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摘要: Z#w1,n88 Z A1?' 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。 G&/}P$ m3F.-KPO 背景: 5EFow-AH 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。 "o<:[c9/ 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。 UmiW_JB 图1. RPC Photonics工程漫射体结构及光束投射形状 OrPIvP<w@ JI3AR
e?y %Q1v8l.} 步骤 42Gr0+Mb v_{`O'#j^ 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。 , *e^,|# xPQO}wKa 图2. RPC Photonics工程漫射体不同类型的散射数据 #n{wK+lz 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) vFL3eu# 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 }s}b]v 例如下所示: 2i |wQU5w Sample name: EDF-C1-56
/A_</GYs Merging data from file EDF-C1-56 0-0.txt /'TzHO9_` Finished merging RPC data for sample EDF-C1-56 fS1N(RZ1 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt (66X 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 s:*gjoL a. 创建一个新的散射库 #8;^ys1f b. 散射模型命名 _f|Au`7m c. 改变散射模型为“Tabulated BSDF”. xb8fV*RO8A 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 ) O5Yk=-_m 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。 EVgn^, 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, "! p#8jR^ g. 点击OK ?Sn$AS I
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 duXv
[1 6\4oHRJC kzJNdYtdH 脚本代码: M`BD]{tN} 0m7J'gm{ '#Language "WWB-COM" t
Z\ BxG0vJN| Option Explicit DG7FG-- *:
e^yi Sub Main }=s@y"[" C([;JO
11[ 'Cleanup .X_k[l 9 ClearOutputWindow() 3 c@Cb`w@ D*vrQ9
8 Print "Merging RPC Photonics BSDF Data Files" HY5g>wv@ SetTextColor(255,0,0) Vfg144FG' Print "Note: Script should be located in the same folder as the BSDF TXT files." Y&Pi`E9= Print "Note: Do not run this script multiple times without deleting the output file between executions." )uwpeq$j7l SetTextColor(0,0,0) YOGwQ +wD--24!( 'Current directory of this script (should be the same as the text files being merged) \ts:' Dim cDir As String K JPB- cDir = MacroDir$ & "\" J:#B,2F+^ %
eW>IN]5 'Array which will be populated with the list of files to be merged #OJ^[Zi< Dim fList() As String, curFile As String vq( @B GetFileList( cDir, fList ) LNXhzW vB/MnEKR Print "" KSh<_`j Print "Files found for merging:" >I]t|RT]) For Each curFile In fList ^uIZs}=+ Print Chr(9) & curFile rm2{PV<+d Next aODOc J N U+~0m!|4 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. .Ks&r Dim nameArray() As String, sampName As String :'1ePq nameArray = Split(fList(0)," 0-0.txt") W zy8 sampName = nameArray(0) *ubLuC+b Print "" wd..{j0& Print "Sample name: " & Chr(9) & sampName ln9MVF'!& .H7"nt^ 'Open an output file and write the FRED header data [5 a`$yaQ Dim outFile As String [K&O]s<Y outFile = cDir & sampName & "_FRED.txt" hkHMBsNi Open outFile For Output As #1 cU%#oEMf< Print #1, "type bsdf_data" h!yF Print #1, "format angles=deg bsdf=value scale=1" (yc$W9 2NIK0%6 'Loop the file list, skip the two header lines and write the remaining data to file ,dzbI{@6 Dim lineArray() As String, curLine As Long r6PiZgR For Each curFile In fList ~u,g5 Print "Merging data from file " & curFile 'PV,c|f> ReadFile( cDir & curFile, lineArray ) {< jLfL1 For curLine = 2 To UBound(lineArray) ]~3wq[O Print #1, lineArray(curLine) S U2`H7C* Next ;Jv)J3y Next ;\4}Hcg CM9+h;Zm 'Close the output file )c]GgPH Close #1 >@h0@N Gxm+5q Print "Finished merging RPC data for sample " & sampName 8{%/!ylJz Print "FRED formatted data file: " & Chr(9) & outFile t8]u#bx"? End Sub fm&l0 HmbTV(lC 'Utility function to read the contents of a file into an array of strings. dL6sb;7R Function ReadFile(ByVal fileName As String, _ <mrLld#_:C ByRef lineArray() As String) As Long qL A s:I^AL5 ReadFile = -1 t~sW]<qjp Dim oFSO As Object (5_o H Set oFSO = CreateObject("Scripting.FileSystemObject") lSXhHy Erase lineArray CEqfsKrsxE ou,W|<% Dim fid As Long d@,q6R}!MP If oFSO.fileexists( fileName ) Then aH'^`]'_= fid = FreeFile() EU>@k{Qt Open fileName For Input As fid ~NU~jmT2 lineArray = Split(Input(LOF(fid), fid), vbCrLf) ax>en]rNP Close fid >[ lj8n End If ,_\h)R_ Set oFSO = Nothing Dih~5 Return UBound( lineArray ) `1M_rG1/+ R;I}#b cJ End Function ^h^j:!76j |])%yRAGQ Sub GetFileList( ByVal in_dir As String, _ z_A%>E4 ByRef in_flist() As String ) 4.H!rkMM OjrQ[`(E 'Redimension the file list array cf0em! Erase in_flist Z# 7HuAF{] 7F}I.,<W 'Tracks how many files are found 7@+0E2' Dim fCount As Long ?em )om fCount = 0 Z U
f<s? NmOQ7T 'Recurse directory and search for text files +/x|P- Dim f As String [m}x f = Dir$(in_dir & "*.txt") IQ2<Pinv While f <> "" F^`sIrZvs ReDim Preserve in_flist(fCount) .!)7x3|$[ in_flist(fCount) = f yU .B(| fCount += 1 d=lZhqY f = Dir$() Z;WqKIM# Wend 1(On.Y= ReDim Preserve in_flist(fCount-1) A4( ^I
u P3lNns3 End Sub 2eyvY|:Q>
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