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摘要: Kxc$wN< 9]@J*A}=l RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 o:8S$F`O@ #)A?PO2 背景: 9/daRq$ 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。 a^c,=X3 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。 o+-Ge
J 图1. RPC Photonics工程漫射体结构及光束投射形状 OF<n T cm@ oun d50IAa^p6J 步骤 2${,%8"0s 5Vnr"d 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 +<\cd9 "gN* J)!x 图2. RPC Photonics工程漫射体不同类型的散射数据 y-<PsP-I 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) )SL@>Cij 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 CDW(qq-zD 例如下所示: IEoR7: Sample name: EDF-C1-56 #4_O;]{' Merging data from file EDF-C1-56 0-0.txt 7
Mki?EG Finished merging RPC data for sample EDF-C1-56 |:=b9kv FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt \e:FmG 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 k[ffs} a. 创建一个新的散射库 _X%6 +0M
b. 散射模型命名 Fm$n@RbX c. 改变散射模型为“Tabulated BSDF”. H]i+o6 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 ) ;/";d]j 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。 ;8L+_YCa 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, oa&US_ g. 点击OK ;h-G3>Il 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 0J:U\S <S8I"8{Mb e(n2+S#N 脚本代码: oX2DFgz
Z;Ir>^< '#Language "WWB-COM" c;21i;&,9 [2QY Option Explicit mU?&\w=v$ |P. = Sub Main v;bM.OL +%e%UF@ 'Cleanup `FYtiv?G ClearOutputWindow() #>E3' 5b +2V%'{: Print "Merging RPC Photonics BSDF Data Files" @}&,W
N% SetTextColor(255,0,0) ]*g ss'N Print "Note: Script should be located in the same folder as the BSDF TXT files." ^i`3cCFB< Print "Note: Do not run this script multiple times without deleting the output file between executions." nz&b5Xb2 SetTextColor(0,0,0) |%:qhs, S&
, Ju% 'Current directory of this script (should be the same as the text files being merged) Gh$y#0qr Dim cDir As String } Jdh^t . cDir = MacroDir$ & "\" f#;ubfi"z r>@ B+Xi 'Array which will be populated with the list of files to be merged ]s*[Lib Dim fList() As String, curFile As String n~"g'Y GetFileList( cDir, fList ) %;=IMMK PUQ_w Print "" /\ ,_P Print "Files found for merging:" (5Z8zNH`3 For Each curFile In fList I*+LJy;j Print Chr(9) & curFile H#kAm!H Next GG@I!2,_ 2rR@2Vsw2 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. RR~sEUCo{ Dim nameArray() As String, sampName As String R<y Nv nameArray = Split(fList(0)," 0-0.txt") dr,B\.|jC sampName = nameArray(0) -+
]T77r Print "" 8`AcS|k Print "Sample name: " & Chr(9) & sampName (6ohrM>Q *c~'0|r 'Open an output file and write the FRED header data Q>}eIQ Y Dim outFile As String ~!3t8Hx6 outFile = cDir & sampName & "_FRED.txt" DGa#d_I Open outFile For Output As #1 8CP9DS Print #1, "type bsdf_data" OQytgXED Print #1, "format angles=deg bsdf=value scale=1" Z%Tq1O <t?x 'r?@ 'Loop the file list, skip the two header lines and write the remaining data to file q7O,I`KaJ Dim lineArray() As String, curLine As Long E(aX4^]g For Each curFile In fList (!3Yc:~RE Print "Merging data from file " & curFile 27Kc-rcB ReadFile( cDir & curFile, lineArray ) V!pq,!C$v For curLine = 2 To UBound(lineArray) p~Yy"Ec;p Print #1, lineArray(curLine) U,%s; Next RR[)UQ Next "xe7Dl dJdD"xj 'Close the output file _SMT.lG
Close #1 8Ehy9< /32Ta Print "Finished merging RPC data for sample " & sampName SE-!|WR Print "FRED formatted data file: " & Chr(9) & outFile V9 +xL 1U# End Sub }
D/+< yM (_P0 'Utility function to read the contents of a file into an array of strings. ;x!,g5q"q Function ReadFile(ByVal fileName As String, _ l1-4n*fU ByRef lineArray() As String) As Long U7nsMD ~=`f]IL ReadFile = -1 T!m42EvIvE Dim oFSO As Object q=P
f^Xp Set oFSO = CreateObject("Scripting.FileSystemObject") ^#a#<8Jz Erase lineArray MAuM)8_P/| 07$/]eO%C Dim fid As Long x\Nhix}1D If oFSO.fileexists( fileName ) Then rtB|N- fid = FreeFile() ^;V}l?J_s Open fileName For Input As fid paq8L{R lineArray = Split(Input(LOF(fid), fid), vbCrLf) B8bvp:Ho| Close fid 3gxf~$)? End If w;N{>)hv Set oFSO = Nothing Tjd&^m Return UBound( lineArray ) M*g2VyZ "_nX5J9 End Function L/qZ ; { GAg.p?Sq Sub GetFileList( ByVal in_dir As String, _ QT`fix{ ByRef in_flist() As String ) Bv;I0i:_
Q;XXgX#l 'Redimension the file list array 2"T8^r|U Erase in_flist S9OxI$6Y
#Y;.>mF 'Tracks how many files are found /'-:=0a Dim fCount As Long umJay/> fCount = 0 `^O'V}T tH-gaDj_ 'Recurse directory and search for text files k
TF z_*6. Dim f As String cj$,ob&DX f = Dir$(in_dir & "*.txt") }R`8h&J While f <> "" b cC\ ReDim Preserve in_flist(fCount) n
(OjjRm in_flist(fCount) = f Wl,%&H2S< fCount += 1 /DLr( f = Dir$() 8&?^XcJ*x Wend ,)Yao;Cvd ReDim Preserve in_flist(fCount-1) 2;&mkcK' c}YJqhk0J End Sub
DY$yiOH9 R|/Wz/$1A n(Qj||: QQ:2987619807 ,yTN$K%M
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