " " & ny XyvZ&d6(d Print #1, "1e+308" m5X3{[a: Print #1, pixelx & " " & pixely NQDLI 1o Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 w9G_>+?E 5dg-d\6S maxRow = nx - 1 ?(fQ<i n maxCol = ny - 1 ;3 G~["DA For rowNum = 0 To maxRow ' begin loop over rows (constant X) F5<"ktnI row = "" yB0jL:|a For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) KYnW7|* row = row & irrad(colNum,rowNum) & " " ' append column data to row string >{j,+$%kp Next colNum ' end loop over columns }5fU7&jA;3 0\?_lT2 Print #1, row <^CYxy J
ZVr&KZN Next rowNum ' end loop over rows /1IvLdPIu Close #1 IUluJ.sXIf
H;b8I Print "File written: " & fullfilepath o}WB(WsG Print "All done!!" jz{(q; End Sub JN{<oxI A8\U
CG 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: l4iuu HF*j`} 1;cv-W 找到Tools工具,点击Open plot files in 3D chart并找到该文件 UiJ^~rn o,*folL 1bV 2 打开后,选择二维平面图: _ff=B a/`c ef
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