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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||M
| ^oj)#(3C 成像示意图 XjWoUnz 首先我们建立十字元件命名为Target 0,,x|g$TpT s fazrz`h 创建方法: >0{{loqq ze]2-B4 面1 : =d`,W9D 面型:plane dqnxhN+& 材料:Air ,xNuc$8Jd 孔径:X=1.5, Y=6,Z=0.075,形状选择Box &c0U\G|j :v=Yo )
=sm{R%T 辅助数据:
|G{TA 首先在第一行输入temperature :300K, *l^h;RSx emissivity:0.1; ?> }bg R9~%ORI#; _a^%V9t 面2 : nRJcYl~
Y 面型:plane nJlrBf_Kj 材料:Air In5'(UHW: 孔径:X=1.5, Y=6,Z=0.075,形状选择Box GRS[r@W[1 jCxw|tmgq Ar N *9 位置坐标:绕Z轴旋转90度, K)N7Y=C3 | x/, 9PIm/10pP^ 辅助数据: A2!7a}*1( @u#Tx% 首先在第一行输入temperature :300K,emissivity: 0.1; Pqi>,c<&mL L@XhgQ _m#M^<0n Target 元件距离坐标原点-161mm; x<4-Q6'{S C|8.$s< G ,An8GR%& 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 !0{":4\ w-pdpbHV QD-#sU]
探测器参数设定: x/ lW=EQ @;!s"!~sv 在菜单栏中选择Create/Element Primitive /plane 7'k+/rAO lZ'-?xo E80C0Q+V _0<qS{RW G$<FQDvs $_%yr
~2 元件半径为20mm*20,mm,距离坐标原点200mm。 LSS3(l[,: Zqc+PO3lw 光源创建: Ol"*(ea-TX 8xW_N"P.> 光源类型选择为任意平面,光源半角设定为15度。 |9$K'+' ;Z\jX[H -L}crQl.'c 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。 Y1vl,Yi nJ<h}*[ 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。 |t5K!?{i UEbRg =6
T.]+T[}! 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。 VQI Ew~piuj 创建分析面:
s>~ h<B .gh3" pj4M|'F7 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。 I"eXoqh icLf;@ &W)Lzpx8c 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。 :80!-F*\ 3R>U^
Y FRED在探测器上穿过多个像素点迭代来创建热图 x>TH yY[sq 481J=8H 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。 f^\qDvPur 将如下的代码放置在树形文件夹 Embedded Scripts, ~ x-
R78' t`1E4$Bb\ #0V$KC*> 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。 (P&~PJH ^kA^>vi 绿色字体为说明文字, {p@u H<) ~vgm;O '#Language "WWB-COM" 8(J&_7u 'script for calculating thermal image map
*(5y;1KU 'edited rnp 4 november 2005 U`Bw2Vdk]S \WKly 'declarations x2/L`q"M?= Dim op As T_OPERATION OLp;eb1g Dim trm As T_TRIMVOLUME xO"fg9a Dim irrad(32,32) As Double 'make consistent with sampling 5RD\XgyN] Dim temp As Double #
Un>g4>Rh Dim emiss As Double tp"dho Dim fname As String, fullfilepath As String Ad !=
*n *Y(v!x \L 'Option Explicit IMjz#|c Vf<VKP[9K Sub Main 1ga.%M* 'USER INPUTS .4P5tIn\ nx = 31 ^|-*amh ny = 31 -?{bCq numRays = 1000 =>Ss:SGjT minWave = 7 'microns t-7^deG'/n maxWave = 11 'microns WxwSb`U| sigma = 5.67e-14 'watts/mm^2/deg k^4 %6r MS} fname = "teapotimage.dat" IO3`/R- FaS}$-0 Print "" ClZ:#uMbN Print "THERMAL IMAGE CALCULATION" v%N/mL+5L `D)ay detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 itV@U CZaUrr Print "found detector array at node " & detnode (s`oJLW> ;o*n*N srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 MR:GH.uM: WrWJ!
Print "found differential detector area at node " & srcnode n-iy;L^b >b9nc\~ GetTrimVolume detnode, trm !}%,rtI detx = trm.xSemiApe =d07c dety = trm.ySemiApe GiI|6z! area = 4 * detx * dety #lDf8G|ST~ Print "detector array semiaperture dimensions are " & detx & " by " & dety 7u8HcHl Print "sampling is " & nx & " by " & ny "o.V`Bj 8/ lv, m# 'reset differential detector area dimensions to be consistent with sampling 9gFb=&1k pixelx = 2 * detx / nx F-K=Otj pixely = 2 * dety / ny :6R0=oz SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 2ZHeOKJ- Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ia=eFWt. OT-!n 'reset the source power Np$peT[ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) l"9.zPvT< Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" FnkB
z5D 0a<:.} 'zero out irradiance array w
D|p'N For i = 0 To ny - 1 x\HHu] For j = 0 To nx - 1 }<?1\k irrad(i,j) = 0.0 MZ" yjQ A Next j (pY'v/ a- Next i F<SCW+>z2a 8I=n9Uyz 'main loop Ph[P$: 9 EnableTextPrinting( False ) <?|v-(E }*vUOQQp* ypos = dety + pixely / 2 88c-K{}3 For i = 0 To ny - 1 o5~o Rmsr xpos = -detx - pixelx / 2 Vq[L4 ypos = ypos - pixely :|%dV}j k&Z3v. EnableTextPrinting( True ) p4},xQzB Print i N6CWEIJ EnableTextPrinting( False ) G55-{y9Q ( `V dOm`p W ^ For j = 0 To nx - 1 ?,Z[)5 ZN ;qM
I3 wF xpos = xpos + pixelx B^4D`0G[4 kz4d"bTb 'shift source ]7H ? LockOperationUpdates srcnode, True L`"PaIMz GetOperation srcnode, 1, op u$T`Bn op.val1 = xpos bcgh}D op.val2 = ypos CH
|A^!Zm SetOperation srcnode, 1, op z}XmRc_Ko LockOperationUpdates srcnode, False X6_m&~}15 %<^B\|d'? 'raytrace <sXmk{ DeleteRays 8J60+2Wa CreateSource srcnode -w8c;5X TraceExisting 'draw i21ybXA=Z K@ZK@++ 'radiometry &zVF!xNy& For k = 0 To GetEntityCount()-1 (e>.hfrs If IsSurface( k ) Then rL+K Sb temp = AuxDataGetData( k, "temperature" ) }(}+I}&~ emiss = AuxDataGetData( k, "emissivity" ) x,kZ>^]&b If ( temp <> 0 And emiss <> 0 ) Then {+Rf?'JZH ProjSolidAngleByPi = GetSurfIncidentPower( k ) Rg/*)SKj frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ,,*i!%Adw irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 5k&tRg End If lWYZAF>?Ym lZpa)1.tiC End If ?NazfK 5)=XzO0 Next k Vf
Jpiv1 P\"|b\O1 Next j 3Q-i%7l hdFIriE3 Next i wd4wYk\ EnableTextPrinting( True ) WM8
Ce0E vfW 'write out file Vq)6+n8o fullfilepath = CurDir() & "\" & fname GWs[a$| Open fullfilepath For Output As #1 -49z.(@ki Print #1, "GRID " & nx & " " & ny L\@SX?j Print #1, "1e+308" q%HT)^F9oO Print #1, pixelx & " " & pixely < 8yv( Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 zbL!q_wO !ueyVE$1 maxRow = nx - 1 d',OQ,~{ maxCol = ny - 1 !L3M\Q0 For rowNum = 0 To maxRow ' begin loop over rows (constant X) &_Py{Cv@Dw row = "" Nr.maucny For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) '\[o>n2 row = row & irrad(colNum,rowNum) & " " ' append column data to row string 2{t i])
Next colNum ' end loop over columns <|= UrG 7%aaqQ1T Print #1, row sP1wO4M?{ [<~1.L^I Next rowNum ' end loop over rows d
]LF5*i Close #1 ,3^gB,ka Vc!` BiH Print "File written: " & fullfilepath !2dA8b Print "All done!!" ,Lt+*!;m End Sub \k?uh+xl g(d9=xq@k 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: e/@t U'$ xFZA18 >YPC&@9
找到Tools工具,点击Open plot files in 3D chart并找到该文件 hdB.u^! 8nOMyNpy~M =
;sEi:HC 打开后,选择二维平面图: ["|' f =3rPE"@,[
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