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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。
ls7P$qq SJlE!MK 成像示意图 "WO0rh` 首先我们建立十字元件命名为Target )[r=(6?n Zb|a\z8 ? 创建方法: ,nGQVb ^]~!:Ej0 面1 : ET 0(/Zz 面型:plane <`NsX
6t 材料:Air !_;J@B 孔径:X=1.5, Y=6,Z=0.075,形状选择Box >,I'S2_Zl lC,~_Yb 45$aq~%as 辅助数据: &%8IBT 首先在第一行输入temperature :300K, ,'9R/7%s emissivity:0.1; 8V9OMOt! 0PsQ
1[1 zMBGpqdP 面2 : z|Yt|W 面型:plane ;sq xFF@ 材料:Air bR~5
:A^ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box [9:";JSl"Y 3(vm'r&5n> bd% M., 位置坐标:绕Z轴旋转90度, +c,
^KHW _-^mxC|M !c-MC| 辅助数据: SBf=d<j 1) \Sv|yQUT 首先在第一行输入temperature :300K,emissivity: 0.1; :i@
$s/ Q9B!0G.-bs n%iL+I Target 元件距离坐标原点-161mm; "r3h+(5 ~l{Qz0& i~R+g3oi 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 &^uaoB0 m_BpY9c]5 LU`) 探测器参数设定: &-JIXVd*R -1`}|t; 在菜单栏中选择Create/Element Primitive /plane 51H6
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V[kn'QkWv Y9vVi]4 bFlI:R&< 元件半径为20mm*20,mm,距离坐标原点200mm。 ]KXyi;n2 DIWyv- 光源创建: pF8:?p['z OL:hNbw'~T 光源类型选择为任意平面,光源半角设定为15度。 RL/7>YQ TcJJ"[0 F MYcZ+4 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。 !r/~D | Fi\)ka\u 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。 GK6CnSV8d zb02\xvf ;X0uA? 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。 riaL[4c #N64ZXz_ 创建分析面: D!Nc&|X^ ]n<Ba7Y A&%7Z^Pp 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。 R~hIo aiN u|u)8;'9( ~|ZAS] 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。 3pL4Zhf M(C}2.20 FRED在探测器上穿过多个像素点迭代来创建热图 OT6Te& h^`@%g9 S 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。 DRXUQH 将如下的代码放置在树形文件夹 Embedded Scripts, >uQjygjj ui|6ih$+ B4+u/hkbh? 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 U~@;2\
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vk( I7 '#Language "WWB-COM" l=S!cj; 'script for calculating thermal image map ;pfN 'edited rnp 4 november 2005 5INw#1~ g/P1lQ) 'declarations 2e3AmR@* Dim op As T_OPERATION xcQ^y}JN Dim trm As T_TRIMVOLUME `zl,|}u) Dim irrad(32,32) As Double 'make consistent with sampling xCT2FvX6 Dim temp As Double f><V;D# Dim emiss As Double XbFo#Pwk Dim fname As String, fullfilepath As String Ah5o>ZtcO .Zs.O/ 'Option Explicit .RmoO\
,Gm FB>P39u Sub Main -O/[c 'USER INPUTS 2_?VR~mA# nx = 31 ;G"!y<F ny = 31 xt`a":lr u numRays = 1000 1Ak0A6E minWave = 7 'microns F J?]|S.?, maxWave = 11 'microns i??+5o@uTF sigma = 5.67e-14 'watts/mm^2/deg k^4 4 EA$<n(A- fname = "teapotimage.dat" .N\t3\9} Ag2Q!cq Print "" |Dq?<Ha Print "THERMAL IMAGE CALCULATION" 8(S|=c R ZGCp[2$ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 Zc&pJP+M'U $ >].;y?$ Print "found detector array at node " & detnode EKsOj&ZiJ By}ZHK94I srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 55y{9.n* q$}J/w(, Print "found differential detector area at node " & srcnode _@y9=e >!o!rs GetTrimVolume detnode, trm r4K%dx-t detx = trm.xSemiApe P$^I\aGO dety = trm.ySemiApe [kgCB7.V area = 4 * detx * dety 19oyoi" Print "detector array semiaperture dimensions are " & detx & " by " & dety ;4v`FC> Print "sampling is " & nx & " by " & ny B/hQvA;( `7V1 F.\ 'reset differential detector area dimensions to be consistent with sampling d$?+>t/ pixelx = 2 * detx / nx A
L|,\s pixely = 2 * dety / ny 0 EA3>$; SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False G[OJ<px Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 "tpD -> X;vUz 'reset the source power Lc-WfzT SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) S'@Ok=FSy Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 4`RZ&w;1H2 X"HVK+ 'zero out irradiance array { W5
_KX For i = 0 To ny - 1 |&bucG= For j = 0 To nx - 1 4)L};B= irrad(i,j) = 0.0 ;vpq0t` Next j +#X+QG Next i ZR{YpLFQ Y2g%{keo 'main loop vn@sPT EnableTextPrinting( False ) *$1F|G 8e`HXU(A ypos = dety + pixely / 2 7s}F`fjKP For i = 0 To ny - 1 X1V~.kvt) xpos = -detx - pixelx / 2 u{l4O1k/c ypos = ypos - pixely v&f\ Jv7 !l6ht{ EnableTextPrinting( True ) ps/|^8aGZ Print i >.XXB
5a EnableTextPrinting( False ) }XCh>LvX qB`%+<)C >+:cTQ|q For j = 0 To nx - 1 $!\L6;: bIV9cpW xpos = xpos + pixelx X@)'E9g5: $8[JL\ 'shift source r,L`@A=v LockOperationUpdates srcnode, True Zu2
$$_+L GetOperation srcnode, 1, op |0_5iFAB| op.val1 = xpos uY3#, op.val2 = ypos iI*qx+>f? SetOperation srcnode, 1, op :x?G[x= LockOperationUpdates srcnode, False _,p/2m-Pj TA#pA(k 'raytrace AthR|I|8 DeleteRays [DtMT6F3 CreateSource srcnode ;9Wimf]G,E TraceExisting 'draw J10&iCr{r* 8CvNcO;H0 'radiometry t0^)Q$ For k = 0 To GetEntityCount()-1 QlH[_Pi If IsSurface( k ) Then {OS[0LB temp = AuxDataGetData( k, "temperature" ) JX{rum emiss = AuxDataGetData( k, "emissivity" ) v|3mbApv If ( temp <> 0 And emiss <> 0 ) Then ZA'0q ProjSolidAngleByPi = GetSurfIncidentPower( k ) C
MGDg} frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ~ntDzF irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi Gxt6]+r End If V[7D4r.j $?pfst~;O End If y'^b{q@ `vf]C' Next k ~C?)-
]bF 4:kDBV;v Next j $5Rx>$~+d h6tYy_(G Next i o$}$Z&LK EnableTextPrinting( True ) ;iUO1t)^ ykxAm\O 'write out file $bZ5@)E fullfilepath = CurDir() & "\" & fname Ve40H6Ox Open fullfilepath For Output As #1 pE.TG4 Print #1, "GRID " & nx & " " & ny xp]9Z]J1l Print #1, "1e+308" ~O3VX75f Print #1, pixelx & " " & pixely JPg^h Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 TEC#owz RgzzbW maxRow = nx - 1 &uf|Le4 maxCol = ny - 1 h6;zAM} For rowNum = 0 To maxRow ' begin loop over rows (constant X) sAF="uB row = "" )k4&S{= For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 5`::#[ row = row & irrad(colNum,rowNum) & " " ' append column data to row string }CrWmJu0 Next colNum ' end loop over columns KJt6d`ZN *nV"X0& Print #1, row $3eoZ1q'U- mdcsL~R Next rowNum ' end loop over rows 9]I{GyH Close #1 Bc< |