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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。 ahqsbNu1 ^{w]r5d 成像示意图 6xAR: 首先我们建立十字元件命名为Target K9+%rqC.|` [{cMEV& 创建方法: &kNJs{ j3)fmlA 面1 : kSH|+K\M4 面型:plane "I)`gy& 材料:Air 0ntf%#2{ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box QzX|c&&>u2 L[cl$pYV ]Z#=w 辅助数据: gQ~X;' 首先在第一行输入temperature :300K, b$G&i'd emissivity:0.1; cuW&X9\m, sQ>L3F;A` sqP (1|9 面2 : |*-&x:p7O 面型:plane lgaE2`0 [3 材料:Air jj8h>"d 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ?5MOp 6
s1lf! 1Wy0#?L 位置坐标:绕Z轴旋转90度, yttIA/ wJKP=$6n_ @ob4y 辅助数据: |Wzdu2T %^ z##7^ 首先在第一行输入temperature :300K,emissivity: 0.1; %`1p 8>n o9#8q_D9 ?7"6dp_K Target 元件距离坐标原点-161mm; K,Z_lP_~Vw Y6r<+#V \OX;ZVb?5 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ofIw7D*h T0=%RID%= oUG!=.1}K5 探测器参数设定: LIZsDTU `bx}!;{lx 在菜单栏中选择Create/Element Primitive /plane z c7P 2@ NwPC9!* "hi)p9 _cR ,U^V]jC !<2%N3l #)hJ.0~3 元件半径为20mm*20,mm,距离坐标原点200mm。 Tz{f5c& N(@B3%H2/J 光源创建: ^a+H`RD 27q=~R} 光源类型选择为任意平面,光源半角设定为15度。 P>s3Rh3: c. ;}e:)s G34fxhh 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。 _bm8m4Lk Bc^MZ~+ip 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。 @0{vA\ 8Z:T.Gc Sdn4y(&TP 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。 RC>79e/u< "g=g' W# 创建分析面: "ke>O' 1o*eu&@ [@LA<Z_ 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。 "Smek#l |MQ_VZ{6 e[)oT 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。 mv;;0xH wq@{85 FRED在探测器上穿过多个像素点迭代来创建热图 XD=p:Ezh n?=d)[] 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。 8n1<nS< 将如下的代码放置在树形文件夹 Embedded Scripts, 6<
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!}/4" 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。 u{ +z?N q{:]D(
绿色字体为说明文字, n
9X:s?B/ P^Tk4_,0 '#Language "WWB-COM" f%2>pQTq@) 'script for calculating thermal image map td"D&1eQ@ 'edited rnp 4 november 2005 2:4:Q[{A jf
WZLb) 'declarations oM~;du Dim op As T_OPERATION LI`H,2Km Dim trm As T_TRIMVOLUME cU Dim irrad(32,32) As Double 'make consistent with sampling $9%UAqk9 Dim temp As Double eF%>5 Dim emiss As Double @3_[NI% Dim fname As String, fullfilepath As String A`nw(f_/ io1hUZ 'Option Explicit 9iy3 dy^ Y:-O/X Sub Main X]T&kdQ6q 'USER INPUTS fp`k1Uq@ nx = 31 [42EqVR ny = 31 8v V<A*` numRays = 1000 4?2$~\
x minWave = 7 'microns WPpS? maxWave = 11 'microns OoqA`%
sigma = 5.67e-14 'watts/mm^2/deg k^4 L63B# H" fname = "teapotimage.dat" lv=rL S+*g Print "" 6Ex16 Print "THERMAL IMAGE CALCULATION" u#^~([I u P&< detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 Fd(o8z8Q (S)jV0 Print "found detector array at node " & detnode OB5t+_s J7Y lmi srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ^2}p%j> *< ?~ Print "found differential detector area at node " & srcnode W#sCvI@ k0^t$J
W GetTrimVolume detnode, trm nKu)j3o` detx = trm.xSemiApe Yj'/
p dety = trm.ySemiApe cI/Puh^3 area = 4 * detx * dety }*>xSb1 Print "detector array semiaperture dimensions are " & detx & " by " & dety oH>G3n|U^ Print "sampling is " & nx & " by " & ny X*QQVj t[=teB v< 'reset differential detector area dimensions to be consistent with sampling %SKJ#b pixelx = 2 * detx / nx kl[Jt)"4@ pixely = 2 * dety / ny iQ#dWxw4 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 55K(]%t Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 z5q( <C{uodFll 'reset the source power mF`%Z~}b SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) >uy(N Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" >'g>CD! R^+,D 'zero out irradiance array 3"HX':8x For i = 0 To ny - 1 =OR"Bd:O
For j = 0 To nx - 1 ToE^%J4 irrad(i,j) = 0.0 Z.E@aml\
Next j ywkyxt Next i sB+
B,DF m#a1N 'main loop D9/PVd EnableTextPrinting( False ) V:*6R/Ft "^&Te%x_b ypos = dety + pixely / 2 ?
e<D + For i = 0 To ny - 1 U{?#W xpos = -detx - pixelx / 2 RM6*c
. ypos = ypos - pixely aYrbB# W~Ae&gcn# EnableTextPrinting( True ) ,cCBAOueO Print i ;tG@ 6 EnableTextPrinting( False ) S<Od`I P`TJqJiY~ F$nc9x[S For j = 0 To nx - 1 2Mw^EjR s^zX9IVnp xpos = xpos + pixelx RElIWqgY p|RFpn2ygF 'shift source *9)yN[w LockOperationUpdates srcnode, True >NMq^J'/ GetOperation srcnode, 1, op MYMg/>f[ op.val1 = xpos 9D,/SZ-v op.val2 = ypos }
3JOC!;; SetOperation srcnode, 1, op E9~}%& LockOperationUpdates srcnode, False r"bV{v MR}h}JEx0 raytrace %pBc]n@_ DeleteRays #CTeZ/g CreateSource srcnode t~kh?u].j TraceExisting 'draw gvCQ![ ~Hb2-V 'radiometry 7x//4G For k = 0 To GetEntityCount()-1 Y |'}VU If IsSurface( k ) Then BVe c temp = AuxDataGetData( k, "temperature" ) .
l-eJ emiss = AuxDataGetData( k, "emissivity" ) A|
s\5"?? If ( temp <> 0 And emiss <> 0 ) Then |$G|M=*LN ProjSolidAngleByPi = GetSurfIncidentPower( k ) @s7wKk frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) i>{.Y}; irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi i(an]%'v End If 2 i97 A?4s+A@Eg End If Ee097A?1vj k4+ Q$3" Next k ?AYb@&% y1_z(L;I Next j Bh5z4 f <pJ_ Next i -n~%v0D8c EnableTextPrinting( True ) :]uz0s`> :)DvZx HE@ 'write out file BI :O?!:9) fullfilepath = CurDir() & "\" & fname Y^-D'2P]P Open fullfilepath For Output As #1 |<!xD
iB Print #1, "GRID " & nx & " " & ny E@CK.-N| Print #1, "1e+308" 8Bwm+LYr- Print #1, pixelx & " " & pixely ,KFF[z Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 /4{IxQk 9?zi maxRow = nx - 1 *_H^]wNJG maxCol = ny - 1 8[L]w^ For rowNum = 0 To maxRow ' begin loop over rows (constant X) ,u^%[ejH row = "" ?F/)<r For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) Y[.f`Ei2 row = row & irrad(colNum,rowNum) & " " ' append column data to row string bmI6OIWl Next colNum ' end loop over columns > K s. @YHt[>*S Print #1, row MoC@n+Q+@ {4YD_$4W Next rowNum ' end loop over rows L17{W4 Close #1 80"oT'ZFh P0ZY;/e5h Print "File written: " & fullfilepath 4MPR Print "All done!!" (o518fmR End Sub ~'VVCtA S0H|:J 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: Zy=DY +@qIDUiF3 sOhKMz 找到Tools工具,点击Open plot files in 3D chart并找到该文件 Wiere0 2* $/"QYSF EnP> 打开后,选择二维平面图: EqF>=5* K8{ef
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