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摘要: _~q^YZ \4X{\p< 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。 Donf9]&U 0J-ux"kfI 背景: X}FF4jE]D( 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。 DL!s)5!M 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。 0x/V1?gm 图1. RPC Photonics工程漫射体结构及光束投射形状 H#`?toS J+|V[E<x IHmNi>E&/ 步骤 54j
$A \>dG' 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 W>IKy# .Vjpkt:H 图2. RPC Photonics工程漫射体不同类型的散射数据 M_)T=s * 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) e|9Bzli{ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ne*aC_)bT 例如下所示: ] CE2/6Ph Sample name: EDF-C1-56 P.J}\;S T Merging data from file EDF-C1-56 0-0.txt 3yX^R^` Finished merging RPC data for sample EDF-C1-56 P#1y FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt En_8H[<% 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 tqf-,BLh a. 创建一个新的散射库 "n-xsAG b. 散射模型命名 "t`e68{Ls c. 改变散射模型为“Tabulated BSDF”. /qze d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 0zNS;wvv& e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 x;aZ& f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, hlEvL g. 点击OK ^i7a2<
z 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Q{kuB+s C@W0fz w$HC! 脚本代码: 9V!K._Cb {,srj['RS '#Language "WWB-COM" zg"ZXZ G;+0V0K Option Explicit %"V,V3kw4 a$A
S?`L Sub Main XA%?35v~ "0mR*{nF 'Cleanup b,`N;* ClearOutputWindow() >cLZP#^\2E p]HtJt|] Print "Merging RPC Photonics BSDF Data Files" ibL;99 # SetTextColor(255,0,0) `R;XN- Print "Note: Script should be located in the same folder as the BSDF TXT files." m0YDO0 Print "Note: Do not run this script multiple times without deleting the output file between executions." tzPe*|m< SetTextColor(0,0,0) ?y
kIi/ L;<]wKs 'Current directory of this script (should be the same as the text files being merged) cl5 :|) Dim cDir As String 5j%jhby? cDir = MacroDir$ & "\" c-{]H8$v WX9BS$}0 'Array which will be populated with the list of files to be merged *}=W wG Dim fList() As String, curFile As String yR-.OF,c GetFileList( cDir, fList ) 7IRn 5@\<:Zmi Print "" Zs)9OJu Print "Files found for merging:" NKN!X/P For Each curFile In fList lC{m;V2 Print Chr(9) & curFile eS M!_2 Next Z~<V>b /);6 j,x 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. f.WtD`Oas Dim nameArray() As String, sampName As String `!BUd nameArray = Split(fList(0)," 0-0.txt") DzMk eX sampName = nameArray(0) GfV9Ox Print "" 7P]pk=mo Print "Sample name: " & Chr(9) & sampName L;;x%> ZO}*^ 'Open an output file and write the FRED header data z> SCv;Q Dim outFile As String B Xp3u|t outFile = cDir & sampName & "_FRED.txt" w*x}4wW Open outFile For Output As #1 $U1'n@/J Print #1, "type bsdf_data" 9dAsXEWh Print #1, "format angles=deg bsdf=value scale=1" i "xq SLf= K7U<~f$OiN 'Loop the file list, skip the two header lines and write the remaining data to file 1Y_fX Dim lineArray() As String, curLine As Long !G37K8&&* For Each curFile In fList .
x$` i Print "Merging data from file " & curFile gxiJ`.D= ReadFile( cDir & curFile, lineArray ) j"]%6RwM] For curLine = 2 To UBound(lineArray) ;6Z?O_zp4 Print #1, lineArray(curLine) |?8wyP Next #&^+hx| Next Wp ]u0w vv3?ewr
y 'Close the output file `|4{|X*U. Close #1 -HOCxR [(1O_X(M Print "Finished merging RPC data for sample " & sampName am=56J$ig Print "FRED formatted data file: " & Chr(9) & outFile 5|Uub, End Sub 3N-(`[m{E 15B$Sp!/`e 'Utility function to read the contents of a file into an array of strings. Nt)9-\T Function ReadFile(ByVal fileName As String, _ Eyuc~[ ByRef lineArray() As String) As Long 1FuChd 0x84 Ah) ReadFile = -1 aLr^uce] Dim oFSO As Object 4o_1F).\D Set oFSO = CreateObject("Scripting.FileSystemObject") M30_b8[Y_ Erase lineArray ;YB8X&H$ ]l4\/EW6 Dim fid As Long @{j-B
IRZ0 If oFSO.fileexists( fileName ) Then K_xn> fid = FreeFile() ls=<c< Open fileName For Input As fid U6{ RHS[ lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0\/7[nwS Close fid d(&vIjy End If TYp{nWwi Set oFSO = Nothing nV'B!q Return UBound( lineArray ) sM4N`$Is23 0pu'K)Rb End Function "l!"gc87 Z|)~2[Roa Sub GetFileList( ByVal in_dir As String, _ oY{*X6:6< ByRef in_flist() As String ) Wd[XQZ< ,y^By_1wS 'Redimension the file list array {T$;BoR#O
Erase in_flist Cnc77EUD z*FlZLHY 'Tracks how many files are found bw@tA7Y Dim fCount As Long 371E S4 fCount = 0
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X(bb1 'Recurse directory and search for text files NKd):>d% Dim f As String RgEUTpX f = Dir$(in_dir & "*.txt") GU!|J71z While f <> "" n32?GRp ReDim Preserve in_flist(fCount) ]TGJ|X in_flist(fCount) = f }L@YLnc% fCount += 1 A:N!H_x f = Dir$() UF}fmDi Wend <F&S ReDim Preserve in_flist(fCount-1) &%^[2^H8" L/V3sSt End Sub |>VHV} 4)<
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