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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。 >U^AIaW -[s*R%w 成像示意图 EA2BN} 首先我们建立十字元件命名为Target .s|n}{D_i x{u_kepv[k 创建方法: Qp<?[C}'W M}}9 面1 : qt}vM*0}V 面型:plane epm
t 材料:Air =/J4(#Xb 孔径:X=1.5, Y=6,Z=0.075,形状选择Box !h7`W*:: E=w $r XZuJ<]}X, 辅助数据: 71cc6T 首先在第一行输入temperature :300K, mwCNfwb: emissivity:0.1; 1j6ZSE/*| q|om^:n. -:m;ePK 面2 : %,MCnu&Z 面型:plane |!dyk<}oIu 材料:Air 8iD_md_[ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box pq*b"Jku1 \P!v9LX( ^o"9f1s 5 位置坐标:绕Z轴旋转90度, Mq42^m:qe wCeSs=[ *D F5sY 辅助数据: N2;T\xx, |]DZc/ 首先在第一行输入temperature :300K,emissivity: 0.1; 79u L"N; a<sEd p E@"+w,x) Target 元件距离坐标原点-161mm; I1kx3CwJ{P -hL8z$} 0gHJ%m9s 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 P$.Azrl 29u"\f a 2j H` 探测器参数设定: Uk-^n~y G?e,Q$ 在菜单栏中选择Create/Element Primitive /plane O~9
%!LAu ;f[Ki$7 }@4m@_gR? \Yz>=rY ?;+=bKw0 t3 *2Z u 元件半径为20mm*20,mm,距离坐标原点200mm。 i5|A\Wv" 3w
?)H 光源创建: iYHD:cg)~ ]&yO>\MgJB 光源类型选择为任意平面,光源半角设定为15度。 !zvKl;yT w@X<</` 6"[`"~9'V 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 ;yY>SaQ g{8>2OK$c 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。 X82sw>Y Dq*>+1eW2 /%$'N$@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。 `9s5 *;Z q*@7A6:FV> 创建分析面: )1lR;fD W*u Yb|0 ??aOr*% 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。 8Y
sn8 mDvZ1aj ^]Lr_k 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。 0D/j2cT("k so8isDC'9 FRED在探测器上穿过多个像素点迭代来创建热图 w%VHq z$ K;_p>bI5 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。 b,~4O~z 将如下的代码放置在树形文件夹 Embedded Scripts, oA"t`,3 aQMET~A: bh6Mh<+ 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。 t=~al8 iwJBhu0@# 绿色字体为说明文字, /+"BU-aQk x7t<F4 '#Language "WWB-COM" ><TuL7+ 'script for calculating thermal image map |Ag~k? QC 'edited rnp 4 november 2005 yps7MM-r >72j,0=e 'declarations >VE,/?71@ Dim op As T_OPERATION PGP9-M Dim trm As T_TRIMVOLUME }v;@1[.B Dim irrad(32,32) As Double 'make consistent with sampling Q68&CO(rE Dim temp As Double R6h(mPYA Dim emiss As Double O:+#k-? Dim fname As String, fullfilepath As String a_L&*%; >9Fs)R]P 'Option Explicit ?c+_}ja, H-nk\ K<| Sub Main )T(xQ2&r4 'USER INPUTS SM@l4GH nx = 31 ]N:SB ny = 31 ?2
u_E " numRays = 1000 *["9;_KD minWave = 7 'microns .2C}8GGC' maxWave = 11 'microns AJiEyAC!)5 sigma = 5.67e-14 'watts/mm^2/deg k^4 `]FA} wC fname = "teapotimage.dat" a"b9h{h@ S3MMyS8 Print "" M9_
y>N[0 Print "THERMAL IMAGE CALCULATION" ,1Suq\
L Ib*l{cxN detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 bDeHU$
zKx?cEpE Print "found detector array at node " & detnode U!XC-RA3
_ g*N~r['dZ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 q^JJ5{36e "e69aAA, Print "found differential detector area at node " & srcnode ipQJn_:2 PM=Q\0 GetTrimVolume detnode, trm ^Gq4Yr detx = trm.xSemiApe D}SRr,4v dety = trm.ySemiApe 0F1 a area = 4 * detx * dety zg.' Print "detector array semiaperture dimensions are " & detx & " by " & dety ua0`&,a3I Print "sampling is " & nx & " by " & ny W% YJ.%I c;xL. 'reset differential detector area dimensions to be consistent with sampling U8c0N<j pixelx = 2 * detx / nx 2Y(Phw2% pixely = 2 * dety / ny |[>`3p"& SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 6|V713\ Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 z[M LMf[c K,&)\r kzD 'reset the source power 9jDV]!N4 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) -n?|,cO Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" `4'v)!? _UT>,c;h 'zero out irradiance array 7
}4T)k(a For i = 0 To ny - 1 :2^%^3+V For j = 0 To nx - 1 ~=lm91W irrad(i,j) = 0.0 #|v\UJ:Pf/ Next j @N7X(@O Next i X-|`|>3E
` Xhj7%> 'main loop _k\*4K8L EnableTextPrinting( False ) x>A(016:C .>zXz%p ypos = dety + pixely / 2 R^iF^IB For i = 0 To ny - 1 R3TdQ6j xpos = -detx - pixelx / 2 t.t$6+"5We ypos = ypos - pixely "diF$Lj &{!FE`ZC_ EnableTextPrinting( True ) elG<\[ Print i XpJT/&4 EnableTextPrinting( False ) {VE\}zKF 1#qyD3K yd$_XWp?\ For j = 0 To nx - 1 #(j'?|2o% ^ b{0|: xpos = xpos + pixelx e[$=5U~c 1\z5[
_ 'shift source \rn:/ LockOperationUpdates srcnode, True [w'Y3U\i GetOperation srcnode, 1, op \hai op.val1 = xpos ( n;# Z, op.val2 = ypos #K.OJJaG SetOperation srcnode, 1, op @Hw#O33/' LockOperationUpdates srcnode, False i^eU!^KF X!ZUR^ raytrace RZ#b)l DeleteRays w! ,~#hbt6 CreateSource srcnode u27K
0} TraceExisting 'draw -"Wp L2qD >B<jR$`6@ 'radiometry .t*MGUg For k = 0 To GetEntityCount()-1 5tdFd"oo If IsSurface( k ) Then 8C7$8x]mM temp = AuxDataGetData( k, "temperature" ) .aV#W@iyK emiss = AuxDataGetData( k, "emissivity" ) m X{_B!j^ If ( temp <> 0 And emiss <> 0 ) Then sgu#`@o ProjSolidAngleByPi = GetSurfIncidentPower( k ) 0"o%=i; frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) _CN5,mLNRk irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi pyhC%EZU End If )ZC0/>R ]&w8"q End If uDvZ]Q|. F`IV9qv Next k [0<N[KZ) f40 xS7-Q0 Next j m>B^w)&C ;*>Y8^K&Q Next i }G}2Y ( EnableTextPrinting( True ) m%hI@' <Dojl
# 'write out file UfIH!6Q fullfilepath = CurDir() & "\" & fname M:K5r7Q!yv Open fullfilepath For Output As #1 6yH(u}!. Print #1, "GRID " & nx & " " & ny ,7-@eZ Print #1, "1e+308" D]X&Va Print #1, pixelx & " " & pixely $L%gQkz_ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 P7np
-I* "I+71Ce maxRow = nx - 1 8 :B(}Y4K maxCol = ny - 1 &v9*D`7L For rowNum = 0 To maxRow ' begin loop over rows (constant X) uv,&/,;S row = "" "=8= G For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) uU_lC5A| row = row & irrad(colNum,rowNum) & " " ' append column data to row string hDBVL" Next colNum ' end loop over columns P(AcDG6K whFaL}2C Print #1, row 0}v_usP _voU^- Next rowNum ' end loop over rows f/+UD-@%m Close #1 zv/owK o^HzE;L} Print "File written: " & fullfilepath R8ZI}C1 Print "All done!!" Tk1U End Sub mz)Z
=`hy $}_a`~u 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: f4{O~?= p+6L qk< +'aG&^k4 找到Tools工具,点击Open plot files in 3D chart并找到该文件 EhJpJb[Z &IYSoA"Nz nz-( 8{ae 打开后,选择二维平面图: \ k&(D*u `wrN$&
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