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摘要: ?AY596 `(.ue8T 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。 zE.4e&m%Z? /eR @&!D ' 背景: `Pl=%DR 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。 -<&"geJA 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。 .(;k]UP 图1. RPC Photonics工程漫射体结构及光束投射形状 c<JJuG Tjure]wQz z!Jce}mx 步骤 $Ry
NM2YI lKIHBi 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。 uK(+WA xNxIqq<k 图2. RPC Photonics工程漫射体不同类型的散射数据 k1-?2kf"{ 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) ,O
a) 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 g;]2'Rj 例如下所示: 5bmtUIj Sample name: EDF-C1-56 drtQEc>qT Merging data from file EDF-C1-56 0-0.txt ?WUE+(oH> Finished merging RPC data for sample EDF-C1-56 .M:,pw"S] FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt oL}FD !} 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 D zDt:.JZ a. 创建一个新的散射库 3L>V-RPi M b. 散射模型命名 N@)4H2_u \ c. 改变散射模型为“Tabulated BSDF”. @gX@mT" 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 ) MiOSSl}; 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。
mH?^3T 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, >y]YF3? g. 点击OK sFS_CyN!7 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 sMO3eNLn J_P2% b=C 2~]c`/M3 脚本代码: $$qhX]^~ _5y)m5I '#Language "WWB-COM" yx/:<^"-$ $g|g}>Sc Option Explicit O4$:
xjs 9,,v0tE Sub Main SxT:k,ji VCc4nn# 'Cleanup #lVVSrF,- ClearOutputWindow() 5gJQr%pS Y}f%/vus Print "Merging RPC Photonics BSDF Data Files" =
)(; SetTextColor(255,0,0) 1uy+'2[Z-D Print "Note: Script should be located in the same folder as the BSDF TXT files." Jge;/f!i Print "Note: Do not run this script multiple times without deleting the output file between executions." t5e(9Yhj SetTextColor(0,0,0) "sHD8TUX T_gW't>
'Current directory of this script (should be the same as the text files being merged) }:hdAZ+z Dim cDir As String l_}c[bAUu cDir = MacroDir$ & "\"
d;CD~s CF>NyY:_ 'Array which will be populated with the list of files to be merged 7x1jpQ- Dim fList() As String, curFile As String o^AK@\e:^Z GetFileList( cDir, fList ) C(gH}N4 8o4
vA, Print "" ^rxXAc[ Print "Files found for merging:" 7qh_URt@ For Each curFile In fList !A<?nz
Uv Print Chr(9) & curFile %OzxR9 Next b9\=NdyCY ]AfeaU'> 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Ig9$ PP+3 Dim nameArray() As String, sampName As String f:HRrKf9 nameArray = Split(fList(0)," 0-0.txt") r\em-%: sampName = nameArray(0) g4~{#P^i Print "" 4ci
@$nL1 Print "Sample name: " & Chr(9) & sampName `Y'}\>.# pRYt.}/K 'Open an output file and write the FRED header data r?[Zf2& Dim outFile As String Q4Cw{2r outFile = cDir & sampName & "_FRED.txt" (s\Nm_j Open outFile For Output As #1 $)PNf'5Zg Print #1, "type bsdf_data" /)v X|qtIY Print #1, "format angles=deg bsdf=value scale=1" L]9*^al $@DXS~UQA 'Loop the file list, skip the two header lines and write the remaining data to file zR]l2zL3 Dim lineArray() As String, curLine As Long
5)mn For Each curFile In fList A2htD!3 Print "Merging data from file " & curFile C/lpSe ReadFile( cDir & curFile, lineArray ) C~kw{g+| For curLine = 2 To UBound(lineArray) UXe @c@3 Print #1, lineArray(curLine) |nv8&L8 Next ^F_c' Next WG1x:,- o_jVtEP 'Close the output file k`xPf\^tf Close #1 ql^n=+U 0(HUy`]> Print "Finished merging RPC data for sample " & sampName 8*6U4R Print "FRED formatted data file: " & Chr(9) & outFile [N.4i"
Cd End Sub C+jlIT+ G4]T 'Utility function to read the contents of a file into an array of strings. sF f@> Function ReadFile(ByVal fileName As String, _ AvH^9zEE( ByRef lineArray() As String) As Long :[,-wZiT~6 }cEcoi<v! ReadFile = -1 }~y
i6!w' Dim oFSO As Object t#=W'HyW8 Set oFSO = CreateObject("Scripting.FileSystemObject") ?7*.S Lt Erase lineArray ?s6v>#H% -LhO
</l Dim fid As Long jH({Qc,97 If oFSO.fileexists( fileName ) Then xG/B$DLn fid = FreeFile() `1{Y9JdQ Open fileName For Input As fid 9$$dSN\& lineArray = Split(Input(LOF(fid), fid), vbCrLf) "m4._4U Close fid )[+82~F End If GRM6H|. Set oFSO = Nothing ^CO{86V Return UBound( lineArray ) uGOED-@ ^m~&2l\N= End Function hK+6S3-Ez jVi>9[rz Sub GetFileList( ByVal in_dir As String, _ 4a}[&zm(5 ByRef in_flist() As String ) @QteC@k ' Dp;fEU$ 'Redimension the file list array @GUlw[vi Erase in_flist h?[|1.lJx( Co>e<be%S 'Tracks how many files are found ;NU-\<Q{ Dim fCount As Long <aztbq? fCount = 0
b:Z&;A|"{ i/j53towe 'Recurse directory and search for text files \?Sv O Dim f As String J3 `0i@ f = Dir$(in_dir & "*.txt") ])}a^]0q While f <> "" jr,N+K(@T ReDim Preserve in_flist(fCount) nr2 Q[9~ in_flist(fCount) = f $=iw<B r fCount += 1 Q$uv
\h; f = Dir$() y];-D>jk Wend {`QA.he. ReDim Preserve in_flist(fCount-1) Aa=:AkrH l+[:Cni End Sub Z:dp/M}
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