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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。 FC/m,D50oI >jRz4% 成像示意图 xG\&QE 首先我们建立十字元件命名为Target asmMl9)(` _~| j~QE] 创建方法: TZ ?va@2 ,]42v? 面1 : D8C@x` 面型:plane N1zB;-0t 材料:Air HG5|h[4Gt 孔径:X=1.5, Y=6,Z=0.075,形状选择Box K/
I3r_ <s)+V6\E M
E4MZt:> 辅助数据: Cd"O'<^Sb 首先在第一行输入temperature :300K, l7
j3;Ly emissivity:0.1; _{TGO
jZr rhHX0+ q --NLm@; 面2 : 2.Th29] 面型:plane srw5&s(3X 材料:Air 7Ha
+@ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box |9{l8`9}_ Xu3o,k vZq7U]RW 位置坐标:绕Z轴旋转90度, CJ%bBL'. 71mdU6Kq cRDjpc] 辅助数据: p&_Kb\}U S%R:GZEf_ 首先在第一行输入temperature :300K,emissivity: 0.1; LK)0g 4{ `LEk/b1(P .3Jggp Target 元件距离坐标原点-161mm; i:ZpAo+Z{ i$?i1z*c} yOxJx7uD 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 O\q|b#q}/ V+W,#5 X0*
y8" 探测器参数设定: e(@ YBQ/Z XuVbi=pN.2 在菜单栏中选择Create/Element Primitive /plane bT@3fuL4 EXK~Zf|&Z Ha)eeE$ (B.J8`h } q UY;CEf V)^nVD)e 元件半径为20mm*20,mm,距离坐标原点200mm。 oQBfDD0 P`v%<
9~ 光源创建: GE\@mu *pO 5lu620o 光源类型选择为任意平面,光源半角设定为15度。 fpwge/w l
Ztq_* Fl AA:Ch? 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。 ^PMP2\JQA N5Eb.a9S 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。 WFocA: U{"&Jj Q|rrbx 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。 H5j~<@STC rQC{"hS1 创建分析面: hub1rY|No ]d&6 ?7 !> 4Cr|]o' 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。 MoIVval/ Y .Na9&-( U<|kA(5 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。 B8NOPbT yk5-@qo FRED在探测器上穿过多个像素点迭代来创建热图 iqig~fjK~ sa36=:5x- 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。 <v&>&;>3 将如下的代码放置在树形文件夹 Embedded Scripts, 0.4c|-n RcitW;{|Kg lwIU|T<4 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。 [~,~ e
|d?0ZA:z 绿色字体为说明文字, 8
C @iD% CS"2Sd 1` '#Language "WWB-COM" HA&][%^ 'script for calculating thermal image map ymT&[+V 'edited rnp 4 november 2005 a]|P rjPI C s?kZ
% 'declarations @5K/z<p% Dim op As T_OPERATION js/N qf2> Dim trm As T_TRIMVOLUME Q7zg i Dim irrad(32,32) As Double 'make consistent with sampling j
yR9a! Dim temp As Double W]{mEB Dim emiss As Double Gt{~u^< Dim fname As String, fullfilepath As String @jAuSBy *aT3L#0( 'Option Explicit N>giFj[dD 1Rc'2Y Sub Main %Ak"d+OH4 'USER INPUTS r 'wam]1Z nx = 31 N'w;1,c+ ny = 31 r%A- numRays = 1000 4<CHwIRHY minWave = 7 'microns ~]a:9Ev* maxWave = 11 'microns ,d'x]&a sigma = 5.67e-14 'watts/mm^2/deg k^4 48nZ
H=(Eh fname = "teapotimage.dat" P#-Ye<V~J( H]K(`)y}4 Print "" `6koQZm Print "THERMAL IMAGE CALCULATION" Z%Q[W}iD 6 6WAD$8$ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 IFYGl A I}29L3C Print "found detector array at node " & detnode */fmy|#
&$ZJfHD@ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 9ar+P h@* gf7%vyMo$ Print "found differential detector area at node " & srcnode ?a+>%uWt 9E~=/Q= GetTrimVolume detnode, trm FWcE\;%yVg detx = trm.xSemiApe 6a51bj!f dety = trm.ySemiApe cl:h'aG area = 4 * detx * dety }w^Hm3Y^& Print "detector array semiaperture dimensions are " & detx & " by " & dety p3>p1tC Print "sampling is " & nx & " by " & ny s ki'I -\xNuU 'reset differential detector area dimensions to be consistent with sampling wGD*25M7$ pixelx = 2 * detx / nx E9JxntX pixely = 2 * dety / ny *f{\ze@5= SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False bim}{wMb Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ~{lSc/SP| IIcG+zwx 'reset the source power :23w[vt= SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) -,+zA.{+W Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" hF|N81T da<B6! 'zero out irradiance array _{0'3tI7 For i = 0 To ny - 1 706-QE^ For j = 0 To nx - 1 mDZ/Kp{ irrad(i,j) = 0.0 5'>DvCp%M Next j FY1
>{Bn Next i AlF"1X02 BnJpC<xm 'main loop 1h_TG.YL9> EnableTextPrinting( False ) (Ubz@s^ yh~*Kt]9Ya ypos = dety + pixely / 2 L|O[u^ For i = 0 To ny - 1 VrDSN xpos = -detx - pixelx / 2 KCEBJ{jM ypos = ypos - pixely 2H+!78 eW%Cef EnableTextPrinting( True ) i [,9hp Print i jNRR=0 EnableTextPrinting( False ) H&0dc.n~. |hHj7X<?k U4`6S43ki For j = 0 To nx - 1 jD]Ci#|W R]L$Ld< ij xpos = xpos + pixelx YQ/ mk*r^k`a 'shift source NL`}rj LockOperationUpdates srcnode, True G':wJ7[]` GetOperation srcnode, 1, op #yPQt! op.val1 = xpos Ed">$S op.val2 = ypos 'YKyY:eZ SetOperation srcnode, 1, op V
,#
|\ LockOperationUpdates srcnode, False =zaf{0c /qf(5Bm raytrace \piB*"ln DeleteRays 3(?V!y{@ CreateSource srcnode +r8:t5:/I TraceExisting 'draw Y
1v9sMN, `X;' *E]e 'radiometry #GoZH?MAF For k = 0 To GetEntityCount()-1 yE+Wb[H[ If IsSurface( k ) Then 5pC+*n. temp = AuxDataGetData( k, "temperature" ) @-B)a Z emiss = AuxDataGetData( k, "emissivity" ) o;w5;TkY If ( temp <> 0 And emiss <> 0 ) Then 6b!F7kyg ProjSolidAngleByPi = GetSurfIncidentPower( k ) 8s+9PE frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ,hO*W-a%1 irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ^~dBO%M^ End If F"|OcKAA}h b({K6#?'[ End If ohLM9mc9 R_JB`HFy= Next k $G UCVxs 2lb HUK Next j Vv|%;5( oh^/)2W Next i GvB;o^Wd EnableTextPrinting( True ) x`3F?[#l /-FvC^Fj 'write out file =qWcw7!" fullfilepath = CurDir() & "\" & fname 0R21"]L_M Open fullfilepath For Output As #1 H^TU?vz}
< Print #1, "GRID " & nx & " " & ny W%&gvZre. Print #1, "1e+308" p+.xye U( Print #1, pixelx & " " & pixely r(qwzUI Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 qpt},yn)C ;xXD2{q maxRow = nx - 1 dp|VQWCq maxCol = ny - 1 Z=KHsMnB For rowNum = 0 To maxRow ' begin loop over rows (constant X) :abpht row = "" `<#Ufi*c For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) A
)q=.C#e row = row & irrad(colNum,rowNum) & " " ' append column data to row string qpEK36Js Next colNum ' end loop over columns z JBcz, G~ONHXL Print #1, row Vb57B.I )i^+=TZ q Next rowNum ' end loop over rows YqQAogyh Close #1 N9S?c Zws[C Print "File written: " & fullfilepath hJc^NU5 Print "All done!!" cVYPPal End Sub SuJa?VU1w S%6 V(L| 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: \D5_g8m:
?PSJQ3BC| #qcF2&a% 找到Tools工具,点击Open plot files in 3D chart并找到该文件 6uu49x_^L4 s
+Q'\? 3vc2t6S%* 打开后,选择二维平面图: G<m6Sf o4qB0h
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