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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。 4V,.Oi (@1:1K( 成像示意图 h|qJ{tUWc$ 首先我们建立十字元件命名为Target YT\@fgBt ]\78(_o.zz 创建方法: _Iy\,< B
71/nt9 面1 : tEhg',2t( 面型:plane `%C -7D'? 材料:Air ||$&o!;/L 孔径:X=1.5, Y=6,Z=0.075,形状选择Box K;?D^n. ux; ?WPyr P$)g=/td1 辅助数据: ^ Bx[% 首先在第一行输入temperature :300K, $T'!??|IF emissivity:0.1; QU).q65p d#ir=+o{h g68p9#G 面2 : nr!N%Hi 面型:plane Ed9Uw7 材料:Air "s+4!, k 孔径:X=1.5, Y=6,Z=0.075,形状选择Box v4P"|vZ$& JB_fS/I >Fel) a 位置坐标:绕Z轴旋转90度, #z `W ,^C t^rw@$"} ?"B]"%M& 辅助数据: F!omkN !|cg= 首先在第一行输入temperature :300K,emissivity: 0.1; + ?1GscJ )g0fN+Mb FcDS*ZEk! Target 元件距离坐标原点-161mm; \(o"/* G=zWhqieh Z~5) )5Ye; 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 hx;f/EPx *IG$"nu #~ u0R>= 探测器参数设定: 8K 3dwoT
aB9!}3@ 在菜单栏中选择Create/Element Primitive /plane MY&Jdmga yK~=6^M [M?2axOC p9(y b tXD$HeBB? $XBK_ 5 元件半径为20mm*20,mm,距离坐标原点200mm。 ._mep\#.: C*7/iRe 光源创建: L4#pMc 2eT?qCxqc 光源类型选择为任意平面,光源半角设定为15度。 \8`?ir
q" {$*N1$(% E~'mxx~i 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 xO~ElzGm I2cz:U7 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 @mp`C}x"0& A'WR!*Yt ?pDr"XH~ 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 [K!9xM6 <n"BPXF~ 创建分析面: [6/QUD8 o4(*nz cr7MvXF- 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 XYE|=Tr] %u -x9 e#eVc'=cDR 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 EE/mxN(< ; *
[:~5Wc FRED在探测器上穿过多个像素点迭代来创建热图 o5<<vvdA l'@-?p(Vuw FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 k;WD[SV 将如下的代码放置在树形文件夹 Embedded Scripts, GK(CuwJe P&-o>mM 92+8zX 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 DSGcxM+ Xlo7enzY 绿色字体为说明文字, nQ%HtXt; JTlk[c '#Language "WWB-COM" =W(*0"RM 'script for calculating thermal image map <=uYfi 3, 'edited rnp 4 november 2005 ab0Sx lWbu`y 'declarations q2GW3t Dim op As T_OPERATION FhE{khc# Dim trm As T_TRIMVOLUME &y[NCAeA Dim irrad(32,32) As Double 'make consistent with sampling xo:kT ) Dim temp As Double x 3@-E Dim emiss As Double f)I5=Ijy( Dim fname As String, fullfilepath As String E+td~&x k3\N.@\ 'Option Explicit N^^0j, #cbgp;,M{I Sub Main ZedFhm 'USER INPUTS ^5mc$~1` nx = 31 rS8a/d~;0 ny = 31 /
)0hsQs numRays = 1000 k[=qx{Osx% minWave = 7 'microns 8~=*\
@^ maxWave = 11 'microns c:R?da sigma = 5.67e-14 'watts/mm^2/deg k^4 XtF
m5\U fname = "teapotimage.dat" lame/B&nc U"oNJ8&%| Print "" @hLkU4S Print "THERMAL IMAGE CALCULATION" YJi%vQ*] }D/+YG detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 jDzQw>TX voWH.[n^_ Print "found detector array at node " & detnode "kg`TJf= #-hO\
QdC srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 nHK(3Z4G Qm%F]nyy Print "found differential detector area at node " & srcnode H=dIZ @Z)|_ GetTrimVolume detnode, trm u\R?(G& detx = trm.xSemiApe ^xo<$zn dety = trm.ySemiApe Bx\&7|,x area = 4 * detx * dety 5*0zI\ Print "detector array semiaperture dimensions are " & detx & " by " & dety ,'#TdLe Print "sampling is " & nx & " by " & ny qsj{0 Go m 2H4V+M+ 'reset differential detector area dimensions to be consistent with sampling qTO6I5u pixelx = 2 * detx / nx k.T=&0J_1 pixely = 2 * dety / ny ul{x|R SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False _vQ52H, Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ZbnAAbfKH qY_qS=H^ 'reset the source power J0G@]H SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) TS<d?: Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" j0=6B y@P%t9l 'zero out irradiance array +X?ErQm For i = 0 To ny - 1 igO>)XbsM For j = 0 To nx - 1 9>}&dQ8 irrad(i,j) = 0.0 x`CjFaE~F Next j |Q?h"5i"( Next i ]5Cr$%H= :uL<UD,vu3 'main loop
J~~\0 u EnableTextPrinting( False ) 'C+cQLig@ +ikSa8)*i ypos = dety + pixely / 2 ?HEqv$n For i = 0 To ny - 1 $ {yct xpos = -detx - pixelx / 2 fHt \KP ypos = ypos - pixely >7U/TVd& }$6L]
EnableTextPrinting( True ) }\4yU=JPK Print i 3i^X9[. EnableTextPrinting( False ) >CB-a : 6F\ 6,E }~FX!F#oU For j = 0 To nx - 1 M!&Hn,22 ]4:QqdV xpos = xpos + pixelx tr<~:&H4T fI.|QD*$b 'shift source rYUIFPN LockOperationUpdates srcnode, True p_$^keOL GetOperation srcnode, 1, op 1\hLwG6Jj op.val1 = xpos (m]l -Re op.val2 = ypos /ViY:-8s SetOperation srcnode, 1, op LF|0lAr LockOperationUpdates srcnode, False 4,RPidv%O `[ZswLE raytrace \aSP7DzqQ DeleteRays p1N}2]e CreateSource srcnode [6GYYu\ TraceExisting 'draw /VR~E'Cy% 1M ?BSH{ 'radiometry r. 82RoG?G For k = 0 To GetEntityCount()-1 MU<(O} If IsSurface( k ) Then *V>?m6y/ temp = AuxDataGetData( k, "temperature" ) _!xrBdaJ emiss = AuxDataGetData( k, "emissivity" ) ^WA7X9ed If ( temp <> 0 And emiss <> 0 ) Then @]uqC~a^ ProjSolidAngleByPi = GetSurfIncidentPower( k ) R%r
bysP frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ]#0 ( irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi WjD885Xo End If ;zCUx*{ RpdUR*K9x End If `}X3f#eO& |)x7qy` Next k qxZIH "*vrrY Next j 9a`LrB $6"sR I6u Next i m8n) sw,, EnableTextPrinting( True ) :Cq73:1\B N0 {e7M 'write out file
cILS fullfilepath = CurDir() & "\" & fname +n^M+ea; Open fullfilepath For Output As #1 Gxr\a2Z&r% Print #1, "GRID " & nx & " " & ny |q`NJ Print #1, "1e+308" ~aC ?M& Print #1, pixelx & " " & pixely <kB:`&X<\ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ~yv7[`+Tgg Ai/X*y:[? maxRow = nx - 1 91OxUVd maxCol = ny - 1 y3~=8!Tj?Q For rowNum = 0 To maxRow ' begin loop over rows (constant X) 4m*)("H row = "" )uqzu%T For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) N'{[BA(eE row = row & irrad(colNum,rowNum) & " " ' append column data to row string xHgC':l(0 Next colNum ' end loop over columns -K{R7
<':h/d Print #1, row TzL|{9 :7e*- ' Next rowNum ' end loop over rows ]4aPn Close #1 ^s~)"2 g ^'QO!{7f Print "File written: " & fullfilepath MQ,K%_m8 Print "All done!!" SxF'2ii End Sub _8G
w Mj a4:GGzt 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: M0
z%<_<} W3:j Z: C?qRZB+W# 找到Tools工具,点击Open plot files in 3D chart并找到该文件 ]V"P
&;m i'fw>-0 7FH(C`uKi 打开后,选择二维平面图: [>ghs_?dZ "ESc^28
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