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摘要: #p=+RTZ< {!(
htg; 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。 j\KOKvY) n\Is}Czl 背景: C,;<SV2# 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~+aD2E { 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。 G AH< 图1. RPC Photonics工程漫射体结构及光束投射形状 f4<~_ZGr ZD50-w; ,^4"e
( 步骤 Sy.%>$ z *W2] Kxx* 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。 q:vN3#=^qf iU0jv7}n 图2. RPC Photonics工程漫射体不同类型的散射数据 B7A.~'= 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) $hJ 4=F 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 X%!?\3S 例如下所示: 3|e~YmZx Sample name: EDF-C1-56 !U5Cwq Merging data from file EDF-C1-56 0-0.txt BB,-HhYT0 Finished merging RPC data for sample EDF-C1-56 78T;b7!-C FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt aG" 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 MAqETjB a. 创建一个新的散射库 p^{yA"MQ b. 散射模型命名 N<(rP1)`v c. 改变散射模型为“Tabulated BSDF”. YedF% d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 4u p7:? e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 +CEt:KQ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ?~^p:T g. 点击OK %,N-M]Jf 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 KPK`C0mg@k WVyq$p/V -K^(L#G 脚本代码: (s1iYK Pmuk !V}f '#Language "WWB-COM" 5U_ar _n*gj- Option Explicit ('_S1?y _Axw$oYS Sub Main VF-[O UA0R)BH' 'Cleanup bnp:J|(ld ClearOutputWindow() PwAmnk ! IOrYm Print "Merging RPC Photonics BSDF Data Files" [eF|2: SetTextColor(255,0,0) w `M/0.)V Print "Note: Script should be located in the same folder as the BSDF TXT files." U$ZbBVa`~ Print "Note: Do not run this script multiple times without deleting the output file between executions." "g!/^A!! SetTextColor(0,0,0) \<=.J`o{ j,_{f =3; 'Current directory of this script (should be the same as the text files being merged) S@L%X<Vm Dim cDir As String DqH]F S?] cDir = MacroDir$ & "\" )6he;+ 9Xh<vh8& 'Array which will be populated with the list of files to be merged .fzns20u Dim fList() As String, curFile As String xUs1-O1i GetFileList( cDir, fList ) KC\W6|NtGj ~r]$(V n
Print "" 1N8YD .3 Print "Files found for merging:" \cAifU For Each curFile In fList ^6,}*@ Print Chr(9) & curFile JZNvuP D Next >F!X'#Iv aOW~! f/M 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 7
(i\? Dim nameArray() As String, sampName As String ,S3uY6, nameArray = Split(fList(0)," 0-0.txt") VS<w:{* sampName = nameArray(0) -uK@2}NZ
Print "" 5sMyH[5zY Print "Sample name: " & Chr(9) & sampName TP/bPZY H!g9~a 'Open an output file and write the FRED header data e]d\S]5 Dim outFile As String u z>V outFile = cDir & sampName & "_FRED.txt" 6FI`0j=~ Open outFile For Output As #1 ]n|lHZR Print #1, "type bsdf_data" zU>bT20x/ Print #1, "format angles=deg bsdf=value scale=1" EO.}{1m=hx 7!,
p,|K 'Loop the file list, skip the two header lines and write the remaining data to file \o!B:Vb< Dim lineArray() As String, curLine As Long V_Y2 @4 For Each curFile In fList YcuHYf5 Print "Merging data from file " & curFile E'_$?wWn5 ReadFile( cDir & curFile, lineArray ) {B\lk:"X For curLine = 2 To UBound(lineArray) 9O#?r82 Print #1, lineArray(curLine) fL R.2vJ Next ^F$iD (f Next &
Mf nH |G>Lud 'Close the output file 6?jSe<4x Close #1 y
+c 3# cX-)]D Print "Finished merging RPC data for sample " & sampName xXc3#n Print "FRED formatted data file: " & Chr(9) & outFile "/U~j4O End Sub K"ytE2:3 X1~ B 'Utility function to read the contents of a file into an array of strings. 2Y{r2m|o Function ReadFile(ByVal fileName As String, _ N u9+b"Wr ByRef lineArray() As String) As Long J|I&{ EY
9N{ ReadFile = -1 SQVyCxcX_ Dim oFSO As Object fxk6 q$' Set oFSO = CreateObject("Scripting.FileSystemObject") ,!g%`@u Erase lineArray E?P:!V=_ yE),GJ-m\< Dim fid As Long O0#9D'{ If oFSO.fileexists( fileName ) Then _:,U$W fid = FreeFile()
HvVS<Ke Open fileName For Input As fid })@LvYK lineArray = Split(Input(LOF(fid), fid), vbCrLf) W_N!f=HW Close fid O_wRI\! End If :>otlI<0t Set oFSO = Nothing ZYX(Cf Return UBound( lineArray ) `]:&h' v/lQ5R1 End Function (|<.7K N u~a@:D/F{G Sub GetFileList( ByVal in_dir As String, _ g{06d~Y ByRef in_flist() As String ) JdeGQ s\dF7/b 'Redimension the file list array c 7uryL Erase in_flist F45UO%/P u0& dDZ 'Tracks how many files are found uEKa
FRm Dim fCount As Long ${%*O}$ fCount = 0 UA}oOteG F[SYs/M 'Recurse directory and search for text files & ]/Z~V t Dim f As String c,I|O'
&k f = Dir$(in_dir & "*.txt") >Kc>=^=5 While f <> "" RI%ZT ReDim Preserve in_flist(fCount) |YAnd=$ in_flist(fCount) = f SQB[d3f fCount += 1 \!4sd2Yi f = Dir$() e: Wend Ug^v
]B9 ReDim Preserve in_flist(fCount-1) p$cSES>r: J<{@D9r9<~ End Sub |F 18j9 yr
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