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摘要: iz9\D*or FYXw$7'l RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 z{`6# ?@lx 背景: >w2Q1! Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 `CAG8D FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 2Ft8dfdm` 图1. RPC Photonics工程漫射体结构及光束投射形状 !c4)pMd wuIsO;}/9 `i t+D 步骤 462!;/y ;# R3k 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 MK-a$~< Evr2|4|O~ 图2. RPC Photonics工程漫射体不同类型的散射数据 #aitESbT 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) BN\fv, 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 nW$A^ 例如下所示: &\"Y/b] Sample name: EDF-C1-56 [}A_uOGEP Merging data from file EDF-C1-56 0-0.txt ){O1&|z- Finished merging RPC data for sample EDF-C1-56 i!SW?\ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ;OQ'B=uK 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Jw:Fj{D a. 创建一个新的散射库 pAJ=f}",]E b. 散射模型命名 M>?aa6@0 c. 改变散射模型为“Tabulated BSDF”. k_*XJ <S!Y d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) I%;Rn:zl e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ilDJwZg# f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ->&BcPLn g. 点击OK Xzx[C_G 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Yl)eh(\&J TnN^2:cU (j8GiJ]{L, 脚本代码: Ud>`@2 (MgL"8TS '#Language "WWB-COM" tk`: CT
* F-$Z,Q]S Option Explicit xZ^ywa_ ?vZWUWa Sub Main 'v'`
F*6 PU^[HC*K 'Cleanup gq
H`GI ClearOutputWindow() F3r S6_ %'{V%IXQ Print "Merging RPC Photonics BSDF Data Files" I$aXnd6) SetTextColor(255,0,0) Q?*
nuE Print "Note: Script should be located in the same folder as the BSDF TXT files." u{g]gA8s Print "Note: Do not run this script multiple times without deleting the output file between executions." *TJBPM, SetTextColor(0,0,0) {[Uti^)m% "[awmZ:wo 'Current directory of this script (should be the same as the text files being merged) I`/]@BdgY Dim cDir As String a<f;\$h] cDir = MacroDir$ & "\" vx04h ~ Y[f,ia 'Array which will be populated with the list of files to be merged m3U+ du Dim fList() As String, curFile As String Xy[}G p GetFileList( cDir, fList ) ?D1x;i9< `[X6#`< Print "" S8*^ss>?^R Print "Files found for merging:" AU0$A403 For Each curFile In fList S#P+B*v Print Chr(9) & curFile utq.r_ Next (YAI,Xnw uAp
-$? 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. hA@zoIoe Dim nameArray() As String, sampName As String GMEw nameArray = Split(fList(0)," 0-0.txt") `ajx hp sampName = nameArray(0) H!Wis3S3G Print "" $TR=3[j Print "Sample name: " & Chr(9) & sampName HMF8;,<_w? f8^"E $" 'Open an output file and write the FRED header data J=@hk@Nq# Dim outFile As String /r>IV`n{ outFile = cDir & sampName & "_FRED.txt" kXigX- Open outFile For Output As #1 M,&tA1CH Print #1, "type bsdf_data" grGhN q Print #1, "format angles=deg bsdf=value scale=1" HpW"lYW4 ~@xT]D!BQ 'Loop the file list, skip the two header lines and write the remaining data to file qO7fbql_ Dim lineArray() As String, curLine As Long l &}piC For Each curFile In fList 0xN!DvCg>. Print "Merging data from file " & curFile +z+F- ReadFile( cDir & curFile, lineArray ) 7Aqn[1{_O For curLine = 2 To UBound(lineArray) XxhsPFv Print #1, lineArray(curLine) =\M)6"}y} Next :b"=KQ Next I9;xz ES "Lb fF 'Close the output file |B
9t- Close #1 K-Re"zsz NK 8<=
n%" Print "Finished merging RPC data for sample " & sampName [C~fBf5 Print "FRED formatted data file: " & Chr(9) & outFile ,cLH*@ End Sub 7@JjjV bdCykG- 'Utility function to read the contents of a file into an array of strings. 0%/,>IR>r Function ReadFile(ByVal fileName As String, _ B@d1xjp)'] ByRef lineArray() As String) As Long E\ tL 64SW ReadFile = -1 ^#2xQ5h Dim oFSO As Object '[%jjUU Set oFSO = CreateObject("Scripting.FileSystemObject") d60c$?"]a( Erase lineArray 2v4W6R N5yJ'i~,M Dim fid As Long X|,["Az
8 If oFSO.fileexists( fileName ) Then 5Wo5n7o fid = FreeFile() ;;M"hI3@ Open fileName For Input As fid \Ps5H5Qk; lineArray = Split(Input(LOF(fid), fid), vbCrLf) -=5EbNPwG Close fid xF&6e&nv End If vlvvi() Set oFSO = Nothing Z A [ ) Return UBound( lineArray ) {y1q7Z.M w"1x=+ End Function kY=rz&?U
P`tyBe#= Sub GetFileList( ByVal in_dir As String, _ |hc\jb ByRef in_flist() As String ) 0Yp>+:# *-6? 'Redimension the file list array M%3Wy"YQ,n Erase in_flist w#sq'vo4% Oc#>QZ3 'Tracks how many files are found 0iF -}o Dim fCount As Long S.1(3j* fCount = 0 6s5yyy=L%~ wE?CvL 'Recurse directory and search for text files g@Ld"5$^2 Dim f As String #,TELzUVE f = Dir$(in_dir & "*.txt") ZvH?3Jy While f <> "" ,[Ag~.T ReDim Preserve in_flist(fCount) zz&vfO31J in_flist(fCount) = f C!5I?z& fCount += 1 f9a$$nb3` f = Dir$() 0Q`&inwh Wend Xo\S9,s{ ReDim Preserve in_flist(fCount-1) <1K7@Tu w763zi{ End Sub R#ya,L sCkO0dl8 M1EOnq4- QQ:2987619807 Y([d;_#P
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