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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。 ~*y7%L4B 7][fciZN 成像示意图 K@%T5M4j 首先我们建立十字元件命名为Target bma.RCyY< ]3, 创建方法: -!qjBK,`X u9~Ncz 面1 : x|Pz24yP9 面型:plane <T)0I1S 材料:Air ;r~1TUKb 孔径:X=1.5, Y=6,Z=0.075,形状选择Box `AvK8Wh<+ 1y6<gptx ~MC5rOA 辅助数据: d}Guj/cx, 首先在第一行输入temperature :300K, @&&}J emissivity:0.1; *y7Yf7 bV2a2#kj )m8Gbkj< 面2 : IBeorDIZ 面型:plane x7^VU5w# 材料:Air l<4P">M!. 孔径:X=1.5, Y=6,Z=0.075,形状选择Box k:j_:C&. l59
N0G $uFvZ?w& 位置坐标:绕Z轴旋转90度, ~}d\sQF. ml^=y~J[ fJ5mKN 辅助数据: x\~ <8o YT'V/8US 首先在第一行输入temperature :300K,emissivity: 0.1; 8%YyxoCH pV(Mh[ }P 'U ZzH$h Target 元件距离坐标原点-161mm; |.yS~XFJS a'Odw2Q_ Zos.WS# 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ;/wH/!b TB&IB:4)R 2vG
X\W%3 探测器参数设定: !s/qqq:g 'q~<ZO 在菜单栏中选择Create/Element Primitive /plane )CE]s)6+2 5bXpj86mY LH+Bu%s >?ar [N~-9 }|) N5bGQe 元件半径为20mm*20,mm,距离坐标原点200mm。 -Q5UT=^ ZnAQO3%y 光源创建: q27q/q8 2-ksr}: 光源类型选择为任意平面,光源半角设定为15度。 Wtk|}>Pf YryMB,\ sUmpf 4/ 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。 qc)+T_m we!w5./Xm 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。 W+=j@JY}q9 XY9%aT* %uV,p!| ) 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。 eNi#% ?=WB Eul3 {+] 创建分析面: Y?0x/2< xW9R-J\W 6(htpT%J 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。 et/l7+/' ;w]1H&mc*A m8F
\ESL 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。 v^Fu/Y }QQl.' FRED在探测器上穿过多个像素点迭代来创建热图 a;U)#*(5|v a_[+id 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。 ;g+fY6 将如下的代码放置在树形文件夹 Embedded Scripts, ?z-nY,'^uq vR5X @cxM#N8e 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。 *KiY+_8> <jYyA]Zy5 绿色字体为说明文字, nTs\zikP z(O*DwY# '#Language "WWB-COM" U+4[w`a} 'script for calculating thermal image map > QN-K]YLL 'edited rnp 4 november 2005 e?07o!7[; {|<r7K1< 'declarations #n.v#FyNx Dim op As T_OPERATION a Iyzt Dim trm As T_TRIMVOLUME \SwqBw Dim irrad(32,32) As Double 'make consistent with sampling D,FgX/&i/ Dim temp As Double l<S3<'& Dim emiss As Double ?/hS1yD; Dim fname As String, fullfilepath As String A(BjU:D(Oj Yh"9,Z&wiR 'Option Explicit =x(k)RTDu )w&|VvM )L Sub Main (M{wkQTO 'USER INPUTS m432,8 K3r nx = 31 *M:p[.=1 ny = 31 g}hNsU=$5~ numRays = 1000 =Y!.0)t;* minWave = 7 'microns +:70vZc:V@ maxWave = 11 'microns ND=JpVkvZ? sigma = 5.67e-14 'watts/mm^2/deg k^4 iny/K/5bf fname = "teapotimage.dat" ~=HPqe8 _Fv6S}~Q Print "" .ty2! . Print "THERMAL IMAGE CALCULATION" nDckT+eJ XknNb{. r detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 /J!hKK^k &A/b9GW^- Print "found detector array at node " & detnode Xf{p>-+DL TI"Ki$jC srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 >
9z-/e |rhB@k Print "found differential detector area at node " & srcnode |)O;+e\ :AuK Q`c GetTrimVolume detnode, trm .S=|ZP+ detx = trm.xSemiApe 3qNuv];2 dety = trm.ySemiApe fffWvf area = 4 * detx * dety }
MP_ Print "detector array semiaperture dimensions are " & detx & " by " & dety g}9heR Print "sampling is " & nx & " by " & ny SjJ$Oinc F60m]NUM)c 'reset differential detector area dimensions to be consistent with sampling &js$qgY pixelx = 2 * detx / nx |r+hj<K pixely = 2 * dety / ny PT&qys2k SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False hA&m G33 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 Kh&a# ~c 33hP/p% 'reset the source power m<cv3dbZo SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 9v
,y Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" E J6|y' iQCs8hIR 'zero out irradiance array QOJ5 For i = 0 To ny - 1 2#UVpgX? For j = 0 To nx - 1 %^"i\-*|S irrad(i,j) = 0.0 f|s,%AU"i Next j += gU`<\ Next i i8R2Y9Q*O pm= s 'main loop Yc5)
^v EnableTextPrinting( False ) 1mfB6p1Z( `VglE?M ypos = dety + pixely / 2 = P$7
" For i = 0 To ny - 1 R-f('[u xpos = -detx - pixelx / 2 ({C|(v9C7 ypos = ypos - pixely #Wv8+&n oMq:4W, EnableTextPrinting( True ) [e:ccm Print i nnd-d+$ EnableTextPrinting( False ) /" &Jf}r ah!RQ2hDrV HXqG;Fds( For j = 0 To nx - 1 OG7U+d6 +~lPf. xpos = xpos + pixelx ^Ri
;
vM j(_6.zf 'shift source (|y@ftr@ LockOperationUpdates srcnode, True c&SSf_0O* GetOperation srcnode, 1, op :%zA X op.val1 = xpos 8..g\ZT op.val2 = ypos N\hHu6 SetOperation srcnode, 1, op P2U [PO LockOperationUpdates srcnode, False -li;w
tCS w~e$ul(IQM raytrace Hegj_FQ DeleteRays ^p\n/#B CreateSource srcnode pr1>:0dg TraceExisting 'draw 0IbR>zFg. K!!#";Eo 'radiometry M_;hfpJZ For k = 0 To GetEntityCount()-1 nh"LdHqiDB If IsSurface( k ) Then @Y&(1Wl temp = AuxDataGetData( k, "temperature" ) 9 NC'iFQ# emiss = AuxDataGetData( k, "emissivity" ) vH?3UW If ( temp <> 0 And emiss <> 0 ) Then c 9zMI ProjSolidAngleByPi = GetSurfIncidentPower( k ) P;p20+ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) iN+&7#x;/ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ~_4$|WKl End If DDU)G51>d >t $^U End If r@H7J 5<Y- R%r<AL5kJk Next k +~EFRiP] a0B,[i Next j 9M .cTIO{ Q\Nz^~dQ:Y Next i {UOR_Vt!* EnableTextPrinting( True ) 9,AHC2kn% :k oXS 'write out file :x_;- fullfilepath = CurDir() & "\" & fname /A%31WE&1 Open fullfilepath For Output As #1 6vZ.CUK9 Print #1, "GRID " & nx & " " & ny ^36m$J $ Print #1, "1e+308" Q-$EBNz Print #1, pixelx & " " & pixely OQ by=} A Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 .!h`(>+@ 2c8e:Xgv maxRow = nx - 1 ?\T):o;/ maxCol = ny - 1 ]1i1_AR'` For rowNum = 0 To maxRow ' begin loop over rows (constant X) /Os;, g row = "" *Zk$P.] For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) An3%@; row = row & irrad(colNum,rowNum) & " " ' append column data to row string 9uA2M!~i2 Next colNum ' end loop over columns X!/ J~1=?</ Print #1, row 3Qoa?* N:7;c}~ Next rowNum ' end loop over rows ^/v!hq_#%& Close #1 CXhE+oS5z' H83/X,"!w Print "File written: " & fullfilepath Kx5VR4f`J@ Print "All done!!" c=\H&x3X End Sub JnZlz?}^ R"k}wRnxY 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: ]tDuCZA *lws7R V|zatMHs 找到Tools工具,点击Open plot files in 3D chart并找到该文件 @G>Q(a*, !&8HA i slg5 打开后,选择二维平面图: 4?cIn4} !S}4b
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