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摘要: 2/]74d8 ;[~:Y[N 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。 @h&crI[c ].C4RH 背景: ;}BDEBl 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。 vS$_H<;P FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 2UF
,W] 图1. RPC Photonics工程漫射体结构及光束投射形状 rL=_z^.P _ Db05:r@ m.K@g1 G 步骤 =vaC?d3 >){"x(4` 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。
Zoi\r j$z<wR7j0 图2. RPC Photonics工程漫射体不同类型的散射数据 X/D^?BKC 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) AKbrXKx 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 foOwJ }JU 例如下所示: :{ }]$+|)\ Sample name: EDF-C1-56 T.57Okp Merging data from file EDF-C1-56 0-0.txt Gc'CS_L Finished merging RPC data for sample EDF-C1-56 ]S=AO/' FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt wCwJ#-z.= 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 !7KSNwGu a. 创建一个新的散射库 m<DiYxK b. 散射模型命名 L`M.Htm8 c. 改变散射模型为“Tabulated BSDF”. *yx&4)Or d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) PU6Sa-fQ2, e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 L:(>ON f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, wLDWD,"K g. 点击OK d? Old 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 DD4fV`:kG Y8Bc
&q} 2KUm(B.I 脚本代码: *XCid_{( /_`f b)f '#Language "WWB-COM" Y}/e"mp d0;$k, Option Explicit Y)-)owx7 6^oQ8unmS Sub Main g@<E0
q&`$ .5;Xd? 'Cleanup _7O;ED+ ClearOutputWindow() 1ud+~y$K ,1s,G]%M Print "Merging RPC Photonics BSDF Data Files" ;-OnCLr SetTextColor(255,0,0) F>0[v|LG Print "Note: Script should be located in the same folder as the BSDF TXT files." bvuoo/ Print "Note: Do not run this script multiple times without deleting the output file between executions." t#Q" ;e SetTextColor(0,0,0) nJvDk h#h1 !&3iZQGWv 'Current directory of this script (should be the same as the text files being merged) qOusO6 Dim cDir As String b* QRd cDir = MacroDir$ & "\" h27awO
Q oj6b33z 'Array which will be populated with the list of files to be merged @-~
)M_ Dim fList() As String, curFile As String %|3I|'%Y GetFileList( cDir, fList ) &!y7PWHJ (&w'"-` Print "" v[aFSXGj) Print "Files found for merging:" 9'qU4I For Each curFile In fList }|k_sx: Print Chr(9) & curFile 0{8^)apII Next [BH^SvE y}fF<qih'> 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. j A 9! Dim nameArray() As String, sampName As String #q06K2 nameArray = Split(fList(0)," 0-0.txt") c\n&Z'vK sampName = nameArray(0) 6(Qr!< Print "" S~8w- lG! Print "Sample name: " & Chr(9) & sampName q*Hf%I" #SHmAB 'Open an output file and write the FRED header data rcC}4mNe Dim outFile As String O:=%{/6&D outFile = cDir & sampName & "_FRED.txt" tA?cHDp4E Open outFile For Output As #1 Y4\BHFq Print #1, "type bsdf_data" 62R94 Print #1, "format angles=deg bsdf=value scale=1" eYER"E B]`!L/ 'Loop the file list, skip the two header lines and write the remaining data to file YpAJ7E|7 Dim lineArray() As String, curLine As Long ,_JhvPWR,) For Each curFile In fList 1N`1~y Print "Merging data from file " & curFile JQ>GKu~ ReadFile( cDir & curFile, lineArray ) JJ50(h)U For curLine = 2 To UBound(lineArray) )YDuq(g& Print #1, lineArray(curLine) PY4RwN Next X>[x7t: Next !n=?H1@ *Cdw"n 'Close the output file P%#EH2J Close #1 {*=+g>RgD \(nb
>K Print "Finished merging RPC data for sample " & sampName h6*&1r Print "FRED formatted data file: " & Chr(9) & outFile hmA$gR_ End Sub ?e`4
sf_~ )yV|vn 'Utility function to read the contents of a file into an array of strings. %:v59:i} Function ReadFile(ByVal fileName As String, _ hPCt- ByRef lineArray() As String) As Long ){AtV&{$ x>>#<hOz[ ReadFile = -1 *4i)aj Dim oFSO As Object Quc,,#u Set oFSO = CreateObject("Scripting.FileSystemObject") I9! eL4e Erase lineArray 0XrB+nt *V\z]Dy-[ Dim fid As Long rjmKe*_1V If oFSO.fileexists( fileName ) Then [79 eq= fid = FreeFile() oD$8( Open fileName For Input As fid Q*S|SH-cZ0 lineArray = Split(Input(LOF(fid), fid), vbCrLf) DFgr,~ Close fid >m}U|#;W End If Yy 4EM Set oFSO = Nothing `1cGb *b/ Return UBound( lineArray ) AL%gqt] ^2gDhoO_ End Function [0_JS 2KE i6"/GSA
Sub GetFileList( ByVal in_dir As String, _ ]=s!cfu ByRef in_flist() As String ) /5:f[-\s xvZNshkpAX 'Redimension the file list array Cm~h\+" Erase in_flist 4H7
3a5f g/)$-Z)Nu 'Tracks how many files are found 49)A.Bh&! Dim fCount As Long |
HkLl^ fCount = 0 <b-BJ2],k \5+?wpH 'Recurse directory and search for text files _xg4;W6M= Dim f As String i\P?Y(-{ f = Dir$(in_dir & "*.txt") Fq{Z-yVp While f <> "" R^%uEP ReDim Preserve in_flist(fCount) Qfhhceb6#J in_flist(fCount) = f Gj[+{ fCount += 1 '%W'HqVcG1 f = Dir$() qz|`\^ Wend 87/!u]q ReDim Preserve in_flist(fCount-1) x+kP,v @W\y#5"B End Sub Mo+mO&B
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