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摘要: ,"v)vTt '@3a,pl 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。 N,'[:{GOY 0jip::x 背景: vTe$77n Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 .=et{\ FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 B.C H9M 图1. RPC Photonics工程漫射体结构及光束投射形状 |wyJh"4!
UH1S_:6 /ej/&x15 步骤 V PLCic,T .O@q5G 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 gKm@B{rC YiY&;)w 图2. RPC Photonics工程漫射体不同类型的散射数据 =+SVzK,+3 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) O,V6hU/ * 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 GDNh?R 例如下所示: a
V+o\fId Sample name: EDF-C1-56 S1x.pLHj8 Merging data from file EDF-C1-56 0-0.txt B~'VDOG$Z Finished merging RPC data for sample EDF-C1-56 Jm*M7gj FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ,&zjOc_v 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 r=iMo7q a. 创建一个新的散射库 `K@df<}%*, b. 散射模型命名 ib""Fv7{ c. 改变散射模型为“Tabulated BSDF”. e!2%k u 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 ) mV!
@oNCK 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。 -KU)7V 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, 08d_DCR g. 点击OK }?Yr>ZRi 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 7KSGG1ts foP>w4pB )68fm\t( 脚本代码: DESViQM vwqN;|F '#Language "WWB-COM" +=B}R h^ecn-PC Option Explicit _w5~/PbWt ,GXfy9x7U Sub Main /qz "I-a Jq+$_Uqd 'Cleanup #@\NdW\ ClearOutputWindow() XnI
;7J x[O#(^q Print "Merging RPC Photonics BSDF Data Files" ?3"D|
cS1 SetTextColor(255,0,0) BHJ'[{U*w Print "Note: Script should be located in the same folder as the BSDF TXT files." mJDKxgGK Print "Note: Do not run this script multiple times without deleting the output file between executions." fj
t_9-. SetTextColor(0,0,0) AZ9\>U@hD ^ yukn*L 'Current directory of this script (should be the same as the text files being merged) b]g&rwXYt Dim cDir As String _AFt6\ cDir = MacroDir$ & "\" Ignv|TYG mTuB* 'Array which will be populated with the list of files to be merged N>nvt.`P Dim fList() As String, curFile As String Dy{`">a GetFileList( cDir, fList ) Uh|__DUkh kFIB lPV Print "" vb"dX0)< Print "Files found for merging:" va/4q+1GfH For Each curFile In fList I\uB"Z{9 Print Chr(9) & curFile )Y,?r[4{ Next `2mbF^-4 3Llj_lf 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. R$;&O.
5M Dim nameArray() As String, sampName As String -IEP?NX nameArray = Split(fList(0)," 0-0.txt") P7k$^n sampName = nameArray(0) ,8"[ /@ Print "" 2eR+dT Print "Sample name: " & Chr(9) & sampName "O*W]e ~~:8Yv[( 'Open an output file and write the FRED header data ;Y|~!%2~ Dim outFile As String }
@fu~V/ outFile = cDir & sampName & "_FRED.txt" PSQ:' Open outFile For Output As #1 7" STS7_ Print #1, "type bsdf_data" FvNSu"O~K1 Print #1, "format angles=deg bsdf=value scale=1" R5;eR(24G JTh=JHJ 'Loop the file list, skip the two header lines and write the remaining data to file 3
cW"VrFy9 Dim lineArray() As String, curLine As Long +-!|%jG`%v For Each curFile In fList ?6YUb; Print "Merging data from file " & curFile vB YT)S ReadFile( cDir & curFile, lineArray ) B?ob{K@ For curLine = 2 To UBound(lineArray) 'GzhZ`E6 Print #1, lineArray(curLine) 7fTg97eF Next "QFADk1 Next 6p=x gk-q ^RyTK|SQ 'Close the output file /e?ux ~f| Close #1 9H%xZ(`vN ?M-8Fp3 + Print "Finished merging RPC data for sample " & sampName O9=H
[b Print "FRED formatted data file: " & Chr(9) & outFile 4Z~Dxo End Sub b
G5 7C?mD75j 'Utility function to read the contents of a file into an array of strings. 2[&-y[1 Function ReadFile(ByVal fileName As String, _ ^}7t: ByRef lineArray() As String) As Long U4L=3T+:[ lvJ{=~u ReadFile = -1 ftU5A@(T Dim oFSO As Object %PdYv _5 Set oFSO = CreateObject("Scripting.FileSystemObject") r\ Yur Erase lineArray f uNXY-; $z,DcO.vz Dim fid As Long Ru')X{]25 If oFSO.fileexists( fileName ) Then <IDzv' fid = FreeFile() v_h*:c Open fileName For Input As fid Heif FJn lineArray = Split(Input(LOF(fid), fid), vbCrLf) k\<Ln
w Close fid wVJFA1 End If eL?si!ZL^ Set oFSO = Nothing qq_,"~ Return UBound( lineArray ) \Y[)bo6s Hpg;?xAT End Function Y <k,E :@Dos'0Px Sub GetFileList( ByVal in_dir As String, _ RZh)0S>J ByRef in_flist() As String ) N_Ld,J%g [=F
|^KL 'Redimension the file list array "s<lLgi Erase in_flist v!h-h&p O7 Hf{%N'4 'Tracks how many files are found &p4<@k\L Dim fCount As Long KmOa^vY1.T fCount = 0 5t?2B] V"jnrNs3 'Recurse directory and search for text files B]F7t4Y! Dim f As String l4reG:uYG f = Dir$(in_dir & "*.txt") R./ 6Q1 While f <> "" Byj~\QMD| ReDim Preserve in_flist(fCount) kD7(}N8YR in_flist(fCount) = f &E`Z_}~ fCount += 1 Hll}8d6[ f = Dir$() &*GX:0=/> Wend X )s7_ ReDim Preserve in_flist(fCount-1) \o)4m[oF s;WCz End Sub 2vQ^519 dKTAc":-} 9,eR=M]+: QQ:2987619807 \U>Kn_7m
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