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摘要: iG-N VK4/82@5 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。 qY}Cg0[@g plku-O;] 背景: tp+=0k2i 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。 M:|/ijpN 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。 /co%:}ln 图1. RPC Photonics工程漫射体结构及光束投射形状 )>$^wT d pn3 ( d
Uz<1^L 步骤 UPO^V:.R4 X%`KYo% 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 ewQe/Fq hho%~^bn( 图2. RPC Photonics工程漫射体不同类型的散射数据 nP
u`;no 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 0BXs&i-TP5 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 A\g% 例如下所示: vzy!3Hiw Sample name: EDF-C1-56 Y- ~;E3( Merging data from file EDF-C1-56 0-0.txt uQ1jwYK`7 Finished merging RPC data for sample EDF-C1-56 E0jUewG FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt "G kI5! 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 xN"wF-s4? a. 创建一个新的散射库 `oPLl0 b. 散射模型命名 O\JD, w c. 改变散射模型为“Tabulated BSDF”. m+7`\|`jQ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) T^NJ4L4# e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 9<Ag1l f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, TK %<a/ g. 点击OK id4]|jb 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 F,.Q|.nN 3.~h6r5- x
Ty7lfSe 脚本代码: N1s.3` #'iPDRYy '#Language "WWB-COM" c.-cpFk^L& `$f2eB& Option Explicit iP,v=pS6 4JSZ0:O Sub Main &/DOO ^ ooDdV
> 'Cleanup 8.-S$^hj~6 ClearOutputWindow() &58 { rFO_fIJno Print "Merging RPC Photonics BSDF Data Files" ;x16shH
SetTextColor(255,0,0) K+-z Y[3 Print "Note: Script should be located in the same folder as the BSDF TXT files." H}a)^90_ Print "Note: Do not run this script multiple times without deleting the output file between executions." n5 >B LtY SetTextColor(0,0,0) _y"a2M WN1Jm:5YV 'Current directory of this script (should be the same as the text files being merged)
"Ac~2<V Dim cDir As String ZGzc"r(r:# cDir = MacroDir$ & "\" d["x=
[f EqoASu 'Array which will be populated with the list of files to be merged 1oB$u!6P Dim fList() As String, curFile As String *F|i&2 GetFileList( cDir, fList ) /t$*W\PL@ q$|0)} Print "" >^;(c4C Print "Files found for merging:" r:.6"VQu} For Each curFile In fList "B~WcC Print Chr(9) & curFile yW{mK Next NQg'|Pt(% &b!vWX1N 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. U-1VnX9m Dim nameArray() As String, sampName As String a" ^#!G<+ nameArray = Split(fList(0)," 0-0.txt") QYH."7X
> sampName = nameArray(0) u*U_7Uw$ Print "" LH,]vuXh Print "Sample name: " & Chr(9) & sampName ,T/GW,? "2%y~jrDN 'Open an output file and write the FRED header data r)c+".0d^ Dim outFile As String {[my"n2 outFile = cDir & sampName & "_FRED.txt" F68},N>vr@ Open outFile For Output As #1 F:M/z#:~ Print #1, "type bsdf_data" :&qC <UD Print #1, "format angles=deg bsdf=value scale=1" 5"$e=y/ $]nVr(OZ_ 'Loop the file list, skip the two header lines and write the remaining data to file ]&' jP Dim lineArray() As String, curLine As Long F9v)R#u~ For Each curFile In fList =obt"K%n Print "Merging data from file " & curFile ?ISI[hoc ReadFile( cDir & curFile, lineArray ) ;,mBT[_ZO For curLine = 2 To UBound(lineArray) W;q#ZD(; Print #1, lineArray(curLine) 8I<_w4fC Next =jsx(3V Next YGfA qI
y h\/^Aa0 'Close the output file yB
1I53E Close #1 zoR,RBU6 2;3x,<Cg Print "Finished merging RPC data for sample " & sampName BN_!Y)Fl Print "FRED formatted data file: " & Chr(9) & outFile <zfO1~^ End Sub b=V)?"e- jkZ_c! 'Utility function to read the contents of a file into an array of strings. mgk64}K [n Function ReadFile(ByVal fileName As String, _ r(PJ~8)(= ByRef lineArray() As String) As Long Z`^
K%P= f&=K]:WDe ReadFile = -1 v!nm
&" Dim oFSO As Object _e;N'DZ Set oFSO = CreateObject("Scripting.FileSystemObject") H<v c\r Erase lineArray -[G/2F' yW%&_s0 Dim fid As Long j@%K*Gb` If oFSO.fileexists( fileName ) Then Fsnw3/Nr fid = FreeFile() 7^n,Tig Open fileName For Input As fid Z'voCWCd lineArray = Split(Input(LOF(fid), fid), vbCrLf) ;%v%K+}r Close fid
Tbe_xs^ End If ac2}3$u Set oFSO = Nothing C}x4#bNK Return UBound( lineArray ) ]R97n|s_ pI'8>_o End Function #k"1wSx16 _Jf J%YXy Sub GetFileList( ByVal in_dir As String, _ 71K\.[ =- ByRef in_flist() As String ) jXc5fXO
N _Cu[s?,kS 'Redimension the file list array }T?i%l Erase in_flist XMjI}SPG !O 0ZD4/{4 'Tracks how many files are found *5ka.=Qs Dim fCount As Long Yt\E/*% fCount = 0 6^7)GCq [ c.|sW2/ 'Recurse directory and search for text files -0=}|$H. Dim f As String =g{_^^n f = Dir$(in_dir & "*.txt") >qSO,$ While f <> "" q$e
T!'x ReDim Preserve in_flist(fCount) O JZ!|J8? in_flist(fCount) = f BsoFQw4$9 fCount += 1 7AZ5%o f = Dir$() AlPL;^Y_l Wend 9'L1KQ ReDim Preserve in_flist(fCount-1) O[i2A( O+CF/ipX/ End Sub eukX#0/^ r< d? }'@tA")-) QQ:2987619807 5Ws:Ei{R
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