-
UID:317649
-
- 注册时间2020-06-19
- 最后登录2025-09-15
- 在线时间1851小时
-
-
访问TA的空间加好友用道具
|
摘要: P
@~) 9W LMNmG]#! 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。 T7^?j :kJ/ F+]cFx,/ 背景: C[,&Y&`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。 Js&.p9S2 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。 `PT'Lakf;3 图1. RPC Photonics工程漫射体结构及光束投射形状 q8}he~a h!7Lvh`o tC5>K9Ed 步骤 zJ_y"bt ')TS'p,n 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。 nE56A#,Q, hOYP~OR 图2. RPC Photonics工程漫射体不同类型的散射数据 CY\D.Eow 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)
D,()e^o 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 r)Ja\; 例如下所示: 8v)iOPmDC Sample name: EDF-C1-56 K,,'{j2#f Merging data from file EDF-C1-56 0-0.txt q7pe\~q Finished merging RPC data for sample EDF-C1-56 ;?v&=Z't. FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt V}ls|B$Y 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ~sdM~9@
' a. 创建一个新的散射库 J(SGa Hm@ b. 散射模型命名 wlEK"kKU c. 改变散射模型为“Tabulated BSDF”. aoBiN_ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) @p@b6iLpO e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 .vie#,la f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, Fd<eh(g9P g. 点击OK &(m01 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ByacSN 5n[''#D RIDl4c
[ 脚本代码: SX&Q5:
ornU8H` '#Language "WWB-COM" @aP1[( m %LuA:{EVD Option Explicit . I."q MpTOC&NG%s Sub Main '>HLE) l f@k.4aS 'Cleanup r5y*SoD! ClearOutputWindow() EMDYeXpV W\<HUd Print "Merging RPC Photonics BSDF Data Files" {w@9\LsU SetTextColor(255,0,0) !3{;oU%* Print "Note: Script should be located in the same folder as the BSDF TXT files." <`?%Cz AO Print "Note: Do not run this script multiple times without deleting the output file between executions." d5`D[,]d SetTextColor(0,0,0) ay#f\P!1 cgO<%_l3` 'Current directory of this script (should be the same as the text files being merged) wB:<ICm Dim cDir As String AY;[v.Ff4 cDir = MacroDir$ & "\" yq1G6hw '<>?gE0Cd 'Array which will be populated with the list of files to be merged c7.M\f P
Dim fList() As String, curFile As String Gzs$0Ki= GetFileList( cDir, fList ) Qkw?QV-`k /(?s\}O Print "" ";/ogFi Print "Files found for merging:" U\!9dhx For Each curFile In fList c|K:oi,z Print Chr(9) & curFile z|t2;j[ Next 7-0j8$` Zy.3yQM9i 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. TM|PwY Dim nameArray() As String, sampName As String <AK9HPxP nameArray = Split(fList(0)," 0-0.txt") 9aX!<Z sampName = nameArray(0) :98:U~d1 Print "" y(#6nG@S Print "Sample name: " & Chr(9) & sampName skU
}BUK6 d\zUtcJwC 'Open an output file and write the FRED header data ZUvc|5] Dim outFile As String nPDoK!r' outFile = cDir & sampName & "_FRED.txt" ]re}EB\Rs Open outFile For Output As #1 c?KIHZ0 Print #1, "type bsdf_data" itg"dGDk Print #1, "format angles=deg bsdf=value scale=1" `5"3Cj"M ML0_Uc3en 'Loop the file list, skip the two header lines and write the remaining data to file 8n:N#4Dh^ Dim lineArray() As String, curLine As Long Q- w_@~ For Each curFile In fList suYbD!`( Print "Merging data from file " & curFile g9=_^^Tg ReadFile( cDir & curFile, lineArray ) ddbQFAQQQ For curLine = 2 To UBound(lineArray) NNwGRoDco Print #1, lineArray(curLine) 2dK:VC4U Next 6 !N2B[9 Next :DeJnE y7R=zkd
C9 'Close the output file H/Rzs$pnv Close #1 8'NT_NPNb OJh MM- Print "Finished merging RPC data for sample " & sampName 9p1@Lfbj Print "FRED formatted data file: " & Chr(9) & outFile '&2-{Y [! End Sub `m#i|8 %;|dEY 'Utility function to read the contents of a file into an array of strings. %$'fq*8b Function ReadFile(ByVal fileName As String, _ eKo=g|D ByRef lineArray() As String) As Long owI:Qs_/4 V-E 77u6{0 ReadFile = -1 -F 9xPw Dim oFSO As Object E25w^x2 Set oFSO = CreateObject("Scripting.FileSystemObject") 'Sesh'2
/ Erase lineArray d+6q%U (_6JQn Dim fid As Long id" l" If oFSO.fileexists( fileName ) Then jQ7-M4qO/ fid = FreeFile() a5/Dz&>j6 Open fileName For Input As fid #?,"/Btq lineArray = Split(Input(LOF(fid), fid), vbCrLf) tR2%oT>h Close fid lL
50PU End If =''b `T$ Set oFSO = Nothing 0c8_& Return UBound( lineArray ) EziGkbpd@ wAJ=rRI End Function B|8|f(tsSa [LUqF?K& Sub GetFileList( ByVal in_dir As String, _ iq^;c syKb ByRef in_flist() As String ) B(5>H2 `M. I.Z_ 'Redimension the file list array 2@@evQ Erase in_flist .p?SPR YpRhl(| 'Tracks how many files are found P=L@!F+s Dim fCount As Long |sl^4'Ghc fCount = 0 SqdI($F\: :z *jl'L 'Recurse directory and search for text files 7+IRI|d Dim f As String 'KT(;Vof f = Dir$(in_dir & "*.txt") "Nz@jv? While f <> "" ^zS;/% ReDim Preserve in_flist(fCount) A zp!;+ in_flist(fCount) = f zSu,S4m_; fCount += 1 *"4l}& f = Dir$() ~jmI`X/ Wend {E7STLQ_% ReDim Preserve in_flist(fCount-1) F%af05L[ x8~*+ j End Sub q_mxZM
->
|