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摘要: #M%K82" }*
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3 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。 h ;@c%Vm C}#$wge
背景: wn^#`s!]U Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 {dXTj 7 FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 2x>7>;> 图1. RPC Photonics工程漫射体结构及光束投射形状 -Bl]RpHCe fy]c=:EmD 2X<%BFsE 步骤 |kH.o= SJ91(K 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 'hE'h?-7 a:8 MoH 4 图2. RPC Photonics工程漫射体不同类型的散射数据 cZJ5L>ox 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) =A!rZG 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 8>@JW] 例如下所示: lb$_$+@Vr Sample name: EDF-C1-56 RL:B.Lv/W Merging data from file EDF-C1-56 0-0.txt )X;051Q Finished merging RPC data for sample EDF-C1-56 /oW]? 9 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 06O_!"GD} 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ZNne 8 a. 创建一个新的散射库 9dw*
++ b. 散射模型命名 c<, LE@V c. 改变散射模型为“Tabulated BSDF”. c7~R0nP d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ]J [d8S5 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 .uVd' f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, a2Nxpxho g. 点击OK =[8K#PZ$w 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 U(0FL6sPC $|xSM2 HdgNy \ 脚本代码: 7nNNc[d*= d!w3LwZ '#Language "WWB-COM"
`!t-$i F)KR8( Option Explicit 0PqI^|! 'da
'WZG Sub Main V*ao@;sD od{\z 'Cleanup &&m3E=K!^ ClearOutputWindow() e@qH!.g) 'B{FRK Print "Merging RPC Photonics BSDF Data Files" ]iGeqwT SetTextColor(255,0,0) E_En"r)y Print "Note: Script should be located in the same folder as the BSDF TXT files." `<yQ`Y_X Print "Note: Do not run this script multiple times without deleting the output file between executions." F$(ak;v} SetTextColor(0,0,0) l 9
wO x #GLW3} 'Current directory of this script (should be the same as the text files being merged) hVmnXT
3Z Dim cDir As String mE`qA*=? cDir = MacroDir$ & "\" M,S'4Szuk RYA@{.O 'Array which will be populated with the list of files to be merged $:%E<j4Dn Dim fList() As String, curFile As String v+"4YIN GetFileList( cDir, fList ) z4:<?K A$r$g\5+ Print "" JC%&d1
Print "Files found for merging:" /ZD 6pF For Each curFile In fList H)i|?3Ip Print Chr(9) & curFile iX6>u4~( Next &n
)MGg1% Go)g}#.& 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. *s*Y uY%y Dim nameArray() As String, sampName As String ,bXZ<RY$ nameArray = Split(fList(0)," 0-0.txt") F^'$%XK V sampName = nameArray(0) i? ~-% Print "" VK]U* V1 Print "Sample name: " & Chr(9) & sampName \OA{&G. l>}f{az-T 'Open an output file and write the FRED header data nV7Vc; Dim outFile As String _ Lb"yug outFile = cDir & sampName & "_FRED.txt" #'q7 x Open outFile For Output As #1 7Vsp<s9bj Print #1, "type bsdf_data" oD V6[e Print #1, "format angles=deg bsdf=value scale=1" E{&MmrlL, X0u,QSt'O 'Loop the file list, skip the two header lines and write the remaining data to file .Zczya Dim lineArray() As String, curLine As Long IGcq*mR= For Each curFile In fList q:/df]Ntt Print "Merging data from file " & curFile dv>n38&mDQ ReadFile( cDir & curFile, lineArray ) UMR ?q0J For curLine = 2 To UBound(lineArray) }a||@unr Print #1, lineArray(curLine) +q}t%K5 Next M&j|5UH%. Next az6& lb.Q^TghU 'Close the output file 7Hr_ZwO/^ Close #1 (MI>7| '; :rUMmO - Print "Finished merging RPC data for sample " & sampName k?14'X*7yu Print "FRED formatted data file: " & Chr(9) & outFile 80*hi)ux[
End Sub cx$IWQf2 3$nK
'Utility function to read the contents of a file into an array of strings. Sp80xV_B Function ReadFile(ByVal fileName As String, _ Y/kq!)u;%L ByRef lineArray() As String) As Long x/umwT,o v D#b*M)X" ReadFile = -1 \;)g<TwL Dim oFSO As Object E7fQ9] Set oFSO = CreateObject("Scripting.FileSystemObject") a)JXxst Erase lineArray =Z fz=?QEG Dim fid As Long #m.e9MU If oFSO.fileexists( fileName ) Then }_]AQN$'G fid = FreeFile() TC?B_;a Open fileName For Input As fid C7FQc{ lineArray = Split(Input(LOF(fid), fid), vbCrLf) sQa;l]O:NC Close fid D=-}&w_T" End If @gD)pH Set oFSO = Nothing LpU}. Return UBound( lineArray ) [yXmnrxA B-Jd|UE`u End Function `FMo;,j 'w+]kt- Sub GetFileList( ByVal in_dir As String, _ {h?pvH_> ByRef in_flist() As String ) XMuZ}u[U B$_4ul\) 'Redimension the file list array JpC'(N Erase in_flist b#
N"}-\^ ( 2HM"Pd 'Tracks how many files are found {Yj5Mj|# Dim fCount As Long 2!^=G=H/ fCount = 0 b_31 \ pbzFzLal 'Recurse directory and search for text files `I5^zi8 Dim f As String fHup&|. f = Dir$(in_dir & "*.txt") /|
v.A\: While f <> "" Jj-\Eb? ReDim Preserve in_flist(fCount) OyZR&,q in_flist(fCount) = f =Z^5'h~ fCount += 1 DXLXGvcM f = Dir$() N)X Tmh2v| Wend r<UVO$N ReDim Preserve in_flist(fCount-1) k&dXK ,MCTb '=G End Sub z'q~%1t
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