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摘要: rvic%bsk
="\*h( 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。 b,dr+RB 6xarYh( 背景: )1f+ld%R 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。 cC%j!8! 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。 3 > |uF 图1. RPC Photonics工程漫射体结构及光束投射形状 vM`7s[oAK KmQ^?Ad-C O)uOUB 步骤 !hCS#' lkA^\+Ct 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。 _gW{gLYyJ K\P!a@>1 图2. RPC Photonics工程漫射体不同类型的散射数据 vZ@g@zB4o0 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) *69c-`o 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 $n-Af0tK 例如下所示: D{p5/#|r Sample name: EDF-C1-56 HzvlF0f Merging data from file EDF-C1-56 0-0.txt e .l!3xY2' Finished merging RPC data for sample EDF-C1-56 "Sjr_!u FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt CWi8Fv 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 }c%
pH{HI a. 创建一个新的散射库 ;/'|WLI9 b. 散射模型命名 QHzgy? c. 改变散射模型为“Tabulated BSDF”. FLZS K:3B] d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) T%(C-Quh e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 QU T"z' f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ;cKH1 g. 点击OK cy|%sf` 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ?TpUf CISO<z0 d(7NO;S8 脚本代码: h^oH^moq< %d;<2b0 '#Language "WWB-COM" B
+Aj*\Y. k_aW Option Explicit !msNEE@[ | o0RP|l Sub Main i#W*' lb~E0U`\E` 'Cleanup l -.(Ez* ClearOutputWindow() Zx{96G+1 /L v1$~ Print "Merging RPC Photonics BSDF Data Files" V8PLFt; SetTextColor(255,0,0) 3o6RbW0[
Print "Note: Script should be located in the same folder as the BSDF TXT files." 6/tI8H3E Print "Note: Do not run this script multiple times without deleting the output file between executions." ? \m3~6y SetTextColor(0,0,0) 8W+5)m.tp #NN ewzC<* 'Current directory of this script (should be the same as the text files being merged) =o^|b ih Dim cDir As String CO^Jz cDir = MacroDir$ & "\" 3`F) AWzdr mfom=-q3k 'Array which will be populated with the list of files to be merged :%X Ls, Dim fList() As String, curFile As String n~g LPHY GetFileList( cDir, fList ) s8<gK.atl w%a8XnW]1 Print "" x /mp=
Print "Files found for merging:" YF[f Z For Each curFile In fList +(?>-3_z Print Chr(9) & curFile qOy=O
[+9 Next qp p/8M u[oUCTY 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. +?m0Q;%b Dim nameArray() As String, sampName As String 1n=_y o nameArray = Split(fList(0)," 0-0.txt") UMMB0(0D sampName = nameArray(0) >v+jh(^ Print "" +K~NV?c Print "Sample name: " & Chr(9) & sampName |/`%3'4H e3[:D5 'Open an output file and write the FRED header data OCV+h' Dim outFile As String ?jO 5 9n outFile = cDir & sampName & "_FRED.txt" r&3pM2Da} Open outFile For Output As #1 OB-Q /?0 Print #1, "type bsdf_data" QM<y`cZ8 Print #1, "format angles=deg bsdf=value scale=1" /rc%O*R r8/l P}(F 'Loop the file list, skip the two header lines and write the remaining data to file kH948<fk3 Dim lineArray() As String, curLine As Long M+P$/Wk For Each curFile In fList [A2`]CE<@ Print "Merging data from file " & curFile SOf{Hx0C6 ReadFile( cDir & curFile, lineArray ) {~Tg7<\L For curLine = 2 To UBound(lineArray) uJU*")\V Print #1, lineArray(curLine) sLL7]m} Next 'UU\4M Next :t("L-GPW ~I=Y{iM 'Close the output file FnFb[I@eu Close #1 TQ@d~GR PWr(*ZP>hI Print "Finished merging RPC data for sample " & sampName R^#@lI~ Print "FRED formatted data file: " & Chr(9) & outFile ]lO h&Cz[ End Sub 3_$w|ET MCTsi:V>+ 'Utility function to read the contents of a file into an array of strings. ~x:DXEV, Function ReadFile(ByVal fileName As String, _ Orn0Zpp<z ByRef lineArray() As String) As Long Cby;?F6w |N /G'>TS ReadFile = -1 iq$$+y, Dim oFSO As Object 0&+k.Vg Set oFSO = CreateObject("Scripting.FileSystemObject") .Ajzr8P Erase lineArray 6IcNZ!j98 `:NaEF?Sj Dim fid As Long G3i !PwW If oFSO.fileexists( fileName ) Then 0%Ll fid = FreeFile() */qtzt Open fileName For Input As fid y046:@v( lineArray = Split(Input(LOF(fid), fid), vbCrLf) xw5d|20b Close fid !^oV # End If tRb]7 z Set oFSO = Nothing C4$:mJ>y Return UBound( lineArray ) k%c{ETdE N2r/ho}8 End Function rqPo)AL sic"pn],U Sub GetFileList( ByVal in_dir As String, _ <xpph
t< ByRef in_flist() As String ) o G*5f :ue:QSt(u 'Redimension the file list array }|OaL*|u Erase in_flist &)wiKh"$ nQX+pkJ 'Tracks how many files are found zE T^T5>: Dim fCount As Long {P%9 fCount = 0 HAz By\M{ f5*k7fg 'Recurse directory and search for text files ;ea]$9 Dim f As String Qj{8?lew f = Dir$(in_dir & "*.txt") !^#jwRpeN While f <> "" &F:IIo7 ReDim Preserve in_flist(fCount) O|IG_RL] in_flist(fCount) = f GYxM0~:$k fCount += 1 v4,h&JLt f = Dir$() 5@IB39 Wend "xI" ReDim Preserve in_flist(fCount-1) GE;e]Jkjn ?liK\C2Z< End Sub <P[T!gST
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