-K6y#O@@ 摘要: ym2"D?P
( 0Q[;{}W} 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。 W?du ] d/\ajQ1:: 背景: Cw~fP[5XMF 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。 <A&Zl&^1 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 1?,C d fPG3$<Zr [iC]Wh% d5n>2iO 步骤 i>(TPj| Raf-I+ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 DDZnNSo<JQ 图2. RPC Photonics工程漫射体不同类型的散射数据 l6.&<0pLT l$m}aQ%h 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$CF*%+t 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 40 zO4 例如下所示: 0KjCM4t Sample name: EDF-C1-56 rv2;)3/* Merging data from file EDF-C1-56 0-0.txt imyfki $B Finished merging RPC data for sample EDF-C1-56 Nf}i/ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt T5wVJgN> 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 877Kv); a. 创建一个新的散射库 *TPWLR ^ b. 散射模型命名 D0h6j0r5 c. 改变散射模型为“Tabulated BSDF”. 8[:G/8VI 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 ) hd)WdGJp 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。 $}=r45e0K f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, K+P a b ? g. 点击OK
=)J<R; 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 6#HnA"I2n ~w}=Oby'y M*aYcIU(( 脚本代码: `)Y 5L}c= @[{5{ y '#Language "WWB-COM" Y[W]YPs bl\;*.s' Option Explicit f,ql8q(|J N:,V{Pw Sub Main LdnTdh? W3n[qVZIC 'Cleanup ..=lM:13| ClearOutputWindow() _WI~b Y\F4 Print "Merging RPC Photonics BSDF Data Files" ;s#]."v_= SetTextColor(255,0,0) Bk5ft4v- Print "Note: Script should be located in the same folder as the BSDF TXT files." F1p|^hYDW Print "Note: Do not run this script multiple times without deleting the output file between executions." \!*F:v0g^ SetTextColor(0,0,0) ,_K:DSiB zbfe=J4c 'Current directory of this script (should be the same as the text files being merged) ~w(A3I. Dim cDir As String & d* bQv$ cDir = MacroDir$ & "\" Y@+9Ukd/ He&A>bA)z 'Array which will be populated with the list of files to be merged c*R18,5- Dim fList() As String, curFile As String <"av /`; GetFileList( cDir, fList ) AG"iS<u IEWl
I Print "" Zt
1nH Print "Files found for merging:" kRH
D{6mol For Each curFile In fList qipS`:TER Print Chr(9) & curFile 2FGCf} , Next Bo
??1y ACF_;4%& 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. pE$*[IvQ' Dim nameArray() As String, sampName As String %h
v-3L#V nameArray = Split(fList(0)," 0-0.txt") EW/N H&{ sampName = nameArray(0) ML%JTx0+Z Print "" |RDE/ Print "Sample name: " & Chr(9) & sampName A@reIt _,w*Rv5= 'Open an output file and write the FRED header data ozA%u,\7k Dim outFile As String !k#N]
9D3 outFile = cDir & sampName & "_FRED.txt" }{v0}-~@ Open outFile For Output As #1 Z 2lX^z Print #1, "type bsdf_data" ^b*ub(5Ot Print #1, "format angles=deg bsdf=value scale=1" nyOvB#f N8X)/W 'Loop the file list, skip the two header lines and write the remaining data to file 4ZB]n,pfT Dim lineArray() As String, curLine As Long mOFp!( For Each curFile In fList <iM}p^jX9 Print "Merging data from file " & curFile ZQmg;L&7 ReadFile( cDir & curFile, lineArray ) fLV@~T| For curLine = 2 To UBound(lineArray) 8'u,}b) Print #1, lineArray(curLine) GD!!xt Next d!"gb,ec Next lT'V=,Y
t u3HaWf3 'Close the output file $[b1_Db Close #1 OGW0lnQ/ !@>:k3DC& Print "Finished merging RPC data for sample " & sampName X$ A ]7t Print "FRED formatted data file: " & Chr(9) & outFile #vTF:r End Sub #*G}v%Ow/u 'f6!a5qC 'Utility function to read the contents of a file into an array of strings. Ex{;&UWm Function ReadFile(ByVal fileName As String, _ e{.P2rnh ByRef lineArray() As String) As Long 6lwWFR+k 7s;*vd> ReadFile = -1 t<cWMx5ra Dim oFSO As Object I!.-}]k Set oFSO = CreateObject("Scripting.FileSystemObject") )(yKm/50 Erase lineArray j)}TZx4~ MED_#OS Dim fid As Long D~,iI7ac If oFSO.fileexists( fileName ) Then +sXnC\ fid = FreeFile() Y7`Dx'x Open fileName For Input As fid H#QPcp@ lineArray = Split(Input(LOF(fid), fid), vbCrLf) YV6w}b: Close fid ^!SwY_> End If Qe=eer~jI Set oFSO = Nothing UDb Return UBound( lineArray ) Ev&aD u)l[*";S End Function (-{.T Qa1G0qMEIF Sub GetFileList( ByVal in_dir As String, _ x!UGLL]_M ByRef in_flist() As String ) d^`n/"Ice xic&m5j
m 'Redimension the file list array ;AT~?o`n Erase in_flist !XY}\zKq x%RE3J- 'Tracks how many files are found 6!RKZj) Dim fCount As Long ;zi4W1 fCount = 0 fJn4'Q*U z!^3%kJJ> 'Recurse directory and search for text files EyV6uk~ Dim f As String `e5f69" f = Dir$(in_dir & "*.txt") l I+KT_|L While f <> "" 8FBXdk?A ReDim Preserve in_flist(fCount) Fw6x
(j" in_flist(fCount) = f }do=lm?/ fCount += 1 M532>+A]Za f = Dir$() <2PO3w?Z Wend bd`}2vr ReDim Preserve in_flist(fCount-1) |