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摘要: Q@UY4gA' UX'tdB
!A 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。 ,k/<Nv; ] m^ECA$ 背景: ]JI
A\|b6 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。 ;!>>C0s" 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。 rX&?Xi1JeV 图1. RPC Photonics工程漫射体结构及光束投射形状 =iPQ\_ON@ cuQ=bRIb WJ]g7!Ks 步骤 m3_)UIJZ 8L(KdDY 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。 5{8,+
Z &44?k: 图2. RPC Photonics工程漫射体不同类型的散射数据 :.\h.H; 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) GJuU?h#:/{ 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 H0mDs7 例如下所示: e9?y0vT// Sample name: EDF-C1-56 3bB%@^< Merging data from file EDF-C1-56 0-0.txt kc:2ID& Finished merging RPC data for sample EDF-C1-56 h$fC/Juit FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt gJBk&SDgtP 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,[Z;"wE a. 创建一个新的散射库 >(a/K2$*1 b. 散射模型命名 2E3x= c. 改变散射模型为“Tabulated BSDF”. q]t^6m&- 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 ) .w]S!=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。 J7rfHhz 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, <8/lHQ^\) g. 点击OK S8Yh>j8- 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 iD9hqiX& ZsYT&P2 R2[!h1nZ 脚本代码: }L*cP;m# ZpY"P6 '#Language "WWB-COM" LIHf]+ uM~j Option Explicit cj/FqU" K?+Rq Sub Main :YZMRJL n7Ia8?8-l 'Cleanup c}FZb$q# ClearOutputWindow() :dzamHbX9 <$
Ar*<,6 Print "Merging RPC Photonics BSDF Data Files" c^8y/wfok SetTextColor(255,0,0) }'
t*BaU Print "Note: Script should be located in the same folder as the BSDF TXT files." (wIpq<% Print "Note: Do not run this script multiple times without deleting the output file between executions." [VP~~*b SetTextColor(0,0,0) ffYiu4$m NASRr 'Current directory of this script (should be the same as the text files being merged) ysiBru[u
Dim cDir As String =>6'{32W_ cDir = MacroDir$ & "\" XX(;,[(_ ,*Yu~4 'Array which will be populated with the list of files to be merged [(N<E/m %B Dim fList() As String, curFile As String etH%E aF[ GetFileList( cDir, fList ) r
yO\$m ^T|~L<A3 Print "" ;=6~,k) Print "Files found for merging:" bXiT}5mJU For Each curFile In fList Sf\mg4, Print Chr(9) & curFile I(Yyg,1Z Next #X"eg OsR4oT 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. lH ^[b[ Dim nameArray() As String, sampName As String gI^*O@Q4{b nameArray = Split(fList(0)," 0-0.txt") o3l_&?^ sampName = nameArray(0) U.G** v Print "" !}^{W)h[ Print "Sample name: " & Chr(9) & sampName ]f q.r .Eg>) 'Open an output file and write the FRED header data LdAfY0 Dim outFile As String v7/qJ9l outFile = cDir & sampName & "_FRED.txt" `:A`%Fg8< Open outFile For Output As #1 !285=cxz Print #1, "type bsdf_data" yggQ4y6 Print #1, "format angles=deg bsdf=value scale=1" X&6p_Lo _S#uxgL< 'Loop the file list, skip the two header lines and write the remaining data to file Hay`lA2@ Dim lineArray() As String, curLine As Long ?8n`4yO0 For Each curFile In fList B@l/'$G Print "Merging data from file " & curFile ,!3G ReadFile( cDir & curFile, lineArray ) 7!`,P For curLine = 2 To UBound(lineArray) u%S&EuX Print #1, lineArray(curLine) Q': }'CI Next ,xrXby|R" Next *O|Z[> X/TuiKe 'Close the output file PK5xnT: Close #1 ^~2GhveBV ".eD&oX{ Print "Finished merging RPC data for sample " & sampName 2mbZ6'p { Print "FRED formatted data file: " & Chr(9) & outFile ?*a:f"vQ End Sub %uyRpG3, 40oRO0p 'Utility function to read the contents of a file into an array of strings. ajW[}/) Function ReadFile(ByVal fileName As String, _ tm(.a?p ByRef lineArray() As String) As Long 2*5Z|
3aX _rK}~y=0 ReadFile = -1 \&J7>vu^y Dim oFSO As Object
e@6<mir[4 Set oFSO = CreateObject("Scripting.FileSystemObject") XFPWW , Erase lineArray 4QZ -7_ o64&BpCK Dim fid As Long !h{qO&ZH= If oFSO.fileexists( fileName ) Then |Gb"%5YD fid = FreeFile() VAF+\Cea= Open fileName For Input As fid #m6 eG&a lineArray = Split(Input(LOF(fid), fid), vbCrLf) u~6`9'Ms Close fid ]C-hl}iq End If E/9 U0 Set oFSO = Nothing hV/$6 8A_ Return UBound( lineArray ) 2;NIUMAMM cTFyF) End Function AS[cz!
> a1Qg&s< Sub GetFileList( ByVal in_dir As String, _ JB a:))lw ByRef in_flist() As String ) }|
_uqvin ,Utp6X 'Redimension the file list array it!8+hvq9* Erase in_flist &+=A;Y) RZ9vQ\X
U) 'Tracks how many files are found `AeId/A4n Dim fCount As Long +s
c|PB fCount = 0 <SUjz}_Oa: ,L^eD>|j5 'Recurse directory and search for text files L{;q ^ Dim f As String k`6T% [D] f = Dir$(in_dir & "*.txt") ^$DpdzI While f <> "" l)fF)\ |;= ReDim Preserve in_flist(fCount) ^_r8R__S: in_flist(fCount) = f
DHJh.Y@H fCount += 1 <P7f\$o~ f = Dir$() .0S.7w3dZo Wend gd-4hR ReDim Preserve in_flist(fCount-1) a -,!K 2GA6@-u\ End Sub ^wCjMi(sj wX" 6 S: 9 W><m[O QQ:2987619807 xxgS!J
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