| infotek |
2022-01-24 09:30 |
十字元件热成像分析
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。 mE_% JY@bD:
成像示意图 kR3wbA 首先我们建立十字元件命名为Target ay|jq"a TQb@szp:| 创建方法: l fFRqZ {~w( pAx 面1 : V^4v`}Wgx 面型:plane ![$`Ivro` 材料:Air Bex;!1 孔径:X=1.5, Y=6,Z=0.075,形状选择Box J5n6K$.d Hpa6;eT
7r^Cs#b+I 辅助数据: ZjY,k 首先在第一行输入temperature :300K, m.!LL]] emissivity:0.1; 5*+DN
U@ #Hz9@H QAt]sat 面2 : [VqiF~o, 面型:plane X)6 G :cD 材料:Air 4f~sRubK 孔径:X=1.5, Y=6,Z=0.075,形状选择Box EZ:?
(|h pJs`/ dQ~GE}[ 位置坐标:绕Z轴旋转90度, ZZZ`@pXm; v#d(Kj
B9[vv;lzu 辅助数据: +nHr+7} CM$&XJzva 首先在第一行输入temperature :300K,emissivity: 0.1; wN10Drc
}h1LH4 q,<l3r In Target 元件距离坐标原点-161mm; d}tmZ*q )">#bu$
he/rt# 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 .ahY 1CO a'/C)fplL A,t g268 探测器参数设定: 5z9hcQAS )/JVp> 在菜单栏中选择Create/Element Primitive /plane ,YjjL >~Gy+-
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Pzgn@D }No #_{ -,YI>! 元件半径为20mm*20,mm,距离坐标原点200mm。 P^=B6>e 1Az&BZU[ 光源创建: & wtE"w b;d7mh4 光源类型选择为任意平面,光源半角设定为15度。 u{&=$[; DJ7ak>"R
;di.U, 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 5de1r B| Lg(G&ljE@k 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 37:tu7e~c -T1R}ew*t {d'B._#i 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 "%+||IyW }Hg\
tj}i 创建分析面: xu"-Uj1 HJJ)D E7; x1`(Z|RJ 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 k$m'ebrS.~ 9z{}DBA
^Ss<< 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。 j DEym&- #K@!jh)y^ FRED在探测器上穿过多个像素点迭代来创建热图 L\"wz scn UtJfO`m9P 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。 2-qWR<E 将如下的代码放置在树形文件夹 Embedded Scripts, m(:R (K(je YGM7? o
3hBYx@jTO 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。 S{bp'9]$y e@vZg8Ie 绿色字体为说明文字, R+He6c!?9 9Z=hg[`]< '#Language "WWB-COM" j|o/>^ 'e 'script for calculating thermal image map H(--hG5} 'edited rnp 4 november 2005 SJO*g&duQ dc~vQDNw[X 'declarations +/%4E % Dim op As T_OPERATION 7^Us Dim trm As T_TRIMVOLUME rfQs
7S;G Dim irrad(32,32) As Double 'make consistent with sampling --TH6j" Dim temp As Double Zn.S65J*u Dim emiss As Double NcwUK\ Dim fname As String, fullfilepath As String s2QgR37s> tRc3<> 'Option Explicit ASMItT qkc,93B3 Sub Main S\sy^Kt~4: 'USER INPUTS 5oYeUy>N nx = 31 xOg|<Nnl ny = 31
#z.\pd numRays = 1000 K^GvU 0\ minWave = 7 'microns V_v+i c^ maxWave = 11 'microns >dF #1 sigma = 5.67e-14 'watts/mm^2/deg k^4 _f "I%QTL fname = "teapotimage.dat" v[x 5@$ !f/^1k}SR Print "" _h=h43'3 Print "THERMAL IMAGE CALCULATION" 5HL>2
e[ iK'A m.o+ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 i
^N}avO HP 3%CB Print "found detector array at node " & detnode "].TKF#yg lu.xv6+ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 kIt1k w o0b\<} Print "found differential detector area at node " & srcnode ci(BPnQ aa!1w93?i GetTrimVolume detnode, trm AC fhy[, detx = trm.xSemiApe M5`m5qc3 dety = trm.ySemiApe _J"J[$ area = 4 * detx * dety EmP2r*"rb Print "detector array semiaperture dimensions are " & detx & " by " & dety X88I|Z'HIh Print "sampling is " & nx & " by " & ny pAN$c" ih:%U 'reset differential detector area dimensions to be consistent with sampling 5=8_Le pixelx = 2 * detx / nx vl%Pg!l pixely = 2 * dety / ny OQuTM[W SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ={ 190=\9 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 MD> E0p) rHjR 4q 'reset the source power ,0>_(5 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) d+eb![fi Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 7#T@CKdUd V-i:t,*lk( 'zero out irradiance array g@>y`AFnr For i = 0 To ny - 1 _1$+S0G; For j = 0 To nx - 1 Qej<(:J5 irrad(i,j) = 0.0 wYHyVY2tj2 Next j )=,;-&AR Next i "rQ?2?
.8|5;!`WB 'main loop <("P5@cExU EnableTextPrinting( False ) H{d/%}7[v Qcs0w( ypos = dety + pixely / 2 a9nXh6 For i = 0 To ny - 1 (G"/C7q xpos = -detx - pixelx / 2 Ahg6>7+R. ypos = ypos - pixely mP)im]H "r{
^Y?? EnableTextPrinting( True ) <*{(> Print i mO\=#Q> EnableTextPrinting( False ) 1g|6,J dFpP_U {y:+rh& For j = 0 To nx - 1 yucbEDO. sWLH"'Z xpos = xpos + pixelx Dw2$#d =(5}0}j 'shift source $4TawFf"nc LockOperationUpdates srcnode, True UDa\* GetOperation srcnode, 1, op lGX_5R op.val1 = xpos qjvIp- op.val2 = ypos ;|K(6) SetOperation srcnode, 1, op S#7.y~e\ LockOperationUpdates srcnode, False }KrZ6cG9# Wuji'sxTs raytrace *:,7
A9LY DeleteRays :cTwp K CreateSource srcnode 1FC1*7A[ TraceExisting 'draw C
F< TqMy">> 'radiometry nr{}yQu For k = 0 To GetEntityCount()-1 B3Esfk If IsSurface( k ) Then u:4?$%rB temp = AuxDataGetData( k, "temperature" ) ps?B;P emiss = AuxDataGetData( k, "emissivity" ) SbpO<8}8 If ( temp <> 0 And emiss <> 0 ) Then C[(Exe ProjSolidAngleByPi = GetSurfIncidentPower( k ) %OsV(7 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) j6)@kW9x irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ?x
&"EhA> End If ^)/oDyO ldm=uW End If s|&2QG0'7 *YY:JLe Next k V?Zvu9b& }u..m$h Next j E%+1^
L jCbxI^3A Next i g8w5X!Z
EnableTextPrinting( True ) )Ikx0vDFQ J;BG/VI1 'write out file +#y[sKa fullfilepath = CurDir() & "\" & fname (@?PN+68| Open fullfilepath For Output As #1 xlaBOK a% Print #1, "GRID " & nx & " " & ny 5gbJTh<JU Print #1, "1e+308" R|AGN*. Print #1, pixelx & " " & pixely e[8p /hId Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 s?*MZC G%K<YyAP maxRow = nx - 1 nPUq+cXy]C maxCol = ny - 1 Jk7[}Jc$ For rowNum = 0 To maxRow ' begin loop over rows (constant X) fXYg % row = "" vrIM!~*W For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) !Hr
+|HKQ? row = row & irrad(colNum,rowNum) & " " ' append column data to row string Fu (I<o+T- Next colNum ' end loop over columns p68)
0 PRCr7f Print #1, row rm4j8~Ef ef!V EtEOv Next rowNum ' end loop over rows pOip$Z Close #1 '?k*wEu |nj%G< Print "File written: " & fullfilepath C@L:m1fz Print "All done!!" #3u;Ox End Sub _>*$%R "ND 7,rQ 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: }T+pd#> /\_ s 9oY%v7 找到Tools工具,点击Open plot files in 3D chart并找到该文件 ^YKEc0"w( Bf F$ @$;"nVZ4v 打开后,选择二维平面图: ^r$P&}Z\b [ua{qJ9
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