| infotek |
2022-01-24 09:30 |
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。 /]=dPb% nBs%k!RR
成像示意图 [zp v3Uw 首先我们建立十字元件命名为Target b2;+a( >t2E034_ 创建方法: sjOyg!e 19od#
d3+ 面1 : 2mS3gk 面型:plane fuM+{1}/E 材料:Air |*079v 孔径:X=1.5, Y=6,Z=0.075,形状选择Box =j[zMO YxH"*)N
I8r5u=PH 辅助数据: Lq@pJ)a 首先在第一行输入temperature :300K, DXPiC[g] emissivity:0.1; V"n0"\k, 8zew8I~s
g0 ec- 面2 : V>}@--$c-r 面型:plane h?wNmLre 材料:Air fI"q/+ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box u}u;jTi>2 ;Ab`b1B '0_Z:\ laU 位置坐标:绕Z轴旋转90度, uG1
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S -j<O&h~C 辅助数据: .5+*,+- <VD^f 首先在第一行输入temperature :300K,emissivity: 0.1; %FnaS
u j.MpQ^eJ7 <b!ieK?\F3 Target 元件距离坐标原点-161mm; K
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?vL\VI9 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 T^h;T{H2 O@[c*3]e "&/:"~r 探测器参数设定: y3T-^ dj*%^cI 在菜单栏中选择Create/Element Primitive /plane t1p} xz#;F ,`ZR
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N SdhdXVZ 5T,Doxo P;[5#-e 元件半径为20mm*20,mm,距离坐标原点200mm。 G)\s{qk zmkqqiDp_ 光源创建: `j*&F8} Ju$= Tn 光源类型选择为任意平面,光源半角设定为15度。 Z;shFMu %]%.{W\j3 Lv@JfN"O 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。 BQWEC,*N [ P\3XSR 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。 fLK*rK^{"
2V(ye9 ~Nf01,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。 \dj&4u3 ?&Si P-G 创建分析面: @`2<^-r\ jI@0jxF 3#R~>c2 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。 DZ~w8v7V B]dHMLzl
)#[?pYd 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。 \FN"0P(G m`C(y$8fU FRED在探测器上穿过多个像素点迭代来创建热图 \&]M \ 6N(Wv0b $ 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。 RC Fb&,51 将如下的代码放置在树形文件夹 Embedded Scripts, /6}4<~~4TA sKIWr{D
flTK 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。 2|F.J G^ V ~w(^;o@ 绿色字体为说明文字, `+$'bNPn& L>$yslH;b '#Language "WWB-COM" [oOZ6\?HB 'script for calculating thermal image map zsA6(?)u 'edited rnp 4 november 2005 9)l-5o:D E^L 'declarations o:#l r{ Dim op As T_OPERATION r/=v;4.W Dim trm As T_TRIMVOLUME Vnuz!
6. Dim irrad(32,32) As Double 'make consistent with sampling Py\xN Dim temp As Double I=l() ET= Dim emiss As Double i;xH Dim fname As String, fullfilepath As String N kp>yVj tu6oa[s 'Option Explicit p3 I{ 1C+Y|p?KA Sub Main '-3AWBWI1 'USER INPUTS 9'3%%o nx = 31 u7G@VZ Ux5 ny = 31 P{5p'g , numRays = 1000 Cl[ '6Lk minWave = 7 'microns x3T)/'( maxWave = 11 'microns wl2rw93 sigma = 5.67e-14 'watts/mm^2/deg k^4 :gDIGBK, fname = "teapotimage.dat" 5%(J +d >
C{^{?~u Print "" mk_cub@ Print "THERMAL IMAGE CALCULATION" 4IG=mG) @/H1}pM~ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 Xtbuy/8"1 aq~hl7MTj Print "found detector array at node " & detnode :s+AIo6 2NAGXWE srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点
Tn2Z{.q$ 2<>n8 K Print "found differential detector area at node " & srcnode E4[
|=< ,kuJWaUC@ GetTrimVolume detnode, trm SSycQ4[{o detx = trm.xSemiApe D|Wekhm dety = trm.ySemiApe z*ZEw area = 4 * detx * dety sp0&"&5 Print "detector array semiaperture dimensions are " & detx & " by " & dety +mhYr]Z Print "sampling is " & nx & " by " & ny 5+rYk|*D+k QE84l 'reset differential detector area dimensions to be consistent with sampling *XS@Ku pixelx = 2 * detx / nx -(~Tu>KaH pixely = 2 * dety / ny x,IU]YW@ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 6@g2v^ % Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 f'F:U^ ma@ws,H 'reset the source power
dKDtj: SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) UoPd>q4Uj Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" j]rE0Og ?|TVz!3 'zero out irradiance array Ks@S5:9sp For i = 0 To ny - 1 LdI) For j = 0 To nx - 1 6[wej$u irrad(i,j) = 0.0 yxQxc5/X) Next j ,=B
"%=S Next i E:xpma1Qf 'IP'g,o++ 'main loop irqlU EnableTextPrinting( False ) kNUbH!PO 5[`!\vCiZ ypos = dety + pixely / 2 QW6F24 For i = 0 To ny - 1 #!rng]p xpos = -detx - pixelx / 2 #tN)OZA ypos = ypos - pixely "p.MJxH R!W!8rr3 EnableTextPrinting( True ) \ Print i ]
M"{=z EnableTextPrinting( False ) jIK*psaV [%YA42_`LD DF%\1C> For j = 0 To nx - 1 8NudY3cU! 8HX(1nNj} xpos = xpos + pixelx 3m#v|52oj Xw`vf7z* 'shift source "@W0Lk[ LockOperationUpdates srcnode, True t9&)9,my GetOperation srcnode, 1, op +c/am`` op.val1 = xpos cbsy&U op.val2 = ypos T=:O(R1*0 SetOperation srcnode, 1, op E:4`x_~qQ LockOperationUpdates srcnode, False o; { p&B98c raytrace Y4){{bEp DeleteRays }+#-\a2 CreateSource srcnode i&-g 0
TraceExisting 'draw "w9`UFu%^e Y"D'|i 'radiometry T.d+@ZV<# For k = 0 To GetEntityCount()-1 3^q,'!PfB If IsSurface( k ) Then j;<Yje&Wz temp = AuxDataGetData( k, "temperature" ) + Q
If7= emiss = AuxDataGetData( k, "emissivity" ) Yb%H9A If ( temp <> 0 And emiss <> 0 ) Then ;i^p6b j ProjSolidAngleByPi = GetSurfIncidentPower( k ) "u Xl frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) jiYYDGs77 irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi kwMuL>5 End If enj Ti5X <_uLf9ja End If -dsB@nPiUw ct3QtX0B Next k Z6!MX_ep - 6;0 x Next j 9b@L^]Kg M]!R}<]{ Next i Kw3fpNd EnableTextPrinting( True ) Z_}vjk~s Pqo_+fL+ 'write out file r7c(/P^$G fullfilepath = CurDir() & "\" & fname /[Vaf R! Open fullfilepath For Output As #1 ?xGxr|+a
Print #1, "GRID " & nx & " " & ny w8wF;:> Print #1, "1e+308" j.uN`cU! Print #1, pixelx & " " & pixely ] ^tor Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 +)^F9LPl iH#~eg maxRow = nx - 1 ;y%l OYm maxCol = ny - 1 `x lsvK> For rowNum = 0 To maxRow ' begin loop over rows (constant X) H;k;%Zg; row = "" 7fLLV2 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 1Z'cL~9 row = row & irrad(colNum,rowNum) & " " ' append column data to row string k
sJz44 Next colNum ' end loop over columns m( C7Fa
02Ur'| Print #1, row T [N:X0 xQ>c.}J/i Next rowNum ' end loop over rows %RL\t5TV Close #1 6i(V+ fa=#S Print "File written: " & fullfilepath 3%/]y=rA Print "All done!!" /wK5YN.em End Sub j2cLb <^UB@'lCm 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: KwN o/x|
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/ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 mn{8"@Z !
W$u~z +uM1#-+h 打开后,选择二维平面图: {:IOTy -g]/Ko]2@$
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