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摘要: "3/&<0k )3k?{1: 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。 ?[7KN8$ |Wr$5r 背景: rFaG-R Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 \/ipYc FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 H$.K
图1. RPC Photonics工程漫射体结构及光束投射形状 +QNsI2t;r glLoYRTi
a|#TnSk 步骤 8N \<o7t% yK-DzAv 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。 inh
J|pe" $O%"[w 图2. RPC Photonics工程漫射体不同类型的散射数据 b0Dco0U( 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) [iZH[7&j 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 4:5M,p 例如下所示: m`}mbm^ Sample name: EDF-C1-56
1D_&n@ Merging data from file EDF-C1-56 0-0.txt Cz
&3=),G Finished merging RPC data for sample EDF-C1-56 Ft38)T"2R\ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt [:uHe#L 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Ec@cW6g(% a. 创建一个新的散射库 %%NT m b. 散射模型命名 F?[1m2 c. 改变散射模型为“Tabulated BSDF”. L9-Jwy2(> d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) [S1 b\f# e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 c0Pj})- f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, f;AI4:#I g. 点击OK YmOj.Q& 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 fv k(eWB k||dX(gl S`$%C=a. 脚本代码: "=1gA~T Tdm|=xI
'#Language "WWB-COM" (cyvE}g zc$}4o Option Explicit L^*f$Balz h8X[*Wme Sub Main 1\~I "$} D, Gv nfY 'Cleanup &>]U c%JK ClearOutputWindow()
JJmW%%]i }xBDyr63 Print "Merging RPC Photonics BSDF Data Files" T*%rhnTv0 SetTextColor(255,0,0) <bb!BS&w Print "Note: Script should be located in the same folder as the BSDF TXT files." Tgax ZW Print "Note: Do not run this script multiple times without deleting the output file between executions." H6{Bx2J1* SetTextColor(0,0,0) bX$1PYX ?dbSm3 'Current directory of this script (should be the same as the text files being merged) qS9<_if2 Dim cDir As String z~3GgR"1d cDir = MacroDir$ & "\" J]#rh5um WMC\J(@. 'Array which will be populated with the list of files to be merged m#8(l{3| Dim fList() As String, curFile As String ar#73f GetFileList( cDir, fList ) GcDA0%i (xHu@l!] Print "" Ar[|M2| Print "Files found for merging:" K1^7v}P For Each curFile In fList TA0(U$ 4 Print Chr(9) & curFile /#
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Next ~\<$H' Li]96+C$} 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. e4,SR(O> Dim nameArray() As String, sampName As String !#:5^":; nameArray = Split(fList(0)," 0-0.txt") :L@n(buRN sampName = nameArray(0) !Ve0 :$ Print "" \8=)X} ) Print "Sample name: " & Chr(9) & sampName }8"
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_%<U 'Open an output file and write the FRED header data NLK1IH# Dim outFile As String i%[ gNh outFile = cDir & sampName & "_FRED.txt" |Y05 *!\P* Open outFile For Output As #1 0&j90J$` Print #1, "type bsdf_data" V:'F_/&X? Print #1, "format angles=deg bsdf=value scale=1" a#"orc j ;Mo_B9 'Loop the file list, skip the two header lines and write the remaining data to file JRw,${W Dim lineArray() As String, curLine As Long {0w2K82 For Each curFile In fList :;.^r,QAI Print "Merging data from file " & curFile `WN80d\)& ReadFile( cDir & curFile, lineArray ) w2UEU5% For curLine = 2 To UBound(lineArray) RrvC}9ar Print #1, lineArray(curLine) \fUX_0k9, Next Vx2/^MiXy Next ((+XzV> @B(oq1i@ 'Close the output file l=p_ Close #1 JJ7A`
; :>JfBJ]| Print "Finished merging RPC data for sample " & sampName P O 5Wi Print "FRED formatted data file: " & Chr(9) & outFile vRe X7 End Sub !5(DU~S*@S hdCd:6 'Utility function to read the contents of a file into an array of strings. ]sqLGmUL Function ReadFile(ByVal fileName As String, _ p|.5;)%| ByRef lineArray() As String) As Long 4qp|g'uXT F`m}RL]g ReadFile = -1 YB7n}r23 Dim oFSO As Object WM?-BIlT= Set oFSO = CreateObject("Scripting.FileSystemObject") ! e$ZOYe Erase lineArray :Q> e54]'& XDJE]2^52? Dim fid As Long k:Y\i]#yP If oFSO.fileexists( fileName ) Then =~h b& fid = FreeFile() ,\iHgsZ Open fileName For Input As fid TLVsTM8P lineArray = Split(Input(LOF(fid), fid), vbCrLf) QF/_?Tm4 Close fid G|KA!q End If i,r:R
g~ Set oFSO = Nothing `
= O Return UBound( lineArray ) BYX c
'K fV|uKs(W End Function x)Bbo9J 0>Snps3*Z Sub GetFileList( ByVal in_dir As String, _ > v%.q]E6n ByRef in_flist() As String ) kEnGr6e
Pd~=:4 'Redimension the file list array Kh\ 7%>K# Erase in_flist uL^; i"" XLt/$Caf 'Tracks how many files are found B223W_0"o Dim fCount As Long ^#<L!yo^ fCount = 0 &]o-ZZX Bk~C$'x4 'Recurse directory and search for text files 'G l~P><e Dim f As String W+!UVUpW f = Dir$(in_dir & "*.txt") ]nUr E6 While f <> "" C7ivAh ReDim Preserve in_flist(fCount) {IJ;)<>&VE in_flist(fCount) = f E+O{^C= fCount += 1 'c7nh{F f = Dir$() 8l5>t Wend Pj
<U|\-? ReDim Preserve in_flist(fCount-1) uKP4ur@1 uL/wV~g End Sub 71R,R, Ahwi >;I8w( QQ:2987619807 X?'cl]1?
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