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摘要: 2E^zQ>;01
Q_'3}:4 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。 a_/\. *upl*zFf0 背景: {w.rcObIw+ 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。 [)|P-x-< 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。 @2-Eky 图1. RPC Photonics工程漫射体结构及光束投射形状 r#wMd9]) FA?xp1E
]Kb 步骤 E~xK1x" _B)LRD+Hj 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。 s8.O L_e LUv>0G#L[ 图2. RPC Photonics工程漫射体不同类型的散射数据 Q+E%"`3V4l 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) E_]L8UC;m
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 't
\:@-tQ 例如下所示: wxpE5v+f| Sample name: EDF-C1-56 stz1e
dP Merging data from file EDF-C1-56 0-0.txt ,JyE7h2%i Finished merging RPC data for sample EDF-C1-56 ?y!0QAIXK FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt J')Dt]/9 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 DYJ@>8 a. 创建一个新的散射库 E^ _P b. 散射模型命名 <#JJS}TLk c. 改变散射模型为“Tabulated BSDF”. iy Zs:4jkc 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 ) $:w4_X5T 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:CJl6~N)# 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, =YkJS%)M) g. 点击OK "0Uh(9Fv 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 GEXT8f(7 ET1/oG<@ D+d\<": 脚本代码: $}r*WZ
.|$6Pi%! '#Language "WWB-COM" Mh>H5l.1i g![]R-$ Option Explicit #>dfP"}&, 7yxZe4~|# Sub Main "TA r\;[ 7(lR$,bE;= 'Cleanup ;LNFPo
ClearOutputWindow() -8; ,# Z{7lyEzBg Print "Merging RPC Photonics BSDF Data Files" pXPwn( SetTextColor(255,0,0) Urur/_]-% Print "Note: Script should be located in the same folder as the BSDF TXT files." 7$'%*|C. Print "Note: Do not run this script multiple times without deleting the output file between executions." IwhZzw
w SetTextColor(0,0,0) n!~mdI& sF^3KJ| 'Current directory of this script (should be the same as the text files being merged) &Al9%W Dim cDir As String >tXn9'S cDir = MacroDir$ & "\" c%c/mata? o1='Fr 'Array which will be populated with the list of files to be merged He="S3XON Dim fList() As String, curFile As String 1ux~dP GetFileList( cDir, fList ) >K**SjVG ,$@nbS{Q] Print "" EU.vw0}u8 Print "Files found for merging:" Z W`
Ur> For Each curFile In fList `W< 7. Print Chr(9) & curFile _XIls*6AK Next p"f=[awp 3/mVdU?U 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. mz;S*ONlV Dim nameArray() As String, sampName As String uhvmh nameArray = Split(fList(0)," 0-0.txt") \dSMF,E sampName = nameArray(0) ~fB}v Print "" L{(\k$>' Print "Sample name: " & Chr(9) & sampName |xyr6gY | iEhe 'Open an output file and write the FRED header data mz@`*^7? Dim outFile As String XH&Fn+ outFile = cDir & sampName & "_FRED.txt" fBS`b[x Open outFile For Output As #1 '{WYho! Print #1, "type bsdf_data" Y\luz`v Print #1, "format angles=deg bsdf=value scale=1" de]r9$D "H\'4'hg 'Loop the file list, skip the two header lines and write the remaining data to file w
V&{w7 Dim lineArray() As String, curLine As Long 9.ZhkvR4A For Each curFile In fList wP3_RA]z Print "Merging data from file " & curFile =\.Oc+p4 ReadFile( cDir & curFile, lineArray ) Cr|v3Y#h' For curLine = 2 To UBound(lineArray) x;"! Print #1, lineArray(curLine) peqoLeJI Next aZ^P*|_K3 Next !U.Xb6 fI(u-z~, 'Close the output file o.U$\9MNP Close #1 `"QUA G R>H*MvN Print "Finished merging RPC data for sample " & sampName $by-?z(( Print "FRED formatted data file: " & Chr(9) & outFile D ODo
! End Sub 0.S].Y[ |1J=wp)# 'Utility function to read the contents of a file into an array of strings. d
(]t} Function ReadFile(ByVal fileName As String, _ .kh%66: ByRef lineArray() As String) As Long e:}8|e~T E15"AO ReadFile = -1 JmdXh/X Dim oFSO As Object 3?I^D /K^ Set oFSO = CreateObject("Scripting.FileSystemObject") GgkljF@{} Erase lineArray <(W0N|1v bf2R15|t5` Dim fid As Long g/,fjM_ If oFSO.fileexists( fileName ) Then >ijFQ667>j fid = FreeFile() %
INRds Open fileName For Input As fid H6?ZE lineArray = Split(Input(LOF(fid), fid), vbCrLf) :Z(?Ct&8 Close fid d!/@+i End If mN3}wJ}J Set oFSO = Nothing s mub> V Return UBound( lineArray ) [o8a(oC jq(3y|6, End Function OD<0,r0f, HH+R47%* Sub GetFileList( ByVal in_dir As String, _ 2%\Nq:;T ByRef in_flist() As String ) ZxkX\gl91 @!6eRp>Z 'Redimension the file list array {H s""/sb Erase in_flist _.0c~\VA d{+H|$L` 'Tracks how many files are found 4S|! iOY Dim fCount As Long *0M#{HQ fCount = 0 VpSk.WY/ e q]q(zUtU 'Recurse directory and search for text files QxvxeK!Y Dim f As String TuY{c%qQ: f = Dir$(in_dir & "*.txt") Y'"2s~_
Z While f <> "" zMb7a_W ReDim Preserve in_flist(fCount) )%%RI_JT in_flist(fCount) = f ;`g\T u fCount += 1 ,
RfU1R f = Dir$() a%f{mP$m Wend >R3~P~@30 ReDim Preserve in_flist(fCount-1) Qfo'w%px Mp;t?C4 End Sub pW O-YZ#+
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