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摘要: bGZhUEq /*u#Ba<< 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。 vF9*tK' 5nM kd/ 背景: l5FuMk- 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。 L!bfh` 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。 qpb/g6g 图1. RPC Photonics工程漫射体结构及光束投射形状 M|/oFV .abyYVrN4? m0=cMVCA! 步骤 5z1\#" B[ cJxW;WI!, 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。
OD FjD,8^SQW 图2. RPC Photonics工程漫射体不同类型的散射数据 ;\<""Yj@l 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) p//T7rs 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 lo cW_/ 例如下所示: ! 9d_Gf- Sample name: EDF-C1-56 ~gu=x&{ Merging data from file EDF-C1-56 0-0.txt y=[gQJ6~r Finished merging RPC data for sample EDF-C1-56 W3De|V^ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt SV$nyV
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 i/NDWVFD a. 创建一个新的散射库 _^_5K(Uq b. 散射模型命名 r0)JUc}Fyq c. 改变散射模型为“Tabulated BSDF”. 6yE'/VB< 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 ) O {PW 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。 f"vk# 3 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, _,DO~L g. 点击OK }sf YCz 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 }TSgAwsbC Kb^>X{ ^ Xm/ 脚本代码: mfZ)^X ,%A)"doaG '#Language "WWB-COM" :~vxZ*a ?Fce!J Option Explicit X6Un;UL uc 'p]WhQ Sub Main +C'XS{K,# `-4'/~G 'Cleanup (jMtN?&0H- ClearOutputWindow() DH:J dw~[9oh Print "Merging RPC Photonics BSDF Data Files" ypH8QfxLTr SetTextColor(255,0,0) (VR"Mi4 Print "Note: Script should be located in the same folder as the BSDF TXT files." |)9thIQF Print "Note: Do not run this script multiple times without deleting the output file between executions." #S%4? SetTextColor(0,0,0) G@9u:\[l $50\"mo~z 'Current directory of this script (should be the same as the text files being merged) @!e~G'j%VD Dim cDir As String os[ZIHph cDir = MacroDir$ & "\" E(_KN[}S @c Z\*,T 'Array which will be populated with the list of files to be merged VKy5=2& Dim fList() As String, curFile As String auRY|j GetFileList( cDir, fList ) /?Vdqci eI^gV'UK Print "" &M[MEO`t8 Print "Files found for merging:" ?KCivf For Each curFile In fList )u0O_R Print Chr(9) & curFile fe|g3>/| Next hd5$ yU5JQ 'f*O#&? 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. s
D_G)c Dim nameArray() As String, sampName As String COSTV>s; nameArray = Split(fList(0)," 0-0.txt") Tp?-*K sampName = nameArray(0) #,&8& Print "" lkb2?2\+ Print "Sample name: " & Chr(9) & sampName Z ] '> .Rvf/-e 'Open an output file and write the FRED header data 34z+INkX Dim outFile As String 4@6< outFile = cDir & sampName & "_FRED.txt" T^]7R4Fg Open outFile For Output As #1 ?W!ry7gXO Print #1, "type bsdf_data" !4t`Hv?' Print #1, "format angles=deg bsdf=value scale=1" \]8VwsP 'd/*BjNp) 'Loop the file list, skip the two header lines and write the remaining data to file Q ]"jD#F Dim lineArray() As String, curLine As Long 4d`+CD C For Each curFile In fList G6V/S aD Print "Merging data from file " & curFile 9OyN i ReadFile( cDir & curFile, lineArray ) ]v\^&7pW For curLine = 2 To UBound(lineArray) XFQNr` Print #1, lineArray(curLine) H-,TS^W Next )t%h[0{{ Next @r<b:?u Qs l80~n_7 'Close the output file /;l[I=VI Close #1 hbI;Hd rLzW` Print "Finished merging RPC data for sample " & sampName >aG= T{ Print "FRED formatted data file: " & Chr(9) & outFile t`YWwI. End Sub ,[X_]e;
O9^T3~x[V 'Utility function to read the contents of a file into an array of strings.
WK==j1 Function ReadFile(ByVal fileName As String, _ XQ?fJWLU
ByRef lineArray() As String) As Long )3%@9 ,?(ciO) ReadFile = -1 % :/_ f Dim oFSO As Object 8eJE>g1J Set oFSO = CreateObject("Scripting.FileSystemObject") Ie@Jb{x Erase lineArray Uw)=WImz[ YJ,*(A18 Dim fid As Long ?#BV+#( If oFSO.fileexists( fileName ) Then sn"fK=,#g fid = FreeFile() O~PChUU*Y Open fileName For Input As fid Yw)Fbt^ lineArray = Split(Input(LOF(fid), fid), vbCrLf) xE1'&!4O Close fid /e1(?
20 End If s bnjy"Z% Set oFSO = Nothing I^_NC&m Return UBound( lineArray ) zkexei4^< G\=_e8( End Function | -+zofx $UvPo0{ Sub GetFileList( ByVal in_dir As String, _ !^WHZv4 ByRef in_flist() As String ) P!e= b-T OlY$v@| 'Redimension the file list array <a|@t@R Erase in_flist %e?fH.) ~3CVxbB^< 'Tracks how many files are found @AQwr#R"l Dim fCount As Long .Djta|puu fCount = 0 4 1t)(+r PeTA$Yl 'Recurse directory and search for text files Qxa{UQh}9 Dim f As String Sh&PNJ-* f = Dir$(in_dir & "*.txt") ->gZ)?Fqy While f <> "" gU;&$ ReDim Preserve in_flist(fCount) 7\Fs=\2l+' in_flist(fCount) = f I ~$1Lu`~ fCount += 1 ;ME)Og f = Dir$() JOD/Raq.1k Wend obo&1Uv,/ ReDim Preserve in_flist(fCount-1) ~h)&&'a (9C<K< End Sub mLyBm 8P2 J2IU _#C()Ro*P QQ:2987619807 +L%IG
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