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摘要: 3="vOSJ6& fZsw+PSy 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。 n<> ^cD UGgo;e 背景: 45<gO1 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。 8f)pf$v` FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 7^M$u\a)U 图1. RPC Photonics工程漫射体结构及光束投射形状 yENAc sv 7
<]YK`a2d Z(R0IW 步骤 :)B1|1 xt"-Jmox 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。 =ONM#DxH <n~.X<6V' 图2. RPC Photonics工程漫射体不同类型的散射数据 ~OxFgKn23& 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) {r|RH"|?Z( 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 w,R6:*p5 例如下所示: Ik5V? Sample name: EDF-C1-56 !T
,=kh Merging data from file EDF-C1-56 0-0.txt _:5t~29 Finished merging RPC data for sample EDF-C1-56 J9j
@V4 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q2woCxB 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 J>;r(j a. 创建一个新的散射库 ~Jw84U{$ b. 散射模型命名 Pw7uxN` c. 改变散射模型为“Tabulated BSDF”. ;YMg4Cs 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 ) 8==M{M/eM 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。 >py[g0J 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, k2,`W2]^E g. 点击OK H`URJ8k$Q 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 VGxab;#,:3 F!/-2u5gF (0`w.n 脚本代码: YPY,gR /0fsn_ '#Language "WWB-COM" RF'nwzM3 =e PX^J*M' Option Explicit l;R8"L:,p\ " Qyi/r41 Sub Main `jTB9A" !dh:jPpKq 'Cleanup |r)QkxdU, ClearOutputWindow()
6Bcr.` ~ QohP`_ Print "Merging RPC Photonics BSDF Data Files" Ej6ho 0_ SetTextColor(255,0,0) P2C>IS Print "Note: Script should be located in the same folder as the BSDF TXT files." S+wT}_BQ Print "Note: Do not run this script multiple times without deleting the output file between executions." _JTK$\ SetTextColor(0,0,0) E.ji;5 GQd[7j[sh 'Current directory of this script (should be the same as the text files being merged) 1=,2i) Dim cDir As String Hy,""Py cDir = MacroDir$ & "\" vZ57
S13 2 @T~VRy 'Array which will be populated with the list of files to be merged ;~d$OM Dim fList() As String, curFile As String @H~oOf GetFileList( cDir, fList ) =2NrmwWZs *!*%~h8V Print "" .oTS7rYw Print "Files found for merging:" ^EkxZ4*g For Each curFile In fList .8%b;b Print Chr(9) & curFile S&XlMu Next mTUoFXX[ Buh}+n2]5 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. &.s.g\ Dim nameArray() As String, sampName As String r7R.dD/. nameArray = Split(fList(0)," 0-0.txt") -KfK~P3PF sampName = nameArray(0) c?}G;$ Print "" XOI"BLd Print "Sample name: " & Chr(9) & sampName U:3OE97 Q3^h 'Open an output file and write the FRED header data S
~fz Dim outFile As String fc<y(uX outFile = cDir & sampName & "_FRED.txt" FkuD Gg~a Open outFile For Output As #1 CxJ3u Print #1, "type bsdf_data" lA1 Print #1, "format angles=deg bsdf=value scale=1" d6JW" /
j%~#@ 'Loop the file list, skip the two header lines and write the remaining data to file ,c?(
|tF Dim lineArray() As String, curLine As Long aBG^Xhx For Each curFile In fList w%X@os}E Print "Merging data from file " & curFile tK/,U
=+ ReadFile( cDir & curFile, lineArray ) (S+/e5c) For curLine = 2 To UBound(lineArray) Mlo,F1'?> Print #1, lineArray(curLine) YwF&-~mp7n Next $0 vT_ Next oD\t4]?E w $-q& 'Close the output file pmWy:0 R Close #1 gC iM\Qx |o9`h 9i Print "Finished merging RPC data for sample " & sampName [+R_3'aK Print "FRED formatted data file: " & Chr(9) & outFile qhcx\eD:? End Sub G/(,,T}eG
_(8# 'Utility function to read the contents of a file into an array of strings. "M[&4'OM Function ReadFile(ByVal fileName As String, _ GQhy4ji'z ByRef lineArray() As String) As Long _xm<zy{`S x0ipk} ReadFile = -1 _
A#lyp Dim oFSO As Object 6S_mfWsi Set oFSO = CreateObject("Scripting.FileSystemObject") Sa[lYMuB Erase lineArray 'v
CMf U!uJ )mm Dim fid As Long NQZ /E )f If oFSO.fileexists( fileName ) Then u%yYLpaKf fid = FreeFile() Eri007? D Open fileName For Input As fid P!IA;i lineArray = Split(Input(LOF(fid), fid), vbCrLf) K\fD'; Close fid jN*wbqL End If jXALL8[c Set oFSO = Nothing -qaO$M^Q Return UBound( lineArray ) ]cS(2hP7 *c/V('D/ End Function ji\LC%U- h^Yh~84T Sub GetFileList( ByVal in_dir As String, _ H?Q--pG8 ByRef in_flist() As String ) #5{xWMp/0 *n&Sd~Mg 'Redimension the file list array phf{b+'#X Erase in_flist 0|j44e} W'"?5} ( 'Tracks how many files are found N'&>bO?@` Dim fCount As Long YsVKdh fCount = 0 XxdD)I '<<@@.(f 'Recurse directory and search for text files B;NK\5> Dim f As String [f lK f = Dir$(in_dir & "*.txt") G/},lUzLg While f <> "" F
{L# ReDim Preserve in_flist(fCount) Q(yg bT in_flist(fCount) = f er-0i L@ fCount += 1 @%L f = Dir$() :{Z%dD Wend HpIi- Es7C ReDim Preserve in_flist(fCount-1) 9e>2kd /<$|tp\Rc End Sub w42{)S"
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