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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。 ZoSyc--Bv Cl-P6NlR". 成像示意图 'Cz*p, 首先我们建立十字元件命名为Target F&m9G >r }f14# y; 创建方法: dUt4]
ar x[&<e<6 面1 : 4>LaA7)v 面型:plane U zc p 材料:Air 1q3"qYH 孔径:X=1.5, Y=6,Z=0.075,形状选择Box zy nX9t hayJgkZ' tHHJ|4C 辅助数据: 8iOHav4 首先在第一行输入temperature :300K, '`.-75T emissivity:0.1; hliO/3g $eG_LY 1v H{,1-&>| 面2 : l|E4 7@# 面型:plane FI.F6d)E$ 材料:Air ~ {yy{ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box @ =~k[o NN1}P'6Ha J:gC1g^ 位置坐标:绕Z轴旋转90度, N6\rjYx+7 h6^|f%\w*i 1"75+Q>D 辅助数据: e&U$;sS` Wf"GA i 首先在第一行输入temperature :300K,emissivity: 0.1; _$5DK%M} OFyy!r@? "~._G5i. Target 元件距离坐标原点-161mm; )lJAMZ 5xp ~<9e}J z rG 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 1'Q6l KYJP`va6k =_z o 探测器参数设定: 2IRARZ,3 qHdUnW 在菜单栏中选择Create/Element Primitive /plane k'H[aYMA {FKr^)g #$-?[c$> : [328X2 u_
l?d j~K(xf 元件半径为20mm*20,mm,距离坐标原点200mm。 :Dw_$ s(5hFuyg 光源创建: C$~ly=@ =xRD
%Z 光源类型选择为任意平面,光源半角设定为15度。 CJ%'VijhD 0F%8d@Y2 rTR"\u7&H 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。 1/w8'Kf'u M9BEG6E9 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。 {d;z3AB w9VwZow ^Cp2#d* 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。 0#eb] c jS[=Zx` 创建分析面: fuv{2[NV Q2r[^Z Fj~suZ` 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。 '@hUmrl oxN5:) P(b[|QF 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。 d94k dhLR#m30T FRED在探测器上穿过多个像素点迭代来创建热图 uGb+ *tD O!f37n-TB 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。 }EkL[H! 将如下的代码放置在树形文件夹 Embedded Scripts, 'G>XI;g M.}J SDt .\ fpjQW 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。 Y* rujn{ i]?
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U\:Y*Ai '#Language "WWB-COM" 7:pc%Ksq 'script for calculating thermal image map IJ2' 'edited rnp 4 november 2005 @XM*N7 y-nv#Ejr 'declarations wzju)q S Dim op As T_OPERATION 6P717[ Dim trm As T_TRIMVOLUME YCltS!k Dim irrad(32,32) As Double 'make consistent with sampling )AkBo Dim temp As Double n:/!{. Dim emiss As Double
d9k` Dim fname As String, fullfilepath As String X5/fy"g& dt"/4wCO 'Option Explicit 9]l I?j]o axvZA:l Sub Main Y`]P&y 'USER INPUTS JFX}))7 nx = 31 c(
U,FUS ny = 31 `b8nz 7 numRays = 1000 Y0|){&PCt minWave = 7 'microns WXmfh maxWave = 11 'microns Vlz\n sigma = 5.67e-14 'watts/mm^2/deg k^4 .G\](% fname = "teapotimage.dat" a'jUM+D; nfHjIYid Print "" DoQ^caa@ Print "THERMAL IMAGE CALCULATION" sYDav)L. 3c6e$/ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 n5UUoBv ,:L^vG@* Print "found detector array at node " & detnode AP,ZMpw Cfmd*, srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 Uvm.|p_V L5`k3ap| Print "found differential detector area at node " & srcnode >JE+g[$@ N ~=PecQ GetTrimVolume detnode, trm gdTW
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detx = trm.xSemiApe V;MmPNP| dety = trm.ySemiApe E-C]<{`O area = 4 * detx * dety a5t&{ajJ Print "detector array semiaperture dimensions are " & detx & " by " & dety |X:`o;Uma Print "sampling is " & nx & " by " & ny zX*5yNd v LN KX;9 'reset differential detector area dimensions to be consistent with sampling z*jaA;# pixelx = 2 * detx / nx OeASB} pixely = 2 * dety / ny fiWN^sTM SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False U&])ow): Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 (c)/&~aE Ds"%= 'reset the source power K1J |\!o SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) p
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` Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" bLG7{qp tT)s,R% 'zero out irradiance array 3GE;:;8B For i = 0 To ny - 1 kEC^_sO" For j = 0 To nx - 1 pp(09y`] irrad(i,j) = 0.0 p1d%&e Next j Cscu Next i >qNpY(Ql lmHQ"z 3G 'main loop ~HGSA( EnableTextPrinting( False ) 80lhhqRC h.#:7d(g ypos = dety + pixely / 2 EoPvF`T For i = 0 To ny - 1 R_/;U&R xpos = -detx - pixelx / 2 qy pF}Pw ypos = ypos - pixely M| Gl&
)cizd^{ EnableTextPrinting( True ) AYY(<b Print i ]N]Fb3 EnableTextPrinting( False ) kB CU+FC a_}C*+D PZ6R+n8 For j = 0 To nx - 1 }[z7V "$(D7yFO xpos = xpos + pixelx ^"|q~2 |%5Aku0`s 'shift source Rl cL(HM LockOperationUpdates srcnode, True Axb=1_-- GetOperation srcnode, 1, op NbU4|Oi op.val1 = xpos z{ eZsh
b op.val2 = ypos vd#)+ SetOperation srcnode, 1, op Rq+7&%dy LockOperationUpdates srcnode, False DjK7_'7(L dh6kj-^;Cf raytrace `+< ^Svou DeleteRays ?Ybq]J\q CreateSource srcnode i9Bh<j>:J TraceExisting 'draw R- >~MLeK] ^wZx=kas 'radiometry R[\1Kk(Zo For k = 0 To GetEntityCount()-1 Ng;?hT w If IsSurface( k ) Then jG&HPVr temp = AuxDataGetData( k, "temperature" ) N,XjZ26 emiss = AuxDataGetData( k, "emissivity" ) VOr:G85*s If ( temp <> 0 And emiss <> 0 ) Then 3s%DF, ProjSolidAngleByPi = GetSurfIncidentPower( k ) I$sXbM;z= frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) |X1axRO irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi >%`SXB&9 End If RYvdfj.ij .zdaY,
U End If ~:{ mKc O,
eoO,gB Next k ^#e|^]]
L 6B@e[VtG$ Next j egA*x*8 {06-h %qr Next i ?QFxds EnableTextPrinting( True ) Zl9 j<!dpt 'write out file 1mtYap4
fullfilepath = CurDir() & "\" & fname 7t<h 'g2 Open fullfilepath For Output As #1 $2*_7_Qb Print #1, "GRID " & nx & " " & ny +UOVD:G Print #1, "1e+308" 4=^Ha%l Print #1, pixelx & " " & pixely gzhIOeY Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ]m`:T FsOJmWZ maxRow = nx - 1 i75\<X maxCol = ny - 1 %k?/pRv$> For rowNum = 0 To maxRow ' begin loop over rows (constant X) #E
Bdg row = "" 5V(#nz For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) PJm@fK(j row = row & irrad(colNum,rowNum) & " " ' append column data to row string j<
h1s% Next colNum ' end loop over columns |PYyhY W Pr:d Print #1, row \6 J Y#% q0ab]g+ Next rowNum ' end loop over rows #'f5owk>, Close #1 iu<Tv,{8 4w9=z, Print "File written: " & fullfilepath o@PvA1 Print "All done!!" 4s%zvRu End Sub ]vR
Ol. uAnL` 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: JP"#9f F> Ika=z, k9H}nP$F 找到Tools工具,点击Open plot files in 3D chart并找到该文件 $$p +~X POl-S<QV J3 oUtu 打开后,选择二维平面图: {G3Ok++hc pheu48/f
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