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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。 )+Y"4?z~ h! Bg}B~ 成像示意图 [ $5u:* 首先我们建立十字元件命名为Target h% eGtd$n PI.Zd1r 创建方法: ,j6R/sg @>,GCuPrm 面1 : %*NED zy 面型:plane [l/!&6 材料:Air Lb?WhjqZ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 9}wI@ K491QXG _N {4Rs0 辅助数据: [D+,I1u2h 首先在第一行输入temperature :300K, ppo0DC\> emissivity:0.1; x2sKj"2?@ [Tl66Eyl G6.lRaPu"m 面2 : DRpFEWsm 面型:plane g>@a 材料:Air boI&q>-6Re 孔径:X=1.5, Y=6,Z=0.075,形状选择Box &) 64:l& d>?C?F K {kd:pr 位置坐标:绕Z轴旋转90度, >8ryA$ ,CI-IR2 P!"{-m' 辅助数据: >$tU @mq !?>QN'p.b 首先在第一行输入temperature :300K,emissivity: 0.1; C1fd@6 EDz;6Z*4N }hsNsQ Target 元件距离坐标原点-161mm; t7xJ$^p[|K dl"=ZI
'^ <(@Z#%O9) 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 {i+
o'Lw tz8fZ*n rFGPS%STS 探测器参数设定: q1q9W@H S6}_N/;6~ 在菜单栏中选择Create/Element Primitive /plane 064k;|>D b*(K;`9)B PZQAlO, /* qx5$~ Qu1&$oO O_qwD6s-_ 元件半径为20mm*20,mm,距离坐标原点200mm。 /@|iI<| }S8aR:' 光源创建: \gA<yz-;N L}CU" 光源类型选择为任意平面,光源半角设定为15度。 8R%<~fq r 0TaI"/ai %g:'6%26 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。 dOKp:|9G KJV8y"^=Q 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。 EcL6lNTR+ Lu{/"&) \I:27:iAL 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。 ^8EW/$k _?:jZ1wZ 创建分析面: QRvyaV >I0;MNX p:TE## 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。 \c<;!vkZ04 $K!Jm7O\ $cIaLq 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。 z]r'8Jc jhf#
gdz% FRED在探测器上穿过多个像素点迭代来创建热图 hcj]T? J}&U[ds p 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。 0uIY6e0E 将如下的代码放置在树形文件夹 Embedded Scripts, )2RRa^=& vRH^en ,|d9lK`" P 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。 sWo}Xq# Mib.,J~ 绿色字体为说明文字, ^7wqb'xg >vp4R` '#Language "WWB-COM" ?5J#
yn 'script for calculating thermal image map triU^uvh 'edited rnp 4 november 2005 ~9 .=t ' W]#w4Fp! 'declarations {QM rgyQE Dim op As T_OPERATION w")
G:K Dim trm As T_TRIMVOLUME uUg;v/: Dim irrad(32,32) As Double 'make consistent with sampling %Y%r2 Dim temp As Double WI4<2u; Dim emiss As Double w.w{L=p:<" Dim fname As String, fullfilepath As String L4Zt4Yuw I{OizBom 'Option Explicit V\Gs&> o *J*}y Sub Main :c~SH/qS 'USER INPUTS 5aizWz nx = 31 ?VNtT/ ny = 31 sJ|pR=g)! numRays = 1000 c 9f"5~ minWave = 7 'microns ]B,tCBt maxWave = 11 'microns h40;Q<D sigma = 5.67e-14 'watts/mm^2/deg k^4 *sOb I(& fname = "teapotimage.dat" {lWV H k}v`UiGM Print "" *rmC3'}s Print "THERMAL IMAGE CALCULATION" $KYGQP A:< %> detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 It[51NMal ?{qUn8f2 Print "found detector array at node " & detnode 8In\Jo$|q> 4HGTgS srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 s{@R|5 8{jXSCP# Print "found differential detector area at node " & srcnode ;&&<zWq3h ,gVVYH?qR GetTrimVolume detnode, trm 3_)I&RM detx = trm.xSemiApe QcL@3QC dety = trm.ySemiApe \W.CHSD area = 4 * detx * dety d}4NL:=& Print "detector array semiaperture dimensions are " & detx & " by " & dety :s_>y_=g Print "sampling is " & nx & " by " & ny U`qkeNd qR'FbI 'reset differential detector area dimensions to be consistent with sampling 6^gp
/{ pixelx = 2 * detx / nx M!J7Vj?Ps pixely = 2 * dety / ny aDdGhB SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False \:4*h Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 btuG%D{a^ mcV<)UA} 'reset the source power $\BYN=# SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) #SHeK 4 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" [Kwj
7q` G1z*e.+y 'zero out irradiance array pX_#Y)5 For i = 0 To ny - 1 \Osu1]Jn> For j = 0 To nx - 1 ,GH`tK_ irrad(i,j) = 0.0 &IQ=M.!r Next j U*[E+Uq}:N Next i 8:{id>Mm^ F-/z@tM 'main loop j+_fHADq EnableTextPrinting( False ) J 6KHc^,7 L[Vk 6e ypos = dety + pixely / 2 Y6v{eWtSn For i = 0 To ny - 1 vN{@c(=g xpos = -detx - pixelx / 2 r!Aj5 ypos = ypos - pixely cX-M9Cz 6j(/uF4!# EnableTextPrinting( True ) W'@|ob Print i (L/>LZn| EnableTextPrinting( False ) yl-:9|LT XZIapT a!$kKOK For j = 0 To nx - 1 N[/<xW~x?4 }YDi/b7 xpos = xpos + pixelx >s^$- ?Zb+xN KJ( 'shift source L0wT :x* LockOperationUpdates srcnode, True %l7[eZ{Y GetOperation srcnode, 1, op L0g+RohW op.val1 = xpos sC-o'13 op.val2 = ypos N1~bp?$1 SetOperation srcnode, 1, op OMLU ;,4 LockOperationUpdates srcnode, False Cb ;6yE)!Z z)3TB&; 'raytrace !2|Lb'O DeleteRays <<>+z5D+ CreateSource srcnode |owr?tC TraceExisting 'draw Ooz,?wU6 E'LI0fr 'radiometry aS [[
AL For k = 0 To GetEntityCount()-1 +Ryj82;59z If IsSurface( k ) Then fUjo',<s temp = AuxDataGetData( k, "temperature" ) LIID(s!bX emiss = AuxDataGetData( k, "emissivity" ) cLZ D\1Mt If ( temp <> 0 And emiss <> 0 ) Then |o5eG>< ProjSolidAngleByPi = GetSurfIncidentPower( k ) =d{6=2Pt frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) z&%i"IY irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi T)mQ+&| End If xWG@<}H ,R{&x7 End If &O'W+4FAc A%8
Q}s$<s Next k XJ<"S
p 0/Q_%
: Next j w5m/[Z c u/"=]D Next i DsHF9Mn EnableTextPrinting( True ) s%D%c;.| <&E}db 'write out file HgQjw! fullfilepath = CurDir() & "\" & fname oYu xkG Open fullfilepath For Output As #1 eGEwXza 4 Print #1, "GRID " & nx & " " & ny Nn05me"X Print #1, "1e+308" qd0G sr}j Print #1, pixelx & " " & pixely OR@
67Y Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 X/4CXtX^ +M=h+3hw]( maxRow = nx - 1 >+%#m'Y&& maxCol = ny - 1 px;~20$e For rowNum = 0 To maxRow ' begin loop over rows (constant X) <,~OcJG( row = "" d7V/#34 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) KtQs uL% row = row & irrad(colNum,rowNum) & " " ' append column data to row string ^OY$
W Next colNum ' end loop over columns ~}_^$l8#-Q P'<i3#;7X Print #1, row I*-\u eHgr"f*7
Next rowNum ' end loop over rows ?IGp?R^j" Close #1 ud/!@WG Lvf<g}?4 Print "File written: " & fullfilepath >6C\T@{lJ Print "All done!!" [piK"N End Sub +p\E%<uQ tb&?BCp 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: d'_q9uf' iWt%Boyi B
/;(#{U; 找到Tools工具,点击Open plot files in 3D chart并找到该文件 g}+|0FTV q'jOI_b 1GN^uia7 打开后,选择二维平面图: d*6f,z2= )w].m
QQ:2987619807 )?jFz'<r
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