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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。 3iIURSG@ PX- PVW 成像示意图 cC*H.N 首先我们建立十字元件命名为Target 7>V*gV?v H?_wsh4J 创建方法: i+Lqj Xqy9D ZIn 面1 : gX|We}H 面型:plane Y 8n*o3jM 材料:Air $(]E$ek 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 5{xK&[wR* y 2C Jk~ hLr\;Swyp 辅助数据: sOO_J!bblP 首先在第一行输入temperature :300K, {O6yJckH emissivity:0.1; Ys0N+ K|Xr~\= OWc~=Cr 面2 : [Y4Wm? 面型:plane ?="?)t[ 材料:Air W)<t7q+ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box (h|E@gRa [(2XL"4D @\WeI"^F8 位置坐标:绕Z轴旋转90度, 9$L2a BS=~G+/:| K: |-s4= 辅助数据: Gl%N}8Cim d2?#&d'aq 首先在第一行输入temperature :300K,emissivity: 0.1; bao"iv~z z?@N+||,. F_Gc_eT Target 元件距离坐标原点-161mm; qP$)V3l '5(T0Ws/w ^fQa whub 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ^'n;W<\p) %NDr5E^cc IgN^~ag` 探测器参数设定: =6
3tp 9 &x\cEI)! 在菜单栏中选择Create/Element Primitive /plane )nGH$Mu YkbuyUui 26;Gt8 nkzH}F=< '6cXCO-_P 6!se,SCvw 元件半径为20mm*20,mm,距离坐标原点200mm。 X}wo$t \
B'AXv6 光源创建: RT(ejkLZm m8V}E&6 光源类型选择为任意平面,光源半角设定为15度。 |\>Ifv%{ 4Y{;%;-i dQz#&&s-
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。 IL1iTRH LLKYc y 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。 _'4S1 K
$WMrp (I#mo2 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。 *I[tIO\ G+2 ,x0( 创建分析面: ROXa/ ?E<9H/ ^wD`sj<Qg 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。 Z6-ZAS(>m 0gGr/78
Ss0I{0 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。 5,4m_fBoW
CvR-lKV< FRED在探测器上穿过多个像素点迭代来创建热图 }KO <II ,"F0#5 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。 w IP4Z^ 将如下的代码放置在树形文件夹 Embedded Scripts, {5fL!`6w DN iH" 0% D &@Iuo 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。 mlPvF%Ba zkiwFEHA= 绿色字体为说明文字, Abi(1nXdQ _''un3eCY '#Language "WWB-COM" "LSzF_mK 'script for calculating thermal image map =ZO lE|4 'edited rnp 4 november 2005 ~ivOSr7s} CB
X}_]9X 'declarations vt nT Dim op As T_OPERATION o@7U4#E Dim trm As T_TRIMVOLUME 0OQ*V~>f Dim irrad(32,32) As Double 'make consistent with sampling n @,. Dim temp As Double dWY{x47 Dim emiss As Double 3Fxr= Dim fname As String, fullfilepath As String u:f.;? $7ix(WL<% 'Option Explicit }'fa f{W nt+OaXe5D Sub Main i(OeE"YA 'USER INPUTS oam;hmw nx = 31 qGX#(,E9; ny = 31 $PI9vyS numRays = 1000 2gZ nrU minWave = 7 'microns gWoUE7.3` maxWave = 11 'microns OScqf]H sigma = 5.67e-14 'watts/mm^2/deg k^4 .ANR|G fname = "teapotimage.dat" !%D';wQ,/ "<{|ni} Print "" rmo\UCD Print "THERMAL IMAGE CALCULATION" 15q^&l[Q jd,i=P% detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 ZHa>8x;Mjl Wy*+8~@A Print "found detector array at node " & detnode |
oK9o6m4 ,lStT+A srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ><Zu+HX uo J0wG. Print "found differential detector area at node " & srcnode k].swvIi aidQ,(PDj GetTrimVolume detnode, trm wpN3-D detx = trm.xSemiApe RRB=JP{r dety = trm.ySemiApe 1^2Q`~,g area = 4 * detx * dety lgS7; Print "detector array semiaperture dimensions are " & detx & " by " & dety i>]PW|]
Print "sampling is " & nx & " by " & ny * Ogf6 gBi3^GxjM? 'reset differential detector area dimensions to be consistent with sampling mJ=V<_ pixelx = 2 * detx / nx HKJBR)T pixely = 2 * dety / ny y`j=(|DV SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False -4sKB>b Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 rhy-o? DU$#tg}{ 'reset the source power $Seh4 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) -{k8^o7$ Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" JO0o@M5H TH'8^w f 'zero out irradiance array bT&{8a For i = 0 To ny - 1 Q}OloA(+ For j = 0 To nx - 1 .=TXi<8Brw irrad(i,j) = 0.0 BZHoRd{EH Next j \U]K!K= Next i @$n
$f kx?Yin8K 'main loop kj[boxN EnableTextPrinting( False ) 0bM_EC iiMS3ueF ypos = dety + pixely / 2 ^@O7d1&y For i = 0 To ny - 1 {yWL|:#K xpos = -detx - pixelx / 2 G^#>HE| ypos = ypos - pixely HXSryjF? hN6wp_ EnableTextPrinting( True ) l^nvwm`f#: Print i #gO[di0WhC EnableTextPrinting( False ) k|?[EWIi^ T+&fUhSy m2jts(stp For j = 0 To nx - 1 a-Y6ghs U364'O8_ xpos = xpos + pixelx xZ P
SUEG J(d[05x0 'shift source }7 +%k/ LockOperationUpdates srcnode, True r8:"\%"f> GetOperation srcnode, 1, op 1Ub=RyB op.val1 = xpos aH?Ygzw op.val2 = ypos qi7C.w; SetOperation srcnode, 1, op '(3 QyCD LockOperationUpdates srcnode, False eG!ma` v } SWp~3P 'raytrace 452kE@=49 DeleteRays r^}0qO,XM CreateSource srcnode %p )"_q!ge TraceExisting 'draw H
Eq{TUTr j67ppt 'radiometry p03I&d@w> For k = 0 To GetEntityCount()-1 = NZgbl If IsSurface( k ) Then V&:x+swt temp = AuxDataGetData( k, "temperature" ) te-xhJ&K emiss = AuxDataGetData( k, "emissivity" ) MWA,3I\. If ( temp <> 0 And emiss <> 0 ) Then %K|f,w=m ProjSolidAngleByPi = GetSurfIncidentPower( k ) 3`%E;?2 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) /\- }-"dm irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ajk}&`Wj" End If h>D;QY n'V{ End If Slg*[r# JS^DyBXc Next k <hCO-r# ?[zw5fUDS Next j *{#C;" Y?J/KW3 Next i GJcxqgk$ EnableTextPrinting( True ) 1m"WrTen rIcgf1v70 'write out file T^|k` fullfilepath = CurDir() & "\" & fname eZ(ThA*2=t Open fullfilepath For Output As #1 Dh2Cj-|
~ Print #1, "GRID " & nx & " " & ny .(q'7Q Z/ Print #1, "1e+308" (Q=o9o:b Print #1, pixelx & " " & pixely FNH)wk Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 iZy>V$Aq 8bdO-LJ9 maxRow = nx - 1 Jk>vn+q8P^ maxCol = ny - 1 5s3QN{h8 For rowNum = 0 To maxRow ' begin loop over rows (constant X) _-y1>{]H row = "" 2H.g!( Oza For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) Q&r.wV| row = row & irrad(colNum,rowNum) & " " ' append column data to row string ]-X6Cl Next colNum ' end loop over columns D
tZ?sG gjG SI'M0B Print #1, row GxD`M2 KF+r25uy[+ Next rowNum ' end loop over rows WyatHC Close #1 %50)?J=zB r+C4<-dT Print "File written: " & fullfilepath XyN
" Jr Print "All done!!" 7ihcjyXB End Sub 3JQ7Cc> @ !su7 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: Wjl2S+Cc 9!X3Cv|+L H%Gz" 找到Tools工具,点击Open plot files in 3D chart并找到该文件 G$TO'Ciu: Z[*unIk p2 1| 打开后,选择二维平面图: ugTsI~aE 8]`#ax
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