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摘要: {HHc}8 < j^8L^ 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。 <'f+nC=2 VG'M=O{)3 背景: 'GcN9D 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。 hV_bm@f/y 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。 yy8h8{=g 图1. RPC Photonics工程漫射体结构及光束投射形状 P
:zZ [z=KHk L;6L@D6 步骤 5FKb7 SHWD@WLE4 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。 YBF|0A{[Y -*HR0:H 图2. RPC Photonics工程漫射体不同类型的散射数据 j
S~Wcu 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) d.>Zn?u4L 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 Mwm9{1{ 例如下所示:
$I}7EI Sample name: EDF-C1-56 @M=xdZNyJ Merging data from file EDF-C1-56 0-0.txt 4Cm+xAXG Finished merging RPC data for sample EDF-C1-56 ;tg9$P<85 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt $^~dqmE2, 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,%Sf,h?"^ a. 创建一个新的散射库 J?DJA2o b. 散射模型命名 , !0-;H.Y c. 改变散射模型为“Tabulated BSDF”. !Z(3dtUy d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) xQ~}9Kt\ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 [ H|ifi f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, BeFCt; g. 点击OK 'qoDFR\v 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 M4rI]^lJ _e4%<!1 s&.VU|=VQ@ 脚本代码: !I)wI~XF)5 %OT} r '#Language "WWB-COM" u]`ur#_ +t[i68,% Option Explicit L JW0UF| MbbKo-7F$ Sub Main Ah#bj8} nI0TvBD
'Cleanup +T!7jC(O
Q ClearOutputWindow() 0vYHx V >oYr=O Print "Merging RPC Photonics BSDF Data Files" mssCnr; SetTextColor(255,0,0) pXPLTGY<R+ Print "Note: Script should be located in the same folder as the BSDF TXT files." crvq]J5 Print "Note: Do not run this script multiple times without deleting the output file between executions." 8r{:di* SetTextColor(0,0,0) /u&{=nU 1[4
2f# 'Current directory of this script (should be the same as the text files being merged) ?hfyQhR Dim cDir As String i(qPD_ cDir = MacroDir$ & "\" D2N<a= # {)KH% 'Array which will be populated with the list of files to be merged QY7Thnp1 Dim fList() As String, curFile As String Rlyx&C8 GetFileList( cDir, fList ) vHmsS\\~9 Z4VNm1qs Print "" (Vz\02,K Print "Files found for merging:" vr2cDk{ For Each curFile In fList B QxU~s Print Chr(9) & curFile E!rgR5Bd Next <<vT"2Q] G_1`NyI 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. z\g6E/ %% Dim nameArray() As String, sampName As String f5tkv<) % nameArray = Split(fList(0)," 0-0.txt") .S{>?2 sampName = nameArray(0) ]:g;S,{ Print "" Ew, 1*WK! Print "Sample name: " & Chr(9) & sampName rb_FBa% 0YsBAfRG 'Open an output file and write the FRED header data yH<a;@C Dim outFile As String rfH'&k outFile = cDir & sampName & "_FRED.txt" g#}a?kTM@ Open outFile For Output As #1 kklM"Av Print #1, "type bsdf_data" /\-iV)h1@ Print #1, "format angles=deg bsdf=value scale=1" ;)7 GdR^K V7}3H2]^ 'Loop the file list, skip the two header lines and write the remaining data to file ~E^lKe Dim lineArray() As String, curLine As Long ;}W-9=81 For Each curFile In fList 5,~Ju>y* Print "Merging data from file " & curFile D-KQRe2@ ReadFile( cDir & curFile, lineArray ) _$vAitUe4S For curLine = 2 To UBound(lineArray) 'n$TJp|s Print #1, lineArray(curLine) Tm) (?y Next rEfo)jod Next oU[>.Igi ZIr&_x#e 'Close the output file TQ`4dVaf Close #1 vj#Y /B FG@ ')N!g Print "Finished merging RPC data for sample " & sampName ,z@"pI
b Print "FRED formatted data file: " & Chr(9) & outFile l =`?Im End Sub bsosva+ 9snc
*< 'Utility function to read the contents of a file into an array of strings. lKT<aYX Function ReadFile(ByVal fileName As String, _ u|eV'-R)s ByRef lineArray() As String) As Long [OU[i(,{ rAwuWM@BIg ReadFile = -1 !ma%Zk Dim oFSO As Object jMUN|(=Y Set oFSO = CreateObject("Scripting.FileSystemObject") Tj3xK%K_r3 Erase lineArray G\4*6iw: , b;WCWm Dim fid As Long L5{DWm~@ If oFSO.fileexists( fileName ) Then xZc].l6 fid = FreeFile() UZD Xv=r| Open fileName For Input As fid e{RhMjX<D lineArray = Split(Input(LOF(fid), fid), vbCrLf) .KeZZLH Close fid xC}9W6 End If f8JWg9m Set oFSO = Nothing 8G<{L0J%! Return UBound( lineArray ) JIH6! HA# 9y;\ End Function S?BI)shmg Yb?L:,a(I Sub GetFileList( ByVal in_dir As String, _ *rH#k? ByRef in_flist() As String ) e0&x?U*/ :41Ch^\E 'Redimension the file list array b>]MZhLJe Erase in_flist <>?7veN92 2}<_l 2 'Tracks how many files are found H7Y :l0b Dim fCount As Long \:Vm7Zg fCount = 0 _GF{Duxh cy{ ado2 'Recurse directory and search for text files P+2@,?9# Dim f As String
)/mBq#ZS f = Dir$(in_dir & "*.txt") tH^]`6"QUa While f <> "" 15dbM/Gj ReDim Preserve in_flist(fCount) k[<Uxh% in_flist(fCount) = f -Ed<Kl fCount += 1 2T&n6t$p f = Dir$() S(
Vssi|y Wend SpJIEw ReDim Preserve in_flist(fCount-1) 8%Eemk >G{ Zv|TvlyT" End Sub Tk~Y u!@(u!Qz 5SQqE@g% QQ:2987619807 3z~d7J
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