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摘要: xN*k&!1& cAN!5?D\ 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。 =DdPwr 0Op g|Lbe4? 背景: Pm%xX~H 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。 3t<a3"{9 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。 #e@NV4q 图1. RPC Photonics工程漫射体结构及光束投射形状 1Le8W)J mo^E8t. AE:(:U\ 步骤 Ue
\A , !L.R"8! 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。 dU3A:uS^ ymm]+v5S.] 图2. RPC Photonics工程漫射体不同类型的散射数据 jSpj6:@B 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) :!_l@ =l 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 M d4Q.8 例如下所示: lo!pslqsn Sample name: EDF-C1-56 zg ,=A? Merging data from file EDF-C1-56 0-0.txt *IOrv) Finished merging RPC data for sample EDF-C1-56 MiZ<v/L2 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ?1L<VL=b 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ^mLX}E] a. 创建一个新的散射库 7G+!9^ b. 散射模型命名 8=$X hC c. 改变散射模型为“Tabulated BSDF”. \0~?i6o d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ZP~H! e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 HN7tIz@Frc f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, QqQhQ GV g. 点击OK no8\Oees 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 oJD]h/fQs m]V#fRC E0I/]0 脚本代码: OH06{I>; .I>rX#aNt '#Language "WWB-COM" w4P;Z-Cd pyV`O[ Option Explicit ^B1Ft5F`b \i+AMduAo Sub Main c1E{J<pZ Q~(Qh_Ff 'Cleanup S"*k#ao ClearOutputWindow() nl}LT/N JOG-i Print "Merging RPC Photonics BSDF Data Files" Pd+*syOM SetTextColor(255,0,0) SZT n=\ Print "Note: Script should be located in the same folder as the BSDF TXT files." 0UJ6>Rj Print "Note: Do not run this script multiple times without deleting the output file between executions." VHPqEaR SetTextColor(0,0,0) SZXSVz0j PESvx>: 'Current directory of this script (should be the same as the text files being merged) b_`h2dUq Dim cDir As String K&&T:'=/ cDir = MacroDir$ & "\" v)np.j0V7 LCSvw 'Array which will be populated with the list of files to be merged ]*P9=!x|M Dim fList() As String, curFile As String Pl=)eq YY GetFileList( cDir, fList ) hdWV vN ~D@ YLW1z( Print "" &Z>??|f Print "Files found for merging:" +EjXoW7V For Each curFile In fList CKHmJ]= Print Chr(9) & curFile OK v2..8 Next f/c&Ya(D~ -ysNo4#e& 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Ej)7[ Dim nameArray() As String, sampName As String 3\4e{3$ nameArray = Split(fList(0)," 0-0.txt") cz,CL/rno sampName = nameArray(0) ZxSnqbyA* Print "" 4
. c1 Print "Sample name: " & Chr(9) & sampName }' tJc $! Y2tVq})! 'Open an output file and write the FRED header data S rH::-{ Dim outFile As String h! uyTgq outFile = cDir & sampName & "_FRED.txt" 2FaCrc/ Open outFile For Output As #1 x-c5iahp' Print #1, "type bsdf_data" Q>Klkd5( Print #1, "format angles=deg bsdf=value scale=1" ;6 W[%{ XYR
q"{Id 'Loop the file list, skip the two header lines and write the remaining data to file YvN]7tcb Dim lineArray() As String, curLine As Long m-$}'mEO For Each curFile In fList %\-E
R!b Print "Merging data from file " & curFile 1K#[Ef4 ReadFile( cDir & curFile, lineArray ) FRR05%K For curLine = 2 To UBound(lineArray) 5.ab/uk;M Print #1, lineArray(curLine) 1#cTk Next ;_SSR8uHv Next baD063P; VqvjOeCbH 'Close the output file L7{}`O/g7 Close #1 ~tWh6-:|{J ),vDn}> Print "Finished merging RPC data for sample " & sampName )V~=B] Print "FRED formatted data file: " & Chr(9) & outFile OQfFS+6 End Sub "`cN k26JZ y+k^CT/u 'Utility function to read the contents of a file into an array of strings. -a@e28Y Function ReadFile(ByVal fileName As String, _ {H(l"KuL ByRef lineArray() As String) As Long fQC{LcS sQA_ 6]` ReadFile = -1 OnE%D|Tq= Dim oFSO As Object a(6h`GHo Set oFSO = CreateObject("Scripting.FileSystemObject") q/zU'7%@ Erase lineArray >U`G3(#7S L!*+:L
DL Dim fid As Long w!H(zjv&( If oFSO.fileexists( fileName ) Then ?e6>dNw fid = FreeFile() XQn1B3k+ Open fileName For Input As fid e(/F:ZEh lineArray = Split(Input(LOF(fid), fid), vbCrLf) p%meuWV%5 Close fid &kzysv-_ End If 2#:p:R8I> Set oFSO = Nothing U!-Nx9 Return UBound( lineArray ) ]w>o=<?b v[|W\y@H/3 End Function ^wWbW&<Tg vTx>z\7q, Sub GetFileList( ByVal in_dir As String, _ jr0j0$BF ByRef in_flist() As String ) 11"r FZ 1D#-,#? 'Redimension the file list array JqMF9|{H Erase in_flist .e0)@}Jv8> Wgh@X B 'Tracks how many files are found 5\z<xpJ Dim fCount As Long uU3A,-{- fCount = 0 G`n
$A/9Q -!_8>r;Q4 'Recurse directory and search for text files =3(Auchl$Y Dim f As String `K5*Fjx f = Dir$(in_dir & "*.txt") T 'c39 While f <> "" wjl )yo$z ReDim Preserve in_flist(fCount) f0SrPc v in_flist(fCount) = f 3E*m.jX fCount += 1 :Q"|%#P f = Dir$() Gu~*ZKyJ Wend l~;>KjZg ReDim Preserve in_flist(fCount-1) i:aW
.QZ. xA(z/% End Sub
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