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摘要: ]i*](UQ KvPX=/&Zu 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。 xI*#(!x"G wJ<Oo@snm 背景: m~hoE8C$ 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。 >q~l21dUi 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。 M$Zo.Bl$( 图1. RPC Photonics工程漫射体结构及光束投射形状 fV:4#j *Vw\'%p* k0-G$|QgIp 步骤 WQNE2Q Xjio Z 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Gfp1mev SLfFqc+n0 图2. RPC Photonics工程漫射体不同类型的散射数据 >wHxmq8F5< 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) WY:&ugGx 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 u{N,Ib
8 例如下所示: I zbU)ud Sample name: EDF-C1-56 gb=/#G0R Merging data from file EDF-C1-56 0-0.txt `(6r3f~XJ Finished merging RPC data for sample EDF-C1-56 `1OgYs FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 4_ v]O 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 xM[Vc
a. 创建一个新的散射库 iJ' xh n b. 散射模型命名 so$(_W3E, c. 改变散射模型为“Tabulated BSDF”. dC\ZjZZ 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 ) :'F}Dy 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。 0$+fkDf f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, A\_ |un% g. 点击OK vDl- "!G1 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 oh"O07 <s5qy- @~c6qh 脚本代码: Z+j\a5d?, [.hyZ}B '#Language "WWB-COM" %CUGm$nH zA+~7;7E Option Explicit Ghl'nqPlm AcI,N~~ Sub Main pD]0`L-HJU I1oje0$ 'Cleanup HHX-1+L ClearOutputWindow() Y)N-V
]5L &[NG]V!Oc Print "Merging RPC Photonics BSDF Data Files" r78TE@d SetTextColor(255,0,0) ]?x:
Qm'yo Print "Note: Script should be located in the same folder as the BSDF TXT files." cLPkK3O\= Print "Note: Do not run this script multiple times without deleting the output file between executions." t5)+&I2 SetTextColor(0,0,0) oI)GKA_Ng7 Yt|6
X:l 'Current directory of this script (should be the same as the text files being merged) ,QzL)W7 Dim cDir As String 3d<HN6&U cDir = MacroDir$ & "\" SS`qJZ|w
[aI]y=v 'Array which will be populated with the list of files to be merged / XnhmqWm% Dim fList() As String, curFile As String jM-)BP6f4 GetFileList( cDir, fList ) !RyO\>:q c wg
!j!l Print "" WD Fjp Print "Files found for merging:" [=B$5%A For Each curFile In fList [,2|Flf
e Print Chr(9) & curFile it] E-^2> Next fDG0BNLY d*)CT?d& 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. xss`Y,5? Dim nameArray() As String, sampName As String ^rvx!?zO nameArray = Split(fList(0)," 0-0.txt")
,g%&|FAP sampName = nameArray(0) /Uo
y/}! Print "" zC_<(4$-" Print "Sample name: " & Chr(9) & sampName }y9mNT T3`ludm^u 'Open an output file and write the FRED header data h?bb/T+' Dim outFile As String 6c^e\0q outFile = cDir & sampName & "_FRED.txt"
~"UV]Udn Open outFile For Output As #1 &WNf
M+ Print #1, "type bsdf_data" %Y!Yvw^&P( Print #1, "format angles=deg bsdf=value scale=1" Or
!+._3i U|g:`v7 'Loop the file list, skip the two header lines and write the remaining data to file )(y)A[ Dim lineArray() As String, curLine As Long +cD!1IT: For Each curFile In fList F(t=!k,4\ Print "Merging data from file " & curFile <dW]\h?) ReadFile( cDir & curFile, lineArray ) rvr-XGK36\ For curLine = 2 To UBound(lineArray) (@iMLuewK Print #1, lineArray(curLine) Oft4-4$E Next n_3O-X( Next 1"pw <7-J0btV 'Close the output file 35tu>^_#V Close #1 gY@N~'f;" UI>Y0O Print "Finished merging RPC data for sample " & sampName 6xD#? Print "FRED formatted data file: " & Chr(9) & outFile } :Z#}8 End Sub /z BxJT0 F<!)4>2@ 'Utility function to read the contents of a file into an array of strings. Ug&,Y/tFw2 Function ReadFile(ByVal fileName As String, _ 61xs%kxb.. ByRef lineArray() As String) As Long bQ~j=\[r 97ql5 ReadFile = -1 (PfqRk1Y Dim oFSO As Object 0{#8',*}m? Set oFSO = CreateObject("Scripting.FileSystemObject") J/}:x;Y Erase lineArray ,_"AT!r {dmj/6Lc Dim fid As Long ?s:d[To6 If oFSO.fileexists( fileName ) Then PssMTEf fid = FreeFile() bT&: fHc Open fileName For Input As fid gks{\ H] lineArray = Split(Input(LOF(fid), fid), vbCrLf) /% kY0 LY Close fid ;\p KDPr End If `F/Tv 5@L Set oFSO = Nothing }[M`uZ Return UBound( lineArray ) 8=]Tr3 y.[Mnj End Function U^Xm)lL ij? Sub GetFileList( ByVal in_dir As String, _ 9;veuX#( ByRef in_flist() As String ) P3oI2\)*i +"1NC\<* 'Redimension the file list array &LbJT$}V Erase in_flist g&`pgmUX 7U"[Gf 'Tracks how many files are found Sv &[f}S Dim fCount As Long F4K0); fCount = 0 9~ l
hsH zL\OB?)5J 'Recurse directory and search for text files |O"lNUW Dim f As String {#{DH?=^)u f = Dir$(in_dir & "*.txt") -=(!g&0 While f <> "" _r2J7& ReDim Preserve in_flist(fCount) %*\es7m} in_flist(fCount) = f DG?"5:Zd fCount += 1 P LueVz f = Dir$() gH G Wend {uHU]6d3qy ReDim Preserve in_flist(fCount-1) 0=K9`=5d0 7PkJ-JBA End Sub Mb]rY>B4 qM.bF&&Go EI^06q4x QQ:2987619807 :hM/f
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