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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。 7cQw?C yE/I)GOQjs 背景: _\]UA?0 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。 O4 URr 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。 N.J:Qn`( 图1. RPC Photonics工程漫射体结构及光束投射形状
>CA1Ub&ls !LESRh? p`C5jfI 步骤 )2\a5iH
RT9|E80 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。 wIPDeC4 D^4V"rq 图2. RPC Photonics工程漫射体不同类型的散射数据
MQI= 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) DvKMb-*S 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 ba.OjK@ 例如下所示: o
W [-? Sample name: EDF-C1-56 N* QI>kzU Merging data from file EDF-C1-56 0-0.txt ;0WlvKF Finished merging RPC data for sample EDF-C1-56 J#^M FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt BW1O1zIh\ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 #-8/|_* a. 创建一个新的散射库 riQ?'!a7 b. 散射模型命名 ![Y$[l c. 改变散射模型为“Tabulated BSDF”. wjs7K|PK d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ~'Hwszpb e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 cwM0Z6
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 4cL=f g. 点击OK 34:=A0z 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 dDTt _B w-m2N-"=' QX/`s3N 脚本代码: U^S0H(> xr -scdh2 '#Language "WWB-COM" P#]jPW jKs8i$q Option Explicit -A~<IyPt -.G0k*[d Sub Main gqamGLK ?z.`rD$}(n 'Cleanup }s9J+m ClearOutputWindow() #Ki@=* ^|2qD:
; Print "Merging RPC Photonics BSDF Data Files" e!yt<[ph SetTextColor(255,0,0) xC]/i(+bA Print "Note: Script should be located in the same folder as the BSDF TXT files." :JmNy< Print "Note: Do not run this script multiple times without deleting the output file between executions." o@-cT`HP SetTextColor(0,0,0) 0o`o'Z V=c B:SRHd{*Wu 'Current directory of this script (should be the same as the text files being merged) #:X:~T Dim cDir As String :8FH{sqR cDir = MacroDir$ & "\" nDfDpP& "@_f>3z 'Array which will be populated with the list of files to be merged ]](hwj Dim fList() As String, curFile As String J=Z"sU= GetFileList( cDir, fList ) 3FfS+q*3S L!RLw4
Print "" Z(cgI5Pu
Print "Files found for merging:" 7Udr~0_) For Each curFile In fList %vI]"a@ Print Chr(9) & curFile lH8?IkK,g Next 0n%`Xb0q GbhaibkO 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 78kk"9h' Dim nameArray() As String, sampName As String aE}u5L$# nameArray = Split(fList(0)," 0-0.txt") i@6 kIC sampName = nameArray(0) E6uIp^E Print "" Zv_<*uzKZ Print "Sample name: " & Chr(9) & sampName u=5^xpI<D ,k4
(b 'Open an output file and write the FRED header data I[/u5V_b' Dim outFile As String @W8RAS~ outFile = cDir & sampName & "_FRED.txt" kE1u-EA Open outFile For Output As #1 _~r>C Print #1, "type bsdf_data" q0o6%c:gW Print #1, "format angles=deg bsdf=value scale=1" *@< jJP4 ( Qnn 'Loop the file list, skip the two header lines and write the remaining data to file V*)gJg Dim lineArray() As String, curLine As Long _?8T'?-1 For Each curFile In fList UaB!,vs3st Print "Merging data from file " & curFile U -(d~]$ ReadFile( cDir & curFile, lineArray ) %NuS!v> For curLine = 2 To UBound(lineArray) is,_r(S Print #1, lineArray(curLine) Xg"=,j2 Next 2X:n75() Next t_3XqjuA 3s+D
x$Ud 'Close the output file 2KU[Yd Close #1 ZCa?uzeo] D0~mu{;c$ Print "Finished merging RPC data for sample " & sampName '<O&
: Print "FRED formatted data file: " & Chr(9) & outFile @jfd.? RK! End Sub 9
HuE'(wQ K.k=\N 'Utility function to read the contents of a file into an array of strings. S;=
D/)[mr Function ReadFile(ByVal fileName As String, _ tkA '_dcIC ByRef lineArray() As String) As Long hP #>`)aNY $8b/"Qm ReadFile = -1 #R &F Dim oFSO As Object +=*ZH`qX Set oFSO = CreateObject("Scripting.FileSystemObject") z5?xmffB Erase lineArray N.uw2Y% <X:7$v6T| Dim fid As Long \JX8`]|& If oFSO.fileexists( fileName ) Then 75a3H` fid = FreeFile() 6g)21Mh# Open fileName For Input As fid 1L3L!@ lineArray = Split(Input(LOF(fid), fid), vbCrLf) s iC/k* Close fid RszqDm End If ZT!DTb
B Set oFSO = Nothing HyB!8M| Return UBound( lineArray ) YS&3+Tp ~"8b\oLW End Function J?V8uEly Vg0Rc t Sub GetFileList( ByVal in_dir As String, _ ~R3@GaL1 ByRef in_flist() As String ) 94Are< &R2 5J$ 'Redimension the file list array ~ u jY+{ Erase in_flist X ZfT;!wF& & GX
pRo 'Tracks how many files are found /K1YDq<= Dim fCount As Long ZPHB$]ri fCount = 0 )jvYJ9s 2!}5shB 'Recurse directory and search for text files )D Y?Y-n Dim f As String yy@g=<okt\ f = Dir$(in_dir & "*.txt") yqZKn=1: While f <> "" V|Smk;G ReDim Preserve in_flist(fCount) dG\dGSZ\h in_flist(fCount) = f !CUrpr/* fCount += 1 &G:#7HX@- f = Dir$() YFeF(k!!n Wend w\!aKeP'
ReDim Preserve in_flist(fCount-1) rz5AIe>Hm \G:\36l End Sub N"Q-xK