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摘要: 8uch i +th%enRB 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。 I
:)W*SK V*RdDF7 背景: \.#p_U5In 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。 aY)2eY 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。 <7XT\?%F 图1. RPC Photonics工程漫射体结构及光束投射形状 tmJgm5v $bsH$N#6T % /}WUP^H 步骤 s-*._; p $ouh 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 AIRr{Y 1A<,TFg 图2. RPC Photonics工程漫射体不同类型的散射数据 o''wCr% 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) aWy]9F&C: 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 iqwkARG" 例如下所示: }BJX/, H, Sample name: EDF-C1-56 5$rSEVg9 Merging data from file EDF-C1-56 0-0.txt MCc$TttaVz Finished merging RPC data for sample EDF-C1-56 %Dig)<yx FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt nSx]QREL! 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ^2JpWY:|7 a. 创建一个新的散射库 q,%:h`t\ b. 散射模型命名 hs+kr?Pg` c. 改变散射模型为“Tabulated BSDF”. .*YD&( d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) :+rUBYWx e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 0;.<~;@h f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, )]43R g. 点击OK EU-]sTJLF 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 atF?OP|{,w Sr_VL:Gg }{[mrG 脚本代码: {ZsdLF# T=Z.TG|lIx '#Language "WWB-COM" l2jF#<S@ D y-S98Y Option Explicit I?Aj.{{$G% nV_8Ke Sub Main fJAnKUF) uz30_aH 'Cleanup M@Q3M(z ClearOutputWindow() ^W?Z ++-{]wB3=. Print "Merging RPC Photonics BSDF Data Files" qMYe{{r SetTextColor(255,0,0) HQP}w%8x Print "Note: Script should be located in the same folder as the BSDF TXT files." fbvbz3N Print "Note: Do not run this script multiple times without deleting the output file between executions." {aYY85j SetTextColor(0,0,0) ]3iH[,KU3 zDTv\3rZ4X 'Current directory of this script (should be the same as the text files being merged) @A<PkpNL Dim cDir As String .L6Zm U cDir = MacroDir$ & "\" E:`v+S_h O1&b]C# 'Array which will be populated with the list of files to be merged >Z.\J2wM<j Dim fList() As String, curFile As String c]-*P7W GetFileList( cDir, fList ) q`NXJf=sc ~]C%/gEh Print "" A]0:8@k5 Print "Files found for merging:" 3r+.N For Each curFile In fList NB_)ZEmF Print Chr(9) & curFile _nh[(F<hz Next 4NN$( S-W ) 0 W` 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. M=qb^~ l Dim nameArray() As String, sampName As String T:]L/wCj nameArray = Split(fList(0)," 0-0.txt") u"1rF^j6k sampName = nameArray(0) :#k &\f-Y Print "" B~
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Print "Sample name: " & Chr(9) & sampName 5{e,L>H< eB>s=}| 'Open an output file and write the FRED header data ^O(=Vry Dim outFile As String Isy'{-H
outFile = cDir & sampName & "_FRED.txt" u9+kLepOT Open outFile For Output As #1 ZK;z m Print #1, "type bsdf_data" Q6gt+FKU9 Print #1, "format angles=deg bsdf=value scale=1" j]|U [u}(57DS 'Loop the file list, skip the two header lines and write the remaining data to file dovZ#D@Q Dim lineArray() As String, curLine As Long x<Vm5j For Each curFile In fList M-)RQ-h Print "Merging data from file " & curFile 5tjP6Z`!9` ReadFile( cDir & curFile, lineArray ) 8to8!( For curLine = 2 To UBound(lineArray) zZcnijWb Print #1, lineArray(curLine) D:^$4}h
f Next m5mu: Next W[EKD 7 yz8mP3"c:o 'Close the output file bXUy9-L Close #1 ~/^5) g_ G,Z^g|6 Print "Finished merging RPC data for sample " & sampName /~*_x=p: Print "FRED formatted data file: " & Chr(9) & outFile H ]4Hj End Sub sGh(#A0Pt 3rLTF\ 'Utility function to read the contents of a file into an array of strings.
rc&%m Function ReadFile(ByVal fileName As String, _ Hbv6_H ByRef lineArray() As String) As Long WJ<^E"^ `.s({/|[ ReadFile = -1 u:0aM}9A Dim oFSO As Object w 4[{2 Set oFSO = CreateObject("Scripting.FileSystemObject") T\~x.aH`^ Erase lineArray `Al;vVMRO Y0?5w0{ Dim fid As Long ][}0#'/mV If oFSO.fileexists( fileName ) Then X7k.zlH7T fid = FreeFile() l
Va &" Open fileName For Input As fid U9b?i$ lineArray = Split(Input(LOF(fid), fid), vbCrLf) BIuK @$ Close fid bfo[" End If L(&&26Y Set oFSO = Nothing )K &( Return UBound( lineArray ) McB[|PmC q,
O$ %-70 End Function h=;{oY<V)? :
]C~gc Sub GetFileList( ByVal in_dir As String, _ tcxcup% ByRef in_flist() As String ) 6@DF (5]}5W* 'Redimension the file list array pz"0J_xDM Erase in_flist "DYJ21Ut4 ~69&6C1Ch 'Tracks how many files are found *6q5S4 r Dim fCount As Long j?'GZ d"B fCount = 0 Gea\,{E9xA 7uzkp&+: 'Recurse directory and search for text files SdD6 ~LS Dim f As String ]+X@
7 f = Dir$(in_dir & "*.txt") 0_ 88V While f <> "" Gz.|]:1 ReDim Preserve in_flist(fCount) eM8}X[ in_flist(fCount) = f oq}'}`lw" fCount += 1 X&kp;W f = Dir$() Bve.C
Wend .V,@k7U,V ReDim Preserve in_flist(fCount-1) :O uA)f d3xmtG {i End Sub J{Q|mD= 0Vx.nUQ EN/,5<S<,[ QQ:2987619807 rW$[DdFA5{
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