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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。 O<I- ~>G^=0LT 成像示意图 \^LFkp 首先我们建立十字元件命名为Target +_`7G^U?% 5^cCY'I 创建方法: #z(]xI)" .X&9Q9T=# 面1 : -4K5-|>O 面型:plane }b}m3i1 材料:Air gr{ DWCK 孔径:X=1.5, Y=6,Z=0.075,形状选择Box |:o4w _GPe<H 3R/bz0 V> 辅助数据: >_TZ'FT 首先在第一行输入temperature :300K, ,+VGSd emissivity:0.1; 0_/[k*Re yu|>t4#GT 3%6?g* 面2 : eE Kf|I 面型:plane :3PH8TL 材料:Air 46x'I( 孔径:X=1.5, Y=6,Z=0.075,形状选择Box AX INThJ cNrg#Asen& hoP]9&<T 位置坐标:绕Z轴旋转90度, XZf$K _F&M + 3gp%`c4 ^q&x7Kv% 辅助数据: *a)n62 !Cs_F&l"j 首先在第一行输入temperature :300K,emissivity: 0.1; X2_=agEP y5r4&~04 km(Po} Target 元件距离坐标原点-161mm; s~>}a #tHK"20 n<,BmVQ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 &m3lXl wkq 66? NbobliC= 探测器参数设定: "%_+-C<L4 e.C)jv6qr 在菜单栏中选择Create/Element Primitive /plane (Z*!#}z` #E?4E1bnB siaG'%@*r ' QG?nu `uFdwO'DD <%d>v-=B 元件半径为20mm*20,mm,距离坐标原点200mm。 Z;i:]( ^~dWU> 光源创建: :/#rZPPF 45e~6", 光源类型选择为任意平面,光源半角设定为15度。 QZs!{sZ ig!+2g CAJ'zA|o 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 _w{Qtj~s| .H|-_~Yx| 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 *hx .8R@2c`}Cs osRy e3 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 +TJCLZ..
2iOV/=+ 创建分析面: 8mMQ[#0:} f 2.HF@ 3<!7>]A 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 2HdC |$_+ XUYtEf QY/w 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。 d~H`CrQE* $X6h|?3U, FRED在探测器上穿过多个像素点迭代来创建热图 Ie_wHcM< t!XwW$@ 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。 WLT"ji0w2 将如下的代码放置在树形文件夹 Embedded Scripts, (e~N q +2{Lh7Ks Oz95 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。 6N4~~O
)2.Si# 绿色字体为说明文字, nKY6[|!# = [E '#Language "WWB-COM" +whDU2 " 'script for calculating thermal image map siI;"? 'edited rnp 4 november 2005 XTyxr KPF1cJ2N 'declarations !a`&O-ye Dim op As T_OPERATION T[gv0|+ Dim trm As T_TRIMVOLUME (HVGlw'` Dim irrad(32,32) As Double 'make consistent with sampling EwN}l Dim temp As Double zfU{Kd Dim emiss As Double G[=c
Ss, Dim fname As String, fullfilepath As String Dtk=[;"k2a S'" Df5 'Option Explicit C]6O!Pb0 Vksuu@cch Sub Main Da|z"I
x 'USER INPUTS AH^/V}9H nx = 31 80I#TA6C ny = 31 ^c|/*u numRays = 1000 kmW4:EA% minWave = 7 'microns 7I}uZ/N maxWave = 11 'microns d=(mw_-? sigma = 5.67e-14 'watts/mm^2/deg k^4 *w&e\i|7 fname = "teapotimage.dat" ax`o>_) jd:6:Fm Print "" zPO9!?7| Print "THERMAL IMAGE CALCULATION" HN"Z]/5j &
21%zPm detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 e+WNk
2 7#Ft|5$~q Print "found detector array at node " & detnode COlqcq'qAu /:
"1Z]@ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 5!
{D! -RwE%cr Print "found differential detector area at node " & srcnode \e*]Ls#jS :Ye !w$r GetTrimVolume detnode, trm ]^E?;1$f? detx = trm.xSemiApe ye&;(30Oq dety = trm.ySemiApe =cI(d , area = 4 * detx * dety RZLq]8pM Print "detector array semiaperture dimensions are " & detx & " by " & dety lA]8&+,ZM Print "sampling is " & nx & " by " & ny {)XTk&" ?s01@f# 'reset differential detector area dimensions to be consistent with sampling uRvP hkqm pixelx = 2 * detx / nx k[xSbs'D pixely = 2 * dety / ny K+eM SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False L *wYx| Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 3og.y+.=U. [txE .7p 'reset the source power t.<i:#rj>l SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) X?O[r3< Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" i1UsIT XFl6M~ c 'zero out irradiance array WWY6ha For i = 0 To ny - 1 ytImB`'\ For j = 0 To nx - 1 Txu/{M, irrad(i,j) = 0.0 $Sq:q0 Next j !$JT e Next i * 4'"2" J.a]K[ci 'main loop :WEDAFq0 EnableTextPrinting( False ) 5pX6t _BufO7`. ypos = dety + pixely / 2 `5*}p#G For i = 0 To ny - 1 |!ELV7?( xpos = -detx - pixelx / 2 dtDFoETz ypos = ypos - pixely 9 hl_|r~%* .-zom~N-? EnableTextPrinting( True ) pa+hL,w{6 Print i 2?C)& EnableTextPrinting( False ) ]Wup/o c<~H(k'+c F59 TZI For j = 0 To nx - 1 KNl$3nX _`X:jj> xpos = xpos + pixelx l1I#QB@5n @7}W=HB 'shift source X$
D6Ey LockOperationUpdates srcnode, True mpyt5#f GetOperation srcnode, 1, op h[ ZN+M op.val1 = xpos 4euO1= op.val2 = ypos gGYKEq{j( SetOperation srcnode, 1, op JF]JOI6.e LockOperationUpdates srcnode, False (Ld i|jL kZ~~/?B raytrace ib m4fa DeleteRays rv;3~'V CreateSource srcnode S:}7q2: TraceExisting 'draw 4H/OBR _1^'(5f$ 'radiometry f);FoVa6 For k = 0 To GetEntityCount()-1 Ri'n If IsSurface( k ) Then pg.%Pdr<$ temp = AuxDataGetData( k, "temperature" ) UiWg<_<t emiss = AuxDataGetData( k, "emissivity" ) NK+o1 If ( temp <> 0 And emiss <> 0 ) Then 9WHddDA ProjSolidAngleByPi = GetSurfIncidentPower( k ) AA_%<zK frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) <@}9Bid!o irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi bt *k.=p End If }Z>)DN=+ -Za/p@gM End If pAEx#ck (H]AR8%W Next k k)u[0} L];b<*d Next j '-6~tWC~7 & kIFcd@ Next i #$vEGY}1 EnableTextPrinting( True ) Rcv9mj]l $>gFf}#C 'write out file rNM;ZPF# fullfilepath = CurDir() & "\" & fname J,G
lIv.A Open fullfilepath For Output As #1 |qLh5Ty Print #1, "GRID " & nx & " " & ny qR.Q,(b| Print #1, "1e+308" X]=t> Print #1, pixelx & " " & pixely !k%#R4*> Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 s{++w5s m|# y
>4 maxRow = nx - 1 ]_Xlq_[/r maxCol = ny - 1 )[ ,A_3E For rowNum = 0 To maxRow ' begin loop over rows (constant X) 0V]s:S row = "" "b[5]Y{
U For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) mmsPLv6 row = row & irrad(colNum,rowNum) & " " ' append column data to row string l2d{ 73h Next colNum ' end loop over columns AGno6g f::Dx1VcX Print #1, row ,Q,^3*HX9} *I'yH8Fcn Next rowNum ' end loop over rows E4!Fupkpf Close #1 Al'3? P2!C|SLK Print "File written: " & fullfilepath ~
1 pr~ Print "All done!!" yVc(`,tZ( End Sub t5zKW _J7 +V+a4lU14 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: bcR_E5x$ Je@v8{][| P4?glh q# 找到Tools工具,点击Open plot files in 3D chart并找到该文件 }Lv;! vy/-wP|1 &~!Wym 打开后,选择二维平面图: _U0f=m /bEAK-
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