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摘要: @"aqnj>+ :=:m4UJb 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。 'sa>G YQR[0Y&e= 背景: Bf3 QB]9 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。 {m_y< 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。 1q|iw 图1. RPC Photonics工程漫射体结构及光束投射形状 J(9{P/ /1xBZfrN {}H/N 步骤 ~sNBklK NE|Q0g 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。 E<@N4%K_Q nPjK=o`KR 图2. RPC Photonics工程漫射体不同类型的散射数据 5eM{>qr} 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) " z -tL 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 FyNm1QNy^ 例如下所示: m;ju@5X Sample name: EDF-C1-56 $s"-r9@q Merging data from file EDF-C1-56 0-0.txt m\MI 6/ Finished merging RPC data for sample EDF-C1-56 +&<k}Mz FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt #6C<P!]V 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 u>*qDr*d a. 创建一个新的散射库 x4v&%d=M b. 散射模型命名 :G&:v c. 改变散射模型为“Tabulated BSDF”. XR$i:kL,, 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 ) |fo#pwX 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。 ``>z8t[ks 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, LyG`q3@ g. 点击OK & u6ydN1xe 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 #L&/o9| G?Za/G Zu94dFP 脚本代码: $"?$r _`,ZI{.J^ '#Language "WWB-COM" .eyJ<b9
{~XAg~ Option Explicit 0-/@-qV\ QvJ29 Sub Main ,V{Bpr }nSu7)3$B 'Cleanup =,X*40= ClearOutputWindow() HYv-5:B Hoi~(Vc. Print "Merging RPC Photonics BSDF Data Files" 7\gu; [n SetTextColor(255,0,0) T# gx2Y Print "Note: Script should be located in the same folder as the BSDF TXT files." ^AERGB\36 Print "Note: Do not run this script multiple times without deleting the output file between executions." ^oNcZK> SetTextColor(0,0,0) +Eel|)Z*Q Y' 5X4Ks| 'Current directory of this script (should be the same as the text files being merged) RMdU1@ Dim cDir As String \S{ihS@J cDir = MacroDir$ & "\" T&}KUX~Q/ XV,ce~ro[ 'Array which will be populated with the list of files to be merged XJk~bgO* Dim fList() As String, curFile As String ,k(B>O ~o GetFileList( cDir, fList ) pimI)1 !$' {aUv>T"c Print ""
b`f6(6 Print "Files found for merging:" md|I?vk For Each curFile In fList P,rLyx Print Chr(9) & curFile
:z6? Next A$L:,b( Nnoj6+b 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ]v:"
Dim nameArray() As String, sampName As String
GB,ub*| nameArray = Split(fList(0)," 0-0.txt") BgY|v
[M& sampName = nameArray(0) r$ I k*R Print "" <N3~X,ch Print "Sample name: " & Chr(9) & sampName 3}C-Hg+gt Ds{bYK_y 'Open an output file and write the FRED header data `,4YPjk^ Dim outFile As String u#Bj#y! outFile = cDir & sampName & "_FRED.txt" `S4G+j>u6 Open outFile For Output As #1 j)Z0K$z= Print #1, "type bsdf_data" K1-RJj\L Print #1, "format angles=deg bsdf=value scale=1" fgHsg@33N "#iO{uMWb 'Loop the file list, skip the two header lines and write the remaining data to file ZVit]3hd Dim lineArray() As String, curLine As Long 1&Ma`M(' For Each curFile In fList uzLm TmM+ Print "Merging data from file " & curFile JV+Uy$P! ReadFile( cDir & curFile, lineArray ) m~&>+q ^7 For curLine = 2 To UBound(lineArray) p:ZQ*Ue Print #1, lineArray(curLine) X7gB.=\X Next Lmw)Ts> Next G=C2l#
Ae! G/w@2lYx 'Close the output file }g[Hi` Close #1 ?DnQU"_$ F)19cKx7 Print "Finished merging RPC data for sample " & sampName Iv{iJoe;UH Print "FRED formatted data file: " & Chr(9) & outFile j
J54<.D End Sub 7
Rc/<,X F>E_d<m 'Utility function to read the contents of a file into an array of strings. S'>KGdF Function ReadFile(ByVal fileName As String, _ "u{ymJ]t ByRef lineArray() As String) As Long ?*<1B %f(4jQ0I ReadFile = -1 E^~ {thf Dim oFSO As Object ,eL&Ner Set oFSO = CreateObject("Scripting.FileSystemObject") #kJ8 qN Erase lineArray R1.Yx? "g(q)u > Dim fid As Long h-o;vC9fC If oFSO.fileexists( fileName ) Then Z$35`:x&h fid = FreeFile() jT;'T$ Open fileName For Input As fid j9cB<atL lineArray = Split(Input(LOF(fid), fid), vbCrLf) ONc#d'-L Close fid rAgp cp} End If PC%_^BDW Set oFSO = Nothing 'SIc2H Return UBound( lineArray ) :MH=6 'OMl9}M End Function 7mb5z/N sr~VvciIy Sub GetFileList( ByVal in_dir As String, _ D^{jXNDNO ByRef in_flist() As String ) h[C XH" !=+;9Ry$z 'Redimension the file list array !
e?=g%( Erase in_flist 'n?"f |G IY?o \vC 'Tracks how many files are found C ?\HB#41 Dim fCount As Long jank<Q&w fCount = 0 d 5hx%M >q&e.-qL 'Recurse directory and search for text files -{yG+1 Dim f As String
Fo]]j= f = Dir$(in_dir & "*.txt") }E)t,T> While f <> "" za8+=? ReDim Preserve in_flist(fCount) M@0S*[O{" in_flist(fCount) = f 26j-1c!NGd fCount += 1 eJEcLK3u f = Dir$() LC0-O1 Wend J/[PA[Rf ReDim Preserve in_flist(fCount-1) t4-0mNBZt$ *mN8Qd End Sub \,`iu=YZv
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