| 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。 53c 0
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成像示意图 +zrAG24q 首先我们建立十字元件命名为Target I/M _p^ RG3l.jL 创建方法: 5K^69mx a^Tmu 面1 : 90|7ArM_[ 面型:plane ^Y u6w\QM 材料:Air YFE&r 孔径:X=1.5, Y=6,Z=0.075,形状选择Box zrR`ecC(b ?q(\=;Y
smdZxFl 辅助数据: %7#-%{ 首先在第一行输入temperature :300K, u$*56y emissivity:0.1; y_*PQZ$c< /CuXa%Ci^ t<T[h2Wd 面2 : AS E91T~ 面型:plane %{(x3\ *& 材料:Air Zq,9&y~ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box K`/`|1 1z&Ly3 nB%;S 位置坐标:绕Z轴旋转90度, N;A@'
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J8M$k/"X 辅助数据: %9k!A]KD V[}4L|ad 首先在第一行输入temperature :300K,emissivity: 0.1; NE/m-ILw \A#1y\ok nSF``pp+ Target 元件距离坐标原点-161mm; fwrJ!j yu6`66h)
f6_];]yP 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ^qg?6S4 1"pI^Ddt s[K^9wz 探测器参数设定: Aub]IO~ i^_#%L 在菜单栏中选择Create/Element Primitive /plane :l2g# * c 4q'B<7{Q
e$u4vC~ iT;@bp yC3yij<oR 9Ro6fjjE 元件半径为20mm*20,mm,距离坐标原点200mm。 N0K){ R*oXmuOsYA 光源创建: I=7Y]w= @WQK>-=(3 光源类型选择为任意平面,光源半角设定为15度。 i]=&
cXR1grz $`8Ar,Xz` 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 ik"sq}u_]E ],ZzI 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 277ASCWLkU zF@o2<cD@ mCs#.%dU 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 op"$E1+ hY*0aZ|( 创建分析面: zVi15P$ Z1ALq5 +B'8|5tPX 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*g(q0N<S Q|,B*b
^pS+/ZSi^ 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。 xy8#2 T/c<23i FRED在探测器上穿过多个像素点迭代来创建热图 |+:h|UIUQ Xt{*N-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。 $s4Wkq 将如下的代码放置在树形文件夹 Embedded Scripts, ;uqx@sx ; [k[u*5hP|F
sowd`I~ 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 9Ew7A(BG_3 b$Hz3TJ( 绿色字体为说明文字, `gpQW~*R-; nx:KoB"ny '#Language "WWB-COM" ckjrk 'script for calculating thermal image map 2oZ9laJO 'edited rnp 4 november 2005 e8h,,:l3j tu>{ 'declarations '.Ym!r~wL Dim op As T_OPERATION W%e_~$H0 Dim trm As T_TRIMVOLUME K9[e> Dim irrad(32,32) As Double 'make consistent with sampling G~wF nl% Dim temp As Double `_5GG3@Ff Dim emiss As Double {kLGWbo|Q Dim fname As String, fullfilepath As String Fl{WAg LF?P>
1%- 'Option Explicit mPPk)qy 4KI [D{ Sub Main F_ 7H!F 'USER INPUTS 85|fyX nx = 31 ]h!`IX ny = 31 a$9A(Pte numRays = 1000 j2M+]Zp. minWave = 7 'microns $P:
O/O=> maxWave = 11 'microns /%n`V sigma = 5.67e-14 'watts/mm^2/deg k^4 "PH6e bm fname = "teapotimage.dat" ciMM^ZRIb ;pJ2V2 g8 Print "" RGD]8mw Print "THERMAL IMAGE CALCULATION" V&Mf:@y ;`v% sx# detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 b-@\R\T Y\+KoR'; Print "found detector array at node " & detnode DlyMJ#a )F pJ1 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 Gzt=u"FV ~S; Z\ Print "found differential detector area at node " & srcnode Qbeeq6 9.M{M06; GetTrimVolume detnode, trm XTqm] detx = trm.xSemiApe :Dl%_l dety = trm.ySemiApe 4B-yTyO area = 4 * detx * dety V/"}ku Print "detector array semiaperture dimensions are " & detx & " by " & dety Omag)U)IPh Print "sampling is " & nx & " by " & ny {UH9i'y:t ujgLJ77 'reset differential detector area dimensions to be consistent with sampling v })Q pixelx = 2 * detx / nx noNm^hFL pixely = 2 * dety / ny `_ (~ Ud SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ivrXwZ7jT Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 %85Icg dEp/dd~(& 'reset the source power $zkH|]
zZ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) u/AT-er; Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" ~U}Mv{y m-1?\bs 'zero out irradiance array
L2-^!' For i = 0 To ny - 1 0jB X5 For j = 0 To nx - 1 }qC SS<a irrad(i,j) = 0.0 'pP-rdx Next j @?&Wm3x9 Next i fk5XvL 2HOe__Ns 'main loop Q!CO0w EnableTextPrinting( False ) w;yx<1f +lp{#1q0 ypos = dety + pixely / 2 73DlRt
* For i = 0 To ny - 1 @?2n]n6 xpos = -detx - pixelx / 2 %my ypos = ypos - pixely 02 f9 w V ?ow'^X- EnableTextPrinting( True ) N&;\PfG Print i 3-Y=EH_0 EnableTextPrinting( False ) dl[ob,aCK (Nz]h:}r 9[>Lp9l' For j = 0 To nx - 1 6S*zzJ.0K t.3\/ xpos = xpos + pixelx r7XD&Y ^eTZn[qH>w 'shift source B!q?_[k, LockOperationUpdates srcnode, True ^!@*P,'I GetOperation srcnode, 1, op aR(E7mXQ op.val1 = xpos &X w`T9< op.val2 = ypos w yD%x( SetOperation srcnode, 1, op \8_V(lU
LockOperationUpdates srcnode, False _'*DT=H'U {a4xF2 'raytrace ZDlu1>Q DeleteRays ib50LCm CreateSource srcnode $y6rvQ
2>S TraceExisting 'draw *98Ti| m'.T2e.u 'radiometry cHn;}l!I For k = 0 To GetEntityCount()-1 3W j,} If IsSurface( k ) Then M'|)dM| temp = AuxDataGetData( k, "temperature" ) C5B=NAc emiss = AuxDataGetData( k, "emissivity" ) ~|=rwDBZ8l If ( temp <> 0 And emiss <> 0 ) Then JTkCk~bX[z ProjSolidAngleByPi = GetSurfIncidentPower( k ) !d|8'^gc frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) nL\ZId irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi vcOsq#UW End If O2@"
w23 fB[\("+ End If b7f0#*(? xc*!W*04 Next k ;E2~L ;x RjQR Next j <"NyC?b+G hwZ6. Next i
"0<Sd?Sz EnableTextPrinting( True ) \v s%U}IrO _}z_yu#jY 'write out file 6#?NL]A fullfilepath = CurDir() & "\" & fname ${0%tCE Open fullfilepath For Output As #1 z-)*Q Print #1, "GRID " & nx & " " & ny )1BiEK`v Print #1, "1e+308" oEPNN'~3 Print #1, pixelx & " " & pixely xLLC)~ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 o>$|SU!a ?V6 %>RU maxRow = nx - 1
j$%yw4dsj maxCol = ny - 1 UJ9q-r For rowNum = 0 To maxRow ' begin loop over rows (constant X) F42TKPN^uu row = "" eTT^KqE>& For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ->Q`'@'|P row = row & irrad(colNum,rowNum) & " " ' append column data to row string t0I>5#*WU Next colNum ' end loop over columns 5@CpP-W# v s w7| Print #1, row GW:\l~ d qU}lGf!dVn Next rowNum ' end loop over rows \ p1K(H Close #1 Qh
1q PGMv(}%; Print "File written: " & fullfilepath L;nZ0)@@l Print "All done!!" S]5VEn;pV End Sub vx PDC~3; CF,8f$: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: QId"Cl)3 @-}D7? y`\mQ48V 找到Tools工具,点击Open plot files in 3D chart并找到该文件 (v|ixa Q*,6X*W!~ (q~R5)D 打开后,选择二维平面图: J.*[gt%O| 2Ti" s -
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