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infotek 2020-11-18 10:58

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。 A a2*f[  
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成像示意图
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首先我们建立十字元件命名为Target KJa?TwnC  
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创建方法: DA oOs}D  
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面1 : D PnKr/  
面型:plane JF*JF Ob  
材料:Air `h M:U  
孔径:X=1.5, Y=6,Z=0.075,形状选择Box k=[!{I  
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辅助数据: I}Z[F,}*J  
首先在第一行输入temperature :300K, Z*kGWL  
emissivity:0.1; l;L&ijTQD  
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面2 : w\Q3h`.  
面型:plane DR9M8E  
材料:Air 3V`K^X3  
孔径:X=1.5, Y=6,Z=0.075,形状选择Box 9AJ!7J#v"  
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位置坐标:绕Z轴旋转90度, t4?g_$>   
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辅助数据: o lNL|WJ`w  
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首先在第一行输入temperature :300K,emissivity: 0.1; Ul[>LKFY  
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Target 元件距离坐标原点-161mm; N|Ua|^  
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单透镜参数设定:F=100, bend=0, 位置位于坐标原点 7& k lX  
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探测器参数设定: yQhrPw> m  
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在菜单栏中选择Create/Element Primitive /plane P1 (8foZA  
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元件半径为20mm*20,mm,距离坐标原点200mm。 dWD,iO_"@  
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光源创建: ACl:~7;  
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光源类型选择为任意平面,光源半角设定为15度。 WGG|d)'@  
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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。 #jr;.;8sQ  
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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。 qvYYKu  
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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。 l,*Q?q  
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创建分析面: $'9r=#EH  
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到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 dhK$ XG  
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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。 #yr19i ?  
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FRED在探测器上穿过多个像素点迭代来创建热图 FbFUZ^Zj  
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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。 Q(]-\L'  
将如下的代码放置在树形文件夹 Embedded Scripts, ,C&h~uRi#f  
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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。 '12|:t&7  
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绿色字体为说明文字, 0BaL!^>  
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'#Language "WWB-COM" M8cLh!!  
'script for calculating thermal image map _hh|/4(  
'edited rnp 4 november 2005 n+Ag |.,|  
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'declarations $d8A_CUU  
Dim op As T_OPERATION RTY$oUqlZ  
Dim trm As T_TRIMVOLUME cC}s5`  
Dim irrad(32,32) As Double 'make consistent with sampling uhc0,V;S  
Dim temp As Double r]HLO'<]  
Dim emiss As Double ]LSa(7>EU  
Dim fname As String, fullfilepath As String Cg{$$&_(Hj  
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'Option Explicit Uw&+zJ  
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Sub Main GU[ Cq=k  
    'USER INPUTS p\-.DRwT`  
    nx = 31 #[KwR\b{:+  
    ny = 31 vQ_B2#U:  
    numRays = 1000 .9^;? Ts  
    minWave = 7    'microns $s]@%6 f  
    maxWave = 11   'microns 4l$8lYi  
    sigma = 5.67e-14 'watts/mm^2/deg k^4 w x,;  
    fname = "teapotimage.dat" O4E2)N  
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    Print "" w`7l ;7[  
    Print "THERMAL IMAGE CALCULATION" T=R94  
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    detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 ;XtDz  
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    Print "found detector array at node " & detnode Z^~ 6pH\  
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    srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ffB]4  
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    Print "found differential detector area at node " & srcnode _:K}DU'6  
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    GetTrimVolume detnode, trm g8x8u|  
    detx = trm.xSemiApe _$cBI_eA7  
    dety = trm.ySemiApe _ x'StD  
    area = 4 * detx * dety 8/F2V?iT  
    Print "detector array semiaperture dimensions are " & detx & " by " & dety 5Y&@ :Y  
    Print "sampling is " & nx & " by " & ny ^7''x,I  
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    'reset differential detector area dimensions to be consistent with sampling uB^]5sqfk  
    pixelx = 2 * detx / nx 3AL.UBj&}  
    pixely = 2 * dety / ny .^NV e40O  
    SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False jF5JpyOc  
    Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 .Lp-'!i  
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    'reset the source power <qy+@t  
    SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) :_H88/?RR  
    Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" .o8Gi*PEY  
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    'zero out irradiance array s6]f#s5o  
    For i = 0 To ny - 1 G`P+J  
        For j = 0 To nx - 1 >mV""?r]  
            irrad(i,j) = 0.0 Iymz2  
        Next j #Nd+X@j  
    Next i Rq9gtx8,=  
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    'main loop pqr" x2=.  
    EnableTextPrinting( False ) #.='dSj  
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    ypos =  dety + pixely / 2 2uHp%fv;  
    For i = 0 To ny - 1 pZjFpd|  
        xpos = -detx - pixelx / 2 zN:752d^+r  
        ypos = ypos - pixely X<{m;T `  
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        EnableTextPrinting( True ) *k}d@j,*"  
        Print i 4jW{IGW  
        EnableTextPrinting( False ) IviWS84  
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        For j = 0 To nx - 1 ;1 fML,8  
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            xpos = xpos + pixelx %'HUC>ChN  
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            'shift source qSd $$L^  
            LockOperationUpdates srcnode, True ^PI49iB  
            GetOperation srcnode, 1, op ]3C8  
            op.val1 = xpos GM/1u fZH  
            op.val2 = ypos |3L MVN  
            SetOperation srcnode, 1, op ]*|K8&jxl  
            LockOperationUpdates srcnode, False c>SeOnf  
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            'raytrace k.ZfjX"  
            DeleteRays Xwi&uyvU&  
            CreateSource srcnode  #L)rz u  
            TraceExisting 'draw Z7^}G=*  
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            'radiometry ?zEF?LJoK  
            For k = 0 To GetEntityCount()-1 SXEiyy[7v  
                If IsSurface( k ) Then 7E95"B&w  
                    temp = AuxDataGetData( k, "temperature" ) NP8TF*5V  
                    emiss = AuxDataGetData( k, "emissivity" ) PwW@I~@>  
                    If ( temp <> 0 And emiss <> 0 ) Then )R4<* /C:w  
                        ProjSolidAngleByPi = GetSurfIncidentPower( k ) J (h>  
                        frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) vF&b|V+,  
                        irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi BR2y1Hfi  
                    End If K5SO($  
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                End If g8Z14'Ke  
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            Next k w%;'uN_  
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        Next j (4LLTf0  
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    Next i eXK`%'  
    EnableTextPrinting( True ) ?=kswf  
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    'write out file 7&4,',0VL  
    fullfilepath = CurDir() & "\" & fname 3U)8P6Fz  
    Open fullfilepath For Output As #1 (Y([^N q  
    Print #1, "GRID " & nx & " " & ny I8?[@kg5b'  
    Print #1, "1e+308" O 0#Jl8  
    Print #1, pixelx & " " & pixely pC-OZ0  
    Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 zwtsw[.  
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    maxRow = nx - 1 3;NRW+  
    maxCol = ny - 1 Q8?D}h  
    For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) W#j,{&KVn  
            row = "" +`8)U3u0  
        For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) "zbE  
            row = row & irrad(colNum,rowNum) & " "     ' append column data to row string l #Q`f.  
        Next colNum                     ' end loop over columns P~e$iBH'  
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            Print #1, row s~ A8/YoU}  
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    Next rowNum                         ' end loop over rows dn_OfK  
    Close #1 :N*T2mP  
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    Print "File written: " & fullfilepath  c^s>  
    Print "All done!!" yipD5,TC  
End Sub @88i/ Z_  
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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: f)Q]{cb6  
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找到Tools工具,点击Open plot files in 3D chart并找到该文件 T+RI8.#o  
  
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打开后,选择二维平面图: !" %sp6Wc  
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查看本帖完整版本: [-- 十字元件热成像分析 --] [-- top --]

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