-
UID:317649
-
- 注册时间2020-06-19
- 最后登录2025-04-02
- 在线时间1761小时
-
-
访问TA的空间加好友用道具
|
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。 cq-e
c7 %?U"[F1 成像示意图 ajf_)G5X P 首先我们建立十字元件命名为Target -Pv P 3 (Gygq# 创建方法: o}5'v^"6, NdaVT5RB 面1 : h #$_<U 面型:plane [YL sEo= 材料:Air 5%vP~vy_} 孔径:X=1.5, Y=6,Z=0.075,形状选择Box <FMuWHY Zw3hp,P] NB~*sP-l& 辅助数据: 0j-F6a*p'1 首先在第一行输入temperature :300K, W$x K^} emissivity:0.1; /3xFd)|Ds C.B8 J"T- 3|z;K,`Fw 面2 : ?STI8AdO
面型:plane ur,V>J<5A 材料:Air X.r!q1_c 孔径:X=1.5, Y=6,Z=0.075,形状选择Box uWM4O@Qn)d :$) aMEq 4cv|ok8P 位置坐标:绕Z轴旋转90度, Au\=ypK (RI>aDGRH 0^|$cvYiL 辅助数据: 1bFEx_ )aO!cQ{s 首先在第一行输入temperature :300K,emissivity: 0.1; Z:}2F^6 )2*|WHO PdE)m/ Target 元件距离坐标原点-161mm; 9h)P8B.>M !*$'fn'bAA T!O3( 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 +eVpMD(
l ~>wq;T:= K;(|v3g6 探测器参数设定: ^AC+nko* !{|yAt9kP 在菜单栏中选择Create/Element Primitive /plane :EmMia-)J !IrKou)/_ 8~XI7g'5x WLA_YMlA 62KW
HB9S #v]aT
]} 元件半径为20mm*20,mm,距离坐标原点200mm。 -a#AE|` 5la]l 光源创建: ?R~Ye 7H@Cy}a 光源类型选择为任意平面,光源半角设定为15度。 aABE= 9Y 5;uX"zG W,eKQV<j 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。 4~J1pcBno% Kps
GQM 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。 >w2WyYJYH X2mm'JDwK )^a#Xn3z 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。 4)S?Y"Bs zAdVJ58H 创建分析面: {?M*ZRO' Gt*<? rG'k<X~7 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。 6je%LHhL C=f(NpyD6 v-]-wNqT 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。 1OGv+b)
i:
uA&9 FRED在探测器上穿过多个像素点迭代来创建热图 LfSUY z Clm'X/ 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。 PX{~! j%n 将如下的代码放置在树形文件夹 Embedded Scripts, =-&iF [ESQD5& u>Kvub 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。 B=xZkc 4o8HEq! 绿色字体为说明文字, 8o!^ZOmU< |?Uc:VFF '#Language "WWB-COM" @Bwl)G!| 'script for calculating thermal image map {.)~4.LhQM 'edited rnp 4 november 2005 `SbX`a0p2 87*[o 'declarations YLd%"H $n Dim op As T_OPERATION +Rd{ ?)2~ Dim trm As T_TRIMVOLUME q.tL' Dim irrad(32,32) As Double 'make consistent with sampling 7!r`DZ"yF Dim temp As Double aM1JG$+7 G Dim emiss As Double FCAu%lvZT Dim fname As String, fullfilepath As String eW<hC( '0?E|B]Cp% 'Option Explicit 'hWRwP| 2}#PDhn Sub Main $dUN+9 'USER INPUTS Y'R1\Go- nx = 31 ~+ur*3X ny = 31 f>PU# D@B numRays = 1000 P;[mw( minWave = 7 'microns );LwWKa maxWave = 11 'microns \`x'g)z(i sigma = 5.67e-14 'watts/mm^2/deg k^4 r}bKVne fname = "teapotimage.dat" MQu6Tm H lvffQ_t Print "" 4'*K\Ul).H Print "THERMAL IMAGE CALCULATION" wtyu"=
djM=QafB:C detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 [?2mt`g 0:p#%Nvg Print "found detector array at node " & detnode G}*B`m QJ?!_2Ax srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ;C%EF `$HO`d@0*R Print "found differential detector area at node " & srcnode ~Otf
" < bHM
.&4G
GetTrimVolume detnode, trm hW&UG#PY> detx = trm.xSemiApe Yn/-m
Z dety = trm.ySemiApe ,5,4 Qf7 area = 4 * detx * dety V"XN(Fd^ Print "detector array semiaperture dimensions are " & detx & " by " & dety O&uOm:/( Print "sampling is " & nx & " by " & ny 25r=Xv lVHJ}(<'p 'reset differential detector area dimensions to be consistent with sampling l(W3|W#P pixelx = 2 * detx / nx fz*6 B NJ pixely = 2 * dety / ny &V$R@~x SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False S6
*dp68 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 \kx9V|A' n>'}tT)U 'reset the source power v*pVcBY> SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) (;N_lF0 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" jiat5 (iFhn*/
E 'zero out irradiance array /+iaw~={" For i = 0 To ny - 1 'JydaF~> For j = 0 To nx - 1 ;%} irrad(i,j) = 0.0 (Jm_2CN7X Next j qXW5_iX Next i P&K~wP] (+@H !>r$$ 'main loop &^Io\ EnableTextPrinting( False ) ty ~U~ $d'Gh2IGA ypos = dety + pixely / 2 |<E%hf For i = 0 To ny - 1 KM6r}CDHs xpos = -detx - pixelx / 2 ev>: 3_ s ypos = ypos - pixely 0R.@\?bhL 8p5u1 ;2 EnableTextPrinting( True ) i<l)To - Print i P_9O8"W EnableTextPrinting( False ) 2axH8ONMu /<@oUv _z_uz\#, For j = 0 To nx - 1 {_ocW@@ 1\1o65en xpos = xpos + pixelx Kh27[@s RxqXGM`4 'shift source #/n\C LockOperationUpdates srcnode, True SQ@@79A GetOperation srcnode, 1, op T^"d%au op.val1 = xpos !=ZbBUJF op.val2 = ypos JV@>dK8 SetOperation srcnode, 1, op >8ePx,+! LockOperationUpdates srcnode, False uvT]MgT P", 53R+" 'raytrace UlyX$f%2 DeleteRays xD1w#FMlQs CreateSource srcnode -E.EI@" TraceExisting 'draw 0%vXPlfnY TN&1C8xr 'radiometry tvI~?\Ylj For k = 0 To GetEntityCount()-1 B;^7Yu0, If IsSurface( k ) Then zc(-dMlK temp = AuxDataGetData( k, "temperature" ) >zXw4=J emiss = AuxDataGetData( k, "emissivity" ) 1h|JKu0 If ( temp <> 0 And emiss <> 0 ) Then ;gf^;%FK ProjSolidAngleByPi = GetSurfIncidentPower( k ) Uc\\..Cf frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ceAK;v
o irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi V+_L9 End If jh9^5"vQ 6Vi #O^> End If <vOljo \S3C"P%w Next k ]x! vPIyq LDO@$jg Next j [K,&s8N5 qd"*Td Next i WC0@g5;1[ EnableTextPrinting( True ) I
91`~0L* {}[S,L 'write out file Rax}r fullfilepath = CurDir() & "\" & fname Q lql(* Open fullfilepath For Output As #1 uG~%/7Qt{ Print #1, "GRID " & nx & " " & ny gtJUQu p2 Print #1, "1e+308" Ggsfr;m\` Print #1, pixelx & " " & pixely ="z\ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 9-I;' VWaI!bK maxRow = nx - 1 '
w!o!_T6 maxCol = ny - 1 P.=&:ay7? For rowNum = 0 To maxRow ' begin loop over rows (constant X) esWgYAc3{ row = "" gs7H9%j{U For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ts
aD5B row = row & irrad(colNum,rowNum) & " " ' append column data to row string 2>_6b>9] Next colNum ' end loop over columns $*{PUj x?VX,9;j Print #1, row A !x"* Gmf.lHr$% Next rowNum ' end loop over rows H'P1EZtq Close #1 TY],H= ==l p\ Print "File written: " & fullfilepath i\XOk! Print "All done!!" l%oie1g l End Sub 1.4]T, ` JnlM0jc]` 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: g~S>_~WL TwqyQ49 m1heU3BUWU 找到Tools工具,点击Open plot files in 3D chart并找到该文件 S`)KC- @(,k%84z ?kI-o0@O. 打开后,选择二维平面图: N4}j,{# wm}6$ n?Za
|