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摘要: /sH3Rk.> e//28=OH 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。 I 6a{'c(P LCK 背景: =;0#F& 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。 "{&\ nt 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。 :^71,An >E 图1. RPC Photonics工程漫射体结构及光束投射形状 ouK&H|' P*T'R ]]Ypi=<' 步骤
$.(%7[ <g5Btwo% 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 @3c5" xIf,1g@Cq9 图2. RPC Photonics工程漫射体不同类型的散射数据 U5z^R>k 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) AQU4~g
mI 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 X{o.mN 例如下所示: s<H0ka@ Sample name: EDF-C1-56 ,(}7 ST Merging data from file EDF-C1-56 0-0.txt >5#`j+8=q Finished merging RPC data for sample EDF-C1-56 kYl$V= FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt
pMYEL 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 EE#4,d`J a. 创建一个新的散射库 nM34zVy b. 散射模型命名 Z$kff-Y4 c. 改变散射模型为“Tabulated BSDF”. Xz4!#,z/ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 4Z"DF)+} e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 >,Zjlkh3 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, Aga2 I#1r g. 点击OK q-eC=!#} 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 kB_G L>fc 1mgLH #+|{l*> 脚本代码: |8c3%jve
vr/V_ '#Language "WWB-COM" n'v[[bmu YwQxN" Option Explicit ~t n*y4uK }RYr) Sub Main t@QaxZIlt; [!,&A{.! 'Cleanup >B U0B ClearOutputWindow() Mi,yg=V nZ>qM]">u Print "Merging RPC Photonics BSDF Data Files" HsGXb\ SetTextColor(255,0,0) Q}d6+ C Print "Note: Script should be located in the same folder as the BSDF TXT files." %N7b
XKDP Print "Note: Do not run this script multiple times without deleting the output file between executions." L&MR%5 SetTextColor(0,0,0) E#v}// lPSyFb" 'Current directory of this script (should be the same as the text files being merged) [U]U *x Dim cDir As String !JzM<hyg3 cDir = MacroDir$ & "\" qxf!]jm b4ZZyw 'Array which will be populated with the list of files to be merged A&jkc ' Dim fList() As String, curFile As String Ij` %'/J GetFileList( cDir, fList ) S3EY9:^C 8{#WF# Print "" V$VqYy9 * Print "Files found for merging:" M' e<\wqm For Each curFile In fList vP`Sz}FU Print Chr(9) & curFile zR6,?Tzg Next ~ P"@^cq f5"1WtB 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ^90';ACFy Dim nameArray() As String, sampName As String u)Y~+ [Q nameArray = Split(fList(0)," 0-0.txt") +%7v#CY
& sampName = nameArray(0) M(KsLu1
Print "" @)1>ba Print "Sample name: " & Chr(9) & sampName ,Md8A`7x~ SE.r 'J0 'Open an output file and write the FRED header data jzI70+E Dim outFile As String K'%2 'd outFile = cDir & sampName & "_FRED.txt" f(:+JH<P~ Open outFile For Output As #1 ?;zu>4f| Print #1, "type bsdf_data" FkY}6 Print #1, "format angles=deg bsdf=value scale=1" Q^prHn*@ Q@?8- 'Loop the file list, skip the two header lines and write the remaining data to file C]414Ibi Dim lineArray() As String, curLine As Long 3O7]~5 j1 For Each curFile In fList x? tC2L Print "Merging data from file " & curFile _8A ReadFile( cDir & curFile, lineArray ) U$v|c%6 For curLine = 2 To UBound(lineArray)
I{tY;b'w Print #1, lineArray(curLine) ]6L; Next :+NZW9_ Next 1AQVj]#S mivb}cKM 'Close the output file 6!zBLIYFI Close #1 uNCM,J!#~ ">cLPXX Print "Finished merging RPC data for sample " & sampName 3n;>k9{ Print "FRED formatted data file: " & Chr(9) & outFile ~k\Dde End Sub -{`8Av5)E% k#F | 'Utility function to read the contents of a file into an array of strings. Q,R>dkS Function ReadFile(ByVal fileName As String, _ F]e`-; ByRef lineArray() As String) As Long 7]W6\Z 60,z! Vv ReadFile = -1 %jk7JDvl Dim oFSO As Object x1H1[0w,i Set oFSO = CreateObject("Scripting.FileSystemObject") 'yxN1JF Erase lineArray m%m<-.'- [As9&]Bv5 Dim fid As Long Zc 9@G- If oFSO.fileexists( fileName ) Then Ak3cE_*Y/ fid = FreeFile() _PT5 Open fileName For Input As fid cq]JD6937 lineArray = Split(Input(LOF(fid), fid), vbCrLf) p3r("\Za, Close fid 9gq+,g>E_ End If 2[|52+zhc Set oFSO = Nothing m%zo? e Return UBound( lineArray ) Hb}O/G$a* ebno:) End Function SU,G0. QN47+)cVt" Sub GetFileList( ByVal in_dir As String, _ qm^|7m^ ByRef in_flist() As String ) %,T=|5 n(I,pF 'Redimension the file list array P5Lb)9_Jw Erase in_flist M~%P1@% #($~e| 'Tracks how many files are found '8J!(+ Dim fCount As Long $ UNC0(4 fCount = 0 .~$!BWP $%BI8_ 'Recurse directory and search for text files )<Fq}Q86 Dim f As String /RVwhA+c f = Dir$(in_dir & "*.txt") U#V&=~- While f <> "" UQZl:DYa ReDim Preserve in_flist(fCount) R
[ZY;g:p in_flist(fCount) = f K|pg'VT" fCount += 1 Q
XSS f = Dir$() FKZ'6KM&A Wend P ~ :
N ReDim Preserve in_flist(fCount-1) 6ChFsteGFr XHU\;TF End Sub 3rVfBz GP>\3@> O&dBLh!G QQ:2987619807 |`ya+/ff+
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