| 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。 fJC,ubP[5 SVo`p;2r
成像示意图 ~qT+sc!t 首先我们建立十字元件命名为Target ~dwl7Qc $mOK|=tI_ 创建方法: yx }Z:t Ic/<jFZXM 面1 : K~WwV8c9; 面型:plane QrPWS-3~! 材料:Air }q
?iJ?P 孔径:X=1.5, Y=6,Z=0.075,形状选择Box (Qq$ql27 #UJ@P Dwil
uS|Zkuk[! 辅助数据: E|Grk 首先在第一行输入temperature :300K, }H,A
T emissivity:0.1; q+o(`N'~G VuZmX1x)N cY>;( x@ 面2 : lv ^=g 面型:plane GW{Nc!) 材料:Air RGtUKr' 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ~ab"q% N]yk<55 *<#&ne8 位置坐标:绕Z轴旋转90度, 1ck2Gxn 6v1#i
}RUC#aW1 辅助数据: qW<: `y oa1a5+A 首先在第一行输入temperature :300K,emissivity: 0.1; Vq'&t<K# tXKhkt` ak;Z; Target 元件距离坐标原点-161mm; p-;]O~^ ]-fZeyY$
>uJrq""+ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 "3j0) up2%QbN( iKS9Xss8 探测器参数设定: d)o<R;F rjR 在菜单栏中选择Create/Element Primitive /plane a*IJ)'S Z21XlbK
[bOy,^@4 {U(h]' $oua]8! !s)$_tG 元件半径为20mm*20,mm,距离坐标原点200mm。 (I~,&aBr b]g.>$[nX 光源创建: v}Aw!Dv/ Zz3#Kt5t3 光源类型选择为任意平面,光源半角设定为15度。 ?<LG(WY .D>lv_kp _RmE+ Xg2 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 rP\7C+ =0]Mc$Ih 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。 YHRI U Yd eO9nn9lql [a
|fm*B! 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。 ckP3[@Su { 9H)uTyuNi 创建分析面: c3pt?C XWUTb\@ P`%ppkzV6 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。 X%F9.<4 ;_SS3q
&S-& 'ZAY 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。 q}1$OsM bT*4Qd4W FRED在探测器上穿过多个像素点迭代来创建热图 JZnWzqFw OLR1/t`V FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 <V8i>LBlz 将如下的代码放置在树形文件夹 Embedded Scripts, Z{CL! 6b8Klrar!
i-=ff 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 LK%B6-;~- {pg@JA 绿色字体为说明文字, [:=[QlvV Kk(ucO '#Language "WWB-COM" 7w$R-Y/E 'script for calculating thermal image map c]n03o 'edited rnp 4 november 2005 &B85; ;VH]TKkk 'declarations @/u`7FO$& Dim op As T_OPERATION 7fEV/j Dim trm As T_TRIMVOLUME 9]w0zUOL6 Dim irrad(32,32) As Double 'make consistent with sampling :y
%~9= Dim temp As Double 1G;Ns] u Dim emiss As Double ri;M7rg`.{ Dim fname As String, fullfilepath As String Ww@;9US 3 ^0
lPv!2 'Option Explicit iLgt_@g D6oby*_w Sub Main I7_D $a= 'USER INPUTS IjRmpVcwN nx = 31 -Mvw'#(0 ny = 31 MdjLAD)f+C numRays = 1000 ;X6y.1N~ minWave = 7 'microns F)5Aq H/p maxWave = 11 'microns >z
-(4Z sigma = 5.67e-14 'watts/mm^2/deg k^4 )89jP088V fname = "teapotimage.dat" A
m1W<` 5gEfhZQ Print "" 2ML6Lkk Print "THERMAL IMAGE CALCULATION" QX=;,tr kZ}u detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 L
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. j^US^ Print "found detector array at node " & detnode TjK5UML _fCHj$I*] srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 .rm7Sd4K PZR%8 m}]u Print "found differential detector area at node " & srcnode wIj2 IAD EM/+1
_u GetTrimVolume detnode, trm q$rA-`jw detx = trm.xSemiApe Y]K]]Ehp dety = trm.ySemiApe Av>j+O ; area = 4 * detx * dety 1n(}Q1fa Print "detector array semiaperture dimensions are " & detx & " by " & dety #jx?uS Print "sampling is " & nx & " by " & ny 2vN(z%p wT=hO+ 'reset differential detector area dimensions to be consistent with sampling 7YjucPH# pixelx = 2 * detx / nx \=V[ba:q pixely = 2 * dety / ny P$>kBW53 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False BQ:Kx _
Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 kte.E%.PE ] *VF Ws 'reset the source power
73ljW SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 'sBXH EZA] Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 2rtP.*dd }C"*ACjF 'zero out irradiance array ydqmuZ%2h# For i = 0 To ny - 1 +%\j$Pv For j = 0 To nx - 1 V FSn!o:C irrad(i,j) = 0.0 (zDk68=v Next j e=UVsYNx Next i i!oj&& F'$S!K58 'main loop TK/'=8 EnableTextPrinting( False ) \g1@A" Q9xx/tUW ypos = dety + pixely / 2 `$SEkYdt For i = 0 To ny - 1 uEGPgYY ( xpos = -detx - pixelx / 2 lO:{tV ypos = ypos - pixely ~yH>Ko9F} +Z<Q^5w@ EnableTextPrinting( True ) nCMa$+ Print i NVqC|uEAF EnableTextPrinting( False ) ![]I%'s qZsddll 8{ Eo8L'V For j = 0 To nx - 1 LZC?383' <N=p:e,aN, xpos = xpos + pixelx `h9)`* YQ@6innT 'shift source Rw\C0' LockOperationUpdates srcnode, True %SO%{.}Zf GetOperation srcnode, 1, op &:CjUaP@ op.val1 = xpos <I%9O:R
op.val2 = ypos zMYd|2bc SetOperation srcnode, 1, op m?VRX.> LockOperationUpdates srcnode, False .83v~{n !HjNx%o5< 'raytrace DGZY~(] DeleteRays %^5 @z1d, CreateSource srcnode M1^C8cz TraceExisting 'draw 51M^yG&M 1:x nD 'radiometry <VaMUm<2 For k = 0 To GetEntityCount()-1 Pb8Z))9j If IsSurface( k ) Then "8muMa8Q% temp = AuxDataGetData( k, "temperature" ) VHT@s7u0" emiss = AuxDataGetData( k, "emissivity" ) Lcs{OW, If ( temp <> 0 And emiss <> 0 ) Then y /:T(tk$ ProjSolidAngleByPi = GetSurfIncidentPower( k ) ~x4B/zW? frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) #xP!!.DF( irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi $?)3&\)R End If sVZZp H
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T N End If
~kYqGH x1BOW Next k ^5^}MB% {y^|ET7 Next j t+ S~u^ hyOm9WU Next i Sc'c$/ EnableTextPrinting( True ) U$A7EFK' PNJe&q0* 'write out file 0Ox|^V fullfilepath = CurDir() & "\" & fname $,;S\JmWP Open fullfilepath For Output As #1 P YF.#@":& Print #1, "GRID " & nx & " " & ny "@{4.v^}! Print #1, "1e+308" >nhE%:X> Print #1, pixelx & " " & pixely >Qm<-g Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 [{@zb-h d=?Mj] maxRow = nx - 1 ~y)bYG!G maxCol = ny - 1 {,Bb"0 \ For rowNum = 0 To maxRow ' begin loop over rows (constant X) )8$:DW; row = "" X7H'Uk9: For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) Vm~qk row = row & irrad(colNum,rowNum) & " " ' append column data to row string mLg{6qm(q Next colNum ' end loop over columns ;vJ\]T ml Eq=wdI Print #1, row p?V?nCv1O 6QII&Fg Next rowNum ' end loop over rows |"R_-U Close #1 DikdC5>O>m `V&1]C8x Print "File written: " & fullfilepath }Kj Ju; Print "All done!!" .kc"E End Sub T A\4uy6o 382* 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: %AG1oWWc>. '%SR. JL PFS;/ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 1yBt/U2 h(@R]GUX ?< cM^$lI> 打开后,选择二维平面图: %kh#{*q$ E dn[cH7
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