RPC Photonics扩散片BSDF
摘要: VR\}*@pNp |I29m` 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。 #9F>21UU u[oV
Jvc 背景: E!BzE_|i 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。 L]u^$=rI FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 &Yc'X+'4
图1. RPC Photonics工程漫射体结构及光束投射形状 =LKM)d=1 ST0TWE' YDj5+'y 步骤 ^!0z+M:>^ >/lB%<$/ 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。 lI+^}-< DEt!/a{X
图2. RPC Photonics工程漫射体不同类型的散射数据 kyt HOn# 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) c!'\k,ma<9 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 k7;i^$@c 例如下所示: \=]`X2Ld Sample name: EDF-C1-56 }p?67y/ Merging data from file EDF-C1-56 0-0.txt S^|U" Finished merging RPC data for sample EDF-C1-56 oveK;\7/m FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^SKHYo`,,N 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 jzGK(%sw" a. 创建一个新的散射库 5Pxx)F9] b. 散射模型命名 {K6Z.-.` c. 改变散射模型为“Tabulated BSDF”. wf &Jd:)4t d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 41s\^'^& e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 \nPf\6;M f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, KfYU.Q g. 点击OK 4d}=g]P 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 )fxn bBz{ NO@`*:.^Y BzkfB:wr 脚本代码: YD;d*E%t 0a^bAEP '#Language "WWB-COM" vy{k"W&S &;)B
qqXc Option Explicit `JpFqZ'58 gmgri Sub Main Xt$P!~Lu QB!_z4UJ_; 'Cleanup .4tu{\YX ClearOutputWindow() oP%5ymL%J _ DT,iF*6 Print "Merging RPC Photonics BSDF Data Files" DR:DXJc SetTextColor(255,0,0) eEP{?F^I[ Print "Note: Script should be located in the same folder as the BSDF TXT files." .{*l, Print "Note: Do not run this script multiple times without deleting the output file between executions." }+G5i_a SetTextColor(0,0,0) N3aqNRwlk ZfH>UHft 'Current directory of this script (should be the same as the text files being merged) .P/0`A{& Dim cDir As String 9__B!vw: cDir = MacroDir$ & "\" ) \T H' 5pe)CjE: 'Array which will be populated with the list of files to be merged D GcpYA.7' Dim fList() As String, curFile As String W=w]`' GetFileList( cDir, fList ) qsbV)c iLNUydiS Print "" 1[u{y{9 q Print "Files found for merging:" (dD7"zQ For Each curFile In fList PnInsf%; Print Chr(9) & curFile Z"_8l3 Next -N wic| ~;H,cPvrEg 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Rvx7}ZL! Dim nameArray() As String, sampName As String
DuR9L' nameArray = Split(fList(0)," 0-0.txt") 3Il._]# sampName = nameArray(0) W;2J~V!c Print "" F[yofRN Print "Sample name: " & Chr(9) & sampName l9="ccM #jG?{j3;? 'Open an output file and write the FRED header data v;9(FLtL Dim outFile As String ;-@: }/ outFile = cDir & sampName & "_FRED.txt" ,=4,eCS Open outFile For Output As #1 njg0MZBqA Print #1, "type bsdf_data" G?=&\fg_: Print #1, "format angles=deg bsdf=value scale=1" *pSnEWwE +~aIT=i3 'Loop the file list, skip the two header lines and write the remaining data to file o5DT1>h Dim lineArray() As String, curLine As Long `iM%R3& For Each curFile In fList ZvT,HJ0? Print "Merging data from file " & curFile %<a3[TQd`\ ReadFile( cDir & curFile, lineArray ) UhL1Y
NF_ For curLine = 2 To UBound(lineArray) T$%QK?B Print #1, lineArray(curLine) amC)t8L? Next y*{zX=]l< Next $w{d4" ) `'<$N<! 'Close the output file ;*j
K! Close #1 D6Aa5&rO+ =FV(m
S Print "Finished merging RPC data for sample " & sampName N<a%l J Print "FRED formatted data file: " & Chr(9) & outFile av|T|J/( End Sub D:bmq93PC J8r8#Zz 'Utility function to read the contents of a file into an array of strings. E>tHKNyVTp Function ReadFile(ByVal fileName As String, _ |C z7_Rn ByRef lineArray() As String) As Long EYj~Xj8_ 8P-ay<6 ReadFile = -1 P658
XKE Dim oFSO As Object !37I2*+4 Set oFSO = CreateObject("Scripting.FileSystemObject") i]?
Eq?k Erase lineArray >| ,`E
[>54?4{|. Dim fid As Long TmLCmy! If oFSO.fileexists( fileName ) Then OzrIiahz/ fid = FreeFile() |TMn Open fileName For Input As fid r|4D.O] lineArray = Split(Input(LOF(fid), fid), vbCrLf) ;#9?3Os Close fid [O&}Qk End If Bt}90# Set oFSO = Nothing RIXeV*ix Return UBound( lineArray ) T5zS3O hN!;Tny End Function X5/fy"g& dt"/4wCO Sub GetFileList( ByVal in_dir As String, _ eg}g}a ByRef in_flist() As String ) FsWp>}o Gkem _Z 'Redimension the file list array nng|m Erase in_flist )M+po-6$1 8}:$=n4& 'Tracks how many files are found _3 oo%?} Dim fCount As Long p@f
#fs fCount = 0 o
[V8h@K) Qe_{<E 'Recurse directory and search for text files $RY-yKmi Dim f As String P}5bSQ( a3 f = Dir$(in_dir & "*.txt") fb `x1Q While f <> "" 8b]4uI< ReDim Preserve in_flist(fCount) 7afG4
(<k in_flist(fCount) = f n5UUoBv fCount += 1 H i8V=+ f = Dir$() Ly8=SIZ Wend ri8=u$! ReDim Preserve in_flist(fCount-1) tmS2%1o \&kj#)JYA End Sub uGC5XX^ 0*5Jq#5 ]R)wBug QQ:2987619807 zNt//,={
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