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摘要: LJ\uRfs 1-.6psE 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。 s\@RJ[(<
N7=lSBm 背景: *S%~0= 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。 Py_yIwQqg 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。 (kCzz-_\ 图1. RPC Photonics工程漫射体结构及光束投射形状 `bY>f_5+ ~
HN {DlQTgP 步骤 bys5IOP{]o =r:(ga 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。 .FYxVF. 76epkiz;= 图2. RPC Photonics工程漫射体不同类型的散射数据 /u?ZwoTzY 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) '1P~"P3 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 .6C9N{?Tqf 例如下所示: :O)\+s- Sample name: EDF-C1-56 [/E|n[Bx Merging data from file EDF-C1-56 0-0.txt n4Xh}KtH Finished merging RPC data for sample EDF-C1-56 (r*"}"ZG FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt aNUU' [ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 7C / ^Gw a. 创建一个新的散射库 T&'p5h=l b. 散射模型命名 vd{ban9 c. 改变散射模型为“Tabulated BSDF”. h8XoF1wuw 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 ) d%,@,>>) 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。 H^ds<I<) 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, &s^t~>Gpr g. 点击OK LS:^K 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 .RW&=1D6 zQ~N(Jj?h utzf7?nIS 脚本代码: *q-VY[2 X*w7q7\8-: '#Language "WWB-COM" .+)
AeGh :P8X?C63W] Option Explicit J.(mg
D W:VX^8</ Sub Main %`bn=~T^ Ak kth*p 'Cleanup Cu!S|Xj. ClearOutputWindow() f
= 'AI s5\<D7 Print "Merging RPC Photonics BSDF Data Files" ~KYA{^`* SetTextColor(255,0,0) RF }R~m9] Print "Note: Script should be located in the same folder as the BSDF TXT files." NT=)</v Print "Note: Do not run this script multiple times without deleting the output file between executions." GJ\bZ"vDo SetTextColor(0,0,0) .I Io cTja<*W^xv 'Current directory of this script (should be the same as the text files being merged) U!jRF Dim cDir As String Z|B`n
SzH cDir = MacroDir$ & "\" u
p zBd] $\#wsI( 'Array which will be populated with the list of files to be merged kl|m @Nxp Dim fList() As String, curFile As String *JOp)e0b GetFileList( cDir, fList ) T"e"?JSRJ [dy0aR$>d Print "" <9[>+X Print "Files found for merging:" E J&w6),d For Each curFile In fList )`#SMLMy~ Print Chr(9) & curFile f3*SIKi Next G[+{[W ^YB3$:@$U 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. zUA
- Dim nameArray() As String, sampName As String U9XOs)^ nameArray = Split(fList(0)," 0-0.txt") **]=!W sampName = nameArray(0) $'w>doUlA Print "" fM3ZoH/ Print "Sample name: " & Chr(9) & sampName ^V"08 0KN'\KE 'Open an output file and write the FRED header data km,@yU Dim outFile As String |H%,>r`9S outFile = cDir & sampName & "_FRED.txt" _o-01gu. Open outFile For Output As #1 q+)s Print #1, "type bsdf_data" #U6~U6@ Print #1, "format angles=deg bsdf=value scale=1" W"g@*B'| 8p]Krs: 'Loop the file list, skip the two header lines and write the remaining data to file !Xzy: Dim lineArray() As String, curLine As Long `8D'r|=`Eh For Each curFile In fList Cp]q>lM" Print "Merging data from file " & curFile Lmc"qFzK ReadFile( cDir & curFile, lineArray ) }^PdW3O*m, For curLine = 2 To UBound(lineArray) N
lB%Qu Print #1, lineArray(curLine) 51puR8AG> Next k&o1z'<C Next -l$-\(,M`# ^S^7u 'Close the output file bAL!l\&2 Close #1 yV5AVMo w]Ci%W( Print "Finished merging RPC data for sample " & sampName WC
5v#*Jd Print "FRED formatted data file: " & Chr(9) & outFile $c24l J#/ End Sub ]|/\Sd ?)XPY< 'Utility function to read the contents of a file into an array of strings. .8Gmy07 Function ReadFile(ByVal fileName As String, _ oW8 hC ByRef lineArray() As String) As Long z_en. =#{i;CC% ReadFile = -1 A[X~:p.^G Dim oFSO As Object qGKQrb,K Set oFSO = CreateObject("Scripting.FileSystemObject") /,2${$c! Erase lineArray #:M)a?E/% ]0)=0pc]E Dim fid As Long w7X], auRC If oFSO.fileexists( fileName ) Then 7I<] ;j fid = FreeFile() w(vda0 Open fileName For Input As fid -(+/u . lineArray = Split(Input(LOF(fid), fid), vbCrLf) gDjs:]/YR Close fid 0YVkq?1x9 End If Ga}&% Set oFSO = Nothing 5x; y{qT Return UBound( lineArray ) sz%'=J~!V
Rw\S-z/ End Function 0`dMT>&I wH Q$F(by Sub GetFileList( ByVal in_dir As String, _ G\:^9!nwY~ ByRef in_flist() As String ) , *A', jPf*qe>U 'Redimension the file list array 7J@D})si Erase in_flist #7~M1/eH=t $!_]mz6* 'Tracks how many files are found uZ(j"y Dim fCount As Long v"&Fj fCount = 0 h[0,/`qb{ 9ZEF%&58Y 'Recurse directory and search for text files er?'o1M Dim f As String 6n.W5
1g(s f = Dir$(in_dir & "*.txt") OyG$ ]C While f <> "" 0=r.I}x ReDim Preserve in_flist(fCount) Ex
?)FL$4 in_flist(fCount) = f ddMSiwbY) fCount += 1 ^rc!X]C9 f = Dir$() yH8
N 8 Wend .1.Bf26}d ReDim Preserve in_flist(fCount-1) f-?00*T ~ (xIG End Sub #qk A*WP %:/_O*~)Yg byYdX'd. QQ:2987619807 eyZ /%4'q
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