RPC Photonics扩散片BSDF
摘要: IOS^|2:, E;$$+rA 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。 oo\IS\ d&?F#$> 7| 背景: qNy-o\;XN Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 sX
Z4U0# FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 Gg}t-_M
图1. RPC Photonics工程漫射体结构及光束投射形状 8M~u_`6 !L/tLHk+ 4NJVW+:2 步骤 R7,pukK *s~i 2} 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 IE|,~M2 lqauk)(A0
图2. RPC Photonics工程漫射体不同类型的散射数据 =^#0. 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) [Zh2DNp 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ps"9;4P 例如下所示: k 5t{
Sample name: EDF-C1-56 JLml#Pu4 Merging data from file EDF-C1-56 0-0.txt :)j7U3u Finished merging RPC data for sample EDF-C1-56 :ET x*c FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt G$|G w 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 T:Bzz)2/ a. 创建一个新的散射库 50COL66:7 b. 散射模型命名 " xlJs93c c. 改变散射模型为“Tabulated BSDF”. ~6] )*y 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 ) K[n<+e;G 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。 t6j-?c(' 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, 3mybG%39 g. 点击OK G}Gb|sD
Zq 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 KLON; OW?uZ<z Un]DFu 脚本代码: % /~os2R bKTqX[ = '#Language "WWB-COM" 7(H?k gNG.l Option Explicit makaI0M 87R%ke Sub Main C-_(13S .[#xQ=9` 'Cleanup { 576+:* ClearOutputWindow() ,nI_8r"M> /FoUo Print "Merging RPC Photonics BSDF Data Files" X #&(~1O SetTextColor(255,0,0) C+DG+_%V*S Print "Note: Script should be located in the same folder as the BSDF TXT files." bOi};/f Print "Note: Do not run this script multiple times without deleting the output file between executions." =CWc` SetTextColor(0,0,0) 'W}~)+zK pHigxeV2 'Current directory of this script (should be the same as the text files being merged) w{RNv%hJ$= Dim cDir As String K<D`(voL cDir = MacroDir$ & "\" =`r ppO V|+ `L- 'Array which will be populated with the list of files to be merged MiRibHXI, Dim fList() As String, curFile As String N'htcC GetFileList( cDir, fList ) 8}Fw%;Cb !IfI-Q Print "" bX a %EMF Print "Files found for merging:" 3csm`JVK For Each curFile In fList 5w]DncdQ~ Print Chr(9) & curFile c(QG4.)m Next &8pCHGmV) l~`txe 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ZD$-V3e` Dim nameArray() As String, sampName As String VFQq`!*i nameArray = Split(fList(0)," 0-0.txt") NEjPU#@c sampName = nameArray(0) 6 Xzk;p Print "" SD)5?{6< Print "Sample name: " & Chr(9) & sampName Bu*W1w\ ;D%$Eh&oma 'Open an output file and write the FRED header data rhlW Dim outFile As String @m*&c* r outFile = cDir & sampName & "_FRED.txt"
2tm~QL Open outFile For Output As #1 M!;`(_2 Print #1, "type bsdf_data" vo:52tCk}m Print #1, "format angles=deg bsdf=value scale=1" Ukk-(gjX )$2%&9b 'Loop the file list, skip the two header lines and write the remaining data to file `I]1l MJ)o Dim lineArray() As String, curLine As Long AAIyr703cQ For Each curFile In fList /vFxVBX Print "Merging data from file " & curFile o=mq$Z:} ReadFile( cDir & curFile, lineArray ) fvAh?<Ul For curLine = 2 To UBound(lineArray) j1'xp`jgv Print #1, lineArray(curLine) I!C(K^ Next )R
[@G. Next U89]?^|bb r6gt9u: 'Close the output file sR7{ i Close #1 BN<#x@m$] [ZL r:2+z Print "Finished merging RPC data for sample " & sampName ;o~+2Fir Print "FRED formatted data file: " & Chr(9) & outFile 3&drof\{ End Sub N"q+UCRC J4Q)`Y\~ 'Utility function to read the contents of a file into an array of strings. *IMF4x5M Function ReadFile(ByVal fileName As String, _ Zi[{\7a ByRef lineArray() As String) As Long qaCi)f!Dl |!jYv'% ReadFile = -1 }J'5EAp Dim oFSO As Object f)u*Q!BDD Set oFSO = CreateObject("Scripting.FileSystemObject") |k['wqn" Erase lineArray j.
ks UJ (Fbm9(q$d Dim fid As Long [0**&.obz If oFSO.fileexists( fileName ) Then thlpj*| fid = FreeFile() ,q'gG`M
N Open fileName For Input As fid <{-(\>f!9 lineArray = Split(Input(LOF(fid), fid), vbCrLf) $v?! 6: Close fid R:pBbA7E End If 110>p Set oFSO = Nothing &kXGWp Return UBound( lineArray ) ^t/'dfF "c !oOaA End Function &<fRej]v 1 o Sub GetFileList( ByVal in_dir As String, _ x3Dg%=R ByRef in_flist() As String ) &}L36|A: pjmGzK 'Redimension the file list array ?hry=I(7r Erase in_flist Up!ZCZ$RC ziB]S@U 'Tracks how many files are found uV/HNzC Dim fCount As Long ]"2 v7)e fCount = 0 +s*l#'Q _($-dJ{ 'Recurse directory and search for text files ZB_16&2Ow Dim f As String d<|lLNS f = Dir$(in_dir & "*.txt") I 1VEm?CQ While f <> "" 5u
u2 _B_L ReDim Preserve in_flist(fCount) nY"rqILX? in_flist(fCount) = f 6ljRV) fCount += 1 QU,TAO f = Dir$() _/z)&0DO Wend sJHy=z0m ReDim Preserve in_flist(fCount-1) '7O{*=`oj ai;gca_P# End Sub x>8}|ou K+`-[v5\ i Ks,i9j QQ:2987619807 /F8\%l+
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