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摘要: k|)fl l )JS6W 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。 tVn?cS p'
>i3T( 背景: q;'f3Y 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。 W r/-{Wt 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。 rz "$zc.) 图1. RPC Photonics工程漫射体结构及光束投射形状 >Wr%usNxc zi-_ l
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FU 步骤 C27:tyV 92DM1~
* 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 +x"uP ]P?<2, 图2. RPC Photonics工程漫射体不同类型的散射数据 s/D)X=P1 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) q?(]
Y* 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 F^O83[S 例如下所示: ~gfR1SE Sample name: EDF-C1-56 D!&(#Vl
_ Merging data from file EDF-C1-56 0-0.txt ]Btkoad Finished merging RPC data for sample EDF-C1-56 KMRPleF FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt sasurR|; 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 |u&cN-}C d a. 创建一个新的散射库 NHGTV$T`1 b. 散射模型命名 L|'^P3#7` c. 改变散射模型为“Tabulated BSDF”. V"4Z9Qg} 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 ) Vx_33";S\ 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。 [C "\]LiX 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, UPh#YV 0/, g. 点击OK K!-OUm5A 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 <gp?}Lk VPUVPq~& .;?!I_` 脚本代码: xl\Kj2^ /v R>.' '#Language "WWB-COM" 0*$w(* ":Dm/g Option Explicit ,>
zEG 3 t,_{9 Sub Main 8-2`S* Y9+_MxC" 'Cleanup /'/I^ab ClearOutputWindow() -R`{]7V XIW0Z C Print "Merging RPC Photonics BSDF Data Files" .hl_zc# SetTextColor(255,0,0) vi,hWz8WB Print "Note: Script should be located in the same folder as the BSDF TXT files." P\jGySj Print "Note: Do not run this script multiple times without deleting the output file between executions." I~GF%$-G SetTextColor(0,0,0) ZwmucY%3 <S@jf4 'Current directory of this script (should be the same as the text files being merged) Wc3z7xK1@ Dim cDir As String ;5Sdx5`_ cDir = MacroDir$ & "\" ?{ir$M (
ayAP 'Array which will be populated with the list of files to be merged jJ,_-ui Dim fList() As String, curFile As String fO*jCl GetFileList( cDir, fList ) S#/%#k103 `AJ[g>py^| Print "" U.7fMc# Print "Files found for merging:" *DL7p8 For Each curFile In fList lE:g A, Print Chr(9) & curFile I.<c{4K5 Next ~6 6xO9s 4<efj 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. )kD/ 8 Dim nameArray() As String, sampName As String #z `W ,^C nameArray = Split(fList(0)," 0-0.txt") t^rw@$"} sampName = nameArray(0) ?"B]"%M& Print "" F!omkN Print "Sample name: " & Chr(9) & sampName !|cg= ~Z\:Nx 'Open an output file and write the FRED header data uDF;_bli)H Dim outFile As String FcDS*ZEk! outFile = cDir & sampName & "_FRED.txt" \(o"/* Open outFile For Output As #1 9njwAKF? Print #1, "type bsdf_data" kx"10Vw Print #1, "format angles=deg bsdf=value scale=1" YDt+1Kw}D )#=J<OpG 'Loop the file list, skip the two header lines and write the remaining data to file ?e7]U*jEU Dim lineArray() As String, curLine As Long ^t;z;.g For Each curFile In fList r~4uIUE{ Print "Merging data from file " & curFile J$dwy$n ReadFile( cDir & curFile, lineArray ) yK~=6^M For curLine = 2 To UBound(lineArray) [M?2axOC Print #1, lineArray(curLine) p9(y b Next 4fEDg{T Next $XBK_ 5 ._mep\#.: 'Close the output file +X}i%F' Close #1 GIC1]y-' u;#]eUk9} Print "Finished merging RPC data for sample " & sampName 'D\Q$q Print "FRED formatted data file: " & Chr(9) & outFile mgs(n5V5 End Sub JxAQ,oOO K=g</@L6R 'Utility function to read the contents of a file into an array of strings. ()3\(d5e Function ReadFile(ByVal fileName As String, _ #(8|9 ByRef lineArray() As String) As Long bDI%}k9# 7N.b-}$( ReadFile = -1 d=!:UB Dim oFSO As Object ?1e{\XW Set oFSO = CreateObject("Scripting.FileSystemObject") QLA.;`HIE Erase lineArray c8RJOc4X JKfG/z| Dim fid As Long O] _4pP If oFSO.fileexists( fileName ) Then M `xiC fid = FreeFile() eL!41_QI Open fileName For Input As fid !40>LpL[ lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~E<2gMKjO Close fid s\ IKSoE End If nla6QlFYn* Set oFSO = Nothing e~'`x38 Return UBound( lineArray ) 2z.ot' gL; Kie6Z End Function ZzT=m*tQ& 0c_xPBbB+ Sub GetFileList( ByVal in_dir As String, _
:|7#D,2 ByRef in_flist() As String ) eRauyL"Q+ r-2k<#^r 'Redimension the file list array d|`Ll Erase in_flist zmMc*| V7ph^^sC} 'Tracks how many files are found Uv^\[ Dim fCount As Long YFKE>+ fCount = 0 Fe+
@; 'j1e(wq 'Recurse directory and search for text files hy;VvAH5 Dim f As String oFY!NMq}: f = Dir$(in_dir & "*.txt") tF2"IP. While f <> "" hbjAxioA ReDim Preserve in_flist(fCount) c/{FDN in_flist(fCount) = f 9g9 2eKS fCount += 1 1^iBS f = Dir$() *O?c~UJhhV Wend )P$(]{ ReDim Preserve in_flist(fCount-1) `i7r] (FuIOR End Sub $YYWpeW
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