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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。 #+
'@/5{ n b0X[x{k" 成像示意图 0f^.zt{T 首先我们建立十字元件命名为Target )0mDN. !P$xh 创建方法: X t =bc At(9)6n8 面1 : Y2-bU 7mo 面型:plane 8~E)gV+v 材料:Air c0&'rxi(B 孔径:X=1.5, Y=6,Z=0.075,形状选择Box $0}bi:7 r6JkoPMh ts<dUO
辅助数据: 9/Dt:R3QU 首先在第一行输入temperature :300K, v{ n}%akc emissivity:0.1; 3\r@f_p g i'agB^ AnY)T8w 面2 : &|}IBu :T 面型:plane ]?(F'& 材料:Air 5Kj4!Ai 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Ok&>[qu hxVM]e[ V1)P=?%(US 位置坐标:绕Z轴旋转90度, /dt!J
`: DA)v3Nd MuV0;K\ 辅助数据: b0Ov+ )7# !`[I>:Ex 首先在第一行输入temperature :300K,emissivity: 0.1; ""3m!qn# ~88 Tz+
9}cuAVI Target 元件距离坐标原点-161mm; +esNwz_ |.O!zRm Pmlgh&Z 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 Sn2Ds)Pfx3 *}ee"eHs _SC 探测器参数设定: NK9WrUj) ASZ5;N4u 在菜单栏中选择Create/Element Primitive /plane yj'' \ ;K\N eM=) >zl ; [%}Xx ^[}0&_L
w OI_/7@L 元件半径为20mm*20,mm,距离坐标原点200mm。 VnSj:LUD iW1ih QX 光源创建: QeeC2 hLbT\J`I 光源类型选择为任意平面,光源半角设定为15度。 x56
F M1]6lg[si &1E~ \8U 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 #VdI{IbW MAe<.DHY 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 @=NVOJy}c R #3Q$
+yb$[E* 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。 w}W@M,.^ $wYuH9( 创建分析面: _d[2_b1 ?FV7|)f 37O#aJ,K 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。 mE^tzyh J4[x,(iq( Md>f 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。 ?Tc)f_a foz5D9sQ FRED在探测器上穿过多个像素点迭代来创建热图 Z0"& $}^\=p}X FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 F7Dc!JNa 将如下的代码放置在树形文件夹 Embedded Scripts, P10p<@? Dl zmAN rX!+@>4_L 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 =WmBpUh otz_nF;E 绿色字体为说明文字, >2lAy:B5 WE 5"A|
= '#Language "WWB-COM" 3j+=3n, 'script for calculating thermal image map l|vWeBs 'edited rnp 4 november 2005 W"-EC`nP %on9C`/ 'declarations xS~yH[k Dim op As T_OPERATION X40la_[. Dim trm As T_TRIMVOLUME F9k
I'<Q Dim irrad(32,32) As Double 'make consistent with sampling S:p.W=TAB Dim temp As Double ?Rt1CDu Dim emiss As Double d4p{5F7]^ Dim fname As String, fullfilepath As String wWJQ~i? m0I # 'Option Explicit q!hy;K`Jd R(2HYZ Sub Main e7XsyL'|p 'USER INPUTS A]Q1&qM% nx = 31 PTzp;. ny = 31 z;bH<cQ numRays = 1000 ~mXZfG/D minWave = 7 'microns Sv7>IVC?@ maxWave = 11 'microns (>rS
_#^ sigma = 5.67e-14 'watts/mm^2/deg k^4 @ate49W fname = "teapotimage.dat"
NVO9XK ]]J#7L# Print "" (#j2P0B Print "THERMAL IMAGE CALCULATION" bmj8WZ 9C557$nS^ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 ']d!?>C@o (30<oE{ Print "found detector array at node " & detnode sR"zRn fa!3/X+ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 9N~8s6Ob * ?
K4!q' Print "found differential detector area at node " & srcnode `a9k!3_L e9~cBG| GetTrimVolume detnode, trm 9RG\UbX)^| detx = trm.xSemiApe r#_7]_3 dety = trm.ySemiApe pu/m8
area = 4 * detx * dety `e'G.@ Print "detector array semiaperture dimensions are " & detx & " by " & dety !X5o7b ) Print "sampling is " & nx & " by " & ny zW"~YaO%C I@3Q=14k% 'reset differential detector area dimensions to be consistent with sampling $ZQlIJZ pixelx = 2 * detx / nx G$;>ueM pixely = 2 * dety / ny uY&=eQ_Cb SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False l `fW{lh Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 TK;\_yN ftYR,!& 'reset the source power -W|*fKN`3 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) r?64!VS; Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" Ey r5jXt%; d^KBIz8$5l 'zero out irradiance array !(kX~S For i = 0 To ny - 1 zc6Ho For j = 0 To nx - 1 5a=nF9/ irrad(i,j) = 0.0 wl7 M fyU Next j L7SEswMti Next i wn
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Y3-]+y%l 'main loop '"oo;`g7 EnableTextPrinting( False ) iKg75%;t 0Vf)Rw1%I
ypos = dety + pixely / 2 0-*Z<cu%l For i = 0 To ny - 1 !+m@AQ:, xpos = -detx - pixelx / 2 .D+RLO z ypos = ypos - pixely ]}BB/KQy^ q&u$0XmV EnableTextPrinting( True ) ? ouV Print i (FM4 ^#6 EnableTextPrinting( False ) ,/~[S YV*b~6{d pPoH5CzcK For j = 0 To nx - 1 .j:i&j( [!^cd%l xpos = xpos + pixelx s>T`l 2bWUa~%B 'shift source 3f_i1|>)' LockOperationUpdates srcnode, True ]} '^` GetOperation srcnode, 1, op ,,S9$@R op.val1 = xpos }.'Z=yy op.val2 = ypos Zotz?jVVr SetOperation srcnode, 1, op ?p(kh^ z LockOperationUpdates srcnode, False >&BrCu[u H \ 3M raytrace ~NxEc8Y DeleteRays iu+3,]7Fm CreateSource srcnode :#WEx_] TraceExisting 'draw h9)RJSF4 sN-oEqS 'radiometry +Z > < For k = 0 To GetEntityCount()-1 X&s7%]n+ If IsSurface( k ) Then n<E.Em1 temp = AuxDataGetData( k, "temperature" ) s,w YlVYf! emiss = AuxDataGetData( k, "emissivity" ) J=):+F= If ( temp <> 0 And emiss <> 0 ) Then (s088O ProjSolidAngleByPi = GetSurfIncidentPower( k ) T:U4:"
frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) =Ci13< KQ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi Rxx>{+f4M End If )Lb72;!? (Q'U@{s End If @YCv g&bwtEZ Next k e[}],W IdF$Ml#[h Next j Bq *[c=(2 0vDg8i\ Next i @m?{80;uQ EnableTextPrinting( True ) R3?:\d{ QTYYghz 'write out file qp\BV #E fullfilepath = CurDir() & "\" & fname X($6IL6m Open fullfilepath For Output As #1 Ih()/( Print #1, "GRID " & nx & " " & ny QhCY}Q?X Print #1, "1e+308" v{.\iIg N Print #1, pixelx & " " & pixely &
N;pH Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 @HvScg*Y {|XQO'Wg maxRow = nx - 1 z>|)ieL maxCol = ny - 1 (`pNXQ0n For rowNum = 0 To maxRow ' begin loop over rows (constant X) WO@H* row = "" iD<6t_8), For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) jXWNHIl)@ row = row & irrad(colNum,rowNum) & " " ' append column data to row string D
M}s0O$0 Next colNum ' end loop over columns JR)/c6j x<s|vgl| Print #1, row 7WP%J-
E+z18Lf? Next rowNum ' end loop over rows -E]Sk&4Gj Close #1 y:,9I`aW <5I1 DF[ Print "File written: " & fullfilepath 5U~OP Print "All done!!" y
AOg\+ End Sub JpmB;aL#% ]\BUoQ7I/ 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: 5%P[^} 7@IFp~6<qK /l6\^Xf{ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 \TUE<<?1s 2e.N"eLNt ~.6|dw\p! 打开后,选择二维平面图: +#s;yc#=2 1ef'7a7e8
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