+p$lVnAt 摘要: 4HpKKhv" J06D_'{ 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。 :%h|i&B
ltKMvGEF 背景: MpTOC&NG%s 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。 :x3xeVtY 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 Yy;BJ_ ZSr!L@S >uDC!0)R {q^UWv?1 步骤 D^}2ilk! q8H nPXV 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。 j<k-w 图2. RPC Photonics工程漫射体不同类型的散射数据 #N;&^El LQR^lD+_= 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) z6P~HF+&h 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 AY;[v.Ff4 例如下所示: r`pf%9k Sample name: EDF-C1-56 '<>?gE0Cd Merging data from file EDF-C1-56 0-0.txt c7.M\f P
Finished merging RPC data for sample EDF-C1-56 bz1AmNZG FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7*
[ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 0\,! a. 创建一个新的散射库 nTD4^' b. 散射模型命名 yMC6 Gvp c. 改变散射模型为“Tabulated BSDF”. T=RabKVYP 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 ) S~R[*Gk_uT 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。 5#y_EpL" 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, =\mJ5v"hA g. 点击OK ~z,qr09 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 d%RH]j4 [7 NO !^ $<"I*l@ 脚本代码: :,
3S5!(y ~=I:go '#Language "WWB-COM" [KCR@__ Q3Y(K\ Option Explicit +~= j3U R&$fWV;' Sub Main y.s\MWvv>u 3E0C$vKM 'Cleanup m4yWhUi(o ClearOutputWindow() t,Q"Pt? 5m;BL+>YE Print "Merging RPC Photonics BSDF Data Files" EB@rIvUi, SetTextColor(255,0,0) 4?bvJJuf) Print "Note: Script should be located in the same folder as the BSDF TXT files." >
6=3y4tP Print "Note: Do not run this script multiple times without deleting the output file between executions." IkG;j+= SetTextColor(0,0,0) Az-!X!O*f ;/kmV~KG 'Current directory of this script (should be the same as the text files being merged) IM,4Si2 Dim cDir As String <;uM/vSi cDir = MacroDir$ & "\" mD|Q+~=|e fsWIz1K 'Array which will be populated with the list of files to be merged )."dqq^ q Dim fList() As String, curFile As String >&k`NXS|V GetFileList( cDir, fList ) cmAdQ)(Kzd _g-0"a{- Print "" LFZ*mRiuKE Print "Files found for merging:" `~=NBN=tiL For Each curFile In fList EXwU{Hl Print Chr(9) & curFile f0R+Mz8{ Next `C$QR
8 EWY'E;0@5 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 3}fhU{-c Dim nameArray() As String, sampName As String `U|zNizO nameArray = Split(fList(0)," 0-0.txt") WJ LqH< sampName = nameArray(0) b`%!\I Print "" KD\sU6 Print "Sample name: " & Chr(9) & sampName F,Ve, 7kh UJ(UzKq8 'Open an output file and write the FRED header data wQ~]VVRN Dim outFile As String #sk~L21A outFile = cDir & sampName & "_FRED.txt" ,?HM5c{'[Y Open outFile For Output As #1 n,LM"N:
Print #1, "type bsdf_data" `M(st%@n Print #1, "format angles=deg bsdf=value scale=1" h%NM%;"H/ fVVD}GM= 'Loop the file list, skip the two header lines and write the remaining data to file kbJ4CF}H Dim lineArray() As String, curLine As Long c-!3wvt) For Each curFile In fList =+I-9= Print "Merging data from file " & curFile z-:>[Sn ReadFile( cDir & curFile, lineArray ) k*!iUz{] For curLine = 2 To UBound(lineArray) q*C-DiV Print #1, lineArray(curLine) 3N|6?'m Next *-uzsq.W Next @1<VvW= Aa]3jev 'Close the output file :z *jl'L Close #1 7+IRI|d -WR<tkK Print "Finished merging RPC data for sample " & sampName "Nz@jv? Print "FRED formatted data file: " & Chr(9) & outFile ^zS;/% End Sub SJlE!MK F6b;qb6n 'Utility function to read the contents of a file into an array of strings. wZW\r!Us Function ReadFile(ByVal fileName As String, _ ~*UY[!+4^= ByRef lineArray() As String) As Long DsD? &: }TAG7U* ReadFile = -1 tmM; Z(9t Dim oFSO As Object Li$2 Gpc/ Set oFSO = CreateObject("Scripting.FileSystemObject") N8x.D-=gG Erase lineArray m{~L Fhhd1 ZLPj1L Dim fid As Long ]*Q,~uV^| If oFSO.fileexists( fileName ) Then {MTtj4$ fid = FreeFile() };EB[n Open fileName For Input As fid UI%4d3 lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4\g[& Close fid |JP'j1 Ka End If 6l &!4r@}
Set oFSO = Nothing i1A<0W| Return UBound( lineArray ) b!`Ze~V Jf\`?g3# End Function mZmEE2h s.n:;8RibP Sub GetFileList( ByVal in_dir As String, _ L/I ]
NA!U ByRef in_flist() As String ) U@{>+G[ @LDs$"f9= 'Redimension the file list array *K@O3n Erase in_flist Z glU{sU IiE^HgM 'Tracks how many files are found W:6#0b"_# Dim fCount As Long %+;l|Z{Uf fCount = 0 01uj-!D$@ 4FZ/~Y1} 'Recurse directory and search for text files v\qyDZ VV Dim f As String ! hEZV&y f = Dir$(in_dir & "*.txt") Sm?|,C3V While f <> "" RAws{<6T- ReDim Preserve in_flist(fCount) C8)Paop$ in_flist(fCount) = f %}Y&qT? fCount += 1 </?ef& f = Dir$() o@]n<ZYo Wend 6E:H ReDim Preserve in_flist(fCount-1) |