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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。 V-E 77u6{0 ((<\VQ,>( 成像示意图 G}LV"0? 首先我们建立十字元件命名为Target rO YD[+ }%<_>b\ 创建方法: JT~Dr KI_ \ H#" 面1 : _Vf>>tuW 面型:plane vp9wRGd 材料:Air ggm'9| 孔径:X=1.5, Y=6,Z=0.075,形状选择Box l;&kX6 w ) jt?X} kP5G}Bp 辅助数据: cV_-Bcb 首先在第一行输入temperature :300K, x34GRe!! emissivity:0.1; Jr= fc*f ^~6gkS
} rl&.|;5uH; 面2 : atmW? Z 面型:plane z-:>[Sn 材料:Air k*!iUz{] 孔径:X=1.5, Y=6,Z=0.075,形状选择Box P2|+7D: qQ6@43TC jSRi 位置坐标:绕Z轴旋转90度, 5uOz #hN 0\s&;@xKk -M_>]ubG 辅助数据: x9S9%JG : m(^N8k1K; 首先在第一行输入temperature :300K,emissivity: 0.1; g!o2vTt5 euW TCIbPsE Target 元件距离坐标原点-161mm; ;*ULrX4[ K5t.OAA: ]0MuXiR 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 qZ
+K4H 8?x:PkK s&<76kwl 探测器参数设定: $<Y%4LI 3-)}.8F 在菜单栏中选择Create/Element Primitive /plane e&Q
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(>0YMv 元件半径为20mm*20,mm,距离坐标原点200mm。 jW-;Y/S !(viXV5 光源创建: !^v~hD$_q A wk1d 光源类型选择为任意平面,光源半角设定为15度。 t}?-ao Yx,7e(AI` R,=8)OI2 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。 ]VE3u_kR R*XZPzg% 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。 T:9M|mD Uj3HAu K[
S>EITr 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。 0vBQzM Q pG"hZB3) 创建分析面: ;ceg:-Zqo t)g%9 k^ :XPat93w 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。 V@TA~'$| o_[~{@ RoR i~R+g3oi 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。 m\bmBK"I m_BpY9c]5 FRED在探测器上穿过多个像素点迭代来创建热图 jp@X,HES csxn"Dz\ 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。 ,dw\y/dn 将如下的代码放置在树形文件夹 Embedded Scripts, Q~k|lTf Ggsts TXS`ey 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。 ZM<UiN }d iE' 绿色字体为说明文字, 0Zo><= s{V&vRr '#Language "WWB-COM" .;.Zbhm 'script for calculating thermal image map ~Fl\c- 'edited rnp 4 november 2005 ,j\uvi(Y * LWihal 'declarations !?Y71:_! Dim op As T_OPERATION /BvMNKb$$ Dim trm As T_TRIMVOLUME F$kiSjh9aJ Dim irrad(32,32) As Double 'make consistent with sampling 8 ph1xQ' Dim temp As Double :`"-Jf Dim emiss As Double !dcvG9JZ Dim fname As String, fullfilepath As String GK6CnSV8d rg]b$tL~ 'Option Explicit b`^?nD7 riaL[4c Sub Main #N64ZXz_ 'USER INPUTS D!Nc&|X^ nx = 31
QMrH%Y ny = 31 /6yVbo" numRays = 1000 1&7?f minWave = 7 'microns X.,R%>O}`P maxWave = 11 'microns _v,Wl/YAp sigma = 5.67e-14 'watts/mm^2/deg k^4 ,HmGp fname = "teapotimage.dat" px+]/P<dX )`\Q/TMl5 Print "" W_Y56@7e Print "THERMAL IMAGE CALCULATION" EM+! ph 0/fZDQH detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 XpK
Y# wN/v-^2 Print "found detector array at node " & detnode uGW#z_{(n qD=b+\F srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 k]RQ 7e 6cbV[!BL Print "found differential detector area at node " & srcnode TeR bW T?.l_"%%d GetTrimVolume detnode, trm KZ^>_K& detx = trm.xSemiApe EGFPv'De dety = trm.ySemiApe CtD<%v3` area = 4 * detx * dety {Dy,|}7s Print "detector array semiaperture dimensions are " & detx & " by " & dety ;:J"- p Print "sampling is " & nx & " by " & ny ,pf\g[tz QyZ'%T5J 'reset differential detector area dimensions to be consistent with sampling ]*U; } pixelx = 2 * detx / nx T-kHk( pixely = 2 * dety / ny 5xNOIOpDB SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False p?P.BU\CR Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ~Hj c?* JnnxXj30, 'reset the source power l^}5PHLd SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) r~fnK%| Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" O~x{p,s
U w Bm4~~_ 'zero out irradiance array rd[mC[
r For i = 0 To ny - 1 \Ov~ t For j = 0 To nx - 1 7X>@r"9< irrad(i,j) = 0.0 H/8u?OC Next j Ju;^^ Next i Ep')@7^n J\'f5)k 'main loop |gINB3L EnableTextPrinting( False ) #,})N*7 rfSEL
57' ypos = dety + pixely / 2 Tgi7RAY For i = 0 To ny - 1 %.\+j,G7 xpos = -detx - pixelx / 2 u3UN ypos = ypos - pixely K!E\v4 >!o!rs EnableTextPrinting( True ) r4K%dx-t Print i P$^I\aGO EnableTextPrinting( False ) [kgCB7.V ]lE5^<<
;4v`FC> For j = 0 To nx - 1 I\j- 6ZjY-)h xpos = xpos + pixelx A4;~+L :M #Wb4* 'shift source 5,|{|/ LockOperationUpdates srcnode, True ozHL'H GetOperation srcnode, 1, op %6M%PR~u op.val1 = xpos Rx.5;2m op.val2 = ypos k>!i
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SetOperation srcnode, 1, op _ph1( !H$ LockOperationUpdates srcnode, False 3qV\XC+ e-lc2$o7{ raytrace >I&s%4 DeleteRays *Id[6Z CreateSource srcnode [?2?7>D8 TraceExisting 'draw _l,-SQgj EgzdRB\Cf 'radiometry <5ULu(b&$ For k = 0 To GetEntityCount()-1 ;LKYA?=/V If IsSurface( k ) Then F^}d>2W( temp = AuxDataGetData( k, "temperature" ) lC
d\nE8G emiss = AuxDataGetData( k, "emissivity" ) ,&Zk63V If ( temp <> 0 And emiss <> 0 ) Then cN\_1 ProjSolidAngleByPi = GetSurfIncidentPower( k ) 2:yXeSeA frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) [w+1<ou;j irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi O\%0D.HEz End If v`6vc)>8 OsYZa`$, End If 2IkyC` Q(BZg{ Next k 3 "Qg"\ cVmF'g Next j C}9|e?R[Rz N\CHIsVm> Next i *r!qxiY=
r EnableTextPrinting( True ) {q~N$"# $8[JL\ 'write out file r,L`@A=v fullfilepath = CurDir() & "\" & fname Zu2
$$_+L Open fullfilepath For Output As #1 |0_5iFAB| Print #1, "GRID " & nx & " " & ny uY3#, Print #1, "1e+308" '#QZhz(+ Print #1, pixelx & " " & pixely `sd
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q Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 <9;X1XtpI t+0/$ maxRow = nx - 1 yK_$d0ZGE~ maxCol = ny - 1 |H5$VSw For rowNum = 0 To maxRow ' begin loop over rows (constant X) yv)-QIC3 row = "" 'P%&*% For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) vrvi]
Y8 row = row & irrad(colNum,rowNum) & " " ' append column data to row string k#p6QAhS Next colNum ' end loop over columns GW.Y=S Kc>Rd Print #1, row G('UF1F Q7mikg=1- Next rowNum ' end loop over rows %GMCyT Close #1 z`]:\j'O3" %PK(Z*> Print "File written: " & fullfilepath (^<skx> Print "All done!!" _m%Ab3iT~ End Sub v\}{eP' <jLL2-5r0 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: ZiaFByLy Emk:@$3{r 8>X] wA6q 找到Tools工具,点击Open plot files in 3D chart并找到该文件 H8Z|gq1r y+Bxe)6^V g12.4+ 打开后,选择二维平面图: @?t+O'& tS,AS,vy]
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