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摘要: Oj0/[(D- g< {jgF 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。 vH#^ |u s0"1W"7vh 背景: ?o9g5Z 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。 aNCIh@m~ 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。 6]^}GyM! 图1. RPC Photonics工程漫射体结构及光束投射形状 Pw'3ya8 # -Ts]4v /^\6q"' 步骤 L%JmdY; ZWSYh>" 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{9sn,<: @vaK-&|#$ 图2. RPC Photonics工程漫射体不同类型的散射数据 X}xy
v 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) e? fFh,a 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 eJ#q! < 例如下所示: GV([gs Sample name: EDF-C1-56 Dw^d!%Ala Merging data from file EDF-C1-56 0-0.txt m>'sM1s Finished merging RPC data for sample EDF-C1-56 Khxl'qj FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt >LwZ"IEV 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Ed)t87E a. 创建一个新的散射库 b{t'Doe b. 散射模型命名 0>m-J c. 改变散射模型为“Tabulated BSDF”. ^60BQ{ne 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 ) Nd*zSsVlq 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。 70L{u+wIy 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, R1FBH:Iu g. 点击OK `2?9eXC 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 nj~1y') W^q;=D6uh BXVmt!S5F 脚本代码: { CkxUec 'k#^Z '#Language "WWB-COM" `bffw:;% C-$S]6 Option Explicit ^e>`ob [dL4u^]{ Sub Main c?CjJ}-7 RUmJ=i'4/ 'Cleanup v*1UNXU\ ClearOutputWindow() uHUicZf. ]z,W1Zs? Print "Merging RPC Photonics BSDF Data Files" n97A'"'wz SetTextColor(255,0,0) C w`v\
9 Print "Note: Script should be located in the same folder as the BSDF TXT files." :~pPB#)nk Print "Note: Do not run this script multiple times without deleting the output file between executions." <IGQBu#ZH SetTextColor(0,0,0) T"XP`gk 37Z:WJ?
'Current directory of this script (should be the same as the text files being merged) 3ADTYt". Dim cDir As String HKCMKHR cDir = MacroDir$ & "\" e;56}w {b[8x
'Array which will be populated with the list of files to be merged YsXP$y]g- Dim fList() As String, curFile As String v"Fa_+TVx GetFileList( cDir, fList ) r"SuE:D T+m`a# Print "" AxUj CerNf Print "Files found for merging:" Aq}]{gfQ1 For Each curFile In fList oBQr6-nZ Print Chr(9) & curFile s2Ivd*=mT Next zo&'2I B i?DmrH 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. c-!rJHL` Dim nameArray() As String, sampName As String ](4V3w. nameArray = Split(fList(0)," 0-0.txt") j8!fzJG sampName = nameArray(0) RX%*:lXi_ Print "" 3HC aZ?Ry' Print "Sample name: " & Chr(9) & sampName |r!G(an1x4 I3D8xl>P\ 'Open an output file and write the FRED header data l~wx8
,?G Dim outFile As String ;=Jj{FoG% outFile = cDir & sampName & "_FRED.txt" Z16G Open outFile For Output As #1 Z}TuVE Print #1, "type bsdf_data" _=XzQZT!L Print #1, "format angles=deg bsdf=value scale=1" J
(Yfup cOthq87: 'Loop the file list, skip the two header lines and write the remaining data to file CE:TQzg Dim lineArray() As String, curLine As Long
!9DqW&8 For Each curFile In fList -kxNJ Gc? Print "Merging data from file " & curFile @kn0f` ReadFile( cDir & curFile, lineArray ) %p)6m2Sb For curLine = 2 To UBound(lineArray) xxgS!J Print #1, lineArray(curLine) /pZLt)=P Next g= k}6"F~ Next dX: (%_Mn c%r?tKG6 'Close the output file @dV'v{:, Close #1 0:R} z_~f/ Print "Finished merging RPC data for sample " & sampName 8MGtJ'. Print "FRED formatted data file: " & Chr(9) & outFile =O1N*'e End Sub Ey=(B'A~ *<#jr 'Utility function to read the contents of a file into an array of strings. !
R?r)G5E Function ReadFile(ByVal fileName As String, _ [
/w{,+U ByRef lineArray() As String) As Long ^[Cpu_]D 9%j_"+<c ReadFile = -1 A!No:?S Dim oFSO As Object sH(4.36+ Set oFSO = CreateObject("Scripting.FileSystemObject") ttuQ,SD Erase lineArray A9ia[2[ :XEP:8 Dim fid As Long ao#{N=mn If oFSO.fileexists( fileName ) Then uOc:^ fid = FreeFile() A1zM$
wDU Open fileName For Input As fid }(z[
rZ lineArray = Split(Input(LOF(fid), fid), vbCrLf) VG^*?62 Close fid \dTX%<5D End If
'{p/F
$ Set oFSO = Nothing #ok1qT9_ Return UBound( lineArray ) M5s>;q) Uc%(#I]Mi End Function >
$DMVtE0 'Ar+k\.J Sub GetFileList( ByVal in_dir As String, _ (wU<Kpt?J ByRef in_flist() As String ) <61T)7 sx IvL7jl 'Redimension the file list array F0W4B Erase in_flist M?Tb9c?` W\:!v%C 'Tracks how many files are found MWl?pG!Y Dim fCount As Long #'fh'$5" fCount = 0 VliX'.- qk;*$Q 'Recurse directory and search for text files 'd 4I/ Dim f As String A!\ouKyayS f = Dir$(in_dir & "*.txt") q`_d>l While f <> "" QE*O~Yj ReDim Preserve in_flist(fCount) >UvLeS2h:y in_flist(fCount) = f "{1`~pDj? fCount += 1 ;=
^kTb`X f = Dir$() bD*V$w*P Wend . > [d:0 ReDim Preserve in_flist(fCount-1) Osncl5PD) u+%Ca,6 End Sub xDU>y 'NHtCs=F ]Ir{9EE
v QQ:2987619807 '8\7(0$c
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