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摘要: _"c:Z !L 1]]#HTwX 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。 $V2.@X .YxcXe3# 背景: ~sbn"OS+ 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。 fMZzR|_18 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。 d td}P~ 图1. RPC Photonics工程漫射体结构及光束投射形状 ]Wdnr1d~8 9 `z^'k& `sPH7^R 步骤 $|pD}
W@FRKDixG 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。 .rs\%M|X ry!0~ir 图2. RPC Photonics工程漫射体不同类型的散射数据 k~HS_b*]d 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) qjI.Sr70 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 h1jEulcMtq 例如下所示: vfPIC! Sample name: EDF-C1-56 drK &
Merging data from file EDF-C1-56 0-0.txt Z"Byv.yq b Finished merging RPC data for sample EDF-C1-56 U t'r^ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt KW-g $Ma 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 L|N[.V9 a. 创建一个新的散射库 /j:fc?yv b. 散射模型命名 Ch,%xs.)G c. 改变散射模型为“Tabulated BSDF”. /XZ\Yy= d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) fs;pX/:FR e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 >{@:p`* f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, kcyT#'=j g. 点击OK -G@:uxB 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 .:V4> V/W{d[86G 4VrL@c
@ 脚本代码: [2Ot=t6] :]+p#l '#Language "WWB-COM" OXIy0].b ".:]?Lvt Option Explicit Mv#\+|p 1x <Pg<F[eDM Sub Main :elTqw>pn mj_V6`m4 'Cleanup >a$b4
pvh ClearOutputWindow() WSV[)-=: z;+LU6V Print "Merging RPC Photonics BSDF Data Files" <9yB& ^ SetTextColor(255,0,0) X Cf!xIv Print "Note: Script should be located in the same folder as the BSDF TXT files." -P[bA0N, Print "Note: Do not run this script multiple times without deleting the output file between executions." \\i$zRi SetTextColor(0,0,0) %^
g(2^ !p$k<?WX c 'Current directory of this script (should be the same as the text files being merged)
fgE Mn; Dim cDir As String f%cbBx^; cDir = MacroDir$ & "\" cu#s}*Ip ):pFI/iC 'Array which will be populated with the list of files to be merged =V*4&OU Dim fList() As String, curFile As String {u_2L_ GetFileList( cDir, fList ) |?Bb{Es vg ^&j0 Print "" W9%B9~\G;+ Print "Files found for merging:" 9d1 Gu" For Each curFile In fList o dTg.m Print Chr(9) & curFile &j_:VP Next rN5;W 6>Ca O 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 9o|#R&0 Dim nameArray() As String, sampName As String )'Yoii{dSU nameArray = Split(fList(0)," 0-0.txt") Hg%8Q@ sampName = nameArray(0) +KKx\m* Print "" nH -1,#`g Print "Sample name: " & Chr(9) & sampName j~VHU89 *&sXC@^@^ 'Open an output file and write the FRED header data Xsit4Ma Dim outFile As String ZFO*D79:K outFile = cDir & sampName & "_FRED.txt" }$T!qMst{ Open outFile For Output As #1 2-!n+#Cdf Print #1, "type bsdf_data" g1zX^^nd,V Print #1, "format angles=deg bsdf=value scale=1" n^7m^1to N>3X! K 'Loop the file list, skip the two header lines and write the remaining data to file #Y'svn1H Dim lineArray() As String, curLine As Long .vJt&@NO For Each curFile In fList s#2<^6 Print "Merging data from file " & curFile $,L,VYN ReadFile( cDir & curFile, lineArray ) At=l>
For curLine = 2 To UBound(lineArray) xPJ
kadu Print #1, lineArray(curLine) n`af2I2 Next 8
y+N l&"V Next wM#BQe3t# <<:a>)6\ 'Close the output file [H8QxJk Close #1
a{%]X('; VG+WVk Print "Finished merging RPC data for sample " & sampName Wy.Xx-3W Print "FRED formatted data file: " & Chr(9) & outFile Jb4A!g5C End Sub ?g~g GQV maopr$r 'Utility function to read the contents of a file into an array of strings. Wr+1G 8 Function ReadFile(ByVal fileName As String, _ 2E
X Rq ByRef lineArray() As String) As Long G
oJ\6&" t4E= ReadFile = -1 fW'U7&O Dim oFSO As Object qn4jy6 Set oFSO = CreateObject("Scripting.FileSystemObject") b 7%O[ Erase lineArray ;4 rTm@6 rt7]~W- Dim fid As Long ,J0BG0jB^u If oFSO.fileexists( fileName ) Then F&I ;E i fid = FreeFile() I N'a5&.. Open fileName For Input As fid :x<'>)6 lineArray = Split(Input(LOF(fid), fid), vbCrLf) zxr|:KC ?& Close fid %Kq`8 End If o>' 1ct Set oFSO = Nothing ;Pi-H,1b Return UBound( lineArray ) T)NnWEB C*I~14 End Function F]SA1ry O7AW9*< Sub GetFileList( ByVal in_dir As String, _ s
s*% 3<
ByRef in_flist() As String ) g,
%xGQ4+ VY9|8g/ 'Redimension the file list array }`,}e 259 Erase in_flist +s'qcC W l+[{# 'Tracks how many files are found 2"~QI xY= Dim fCount As Long
~e!b81 fCount = 0 Evn=3Tw S^Z[w|1 'Recurse directory and search for text files krC4O2Fkj Dim f As String $rh {f< f = Dir$(in_dir & "*.txt") R""P01IZH While f <> "" ?(^HjRUY ReDim Preserve in_flist(fCount) fiq4|!^h in_flist(fCount) = f jB17]OCN fCount += 1 v3i]z9` f = Dir$() d,G:+ Wend BF_R8H,<% ReDim Preserve in_flist(fCount-1) ?1?zmaS ho7L@NR End Sub >*PZ&"}M
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