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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。 BIM!4MHLA / ~\ I 成像示意图 "-U`E)]w*[ 首先我们建立十字元件命名为Target #3WKm*T/ <RFT W}f! 创建方法: aGRD`ra TODTR7yGo 面1 : F CbU> 1R 面型:plane n( } zq
材料:Air lz-t+LD@ST 孔径:X=1.5, Y=6,Z=0.075,形状选择Box q]qKU`m!Q` ;94e 3tZC&!x? 辅助数据: |sIr}} 首先在第一行输入temperature :300K, QwaAGUA emissivity:0.1; 4*vV9*'! Y>l92=G )8rN 面2 : TcP
(?v 面型:plane s,*kWy"jp 材料:Air '. '} 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 8>KBh)q Fz 6&.f R;{y]1u 位置坐标:绕Z轴旋转90度, IB
sQaxt. 7 z#Xf \`!M5FJ 辅助数据: :{YOJDtR ox2?d<dC6 首先在第一行输入temperature :300K,emissivity: 0.1; =%\y E0# >>nt3q "")I1iO
g Target 元件距离坐标原点-161mm; D_W,Jmet V:wx@9m) GF3"$?Cw 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 Uo7V)I;o iLyJ7zby 1syI%I1 探测器参数设定: QS*!3?% ]0+5@c 在菜单栏中选择Create/Element Primitive /plane *u|bmt 9~En;e .YT&V Rpi@^~aPE x2KIGG^ \+STl#3*q 元件半径为20mm*20,mm,距离坐标原点200mm。 QQB\$[M!Z EzXGb 光源创建: rerl-T<3 _,U`Iq+X 光源类型选择为任意平面,光源半角设定为15度。 .+'`A"$8 &f:"p*=a\ C_RxJWka 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。 ^F*G )Hp{8c 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。 "i}?jf
{a #} )OnM^], SR4cR)Iz 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。 $eI=5
bK7j" 创建分析面: TxN'[G 7<ZP (I5X |@rPd=G^(/ 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 RwG@C|sG Yb~[XS |p :dZq!1~t 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 ;Tn$c70 |fJpX5W-l FRED在探测器上穿过多个像素点迭代来创建热图 sI@y)z rr@S|k:| 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。
Y\Z.E; 将如下的代码放置在树形文件夹 Embedded Scripts, r fl-(_3 aBH!K
2itJD1; 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。 (.:!_OB0N 4490l" 绿色字体为说明文字, (sXR@Ce$ (4hCT* '#Language "WWB-COM" Y6>@zznk 'script for calculating thermal image map nkv+O$LXP 'edited rnp 4 november 2005 'T8(md299 Ic%c%U=i 'declarations x8#bd{ Dim op As T_OPERATION ?8g*"&cn Dim trm As T_TRIMVOLUME C6$F.v Dim irrad(32,32) As Double 'make consistent with sampling 9L$bJO-3 Dim temp As Double jJ}3WJ Dim emiss As Double Y[hTO.LF Dim fname As String, fullfilepath As String E3):8>R;1 8BL]]gT-I 'Option Explicit 8>}k5Qu +/bT4TkML Sub Main ({GN.pC( 'USER INPUTS _I"T(2Au nx = 31 hzT,0<nw ny = 31 iiWs]5 numRays = 1000 )}
I>"n minWave = 7 'microns !rK,_wH
maxWave = 11 'microns G(g.~|=EZ sigma = 5.67e-14 'watts/mm^2/deg k^4 8"f Z>XQ fname = "teapotimage.dat" q;W(;B 8f\sG:$ Print "" M<4tjVQ6 Print "THERMAL IMAGE CALCULATION" 9^ DXw! =B0#z]qu detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 z1-JoZ i'[o,dbE Print "found detector array at node " & detnode gPo3jw o$ j9V*f
HK srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 R-L*N$@! jkzC^aG Print "found differential detector area at node " & srcnode `t@Rh~B %\ifnIQ GetTrimVolume detnode, trm MJ=(rp=YU9 detx = trm.xSemiApe 7$z]oVbO' dety = trm.ySemiApe p41TSALq area = 4 * detx * dety )A@i2I Print "detector array semiaperture dimensions are " & detx & " by " & dety ODggGB` H` Print "sampling is " & nx & " by " & ny ^an3& O&]P
u5 'reset differential detector area dimensions to be consistent with sampling }i)^?@ pixelx = 2 * detx / nx qs["&\@ pixely = 2 * dety / ny F2B9Q_>P SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False @@?P\jv~ Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 G2 (jV_L1D 'reset the source power uxxS."~ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) rZ|!y ~S| Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" )kBN]>&R l"C)Ia&/ 'zero out irradiance array &
V*_\ For i = 0 To ny - 1 ?3I93Bt7 For j = 0 To nx - 1 y<Z-f. irrad(i,j) = 0.0 7sC8|+ Next j shn{]Y Next i l6[0i z_A:MoYfo 'main loop A9?h*/$ EnableTextPrinting( False ) I3#h ;;*'<\lP.j ypos = dety + pixely / 2 +&U{>?.u For i = 0 To ny - 1 ,h#U<CnP# xpos = -detx - pixelx / 2 f&n6;N ypos = ypos - pixely b<1k$0J6 T%opkyP>= EnableTextPrinting( True ) b8>2Y'X Print i 5bfd8C EnableTextPrinting( False ) uoryxKRjc~ OYj4G?c VSxls For j = 0 To nx - 1 2I!L+j_ Tej&1'G xpos = xpos + pixelx 6F@2:]W Q9[$8 'shift source k=7+JI"J LockOperationUpdates srcnode, True kW
7$ GetOperation srcnode, 1, op 1]yjhw9g op.val1 = xpos 3RW3<n op.val2 = ypos "I7 Sed7 SetOperation srcnode, 1, op ftw@ nQNU LockOperationUpdates srcnode, False XW^Sw;[efZ x+X^K_* 'raytrace ",pN.<F9O DeleteRays `X =2Ff CreateSource srcnode .Lvg
$d TraceExisting 'draw 3hPj;-u AzfYw'^&9 'radiometry ~@v<B
I For k = 0 To GetEntityCount()-1 MgP6ki1z If IsSurface( k ) Then u`Sg' ro temp = AuxDataGetData( k, "temperature" ) OE"r=is emiss = AuxDataGetData( k, "emissivity" ) !Q0aKkMfL If ( temp <> 0 And emiss <> 0 ) Then _F"o0K!u ProjSolidAngleByPi = GetSurfIncidentPower( k ) Yw\7` frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 0VA$
Ige irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi z1WF@Ej End If Z,? T`[4B RyJN=;5p End If s-z*Lq* S>'S4MJE` Next k ?9?eA^X% R24ZjbKL Next j =Y0>b4 >`@c9
m Next i S]P80|!| EnableTextPrinting( True ) VgoN=S 6z (eW]p 'write out file 3=SN;cn fullfilepath = CurDir() & "\" & fname X`,]@c%C` Open fullfilepath For Output As #1 x;G~c5 Print #1, "GRID " & nx & " " & ny p-6(>,+E[ Print #1, "1e+308" ]Q%|69H}B Print #1, pixelx & " " & pixely UB4 M=R| Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 T9c=As_EM 9 aE.jpN maxRow = nx - 1 LMV0:\> maxCol = ny - 1 t]j4PNzn For rowNum = 0 To maxRow ' begin loop over rows (constant X) f\Fk+)e@ row = "" -d|VXD5N For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) -9.Rmv#og{ row = row & irrad(colNum,rowNum) & " " ' append column data to row string +Y:L4` Next colNum ' end loop over columns r%QnV0L^ sbZ^BFqp Print #1, row Tt0:rQ. CUS^j Next rowNum ' end loop over rows <Bmqox0 Close #1 frYPC
Irj mp{r$tc Print "File written: " & fullfilepath |H,g}XWMU Print "All done!!" ~[|zf*ZISG End Sub #*g .hL< LB)sk$) 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: pO~VI$7 Rj/9\F3H %o~w 找到Tools工具,点击Open plot files in 3D chart并找到该文件 ice7J2r_ 7\q_^ V<#E!MG 打开后,选择二维平面图: T@GR Tg qlUw;{;p
QQ:2987619807 R/yOy^<
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