(_T&2% 摘要: V)`?J) s|%</fMt9 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。 2'_sGAH bchhokH 背景: ,rd+ dN 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。 1/m/Iw@ 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。图1. RPC Photonics工程漫射体结构及光束投射形状 h^s}8y 5v3B8 @CsA efhwbn ,]d}pJ}PX` 步骤 mF1oY[xa_ LF0~H}S;6B 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。 K( p1+GHC 图2. RPC Photonics工程漫射体不同类型的散射数据 ,[~EThcq q8oEb 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) ~i
\69q% 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 5Z:HCp-aG 例如下所示: oGM.{\i Sample name: EDF-C1-56 5E@V@kw Merging data from file EDF-C1-56 0-0.txt ofSOy1
Finished merging RPC data for sample EDF-C1-56 >Cf`F{X'U FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt \|(;q+n?k 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +k>v^sz a. 创建一个新的散射库 =4I361oMf b. 散射模型命名 \!PC:+uJ c. 改变散射模型为“Tabulated BSDF”. NOx|
# 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 ) D >mLSh 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。 p|((r?{ 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, K.%E=^~q g. 点击OK 2/~v 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 1$|z%( uODsXi{z t@ Jo ?0s 脚本代码: kO.rgW82 d+^;kse '#Language "WWB-COM" %:y-"m1\u$ eAqQ~)8^ Option Explicit i{8=; &F:7U! Sub Main Rl(b tr1w rYLNV!_ 'Cleanup J+TYm%A;- ClearOutputWindow() HGKm?'[' -or9!:8 Print "Merging RPC Photonics BSDF Data Files" 1a'JNe$ SetTextColor(255,0,0) @@5u{K Print "Note: Script should be located in the same folder as the BSDF TXT files." ?>&8,p17 Print "Note: Do not run this script multiple times without deleting the output file between executions." 4?&=H
*H: SetTextColor(0,0,0) vhg4E80Kr lA1R$ 'Current directory of this script (should be the same as the text files being merged) cmI8Xf]"P- Dim cDir As String JWBWa- cDir = MacroDir$ & "\" j ]P|iL o ).pF">jh 'Array which will be populated with the list of files to be merged R0|X;3 Dim fList() As String, curFile As String zL|^5p`K GetFileList( cDir, fList ) t
_W |` 2c~^|@ Print "" ZN?(lt)u9 Print "Files found for merging:" LU]~d<i99 For Each curFile In fList 936t6K& Print Chr(9) & curFile qg|+BIiUz Next C]`Y PM5 8
jT"HZB6 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. &sRyM'XI Dim nameArray() As String, sampName As String v6rw. nameArray = Split(fList(0)," 0-0.txt") s.~SV" sampName = nameArray(0) {tM D*?C[6 Print "" C{Zv.+F Print "Sample name: " & Chr(9) & sampName 3aOFpCs|# 5x: XXj" 'Open an output file and write the FRED header data *Dn{MD7,M Dim outFile As String zqeU>V~<F outFile = cDir & sampName & "_FRED.txt" {kzM*!g Open outFile For Output As #1 h~1QmEat Print #1, "type bsdf_data" {Xp.}c Print #1, "format angles=deg bsdf=value scale=1" lN&GfPP6 ^?A+`1- 'Loop the file list, skip the two header lines and write the remaining data to file 94R+S-|P Dim lineArray() As String, curLine As Long l>]M^=,&7 For Each curFile In fList J0oR]eT} Print "Merging data from file " & curFile [ M'1aBx^ ReadFile( cDir & curFile, lineArray ) N.<hZ\].= For curLine = 2 To UBound(lineArray) #=tWCxf= Print #1, lineArray(curLine) r
{8 Next Xnh1pwDhe< Next pr?/rXw f6#H@
X 'Close the output file `=*svrmS Close #1 gu/Yc`S[ J0K"WmW Print "Finished merging RPC data for sample " & sampName v+OVZDf Print "FRED formatted data file: " & Chr(9) & outFile v!uLd.( End Sub 9f@)EKBK <uvshZv 'Utility function to read the contents of a file into an array of strings. Q4x71*vy Function ReadFile(ByVal fileName As String, _ |(V3 ByRef lineArray() As String) As Long .jKO 6f BO_^3Me* ReadFile = -1 d?K8Ygz Dim oFSO As Object IlrmXSr Set oFSO = CreateObject("Scripting.FileSystemObject") 9p.>L8 Erase lineArray OTm`i>rB n*1UNQp@]O Dim fid As Long S]N4o'K}q If oFSO.fileexists( fileName ) Then 71%u|k8| fid = FreeFile() /[s$A? Open fileName For Input As fid 87Kx7CKF" lineArray = Split(Input(LOF(fid), fid), vbCrLf) '3Ri/V, Close fid jt3SA
[cy End If Nm~#$orI| Set oFSO = Nothing Ixw,$%-]y6 Return UBound( lineArray ) *v9G#[gG . ~<+ End Function _=MWt_A '3 ,aJrN!fzU Sub GetFileList( ByVal in_dir As String, _ DH^^$) ByRef in_flist() As String ) e#('`vGB v^tKT& 'Redimension the file list array |`nVr>QF& Erase in_flist 9 2EMDKJ R<=t{vTJ5 'Tracks how many files are found [wR8q,2
Dim fCount As Long eBB
D9SI fCount = 0 ($s{em4L 2Kidbf 'Recurse directory and search for text files *pMA
V[^ Dim f As String NEk [0 f = Dir$(in_dir & "*.txt") 3Z0\I\E While f <> "" lg1D>=(mY ReDim Preserve in_flist(fCount) | QA8"&r in_flist(fCount) = f J[l K fCount += 1 J$;)TI f = Dir$() 7h2bL6Y88 Wend ^Ram8fW ReDim Preserve in_flist(fCount-1) |