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摘要: 3Sfd|0^ ?P0b/g 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。 ASbIc"S6 _rYW|*cIF 背景: $}WT"K Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 sF!#*Y FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 BQPmo1B 图1. RPC Photonics工程漫射体结构及光束投射形状 ;"Gy5 *`+zf7-f G"FO%3&| 步骤 %9>w|%+;U+ ,A` |jF 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 95'+8*YCY =8 @DYz' 图2. RPC Photonics工程漫射体不同类型的散射数据 }
KyoMs 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) GL O3v.
n; 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 %htI!b+"@ 例如下所示: 7/~=[#]* Sample name: EDF-C1-56 bfA>kn0C Merging data from file EDF-C1-56 0-0.txt &233QRYM Finished merging RPC data for sample EDF-C1-56 2JK
'!Ry) FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt f1aZnl 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 o.!o4&WH a. 创建一个新的散射库 X,w X)9]J b. 散射模型命名 u1X^#K$nu' c. 改变散射模型为“Tabulated BSDF”. nvndgeSy 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 ) aH."|
*. 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。 9~W]D!m, 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, ^o5;><S] g. 点击OK 4:rwzRDY 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 oH=?1~e 'l5 x$-kw{N 脚本代码: jr)M], C1NU6iV^z '#Language "WWB-COM" kV1L.Xg BmV`<Q, Option Explicit '/xynk%)xw F62 uDyY Sub Main Ni>Ns=n nRBS&&V 'Cleanup OS#aYER~/ ClearOutputWindow() %}TJr]'F a^l)vh{+ Print "Merging RPC Photonics BSDF Data Files" FcM)v"bF&] SetTextColor(255,0,0) =i vlS Print "Note: Script should be located in the same folder as the BSDF TXT files." (NFrZ0 Print "Note: Do not run this script multiple times without deleting the output file between executions." `D%i`"~Lf& SetTextColor(0,0,0) 129\H<
m &fB=&jc*j 'Current directory of this script (should be the same as the text files being merged) .;7V]B1o Dim cDir As String q!Ek
EW\n cDir = MacroDir$ & "\" 8D)1ZUx7` 8/>.g.] 'Array which will be populated with the list of files to be merged t4UK~ {gh Dim fList() As String, curFile As String =7}1NeC` GetFileList( cDir, fList ) _{'[Uf/l KMi$0+ Print "" AwG0E`SU Print "Files found for merging:" 8i[TeW" For Each curFile In fList P0m9($JBD Print Chr(9) & curFile S~:uOm2t\ Next g "Du]_, X8m-5(uW 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. [4#HuO@h Dim nameArray() As String, sampName As String ~4+Y BN nameArray = Split(fList(0)," 0-0.txt") _fk}d[q0 sampName = nameArray(0) 7u;N/@ Print "" VX8rM!3 Print "Sample name: " & Chr(9) & sampName +H&/C1u 6Tmz!E0 'Open an output file and write the FRED header data b|AjB: G Dim outFile As String # l9VTzi outFile = cDir & sampName & "_FRED.txt" z$^wCd: Open outFile For Output As #1 H,TApF89A Print #1, "type bsdf_data" MuWZf2C Print #1, "format angles=deg bsdf=value scale=1" J\+fkN<. ;O)*!yA(GG 'Loop the file list, skip the two header lines and write the remaining data to file yL
asoh Dim lineArray() As String, curLine As Long >8{w0hh; For Each curFile In fList xKE=$SV( Print "Merging data from file " & curFile BC!) g+8 ReadFile( cDir & curFile, lineArray ) \h'7[vkr For curLine = 2 To UBound(lineArray) hkl0N%[ Print #1, lineArray(curLine) J=Kv-@I>E Next <xeB9 Next \LJ!X3TZ 3q`f|r 'Close the output file >QYx9`x& Close #1 F-ZTy"z ffk>IOH Print "Finished merging RPC data for sample " & sampName j_,/U^Ws|f Print "FRED formatted data file: " & Chr(9) & outFile xkFa End Sub Lbo3fwW Vp; `!+z" 'Utility function to read the contents of a file into an array of strings. 8 !:2: Function ReadFile(ByVal fileName As String, _ [ p,]/ ^ N ByRef lineArray() As String) As Long ??e|ec2% %|+aI? ReadFile = -1 8Y8bFWuc Dim oFSO As Object )6%*=- Set oFSO = CreateObject("Scripting.FileSystemObject") #f(tzPD Erase lineArray ;/V])4= ~6t<`&f Dim fid As Long V?yQm4 If oFSO.fileexists( fileName ) Then H.iCYD_= fid = FreeFile() g4q{
] Open fileName For Input As fid vbJdhaf lineArray = Split(Input(LOF(fid), fid), vbCrLf) dpE^BW v3 Close fid 7R[7M%H End If o% Q7 el$f Set oFSO = Nothing R%r25_8 Return UBound( lineArray ) 4_>;|2 8>j&) @q End Function .n_Z0&i/w Efe(tH2q Sub GetFileList( ByVal in_dir As String, _ H[:lQ\ ByRef in_flist() As String ) -ewR:Y@j n}Eu^^d 'Redimension the file list array tkm@&e=e% Erase in_flist %x,HQNRDU g:~q&b[q6 'Tracks how many files are found c]1AM)xo Dim fCount As Long !oi
{8X@ fCount = 0 Z2*?a|3 6K7lQ!#}Q 'Recurse directory and search for text files sa<\nH$_X Dim f As String 4sSw7` f = Dir$(in_dir & "*.txt") %I`'it2d While f <> "" zQO 1%g ReDim Preserve in_flist(fCount) fzVN;h in_flist(fCount) = f 9Bpb? fCount += 1 WF~x`w&\ f = Dir$() :''Swi<H Wend \kKd:C{ ReDim Preserve in_flist(fCount-1) 78:x{1nUM[ cV1E<CM End Sub Ok)f5")N %
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