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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。 #2ta8m), l`N#~<. 成像示意图 S@u46 X> 首先我们建立十字元件命名为Target cpP}NJb0;% |6bvUFr 创建方法: >zX^*T# L +Uq4S^ 面1 : `MPR-"Z6 面型:plane ]-{fr+ 材料:Air 2DFsMT>X 孔径:X=1.5, Y=6,Z=0.075,形状选择Box xCXsyZ2h '#3FEo Os$E,4,py 辅助数据: OHBCanZZ, 首先在第一行输入temperature :300K, HYGd
:SeH emissivity:0.1; lCp6UkE *6AV^^ 9G
SpDc 面2 : :qbU@)p* 面型:plane /"D,gn1S* 材料:Air bk<Rp84vL 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ;6pB7N 77[TqRLf 3c6e$/ 位置坐标:绕Z轴旋转90度, n5UUoBv ,:L^vG@* AP,ZMpw 辅助数据: Cfmd*, Uvm.|p_V 首先在第一行输入temperature :300K,emissivity: 0.1; L5`k3ap| >JE+g[$@ N ~=PecQ Target 元件距离坐标原点-161mm; gdTW
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uCB9;+ Hjw E-C]<{`O 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 B3&C&o.h qsoq1u,? =l/Dc=[ 探测器参数设定: +&VY6(Zj+* 6Y]P7j 在菜单栏中选择Create/Element Primitive /plane o[_,r]%+D J?m/u6 _|12BVq j3-o}6 B2]52Fg-" <lIm==U<- 元件半径为20mm*20,mm,距离坐标原点200mm。 !q,'k2=b, ])F+ C/Px1 光源创建: e`={_R{N 1T|")D 光源类型选择为任意平面,光源半角设定为15度。 "*<vE7 =Mwuhk|* m85ZcyW1T 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。 q>BJ:_I
i Nkj$6(N=zJ 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 KO8{eT9d 0;><@{' ?sdSi-- 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 0`7yPq* Mo N/?VA 创建分析面: :tO4LEb )-[$m% +d=f_@i 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。 | 8mWR=9fs 9FSa=<0wE -JEPh!oTt 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。 Nm&'&L%Ch Q`8-|(ngw FRED在探测器上穿过多个像素点迭代来创建热图 #$S~QS.g a+lNXlh= FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 JjI1^FRd 将如下的代码放置在树形文件夹 Embedded Scripts, Q3hf =&$ \jk*Nm8; ui)mYR[8X 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。 -j<E_!t &aIFtlC 绿色字体为说明文字, J#Y0R"fo 8Pd9&/Y '#Language "WWB-COM" w=_^n]`R 'script for calculating thermal image map &1T)'Bn 'edited rnp 4 november 2005 SW}Rkr\e HN`qMGW^ 'declarations %,vq@..^ Dim op As T_OPERATION ~{{S<S
v Dim trm As T_TRIMVOLUME
YMv}] Dim irrad(32,32) As Double 'make consistent with sampling 2Cy,#X%j> Dim temp As Double o%j?}J7y Dim emiss As Double 7W SP0Xyz Dim fname As String, fullfilepath As String p+?`ru x[TLlV:{ 'Option Explicit 3s%DF, 9teP4H}m Sub Main Ig!0A}f 'USER INPUTS >%`SXB&9 nx = 31 RYvdfj.ij ny = 31 .zdaY,
U numRays = 1000 ~:{ mKc minWave = 7 'microns O,
eoO,gB maxWave = 11 'microns L;*7p9 sigma = 5.67e-14 'watts/mm^2/deg k^4 w+')wyB fname = "teapotimage.dat" Z>g&%3j .9ZK@xM&? Print "" ]XlBV-@b Print "THERMAL IMAGE CALCULATION" {9 |*au(K
d<xi/ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 H~JgZ pw e}{#VB< Print "found detector array at node " & detnode o<lmU8xB= :+\sKEzL srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 Bt")RG
1hi Print "found differential detector area at node " & srcnode ,aezMbg xC9?rLUZ GetTrimVolume detnode, trm uHacu<$= detx = trm.xSemiApe p8j4Tc5tQ> dety = trm.ySemiApe E7R%G OH area = 4 * detx * dety LFi{Q{E) Print "detector array semiaperture dimensions are " & detx & " by " & dety 40
u
tmC Print "sampling is " & nx & " by " & ny 2K/t[.8 6`'g ${U 'reset differential detector area dimensions to be consistent with sampling 2Jiy`(P pixelx = 2 * detx / nx >3b<
Fq$ pixely = 2 * dety / ny cyd&bxPgj+ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ddl]!
^IK Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 m#[c]v{ 8q]"CFpa 'reset the source power a"Iu!$&N SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) E|-5=!]fX Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 32 j){[PL3 @6~m&$R/ 'zero out irradiance array f-i5tnh For i = 0 To ny - 1 WQCnkP For j = 0 To nx - 1 $;=^|I4E irrad(i,j) = 0.0 D,p2MBr Next j s=:LS Next i
73!NoDxb zobFUFx 'main loop z"z$.c EnableTextPrinting( False ) -0;{ >mvE[iXRG? ypos = dety + pixely / 2 \>"Zn7 For i = 0 To ny - 1 lz>.mXdx xpos = -detx - pixelx / 2 DsxNg ypos = ypos - pixely hEo$Jz` so.}WU EnableTextPrinting( True ) 5G2ueRVb Print i 6IK>v*< EnableTextPrinting( False ) >2K'!@~' $!p2Kf>/Q PmsZ=FY For j = 0 To nx - 1 )xg8#M=K v#g:]T xpos = xpos + pixelx \cX9!lHl s H'FqV,) 'shift source &09~ D8f' LockOperationUpdates srcnode, True )iIsnM GetOperation srcnode, 1, op i,RbIZnJ op.val1 = xpos VFq\{@-
% op.val2 = ypos cRag0.[ SetOperation srcnode, 1, op NODg_J~T LockOperationUpdates srcnode, False RJ 4=AA| @pJ;L1sn raytrace 9ec#'i= DeleteRays 2XUIC^<@s CreateSource srcnode w0=/V[fs TraceExisting 'draw t=:5?}J.Q$ c?c"|.-<p 'radiometry =*-ac For k = 0 To GetEntityCount()-1 ZV5IZ&V! If IsSurface( k ) Then j)Q}5M temp = AuxDataGetData( k, "temperature" ) ,Bx0 emiss = AuxDataGetData( k, "emissivity" ) XH!n{Of If ( temp <> 0 And emiss <> 0 ) Then -zt*C&)b ProjSolidAngleByPi = GetSurfIncidentPower( k ) tmoclK- frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) .VmRk9Z irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi &jnBDr End If MdkL_YP}. y~t
e!C End If !q/Q2 N( RcR-sbR Next k g[ @Q iy ;u';$0 Next j $K\;sn; |: HDE5Mg " Next i )g-0b@z!n EnableTextPrinting( True ) E.*wNah"U #{)mr [c| 'write out file *r~6R fullfilepath = CurDir() & "\" & fname F5UHkv"K&O Open fullfilepath For Output As #1 JNvgUb'U Print #1, "GRID " & nx & " " & ny i3(5
' Print #1, "1e+308" `'(@"-L:7 Print #1, pixelx & " " & pixely U+D# Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 eXLdb- U~zy;MT maxRow = nx - 1 t08[3Q& maxCol = ny - 1 :de4Fje/4y For rowNum = 0 To maxRow ' begin loop over rows (constant X) :Xx7':5 row = "" c~\^C_ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 2of+KI: row = row & irrad(colNum,rowNum) & " " ' append column data to row string 9(a*0H Next colNum ' end loop over columns ady
SwB sG|,#XQ Print #1, row & )-fC !;k
^ Next rowNum ' end loop over rows 1iM(13jW Close #1
hJ8B&u( M|.ykA<D Print "File written: " & fullfilepath NfCo)C-t Print "All done!!" [H`5mY@ End Sub 6iH]N*]S^ p+2%LYR u 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: ^(qR({cX vL;=qkTCQ V<n#%!M5gV 找到Tools工具,点击Open plot files in 3D chart并找到该文件 ZGd7e.u= 7Z81+I|&8 %we! J%'Y] 打开后,选择二维平面图: d5W=? Pn}oSCo
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