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摘要: wn>?r
?KIB '_M"yg6d RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 K1|xatx1V !-|{B3"6 背景: >~* w Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 I#:4H2H6 FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ,a@jg&Mb] 图1. RPC Photonics工程漫射体结构及光束投射形状 $mDlS w;DRC5V> =8 Jq'-da 步骤 MryY<s OR-fC 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 FP h1 }qS 9d >AnTf&H 图2. RPC Photonics工程漫射体不同类型的散射数据 ^U{SUWl 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) <.c#l': 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 GPU,.s"&( 例如下所示: y/6%'56uF Sample name: EDF-C1-56 ood,k{ Merging data from file EDF-C1-56 0-0.txt b#{[Pk,w9 Finished merging RPC data for sample EDF-C1-56 Q$=X
?{ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt -x0u}I 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 aiwKkf`\ a. 创建一个新的散射库 L3^+`e b. 散射模型命名 @xPWR=Lb c. 改变散射模型为“Tabulated BSDF”. HF]|>1WV[ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) /UPe@ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ^q)s f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, V.kRV{43 g. 点击OK o"e]9{+< 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 _(J/$D ^Y+P(o$HM %Ig3udcY? 脚本代码: +OX:T) 4h6 ;UDd4@3`S" '#Language "WWB-COM" u(g0Ob Ga#5xAI{a Option Explicit _|vY)4B4U QwgP+ M+ Sub Main n0%]dKCB gOKF%Ej31T 'Cleanup )l"py9STF ClearOutputWindow() w>Y!5RnO Jde@Th Print "Merging RPC Photonics BSDF Data Files" A1V^Gi@i SetTextColor(255,0,0) }2~$"L,_ Print "Note: Script should be located in the same folder as the BSDF TXT files." ]Geg;[t Print "Note: Do not run this script multiple times without deleting the output file between executions." FJ(}@U}57 SetTextColor(0,0,0) k_hs g6Ur. Dt\rMSjZ9 'Current directory of this script (should be the same as the text files being merged) U%E364;F Dim cDir As String YVS~|4hu?i cDir = MacroDir$ & "\" Ym5ji$!2 QO(P_az3mg 'Array which will be populated with the list of files to be merged }D\i1/Y Dim fList() As String, curFile As String Bi$nYV)-l GetFileList( cDir, fList ) 55#s/`gd)^ &d/x1= Print "" T?V!%AqY: Print "Files found for merging:" Rt2<F-gY For Each curFile In fList "`&1"* Print Chr(9) & curFile :o+&>z Next @fO[{V EQ>] ~
'Split the first text file name found to get the sample name. First file should be 0-0 measurement. U>=&
2Z2? Dim nameArray() As String, sampName As String F>/"If# nameArray = Split(fList(0)," 0-0.txt") lD\vq 2 sampName = nameArray(0) ud,=O Xq Print "" EX9os Print "Sample name: " & Chr(9) & sampName 0s'H(qE,_ @Rp#*{ 'Open an output file and write the FRED header data /7[X_)OG Dim outFile As String 5T- N\)@ outFile = cDir & sampName & "_FRED.txt" hk.Zn.6A' Open outFile For Output As #1 &yN/AY`U Print #1, "type bsdf_data" -N~eb^3[c Print #1, "format angles=deg bsdf=value scale=1" 95%QF;h Vp
j[)W%L 'Loop the file list, skip the two header lines and write the remaining data to file 8ZPjzN>c6 Dim lineArray() As String, curLine As Long ;;? Zd For Each curFile In fList G~N$bF^R) Print "Merging data from file " & curFile 1DT}_0{0Q ReadFile( cDir & curFile, lineArray ) =!{
E!3>*D For curLine = 2 To UBound(lineArray) |VxO ,[~ Print #1, lineArray(curLine) 9qXKHro Next LOf)D7T Next (D1$ & $++SF)G1]_ 'Close the output file NT&skrzW Close #1 %e|.a)78 >hsvRX\_` Print "Finished merging RPC data for sample " & sampName dD.;P=AP Print "FRED formatted data file: " & Chr(9) & outFile aq-R#q End Sub g\q*,1
U,2H) {l/ 'Utility function to read the contents of a file into an array of strings. Lx#CFrLQ* Function ReadFile(ByVal fileName As String, _ T(2*P5%& ByRef lineArray() As String) As Long '&42E[0P Bq4^nDK ReadFile = -1 #9FY;~ Dim oFSO As Object 7ts`uI<E@7 Set oFSO = CreateObject("Scripting.FileSystemObject") Kdr7JQYzuz Erase lineArray wi$,Y.: |fhYft Dim fid As Long W34_@,GD If oFSO.fileexists( fileName ) Then `_Fxb@"R fid = FreeFile() h}SP` Open fileName For Input As fid x}B_;&>&"_ lineArray = Split(Input(LOF(fid), fid), vbCrLf) MQvk&
AX Close fid uXkc07 r' End If nXFPoR)T Set oFSO = Nothing a7YzX5n Return UBound( lineArray ) 6<qVeO&uZ sm9/sX! End Function 5vo5t0^o $-ICTp Sub GetFileList( ByVal in_dir As String, _ `m7w%J.> n ByRef in_flist() As String ) )g
; !IL odaCKhdk 'Redimension the file list array i4s_:%+ Erase in_flist Is1(]^EE* FBGe s[, 'Tracks how many files are found SQ0?M\D7 Dim fCount As Long EPu-oE=HW4 fCount = 0 7+;$_,Xo< jhF&
'Recurse directory and search for text files K2
b\9} Dim f As String xixdv{M<FF f = Dir$(in_dir & "*.txt") )p!.V(, While f <> "" 3[;fO_ R ReDim Preserve in_flist(fCount) Kd;Iu\4hv in_flist(fCount) = f yhG%@vSq fCount += 1 ]21`x f = Dir$() lV
M)'m Wend V AnP3: ReDim Preserve in_flist(fCount-1) ^sqTgrG o>i@2_r\&H End Sub unD.t *-\qO.4\ >O$JS, QQ:2987619807 3]wV 1<K
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