| infotek |
2020-11-18 10:58 |
十字元件热成像分析
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。 %[CM;|?B4 "^e?E:( 3
成像示意图 ]mT}
\b 首先我们建立十字元件命名为Target z7pXpy \ e;u8G/ 创建方法: RvZ-w$E&? TK?+O}v-]! 面1 : Gv3Fg[MA@c 面型:plane 6
&Aa b56 材料:Air k_^/ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box P&`r87J ;+KgujfU
O,Gn2Do 辅助数据: ]BBgU[O)
! 首先在第一行输入temperature :300K, wupD emissivity:0.1; ^aWNtY'
: 1>{-wL4rc 17 iq 面2 : Vxs`w 面型:plane z(68^-V=: 材料:Air Hu2g (! 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 'yjH~F. GQBN-Qv p+D6Z'B 位置坐标:绕Z轴旋转90度, ]H7Mx\ ?t P/VL
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*y 辅助数据:
r@UY$z X_@@v|UF 首先在第一行输入temperature :300K,emissivity: 0.1; Hxi=\2- ?O
Nw*"9 2/N*Uk 0 Target 元件距离坐标原点-161mm; jn Y3G ^{bEq\5&
*uM*)6O 3 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 VjMuU"++@ &J M;jSz o^6 j(~ 探测器参数设定: Mwk_SCy #vwXx r 在菜单栏中选择Create/Element Primitive /plane HN@)/5BY ?{")Wt
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,^C;1ph DK%eFCo<~ 元件半径为20mm*20,mm,距离坐标原点200mm。 7E)7sd EIm\!'R] 光源创建: b<7qmg3 e1Hx"7ew_ 光源类型选择为任意平面,光源半角设定为15度。 U8z"{ E=trJge !2I wuru 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。 K 5[ 3WHQ RtL'fd 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。 *4y r7~S5 Xy}S}9 X\RTHlw'] 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。 0VPa;{i/ KL`>mJo$ 创建分析面: 5Oq ;V:7 u)pBFs<dn )>p6h]]a 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。 ;d40:q< &N ;6G`3
itvdzPO 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。 r%n[PK^( &0`7_g7G FRED在探测器上穿过多个像素点迭代来创建热图 X_l,fu^C#$ $0t
%}DE FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 v%[mt`I 将如下的代码放置在树形文件夹 Embedded Scripts, t57b)5{FM (J*0/7
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XU7bWafy 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 V.1sZYA9 8{u01\0} 绿色字体为说明文字, -AQX-[B l?[DO?m+R '#Language "WWB-COM" XQ8Imkc 'script for calculating thermal image map IIZsN*^ 'edited rnp 4 november 2005 l!,{bOZ 2Oa-c|F 'declarations i$bBN$<b< Dim op As T_OPERATION y[rLk Dim trm As T_TRIMVOLUME _T$\$v$ { Dim irrad(32,32) As Double 'make consistent with sampling H"l'E9k.&p Dim temp As Double b.;W|$ . Dim emiss As Double GZo4uwG@a Dim fname As String, fullfilepath As String p%-9T>og }^q#0`e(y 'Option Explicit 0*^Fk=>ej :83"t-O8[ Sub Main Zpmy)W]1
'USER INPUTS #UQ[8e nx = 31 Xc^~|%+ ny = 31 .w~USJ=X numRays = 1000 ,R+u%bmn# minWave = 7 'microns T2{+fRvN maxWave = 11 'microns u+_#qk0NfK sigma = 5.67e-14 'watts/mm^2/deg k^4 2 OTpGl fname = "teapotimage.dat" ?H&p zY~H F`u~Jx8.* Print "" %`'VXR?`h= Print "THERMAL IMAGE CALCULATION" &bRH(yF (Wn'.|^% detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 $/H'Dt6x q}jf&xUWzH Print "found detector array at node " & detnode c
z|IBsa* w3@te\ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 & \m\QI 0CROq} Print "found differential detector area at node " & srcnode sq_:U_tJ ,n*.Yq GetTrimVolume detnode, trm ?HY0@XILI detx = trm.xSemiApe o2~x'*A0I dety = trm.ySemiApe FyEl@ }W area = 4 * detx * dety uOQ5.S+ Print "detector array semiaperture dimensions are " & detx & " by " & dety 5
Jhl4p}w Print "sampling is " & nx & " by " & ny TI332,eL Ogb_WO;) 'reset differential detector area dimensions to be consistent with sampling W5p}oN pixelx = 2 * detx / nx kBzzi^cl pixely = 2 * dety / ny i,'~Ds SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False IQDWH/c Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 e([&Nr8h D&shrKFx 'reset the source power { at;
U@o SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) C\{4<:<_& Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" jnTl%aQYc 89paR[ 'zero out irradiance array {x8`gP\H For i = 0 To ny - 1 +K?h]v]% For j = 0 To nx - 1 F!xK#~e irrad(i,j) = 0.0 4Qv|Z+$i Next j W.a/k7 p Next i Xk2
75Y G 1$l %B 'main loop $3L7R EnableTextPrinting( False ) &l Q j?] $?\],T ypos = dety + pixely / 2 W{0:8_EI For i = 0 To ny - 1 *%O1d., xpos = -detx - pixelx / 2 8<^,<? ypos = ypos - pixely EP[
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EnableTextPrinting( True ) =4zsAa Print i MiC&av EnableTextPrinting( False ) /Hx\ gtV #'T|,xIr-Q U|zW_dj For j = 0 To nx - 1 9qpH 8j+ SBEJ@&iB~ xpos = xpos + pixelx [ACYd/ <ESAoY"RPN 'shift source H.9 J}k1S LockOperationUpdates srcnode, True Cpj_mMtu GetOperation srcnode, 1, op DirWe op.val1 = xpos 4MM#\ op.val2 = ypos eN$~@'w SetOperation srcnode, 1, op IQM!dC LockOperationUpdates srcnode, False 4nY2v['m0 {M$1?j"7 'raytrace +LUL-d DeleteRays T>c;q%A/ CreateSource srcnode 5}m2D=' TraceExisting 'draw ?eu=0|d F kWJB> 'radiometry \z_@.Jw{ For k = 0 To GetEntityCount()-1 ;7hf'k If IsSurface( k ) Then +z4NxR
temp = AuxDataGetData( k, "temperature" ) [)*fN|Hy emiss = AuxDataGetData( k, "emissivity" ) }$7Hf+G If ( temp <> 0 And emiss <> 0 ) Then ]8mBFr5E9 ProjSolidAngleByPi = GetSurfIncidentPower( k ) &L/C:<. frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) %pMW5]H irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 6wF?FtT End If H(pOR<` EGs z{c[8@ End If Kg.E~ YFW+l~[# Next k toQn]MT F/!C=nS Next j $/D@=Pkc 9A6ly9DIS Next i y,%w` EnableTextPrinting( True ) ^)SvH sOHh&e 'write out file A.y$.( fullfilepath = CurDir() & "\" & fname Jjy}m0)#W_ Open fullfilepath For Output As #1 97
1qr Print #1, "GRID " & nx & " " & ny 46 77uy Print #1, "1e+308" f6m^pbQFl Print #1, pixelx & " " & pixely
W6a2I Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 MM97$ jReI+
pS maxRow = nx - 1 p0@iGyd maxCol = ny - 1 %TLAn[LW( For rowNum = 0 To maxRow ' begin loop over rows (constant X) ;BI{v^()s row = "" 9)=as/o For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) Jus)cO#I row = row & irrad(colNum,rowNum) & " " ' append column data to row string xOkf9k_ Next colNum ' end loop over columns xUG|@xIwc X=DJOepH' Print #1, row onjTuZ^h ~zuMX;[ Next rowNum ' end loop over rows cd:O@)i Close #1 |5O%@ 2bCa|HTv Print "File written: " & fullfilepath 1s*I
Print "All done!!" $mpfr#!&3o End Sub UboOIx5: $H_4Y-xOi 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: ok7DI R+^/(Ws'< @]OI(B 找到Tools工具,点击Open plot files in 3D chart并找到该文件 BG'gk#J+f /]YK:7*98 '2%hc\P6P 打开后,选择二维平面图: `_f3o,5 B$7lL
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