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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。 <i</pA 3=sBe HL 成像示意图 L<@*6QH 首先我们建立十字元件命名为Target CO@G%1# @ewaj! 创建方法: NL$z4m0 ;!S5P( 面1 : 5H
XF3 面型:plane = EFh*sp 材料:Air Vf pT5W< 孔径:X=1.5, Y=6,Z=0.075,形状选择Box c.Hw
K\IU 0H>gMXWE] lr~
|=}^ 辅助数据: ,zM@)Q;9 首先在第一行输入temperature :300K, \XV8t|* emissivity:0.1; iko>G j
[lS.Lb ZN$%\,< 面2 : HL4=P,' 面型:plane A(E}2iP9= 材料:Air CYy=f- 孔径:X=1.5, Y=6,Z=0.075,形状选择Box =YgH-{ N s0,Z#Z+ 02t({>` 位置坐标:绕Z轴旋转90度, ["Ts7;q9[ >4luZnWMI 56<U xIa~ 辅助数据: 7yyX8p> #%nV\ Bl 首先在第一行输入temperature :300K,emissivity: 0.1; uPl}NEwU| _xCYh|DlQ| \f^xlX3&` Target 元件距离坐标原点-161mm; 7>gjq'0
fub04x) y@~ VE5N 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 z8t;jw ^@* `vz^_ xtP:Q9!N 探测器参数设定: %P s.r{%{ n46!H0mJ 在菜单栏中选择Create/Element Primitive /plane uOzoE_i xA7~"q&u rIFW1`N}i lH=|Qu (J5}1Q<K *:xOenI 元件半径为20mm*20,mm,距离坐标原点200mm。 \h=*pAf oMg-.!6 光源创建: */IiL%g4u C3W4:kbau 光源类型选择为任意平面,光源半角设定为15度。 /.7RWy` S=)
c7t?a YdO*5Gb6 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。 e7"T37 z7IJSj1gQI 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"< `OMX 9i RVm-0[m} 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。 WC<[<uI* q,)V0Ffe[| 创建分析面: *h0D,O"0 3,q?WH%_ J78.-J5 j0 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。 1Mp-)-e Sk7R;A H@@ 4n%MK 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。 ow9a^|@a G-)e(u
FRED在探测器上穿过多个像素点迭代来创建热图 uc+{<E3,% \78^ O 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。 }ZVond$y4 将如下的代码放置在树形文件夹 Embedded Scripts, cX
C [O *KDTBd @;OsHudd 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 =>5Lp rwXpB<@l@ 绿色字体为说明文字, `$JvWN,kB #d,)Qe[ '#Language "WWB-COM" W
!j-/ql 'script for calculating thermal image map r craf4% 'edited rnp 4 november 2005 %z@ Z^Jv xk~gGT& 'declarations qzNb\y9G Dim op As T_OPERATION |#o' =whTl Dim trm As T_TRIMVOLUME a~jb%i_ Dim irrad(32,32) As Double 'make consistent with sampling #d$zW4ur2 Dim temp As Double nE8z1hBUq Dim emiss As Double C5 ILVQ Dim fname As String, fullfilepath As String 1+$F= M~ :5/Ue,~ag 'Option Explicit `ZEFH7P 9dA+#;? Sub Main Rs"=o>Qu 'USER INPUTS *$%~/Q@] nx = 31 E{ c+`>CY ny = 31 SeXgBbGAne numRays = 1000 Vv+nq_ minWave = 7 'microns dT'}:2 maxWave = 11 'microns c>D~MCNxg sigma = 5.67e-14 'watts/mm^2/deg k^4 W8^A{l4 fname = "teapotimage.dat" %HpPTjAW Ywhhs
}f Print "" :Y /aT[ Print "THERMAL IMAGE CALCULATION" 0' *{BAWx 79>x/jZka detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 H6`k%O* /Q@4HV Print "found detector array at node " & detnode w~Q\:<x&~Z 6w &<j&V srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 rT4Q^t" heIys.p Print "found differential detector area at node " & srcnode :a)RMp+^0 l[[`-f8j GetTrimVolume detnode, trm %!Eh9C* detx = trm.xSemiApe W[J2>`k9 dety = trm.ySemiApe f3!Oc area = 4 * detx * dety P<R^eLZ<& Print "detector array semiaperture dimensions are " & detx & " by " & dety =I'iD0eR Print "sampling is " & nx & " by " & ny ]_B<K5 TW&s c9 'reset differential detector area dimensions to be consistent with sampling i5le0lM pixelx = 2 * detx / nx \m)s"Sh. pixely = 2 * dety / ny `?=3[ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ;/+< N Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 =:g\I6'a hJ8&OCR } 'reset the source power [x7Rq_^ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) h*;c"/7 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units"
'{cND U3Gg:onuE 'zero out irradiance array 4`l$0m@> For i = 0 To ny - 1 _Ml?cT/J.O For j = 0 To nx - 1 cG0)F%?X? irrad(i,j) = 0.0 y]{b4e Next j a7_Q8iMe Next i X_X7fRC0 ]~
N. 'main loop Hz,Gn9:p EnableTextPrinting( False ) [K
#$W wE1 GyN ypos = dety + pixely / 2 hb8oq3*x For i = 0 To ny - 1 4Wz1O$* xpos = -detx - pixelx / 2 )( 3)^/Xz ypos = ypos - pixely D#'CRJh;7 bl!pKOY EnableTextPrinting( True ) 2UYtEJ(?`{ Print i {nSgiqd"28 EnableTextPrinting( False ) WVQHb3Pe0 |+8rYIms` %9zpPrWF For j = 0 To nx - 1 !8|r$mN8 .sit5BX xpos = xpos + pixelx kPy7e~ 4S>#>(n7= 'shift source ?@x$ h LockOperationUpdates srcnode, True h-(NWxK+ GetOperation srcnode, 1, op ]GRVU op.val1 = xpos u=@zYA( op.val2 = ypos EK>x\]O%T SetOperation srcnode, 1, op FiReb3zR LockOperationUpdates srcnode, False ]+pE1-p\ FB?V<x raytrace ecl6>PS$' DeleteRays aC9iNm8w CreateSource srcnode NlhC7 TraceExisting 'draw ^WWr8- arKf9`9 'radiometry (Q `Ps/ For k = 0 To GetEntityCount()-1 ~g[D!HV|yu If IsSurface( k ) Then r4FSQ$[9w temp = AuxDataGetData( k, "temperature" ) (@T{ [\ emiss = AuxDataGetData( k, "emissivity" ) aTHf+; If ( temp <> 0 And emiss <> 0 ) Then pT+OPOSR ProjSolidAngleByPi = GetSurfIncidentPower( k ) e 0$m<5 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) &9v8 irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi K
..Pn17t End If :1t&>x=T :k_)Bh?+ End If @CR<&^s5V 9gK1Gx: Next k {1UU `d 1A;,"8kBd Next j 8=f+`e Xq"9TYf$ Next i Y._ACQG3 EnableTextPrinting( True ) Vd.XZ*}r* [G+@[9hn% 'write out file h+q#|N fullfilepath = CurDir() & "\" & fname 0:`YY8j1k Open fullfilepath For Output As #1 OPq6)(Q Print #1, "GRID " & nx & " " & ny dEf5x_TGm Print #1, "1e+308" jfvlkE-uK Print #1, pixelx & " " & pixely Eos;7$u[ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 k|]l2zlT .d#Hh&jj maxRow = nx - 1 A&KY7[<AC{ maxCol = ny - 1 Bd>ATc+580 For rowNum = 0 To maxRow ' begin loop over rows (constant X) fe6Op row = "" #\ ="^z6 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) TgRG6?#^l row = row & irrad(colNum,rowNum) & " " ' append column data to row string uRuu!{$ Next colNum ' end loop over columns G'HLnx}Yi "AWk
jdj Print #1, row uuUjIZCtz /'v!{m Next rowNum ' end loop over rows Uq%|v Close #1 CpgaQG^ Z>NA 9: Print "File written: " & fullfilepath g*9&3ov Print "All done!!" E[CvxVCx End Sub |~Awm" x1CMW`F 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: JO87rG u0uz~ s rhQO#_` 找到Tools工具,点击Open plot files in 3D chart并找到该文件 La^Zr,T! ZkMHy1 4g.S!-H@R 打开后,选择二维平面图: 5(\[Gke HqOnZ>D
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