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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。 piM11W}|/ .WPR}v,.Z 成像示意图 pl^"1Z=* 首先我们建立十字元件命名为Target odT7Gq F~0%j}ve 创建方法: }rAN2D]"} B,na 面1 : VA&OI;=ri 面型:plane FOnA;5Aa 材料:Air &.bR1wX 孔径:X=1.5, Y=6,Z=0.075,形状选择Box s)'_{ A"h ?0)XS< i(cb&;Xx:A 辅助数据: %K f. F 首先在第一行输入temperature :300K, JU,ROoz( emissivity:0.1; sN`o_q{Q 1NHoIX u:u 7|\q 面2 :
'jl XLb 面型:plane qYiK bzy 材料:Air ?%fZvpn - 孔径:X=1.5, Y=6,Z=0.075,形状选择Box iI Nu`>I rOf :W<,iqSCm 位置坐标:绕Z轴旋转90度, "Ohpb!J9 ;7=JU^@D@ .AI'L|FQ%c 辅助数据: 98BBsjkd r^tXr[} 首先在第一行输入temperature :300K,emissivity: 0.1; JhXN8Bq33 yt#;3 =4\~M"[p Target 元件距离坐标原点-161mm; lJ1xx }k{U (<~R[sT| bFxJ| 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 v^I %Wm ]Sx=y< Lj* =*V 探测器参数设定: r@ *A +=04X F: 在菜单栏中选择Create/Element Primitive /plane ymVd94L U;dt-3?=.h >{)#|pWU yacGJz^f= ;Sl0kSu ]~eWr2uG? 元件半径为20mm*20,mm,距离坐标原点200mm。 mSw?iL bc}OmPE 光源创建: 'Mhdw} ${,eQ\ 光源类型选择为任意平面,光源半角设定为15度。 W$&Ets8zo x9
L\" ?(UXK hs 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。 ]=VI"v<X
_q}%!#4 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。 !PTbR4s :=7;P) A;HKR4p;8 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。 i4Cb&h^ vszAr(
t 创建分析面: BFu9KS+@) Z`KXXlJ^i "T[jQr 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。 ;//qjo
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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。 ~}ZX^l&k{P UimZ/\r FRED在探测器上穿过多个像素点迭代来创建热图 zQfxw?~A KTJ$#1q 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。 )% c)-c 将如下的代码放置在树形文件夹 Embedded Scripts, =W^L8!BE' )O(Gw-jWE Nn\\}R 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。 Q'M Ez D4-U[l+K> 绿色字体为说明文字, B\w`)c yKhzymS}T '#Language "WWB-COM" y_r6T
XnGL 'script for calculating thermal image map f#MN-1[67 'edited rnp 4 november 2005 +'4 dP# )fr\V." 'declarations \~1+T Dim op As T_OPERATION bv];Gk*Z- Dim trm As T_TRIMVOLUME \./2Qc, Dim irrad(32,32) As Double 'make consistent with sampling \Nyxi7 Dim temp As Double _9
O' Dim emiss As Double I2Rp=L:z5 Dim fname As String, fullfilepath As String 'FXZ`+r| EZW?(%b>H 'Option Explicit N^at{I6C . r"?w Sub Main KrzM]x 'USER INPUTS oI/ThM`=q nx = 31 |th )Q ny = 31 U\6DEnII?! numRays = 1000 [AwE minWave = 7 'microns UGgi) maxWave = 11 'microns 31Du@h8YX sigma = 5.67e-14 'watts/mm^2/deg k^4 DR=1';63 fname = "teapotimage.dat" C" WZsF^3 gH.^NO5\' Print "" Rw%KEUDm Print "THERMAL IMAGE CALCULATION" {`55nwd u9(AT>HxT detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 tBQ>
p. \)WjkhG<w# Print "found detector array at node " & detnode D._r@~o qo|iw+0Y srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 H_]kR&F8 #Xly5J Print "found differential detector area at node " & srcnode 5Bk voE c'JET GetTrimVolume detnode, trm wl9icrR> detx = trm.xSemiApe WF G/vzJ dety = trm.ySemiApe .}s a2- area = 4 * detx * dety _aYQ(FO Print "detector array semiaperture dimensions are " & detx & " by " & dety :8
:>CHa Print "sampling is " & nx & " by " & ny Cv33?l-8%_ } d6^ 'reset differential detector area dimensions to be consistent with sampling eNb =` pixelx = 2 * detx / nx Y.J$f<[R pixely = 2 * dety / ny WkE;tC* SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False g-36Q~`9v Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 GYO"1PM xH uyfQLk 'reset the source power ?Fu.,srt SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 3&f{lsLAC Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" zT8K})# 8wOPpdc 'zero out irradiance array ^gImb`<6- For i = 0 To ny - 1 IT|CfQ [D For j = 0 To nx - 1 X,~C irrad(i,j) = 0.0 mDUS9> Next j 3(kZfH~ Next i Y!zlte|P =9-c*bL 'main loop Q>$v~v?9 EnableTextPrinting( False ) PR0]:t)E sXA=KD8 ypos = dety + pixely / 2 ?fGY,<c For i = 0 To ny - 1 9L,T @#7 xpos = -detx - pixelx / 2 6*tGf`Pfdw ypos = ypos - pixely cqDnZ`|6 7JbrIdDl| EnableTextPrinting( True ) "\
md Print i ryPzq}# EnableTextPrinting( False ) ~Q5HM QMP:} %?ad.F+7 For j = 0 To nx - 1 p6p_B 7-)KTBFL xpos = xpos + pixelx *
-)aGL <pCZ+Yv E" 'shift source TD<. :ul] LockOperationUpdates srcnode, True 7o3f5"z GetOperation srcnode, 1, op %y'#@%kO:S op.val1 = xpos 38F8(QU{ op.val2 = ypos LvS` SetOperation srcnode, 1, op zKo,B/Ke4 LockOperationUpdates srcnode, False P:G^@B3^ CKK8 o9W raytrace 7y!{lr=n DeleteRays 8Pq|jK " CreateSource srcnode @C#lA2(I4 TraceExisting 'draw Dcq^C LPY 9496ayi 'radiometry /1YqDK0 For k = 0 To GetEntityCount()-1 hq|/XBd|| If IsSurface( k ) Then p4=^
UP temp = AuxDataGetData( k, "temperature" ) NeYj[Q~xy emiss = AuxDataGetData( k, "emissivity" ) ^c*'O0y[D If ( temp <> 0 And emiss <> 0 ) Then OvkY zI` ProjSolidAngleByPi = GetSurfIncidentPower( k ) kAMt8 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) B--`=@IRf" irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ebf0;1! End If FKPI{l cOcm9m# End If \O[Cae:^? *&7Av7S Next k r>Vgo):s rLVS#M#&e> Next j 2!A/]:[F SKGYmleR Next i 8d-_'MXk3 EnableTextPrinting( True ) K:mb$YJ& E$gcd#rT 'write out file _15r!RZ:1 fullfilepath = CurDir() & "\" & fname UhNeY{6 Open fullfilepath For Output As #1 JVRK\A|R Print #1, "GRID " & nx & " " & ny 6 LC*X Print #1, "1e+308" [!"u&iu` Print #1, pixelx & " " & pixely qvCl
mZ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 y 2bZo'Z D+tn<\LF maxRow = nx - 1 @X:P`?("^ maxCol = ny - 1 e tY9Pq For rowNum = 0 To maxRow ' begin loop over rows (constant X) oE}1D?3Sp row = "" wJip{ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) .pZwhb row = row & irrad(colNum,rowNum) & " " ' append column data to row string J?HYN% Next colNum ' end loop over columns vV8}> MbYAK-l.h Print #1, row =F6J%$ DJhi>!xJ Next rowNum ' end loop over rows aB.`'d)V Close #1 -3A#a_fu B+ +:7! Print "File written: " & fullfilepath Ao2t=vg Print "All done!!" HKV]Rn End Sub El,p}Bi. ;a2TONW 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: k? X7h2 Iq MXd K| Ji gc@@B. 找到Tools工具,点击Open plot files in 3D chart并找到该文件 iphe0QE[#} wUab)L s#>Bwn&b) 打开后,选择二维平面图: IZ"d s=w Z3)1!|#Q
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