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摘要: XabrX|B# yf=ek== 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。 G\H@lFh "A:wWb<m 背景: 9CWUhS
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+S]<O 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。 w
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lO\ 图1. RPC Photonics工程漫射体结构及光束投射形状 AMYoSc EVj48 =k[!p'~jD 步骤 *0R=(Gy ^aZ Wu|p 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。 Z3R..vy8 *qG=p` 图2. RPC Photonics工程漫射体不同类型的散射数据 |"P5%k#6^> 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) o0wep&@ 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 7@Di nA! 例如下所示: T"Q4vk,3*J Sample name: EDF-C1-56 BsB}noN} Merging data from file EDF-C1-56 0-0.txt "MXd! Finished merging RPC data for sample EDF-C1-56 xsFW F*HPs FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt h3p 3~xq 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 z PV/{)S a. 创建一个新的散射库 7B%@f9g b. 散射模型命名 ~ilbW|s?=k c. 改变散射模型为“Tabulated BSDF”. O|j5ulO}&" 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 ) =WEfo; 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。 BJj~fNm1Zr 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, /,0t,"&Aqa g. 点击OK @-b}iP<T 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 jd2Fh):q V6$v@Zq [1nI%/</> 脚本代码: u>S&?X'a lGLZIp '#Language "WWB-COM" iMp)g%Ng \Y!Z3CK Option Explicit t41cl x2ol Sub Main 5Ij_$a Op%^dwVG(v 'Cleanup 1C$^S]v%a ClearOutputWindow() Z^fF^3x Z=F=@ <! Print "Merging RPC Photonics BSDF Data Files" "4tRy9q SetTextColor(255,0,0) //+UQgl6 Print "Note: Script should be located in the same folder as the BSDF TXT files." Z@ws,f^e Print "Note: Do not run this script multiple times without deleting the output file between executions." ~4`wfOvO SetTextColor(0,0,0) ,+X8?9v >M1/m=a 'Current directory of this script (should be the same as the text files being merged) iqoPD4A Dim cDir As String OC>" + cDir = MacroDir$ & "\" ]owH [wvX C6P6 hJm 'Array which will be populated with the list of files to be merged sG VC+!E Dim fList() As String, curFile As String e8lF$[i GetFileList( cDir, fList ) 95!xTf C3_*o>8 Print "" 5;^8wh( Print "Files found for merging:" 8Peqm?{5Y5 For Each curFile In fList }dXL= ul Print Chr(9) & curFile ttw@nv%
@ Next |;_
yAL GS{9MGl 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. tRv#%>fj Dim nameArray() As String, sampName As String ]Pd*w`R nameArray = Split(fList(0)," 0-0.txt") =;{S>P!I(t sampName = nameArray(0) Z?x]HB`r Print "" 2)8lJXM$L Print "Sample name: " & Chr(9) & sampName u51/B:+ isd[l-wAmf 'Open an output file and write the FRED header data $o @?D^ Dim outFile As String Rp<Xu6r outFile = cDir & sampName & "_FRED.txt" =[k9{cVW Open outFile For Output As #1 =az$WRV+7! Print #1, "type bsdf_data" SA&wW\Ym] Print #1, "format angles=deg bsdf=value scale=1" Sph+kiy| e!-'O0-Kw 'Loop the file list, skip the two header lines and write the remaining data to file >'T%=50YH Dim lineArray() As String, curLine As Long K7l{&2>? For Each curFile In fList ?eO|s5r Print "Merging data from file " & curFile 1Jd: %+T ReadFile( cDir & curFile, lineArray ) lR(&Wc\j For curLine = 2 To UBound(lineArray) f*5"Jh@ Print #1, lineArray(curLine) *=
71/&B Next CeJ|z{F\ Next E7<:>Uh f6"j-IW[z 'Close the output file #X8[g _d/ Close #1 4J_%quxO f65Sr"qB3 Print "Finished merging RPC data for sample " & sampName 'I~dJEW7 Print "FRED formatted data file: " & Chr(9) & outFile H xlw1(zS End Sub 9C.cz\E f
LW>-O73 'Utility function to read the contents of a file into an array of strings. 96.Wfx Function ReadFile(ByVal fileName As String, _ d;^?6V ByRef lineArray() As String) As Long O92Y d$S ^
UzF
nW@a ReadFile = -1 ,J^Op
Dim oFSO As Object 6vA5L_ Set oFSO = CreateObject("Scripting.FileSystemObject") q-Qws0\v. Erase lineArray <(MFEIt Q.\>+4]1&& Dim fid As Long P2p^jm
If oFSO.fileexists( fileName ) Then _e3'f:
fid = FreeFile() -^5R51 Open fileName For Input As fid hmH$_YP} lineArray = Split(Input(LOF(fid), fid), vbCrLf) )yP>}ME Close fid g)9/z End If M<)2 Set oFSO = Nothing US|vYd}u+ Return UBound( lineArray ) r Lh
h ,2`d3u^CW End Function K)?^b|D Vk (bU=w Sub GetFileList( ByVal in_dir As String, _ 6&Dvp1`m ByRef in_flist() As String ) ,gvX ~k <@A^C$g 'Redimension the file list array 2z\F m/Z. Erase in_flist #+;=ijyF f#~Re:7.c 'Tracks how many files are found B<LavX>F Dim fCount As Long DX";v
J fCount = 0 IT(c'} h 3&:"*A2 'Recurse directory and search for text files
n@Ag`} Dim f As String vt
N5{C f = Dir$(in_dir & "*.txt") qM0MSwvC= While f <> "" arP+(1U ReDim Preserve in_flist(fCount) 1Q5<6*QL" in_flist(fCount) = f (UZ*36@PJx fCount += 1 L\ %_<2 f = Dir$() ~@8d[Tb Wend 4AYc8Z#' ReDim Preserve in_flist(fCount-1) .;b>
T _kHpM :;. End Sub 6bcrPf}
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