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摘要: {F S)f ,KU%"{6 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。 (U
4n} J c;06>1=wP5 背景: _*b`;{3 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。 {<-wm-]mo 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。 oe0YxSauL 图1. RPC Photonics工程漫射体结构及光束投射形状 XXA]ukj;r 9Oo`4 [IAk9B.\ 步骤 $)BPtGMGo v~jm<{={g 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 hZ!kh3@:` [Q J 图2. RPC Photonics工程漫射体不同类型的散射数据 S8v?H|rm 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) NffKK:HvBB 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 *[*q#b$j 例如下所示: x%HxM~& Sample name: EDF-C1-56 Gf:dN_e6. Merging data from file EDF-C1-56 0-0.txt 5`g VziS!S Finished merging RPC data for sample EDF-C1-56 67Qu<9}<- FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 8#- Nx]VM 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 c3o3i a. 创建一个新的散射库 ,^Q~w
b!{ b. 散射模型命名 V\opC6*L_e c. 改变散射模型为“Tabulated BSDF”. !H{>c@i 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 ) 5MKM;6cA&p 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。 4;r,U{uR 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, PAtv#)h g. 点击OK TW70z]B 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 cAot+N+9|] 5MD'AP: kE8s])Z,+ 脚本代码: :N"&o(^ p]/[ji '#Language "WWB-COM" 23`salLclG MPy><J Option Explicit 4cM0f,nc+ HW,v" Sub Main BHYguS^qz \~(kGE--+ 'Cleanup F]r'j
ZL ClearOutputWindow() $p&eS_f |yzv o"3 Print "Merging RPC Photonics BSDF Data Files" U1pE2o- SetTextColor(255,0,0) &=$f\O1Ty Print "Note: Script should be located in the same folder as the BSDF TXT files." W[
W)q%[) Print "Note: Do not run this script multiple times without deleting the output file between executions." ~{5va SetTextColor(0,0,0) @G=7A;-pv0 N5ZOpRH{ 'Current directory of this script (should be the same as the text files being merged) ~gGkw# Dim cDir As String JX[]u<h? cDir = MacroDir$ & "\" _KxR~k^ )oz2V9X{ 'Array which will be populated with the list of files to be merged $C fp1# Dim fList() As String, curFile As String rKI<! GetFileList( cDir, fList ) un -h%-e| ?wCX:?g Print "" #\n*Qg4p Print "Files found for merging:" D1 v0`od' For Each curFile In fList U` HY
eJ Print Chr(9) & curFile L?N-uocT Next x9a\~XL>a q*`
m%3{ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. <OKc?[ Dim nameArray() As String, sampName As String rxyeix nameArray = Split(fList(0)," 0-0.txt") g<M!]0OK sampName = nameArray(0) svl!"tMXl Print "" "-dA\,G Print "Sample name: " & Chr(9) & sampName j|K;Yi 3o?eUwI} 'Open an output file and write the FRED header data >dm9YfQ Dim outFile As String `67i1w` outFile = cDir & sampName & "_FRED.txt" Q~svtN Open outFile For Output As #1 .Wy' Print #1, "type bsdf_data" |m"Gr)Gm Print #1, "format angles=deg bsdf=value scale=1" r hucBm E?P>s T3B 'Loop the file list, skip the two header lines and write the remaining data to file 3Wv^{|^ Dim lineArray() As String, curLine As Long PQSmBTs. For Each curFile In fList ~M} K]Li Print "Merging data from file " & curFile
DwGM+)! ReadFile( cDir & curFile, lineArray ) 87+fd_G For curLine = 2 To UBound(lineArray) U0:*?uA. Print #1, lineArray(curLine) B>!mD{N Next aEIz,^3 Next $`/UG0rdC QkD
~ 'Close the output file E&y)`>Nq{ Close #1 :?g+\:`/0j >A-{/"p# Print "Finished merging RPC data for sample " & sampName 7_l
Wr Print "FRED formatted data file: " & Chr(9) & outFile 9wldd*r End Sub :adz~L$ v G\J8s 'Utility function to read the contents of a file into an array of strings. U), HrI>; Function ReadFile(ByVal fileName As String, _ M80Q6K ByRef lineArray() As String) As Long Xnjl {` Y3&,U ReadFile = -1 \OFmd!Cz Dim oFSO As Object |/n7(!7$[v Set oFSO = CreateObject("Scripting.FileSystemObject") %,02i@Fc Erase lineArray q6C`hVMl i.)n#@M2 Dim fid As Long s=jYQ5nv If oFSO.fileexists( fileName ) Then `H$XO{w fid = FreeFile() #\Rxqh7 Open fileName For Input As fid md'wre3 lineArray = Split(Input(LOF(fid), fid), vbCrLf) n~|?)EL Close fid 3Q=\W<Wu End If ut560,h~ Set oFSO = Nothing S!=R\_{u$ Return UBound( lineArray ) {fHor Y]0c%Fd End Function [(#)9/3, l~]] RgU Sub GetFileList( ByVal in_dir As String, _ PN]hG,q*4O ByRef in_flist() As String ) hZ
e{Ri |a#ikY _nd 'Redimension the file list array &k}B66 Erase in_flist Ul]7IUzsu fv8x7l7 'Tracks how many files are found V^[&4 Dim fCount As Long o(Z~J}l({ fCount = 0 mKO~`Wq%@ L f"!:] 'Recurse directory and search for text files 1aRTvaGo Dim f As String -;_"Y]# f = Dir$(in_dir & "*.txt") ;2`6eyr While f <> "" >\?
z,Nin ReDim Preserve in_flist(fCount) |au`ph5 in_flist(fCount) = f +)q ,4+K%} fCount += 1 ^t
gjs$M| f = Dir$() Bx|W#:3e Wend ?|W3RK; ReDim Preserve in_flist(fCount-1) ,s3| PL$XXj>|: End Sub 4uoZw3O
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