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。 9AVK_ K*HVn2OV
成像示意图 ${TB2q}% 首先我们建立十字元件命名为Target J#Ne:Aj_ ;:-2~z~~ 创建方法: zal3j^ hIzPy3 面1 : .^9/ 0.g8t 面型:plane TeGLAt
材料:Air
eo<~1w 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Ol/2%UJXL jziA;6uL
{R1Cxt} 辅助数据: %Zl_{Q]h 首先在第一行输入temperature :300K, RBv= emissivity:0.1; ,h wf psyH?&T L!+[]tB 面2 : 1^WA 面型:plane g1hg`qBBW 材料:Air H z< M 孔径:X=1.5, Y=6,Z=0.075,形状选择Box yN WbI0a 1CS]~1Yp: ^Lg{2hjj 位置坐标:绕Z轴旋转90度, ZAnO$pA F"@'(b
#r:Kg&W2FO 辅助数据: `aX}.{.! N?U&(@p 首先在第一行输入temperature :300K,emissivity: 0.1; cVP49r}}v 0| DG\&? 2)I'5?I Target 元件距离坐标原点-161mm; %.6?\w1e *> &N
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rY_C3;B 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 k>z-Zg vS*0CR\ \ \mO+N47i 探测器参数设定: @x-GbK? `aWwF}
+Y 在菜单栏中选择Create/Element Primitive /plane uy*x~v*I] <,]CVo
{If2[4!z .+JPtL f@.Q%+!4 Vp-OGX[ 元件半径为20mm*20,mm,距离坐标原点200mm。 Bdk{.oh6 TeN1\rA, 光源创建: yg[Oy#^ yV]-Oa$*s0 光源类型选择为任意平面,光源半角设定为15度。 ~NW5+M(u 2S10j%EeI EV7+u0uN&Q 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 OAnn`*5Up vM4`u5 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 >0;"qT ? Ge*~d CR<pB)F?a 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 j
BQqpFH9 4oaP"T@6 创建分析面: ,"MUfZ \3:{LOr%* hr}R,BR| 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 ^CZ|ci6bX -{amzyvLE
mBgx17K/-_ 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 6pz:Lfd80 {j=hQL3 FRED在探测器上穿过多个像素点迭代来创建热图 #pn AK 0@/E%T1c" FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 o >4>7
将如下的代码放置在树形文件夹 Embedded Scripts, N, +g/o\f hG3$ ]i9
]A<u eM 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。 _.8]7f`*Gc PH4bM 绿色字体为说明文字, j8A R# 9DAwC:<r '#Language "WWB-COM" >`V|`Zi ? 'script for calculating thermal image map 7Hlh
(k 'edited rnp 4 november 2005 K[;,/:Y 3\l9Sf=M| 'declarations 3LnyQ Dim op As T_OPERATION y?4=u,{C Dim trm As T_TRIMVOLUME <W|{)U?p Dim irrad(32,32) As Double 'make consistent with sampling Zu73x#pI Dim temp As Double .;v'oR1x5 Dim emiss As Double )PNH| h Dim fname As String, fullfilepath As String =xWW+w!r SSM>
ID 'Option Explicit T`<k4ur 2<. /HH*f Sub Main [&kk 'USER INPUTS Us~wv"L=UX nx = 31 tfIBsw.
ny = 31 6]A\8Ty numRays = 1000 | BWK"G minWave = 7 'microns 3A/MFQ#2 maxWave = 11 'microns qvE[_1QCc sigma = 5.67e-14 'watts/mm^2/deg k^4 w)SxwlW} fname = "teapotimage.dat" -ns a3P ;j\$[4W.i Print "" \bmboNe Print "THERMAL IMAGE CALCULATION" ^
/eSby 3'uES4+r detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 {YLJKu!M
SL5DWZ Print "found detector array at node " & detnode m64\@
[ WSccR srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 X
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> S5vMP
N Print "found differential detector area at node " & srcnode I{UB!0H %pKs- n` GetTrimVolume detnode, trm =U|SK"oO detx = trm.xSemiApe u+FftgA dety = trm.ySemiApe F?Nk:#
V area = 4 * detx * dety .5 r0% Print "detector array semiaperture dimensions are " & detx & " by " & dety *njB
fH' Print "sampling is " & nx & " by " & ny %cjav F<<H [,%0 'reset differential detector area dimensions to be consistent with sampling [<Puh pixelx = 2 * detx / nx pODo[Rkq pixely = 2 * dety / ny v333z<<S SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False S$:S*6M@" Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 2Ps`!Y5 &,|uTIs 'reset the source power 3ZZI1_j SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) =v"{EmT[$ Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" Z4sjH1W vxZUtyJfe 'zero out irradiance array ;8kfgpM_ For i = 0 To ny - 1 ~u1JR`y For j = 0 To nx - 1 FJ.
:*K[ irrad(i,j) = 0.0 #Jb$AA!z Next j -<.NEV Next i ur5n{0# [$+61n}.12 'main loop zOp"n\ EnableTextPrinting( False ) (jMp`4P c67!OHu mP ypos = dety + pixely / 2 j0M;2 3@[ For i = 0 To ny - 1 : P2;9+v xpos = -detx - pixelx / 2 5n#&Hjb*F0 ypos = ypos - pixely ZXkAw sr m>:ig\ EnableTextPrinting( True ) EFO Q;q Print i NE nP3A EnableTextPrinting( False ) 9LRY (#BA{9T,^ ,PAKPX9v_F For j = 0 To nx - 1 l)bUHh5[ LRgk9*@, xpos = xpos + pixelx 6P$q7G S)h1e%f,
f 'shift source 1yf&ck1R LockOperationUpdates srcnode, True r73Xh"SL GetOperation srcnode, 1, op 81g0oVv op.val1 = xpos ?+_"2XY op.val2 = ypos VW/1[?HG5 SetOperation srcnode, 1, op 93,ExgFt LockOperationUpdates srcnode, False :eO0{JN4T sk/Mh8z 'raytrace O^hV<+CX DeleteRays Su^Z{ Ud` CreateSource srcnode ABf#!G TraceExisting 'draw ]|(?i ,p Nrh`DyF0D! 'radiometry tL|Q{+i
yE For k = 0 To GetEntityCount()-1 u[@*}|uXM If IsSurface( k ) Then n9ih^H temp = AuxDataGetData( k, "temperature" ) v4zARE9# emiss = AuxDataGetData( k, "emissivity" ) &kt#p;/p? If ( temp <> 0 And emiss <> 0 ) Then ==9Ez ProjSolidAngleByPi = GetSurfIncidentPower( k ) 1owoh,V6 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) =X):Zi irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi #{a <{HX End If <Do89 8iB}a\]B End If fk_i~K p-_j0zv Next k fC[gu$f][ 0rj* SC_ Next j 7#`:m|$ XafyI*pOX Next i ~f:fOrLE# EnableTextPrinting( True ) :yeTzIz] `Hqu2
'` 'write out file }I0^nv1 fullfilepath = CurDir() & "\" & fname Kk#@8h> Open fullfilepath For Output As #1 }#1{GhsS Print #1, "GRID " & nx & " " & ny >Ww F0W9? Print #1, "1e+308" I&9B^fF6 Print #1, pixelx & " " & pixely g}7B0 yo Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 'lF|F+8 PC5FfX maxRow = nx - 1 JP]K\nQx' maxCol = ny - 1 )/Vr 5b@ For rowNum = 0 To maxRow ' begin loop over rows (constant X) X,b}d#\ row = "" -$rfu For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) gkjZX
wp row = row & irrad(colNum,rowNum) & " " ' append column data to row string I <7K^j+5: Next colNum ' end loop over columns qi$8GX=~r 3 ren1 Print #1, row +}!eAMQ spf}{o Next rowNum ' end loop over rows i8]r}a Close #1 s?G@k} { i.]}ooI Print "File written: " & fullfilepath RDbA"e5x Print "All done!!" Lv"83$^S9 End Sub b]~M$y60q D'X'h}+2 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: {XAKf_Cg DRnXo-Aaj x+&&[>-P 找到Tools工具,点击Open plot files in 3D chart并找到该文件 XpGom;z^c :5(TOF kF5}S8B 打开后,选择二维平面图: n\ZFPXP
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