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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。 80 s~ae; \[IdR^<YM 成像示意图 m m J)m 首先我们建立十字元件命名为Target SVg@xu+ Z+``/Q]>+ 创建方法: YA;8uMqh; ?(,5eg 面1 : ir@N>_ 面型:plane -aH?7HV} 材料:Air -9H!j4]T? 孔径:X=1.5, Y=6,Z=0.075,形状选择Box $^NWzc "f&i 251 d,oOn.n& 辅助数据: {o5K?Pb 首先在第一行输入temperature :300K, j6R{ emissivity:0.1; St7D.| H%NLL4&wu ,3@15j 面2 : #o r7T^ 面型:plane ?CUp&L0-" 材料:Air d'AviW> 孔径:X=1.5, Y=6,Z=0.075,形状选择Box g]iy-,e 3U9+l0mBa soqNzdTB2 位置坐标:绕Z轴旋转90度, T24#gF~ 2;?wN`}5g= 4na4Jsq{ 辅助数据: /qkIoF2 #`vGg9 首先在第一行输入temperature :300K,emissivity: 0.1; Sj{rvW p\]LEP\z, 9Pob|UA Target 元件距离坐标原点-161mm; yz2oS|0 ' bJ,=yB+0 y8~)/)l& 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 *Xtc`XH :7DVc&0 Etr8lm E 探测器参数设定: HyX4ob[X
DT(Zv2 在菜单栏中选择Create/Element Primitive /plane | 7'yk__m oIL+@}u7 9CU6o:'fW fkv{\zN |v%RjN ,md7.z]U~ 元件半径为20mm*20,mm,距离坐标原点200mm。 Zz)oMw lRATrp#T 光源创建: |b'<XQ&l5 ZhbY,wJ, 光源类型选择为任意平面,光源半角设定为15度。 w6In{uO-Z KlqJEtO_ zS"zb 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。 hPXVPLm7I 4\'81"ei 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。 seV;f^-hR RAuAIiQ uuK]<h* 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。 io?{ew z.9FDQLp 创建分析面: "1`i]Y\' soVZz3F ie)1 h 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。 rPGE-d3 Lz>{FOR fJ"~XTN}T 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。 nIqY}?? |XdrO FRED在探测器上穿过多个像素点迭代来创建热图 F']%q 0 ?eVuz 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。 FZ.z'3I 将如下的代码放置在树形文件夹 Embedded Scripts, Pc;
14M 9oxf)pjw =|V]8 tN 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。 4C9"Q,o%& E29gnYxu8 绿色字体为说明文字, [#rdfN'?U
GxBPEIim '#Language "WWB-COM" )E~\H+FP6 'script for calculating thermal image map %b%<g%@i 'edited rnp 4 november 2005 A8Z?[,Mq! (kNTXhAr4 'declarations Cv(N5mA2 Dim op As T_OPERATION SU}oKii
/ Dim trm As T_TRIMVOLUME iGeT^!N Dim irrad(32,32) As Double 'make consistent with sampling 7(USp#" Dim temp As Double )I-?zyL Dim emiss As Double I
3,e)Z Dim fname As String, fullfilepath As String . .je< u{nWjqrM*5 'Option Explicit 78inh% v4a4*rBI" Sub Main +P)[|y +e 'USER INPUTS j{-7Pf8A nx = 31 wOkJ:k ny = 31 [W;dguh numRays = 1000 Jas|P}{=fT minWave = 7 'microns IoHkcP[H maxWave = 11 'microns 4e\`zy sigma = 5.67e-14 'watts/mm^2/deg k^4 TvG:T{jwy fname = "teapotimage.dat" !E#.WX 4bi\$ Print "" (tLQX~Ur Print "THERMAL IMAGE CALCULATION" i\4"FO?v XaS_3d detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 7^TXlWn^G 2bxMIr Print "found detector array at node " & detnode T9<nD"=: \HEo8~TY
srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 e^_@^(||!6 E0A|+P
'? Print "found differential detector area at node " & srcnode zjh9ZLu[ TdIFZ[<7 GetTrimVolume detnode, trm 5Zm_^IS detx = trm.xSemiApe yrNc[kS/ dety = trm.ySemiApe $ 14DTjj area = 4 * detx * dety Z=[a 8CU Print "detector array semiaperture dimensions are " & detx & " by " & dety FY}*Z=D% Print "sampling is " & nx & " by " & ny =i>F^7)U1 <$2zr4 'reset differential detector area dimensions to be consistent with sampling zd4y5/aoS pixelx = 2 * detx / nx 4
Wd5Goe: pixely = 2 * dety / ny Q~!hr0
ZR SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False $#W6z: Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 =\7p0cq&* TZyQOjUu 'reset the source power JJ=is}S| SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) =usDI<3r Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" lBZ*G w}q@VVB% 'zero out irradiance array NG!Q< !Y For i = 0 To ny - 1 Vzm+Ew
_ For j = 0 To nx - 1 D\*_ulc] irrad(i,j) = 0.0 "UnSZ[;t Next j <+,0G` Next i wggHUr(g, gH)B`
@ 'main loop hdqls0 r EnableTextPrinting( False ) nJH%pBc 4EbiCSo ypos = dety + pixely / 2 ;rAW3 For i = 0 To ny - 1 Y[?Wt/O; xpos = -detx - pixelx / 2 iB`]Z@ZC ypos = ypos - pixely H).5xx[` ^uElQI EnableTextPrinting( True ) A"VXs1>_^ Print i Fe<
t@W EnableTextPrinting( False ) Qs X 59d /O9EI'40) !sQ8,l0h For j = 0 To nx - 1 bXL a~r4\ tKGsrgoV xpos = xpos + pixelx e-)1K iPpJ`i#@+ 'shift source =8_TOvSJ4p LockOperationUpdates srcnode, True S*s9?
GetOperation srcnode, 1, op l%~zj,ew op.val1 = xpos F|{?GV%hF op.val2 = ypos ~0Q72 SetOperation srcnode, 1, op JjML!; LockOperationUpdates srcnode, False j/|qge4 &\[J 'raytrace Lb 4!N`l DeleteRays @??
6)C CreateSource srcnode P32'`!/: TraceExisting 'draw gg_(%.> --)[>6)I 'radiometry %'O(Y{$Y. For k = 0 To GetEntityCount()-1 |JQKxvjT If IsSurface( k ) Then .e#j#tQp temp = AuxDataGetData( k, "temperature" ) P~Owvs/= emiss = AuxDataGetData( k, "emissivity" ) boovCW If ( temp <> 0 And emiss <> 0 ) Then =ab}.dWC ProjSolidAngleByPi = GetSurfIncidentPower( k ) Q3Lqj2r frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) =K8h)B_g irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi -~ Q3T9+ End If '#6DI"vJ
S-|$sV^cG End If KrH;o)| bYH_U4b Next k 7B`0mK3 T/5UlW|\ Next j ,DLNI0uV ]!w52kF7 Next i M!'tD!NWc EnableTextPrinting( True ) SoIMf tX D40VJ3TUc 'write out file tjt#VFq? fullfilepath = CurDir() & "\" & fname
ond/e&1 Open fullfilepath For Output As #1 v*v&f!Ym&s Print #1, "GRID " & nx & " " & ny 6dMpd4"\ Print #1, "1e+308" &>{L"{ Print #1, pixelx & " " & pixely 0AenDm@9 Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 6}2Lt[>O 30"G%DFd maxRow = nx - 1 h,G$e|[? maxCol = ny - 1
^k=[P For rowNum = 0 To maxRow ' begin loop over rows (constant X) 8~&v\GDkF row = "" j)Gr@F> For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) rtz(Jt{< row = row & irrad(colNum,rowNum) & " " ' append column data to row string IRB;Q(Z
Next colNum ' end loop over columns J(60eTwQ
a 8TE Print #1, row [MG:Ym).2` u5[Wr : Next rowNum ' end loop over rows u"ow?[E Close #1 Dl6zl6q? %# #
bg< Print "File written: " & fullfilepath QKxuvW Print "All done!!" l|9`22G End Sub .&xc2sRZ _G`aI*rKsy 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: 5/<Y,eZ/ UPsh Y M Cz3RZK 找到Tools工具,点击Open plot files in 3D chart并找到该文件 [gDvAtTZ5 K\PS$ gV0ZZ"M 打开后,选择二维平面图: 1Mqz+@~11 :tMWy
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