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摘要: hj s[$,1 6f(K'v 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。 &E0P`F,GQA 83e{rcs 背景: ,~>A>J 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。 ~}PB&`%7 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。 "'~55bG 图1. RPC Photonics工程漫射体结构及光束投射形状 @.@O# zq _*)V E:!?A@Fy 步骤 oYI7 .w rK7m( 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。 73
ix4C z^'3f!:3 图2. RPC Photonics工程漫射体不同类型的散射数据 \%g#
__\ 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) :VGvL"Kro 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 &3#19v7/ 例如下所示: 7&-B6Y4 Sample name: EDF-C1-56 vu Vcv
Merging data from file EDF-C1-56 0-0.txt 2guWWFS Finished merging RPC data for sample EDF-C1-56 L/t'|<m FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt $t}t'uJ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 86y)+h` a. 创建一个新的散射库 K*NCIIDh b. 散射模型命名 A0~uv4MC c. 改变散射模型为“Tabulated BSDF”. xy;u"JY* d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ^}8qPBz e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 dTcrJ|/Y f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, =Kqb
V{! g. 点击OK .ww~'5b0 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 HtFc+%= }04EM vVBu/) 脚本代码: X?kw=x{2P JB[n]| '#Language "WWB-COM" dX^ ^
@7 yUd>EnQna Option Explicit \%[sv@P9s F/.nr Sub Main QPr29 _ x8gEK8 'Cleanup ^E-BB 6D ClearOutputWindow() 5\S
s`#g l4:B( Print "Merging RPC Photonics BSDF Data Files" CvkZ<i){ SetTextColor(255,0,0) x6N)T4J( Print "Note: Script should be located in the same folder as the BSDF TXT files." A~0eJaq+ Print "Note: Do not run this script multiple times without deleting the output file between executions." Pnl+.? SetTextColor(0,0,0) ]40@yrc !:BmDX[<n 'Current directory of this script (should be the same as the text files being merged) ~[a6 Dim cDir As String ?E +[ cDir = MacroDir$ & "\" Z /G`8|A 7H=V|Btnc 'Array which will be populated with the list of files to be merged K)DpC* j Dim fList() As String, curFile As String Iy[TEB GetFileList( cDir, fList ) 2J;_9
g&M o|`%>&jP Print "" rvEX;8TS Print "Files found for merging:" a)lS)*Y For Each curFile In fList E!"N}v Print Chr(9) & curFile {f1iys'Om Next (Y!{ UNq5 CqFk(Td9-D 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. %H/V
iC Dim nameArray() As String, sampName As String RwyX,| nameArray = Split(fList(0)," 0-0.txt") X^o0t^
sampName = nameArray(0) 2pQ29 Print "" xwSi.~. Print "Sample name: " & Chr(9) & sampName o{[w6^D7 4(nwi[1Y 'Open an output file and write the FRED header data y?Cq{( Dim outFile As String XU5GmGu_+ outFile = cDir & sampName & "_FRED.txt" (ay((|) Open outFile For Output As #1 0+{CN|0 Print #1, "type bsdf_data" }j`#s Print #1, "format angles=deg bsdf=value scale=1" P!xN]or]u W @
?* ~ 'Loop the file list, skip the two header lines and write the remaining data to file nVyV]'-z Dim lineArray() As String, curLine As Long 8*&|Q1`K: For Each curFile In fList rK~Obv Print "Merging data from file " & curFile )=TS)C4 ReadFile( cDir & curFile, lineArray ) ;s\ck:Xg For curLine = 2 To UBound(lineArray) /0 2-0mNv Print #1, lineArray(curLine) wG LSei-s Next Xte"tf9(C Next K#;EjR4H :meq4!g{1 'Close the output file wX+KW0|> Close #1 )0XJOm zvOSQxGQ Print "Finished merging RPC data for sample " & sampName O>,Rsj!e Print "FRED formatted data file: " & Chr(9) & outFile Lq#$q>!K End Sub \f4JIsZ-& \Z8:^ct.P 'Utility function to read the contents of a file into an array of strings. GUcGu5tw: Function ReadFile(ByVal fileName As String, _ 9s2N!bx ByRef lineArray() As String) As Long vYNu=vnM ]I:h4hgw ReadFile = -1 ydMfV- Dim oFSO As Object hQ _gOI Set oFSO = CreateObject("Scripting.FileSystemObject") FA$1&Fu3Y Erase lineArray G[lNgVbU@ kWZ/O Dim fid As Long rUDMQxLruV If oFSO.fileexists( fileName ) Then =bh.V@* fid = FreeFile() "JpnmE[` Open fileName For Input As fid m\eYm;RVj lineArray = Split(Input(LOF(fid), fid), vbCrLf) QHPC?a6CD Close fid f9a_:]F End If N
VBWF Set oFSO = Nothing s#>``E! Return UBound( lineArray ) F.$NYr/|y V9/P kuT End Function ;%mYsQ {GhM,-%e Sub GetFileList( ByVal in_dir As String, _ q3e^vMK" ByRef in_flist() As String ) -_T@kg[0zB !g7bkA 'Redimension the file list array bR}=bp4K Erase in_flist \[Q* d Np2.X+ 'Tracks how many files are found |.{[%OJP Dim fCount As Long uoMDf{d fCount = 0 L@x#:s= ByivV2qd{ 'Recurse directory and search for text files ~T:L0||.%9 Dim f As String i1ss}JJp* f = Dir$(in_dir & "*.txt") c=u'#|/eb While f <> "" !A=>B=.|D ReDim Preserve in_flist(fCount) <?Y.w1 in_flist(fCount) = f ]vUTb9>{? fCount += 1 vJfj1 f f = Dir$() 57rH`UFXH Wend tish%Qnpd ReDim Preserve in_flist(fCount-1) o}6d[G> "2>_eZ#b End Sub W8Aii'Q8C/
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