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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。 UK,bfLPt~ 9;LjM ~Ct 成像示意图 -7&ywgxl 首先我们建立十字元件命名为Target Cdz?+hb 26/<\{q~ 创建方法: U^KWRqt _{`Z?lt 面1 : ;J|t-$Z 面型:plane xF{%@t 材料:Air z@VL?A(3 孔径:X=1.5, Y=6,Z=0.075,形状选择Box tn$TyCzckW N*36rR$^ `n>|rd 辅助数据: ^>an4UJt 首先在第一行输入temperature :300K, `F/R:!v emissivity:0.1; ;-`NT`
#2 kKlNhP( ufk2zL8y 面2 :
nT> v 面型:plane l1T`[2 材料:Air MxpAh<u!vF 孔径:X=1.5, Y=6,Z=0.075,形状选择Box L'Cd`.yVO )yyH_Ax2 G4c@v1#%. 位置坐标:绕Z轴旋转90度, #qVTB@d ?Ojv<L-f.: }~W/NP_F 辅助数据: 9_wDh0b~p J.JD8o9sa 首先在第一行输入temperature :300K,emissivity: 0.1; w\i]z1 ~E6sY
R=.?el Target 元件距离坐标原点-161mm; *DIY;)K iA{q$>{8 t#(=$ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ,oH\rrglf 2&*#k -6J <{1V 探测器参数设定: 33<{1Y[Q6E lwfS$7^P 在菜单栏中选择Create/Element Primitive /plane l|
uiC%T E+i(p+=4 3ux7^au [_%u5sc-y v76P?[ cEa8l~GC< 元件半径为20mm*20,mm,距离坐标原点200mm。 n@tt.n!{l _w\i ~To! 光源创建: m7i_Iv ^[SW07o~ 光源类型选择为任意平面,光源半角设定为15度。 \%r0'1f Y7+c/co <xSh13< 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。 GXm#\)
;@k=9o]A 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。
kntY2FM 0p[k7W u 3r#['UmT 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。 41=H&G& nGWy4rY2S 创建分析面: FVkl#Qy~ EGI$=Y P9m 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。 LhKbZoPp nHeJ20 Lk]|;F-2i 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。 jMBMqQNU 4tUoK[p FRED在探测器上穿过多个像素点迭代来创建热图 p>pN?53S G~C-tAB 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。 UTE6U6 将如下的代码放置在树形文件夹 Embedded Scripts, ~Y
f8,m e.L&A| ;]xc}4@=mg 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。 pHb,*C</ |LJv* 绿色字体为说明文字, SVwxK/Fci ZzBaYoNy[0 '#Language "WWB-COM" 6bs-&Vf 'script for calculating thermal image map 2hNl_P~z1u 'edited rnp 4 november 2005 $X;OK ^!exH(g 'declarations \nP79F0%2 Dim op As T_OPERATION 2k=|p@V n~ Dim trm As T_TRIMVOLUME 1H.;r(c Dim irrad(32,32) As Double 'make consistent with sampling [ <d~b*/ Dim temp As Double O[$X36z Dim emiss As Double kD+#| f Dim fname As String, fullfilepath As String PW%ith1)< Ff>X='{ 'Option Explicit ORKJy)*" p q?# X0 Sub Main ?r(vXq\ 'USER INPUTS SJ22 nx = 31 ~t2"L|i ny = 31 b(mZ/2,B numRays = 1000 x])j]k minWave = 7 'microns w(_:+-rqQ< maxWave = 11 'microns H @zZ[ sigma = 5.67e-14 'watts/mm^2/deg k^4 n%\\1 fname = "teapotimage.dat" 7>@0nHec c99|+i50 Print "" + W1l9n* Print "THERMAL IMAGE CALCULATION" ubZuvWZ =>>Dnp detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 r9(c<E?,h cahlYv' Print "found detector array at node " & detnode J
R~s`>2 HQ=pf > srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 )40YA\V N1g;e?T': Print "found differential detector area at node " & srcnode >op/<?< n&]J-^Tx GetTrimVolume detnode, trm 0)PZS> detx = trm.xSemiApe S9[Up}` dety = trm.ySemiApe E{-pkqx area = 4 * detx * dety NI:OL
Print "detector array semiaperture dimensions are " & detx & " by " & dety \QSD* Print "sampling is " & nx & " by " & ny S]T71W<i h$~$a;2cR 'reset differential detector area dimensions to be consistent with sampling liB~vdqj pixelx = 2 * detx / nx GRL42xp'*D pixely = 2 * dety / ny /L$q8 + SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ZA_~o#0% Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 wU]8hkl? nf_(_O= 'reset the source power +LWgby4q SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 4K;0.W;~| Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" biV|W@JM "lA$;\& 'zero out irradiance array c}=[r1M* For i = 0 To ny - 1 NJ}xqg For j = 0 To nx - 1 Tnf&32IA irrad(i,j) = 0.0 @$QtY(a Next j tx3p,
X Next i ;SA+|, 3\<(!yY8 'main loop {![E)~ EnableTextPrinting( False )
JZyEyN m`XaY J ypos = dety + pixely / 2 [)[?FG9
For i = 0 To ny - 1 Q3)[
*61e xpos = -detx - pixelx / 2 rA_r$X ypos = ypos - pixely odcrP\S =`(\]t"I EnableTextPrinting( True ) ~te{9/ Print i kc2E4i EnableTextPrinting( False ) HwMe^e; 1*@Q~f:Uk k8.,id For j = 0 To nx - 1 [.G~5%974 T5-'|+ xpos = xpos + pixelx jI}{0LW&F& _{i-.;K 'shift source 5FNf)F
LockOperationUpdates srcnode, True q=BAYZ\` GetOperation srcnode, 1, op q*J-ii op.val1 = xpos {\!@k\__ op.val2 = ypos /8(t: SetOperation srcnode, 1, op =6w(9O LockOperationUpdates srcnode, False BS3BJwf;
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> raytrace rlDJHR6 DeleteRays {-5b[m( CreateSource srcnode ]7dal [i TraceExisting 'draw 6^p>f:5 E[_-s 'radiometry v[y|E;B For k = 0 To GetEntityCount()-1 5U l=Nv] If IsSurface( k ) Then f=MR.\ temp = AuxDataGetData( k, "temperature" ) TlBu3z'P emiss = AuxDataGetData( k, "emissivity" ) "l09Ae'V If ( temp <> 0 And emiss <> 0 ) Then OEN'c0;5 ProjSolidAngleByPi = GetSurfIncidentPower( k ) .3,Ow(3l frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) Vuo 8[h> irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi L@5g#mSl End If PmE2T\{s! m4T`Tg#P End If G|]39/OO3{ ?jBh=X\]: Next k cm7>%g(oQo =:'a)o Next j gI~jf- w Rh#TR" Next i 2KmPZ&r EnableTextPrinting( True ) .hXdXY Y{#m=-h 'write out file F_Mi/pB^`9 fullfilepath = CurDir() & "\" & fname _52BIrAO2 Open fullfilepath For Output As #1 K_~SJbl Print #1, "GRID " & nx & " " & ny -@_V|C'? Print #1, "1e+308" M}6? |ir Print #1, pixelx & " " & pixely {YgB?kt5 Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 9Lxj
]W2^ x-{awP maxRow = nx - 1 >;@hA*< maxCol = ny - 1 (PCv4:`g For rowNum = 0 To maxRow ' begin loop over rows (constant X) ^t\AB)(8 row = "" nK9A=H'Hc For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) S}*%l)vfR row = row & irrad(colNum,rowNum) & " " ' append column data to row string KuO5` Next colNum ' end loop over columns W|kKH5E& NLxsxomj Print #1, row `#~HCl wMB<^zZmv Next rowNum ' end loop over rows LA^H213N| Close #1 k/#& ]8( ~FV
Z0%+, Print "File written: " & fullfilepath Ge;plD-f Print "All done!!" L~jKx)S% End Sub Gv}h/zu- cx8H.L 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{ .UZTn ;-d :!* |f0KIb}d 找到Tools工具,点击Open plot files in 3D chart并找到该文件 )rs);Pl )xQA+$H#4 [sY>ac 打开后,选择二维平面图: GxGZxf*( 7Jm9,4]
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