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摘要: ])x1MmRg\ TOYK'|lwM 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。 !QUY ( Q=\
Oa(I 背景: T5BZD
+Ta 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。 ^S9y7b^;r 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。 l.[pnL D 图1. RPC Photonics工程漫射体结构及光束投射形状 ));#oQol9 x%P|T3Qy5 B[vj X"yg 步骤 da{]B5p\ g8),$:Uw 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 2EY"[xK| o9?@jjqH 图2. RPC Photonics工程漫射体不同类型的散射数据 KWwtL"3 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) -wlj;U 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 l?Y^3x}j 例如下所示: j)1y v. Sample name: EDF-C1-56 wN2+3LY{ Merging data from file EDF-C1-56 0-0.txt yoi4w 7: Finished merging RPC data for sample EDF-C1-56 N!A20Bv FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt .J#'k+> 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 R+sT
&d a. 创建一个新的散射库 r;cDYg b. 散射模型命名 0MQ= Rt c. 改变散射模型为“Tabulated BSDF”. &{iC:zp d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) fSh5u/F! e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 GnV0~? f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线,
idmU.` g. 点击OK 8WP>u8& 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 >&L|oq7$ yI w}n67 2`yhxO 脚本代码: O9gq <d BT{;^Hp '#Language "WWB-COM" ]`o5eByo ?-??>& z Option Explicit xQ?>72grP [)H 6`w Sub Main Z1Qz
LvWs 4"@<bKx 'Cleanup 4Nm >5*] ClearOutputWindow() fBO/0uW P{L=u74b{x Print "Merging RPC Photonics BSDF Data Files" Jx*cq;`Vee SetTextColor(255,0,0) Gk;YAI Print "Note: Script should be located in the same folder as the BSDF TXT files." ! VwU=5 Print "Note: Do not run this script multiple times without deleting the output file between executions." 5'lVh/ SetTextColor(0,0,0) S"Al[{ >DL 'Current directory of this script (should be the same as the text files being merged) :I"CQ
C[Z Dim cDir As String @xG&K{j cDir = MacroDir$ & "\" :}Jx =;Id["+ 'Array which will be populated with the list of files to be merged (1/Sf&2i Dim fList() As String, curFile As String M8^ID # GetFileList( cDir, fList ) ~{x1/eH #86N
!&x Print "" 6)HmE[[F Print "Files found for merging:" #J5BHY~ For Each curFile In fList 6fwNlC/9 Print Chr(9) & curFile 5zuwqOD* Next 8&QST!JGSX >Wg=
Tuef 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. *MJm: Dim nameArray() As String, sampName As String b#2)" V( nameArray = Split(fList(0)," 0-0.txt") g/?Vl2W sampName = nameArray(0) *4O=4F)x Print "" y@LI miRG Print "Sample name: " & Chr(9) & sampName 6#w>6g4V~R uH_KOiF 'Open an output file and write the FRED header data 0Q3U\cDr Dim outFile As String (qcFGM22U outFile = cDir & sampName & "_FRED.txt" GT>'|~e Open outFile For Output As #1 wG3L+[, Print #1, "type bsdf_data" F)P:lvp<r Print #1, "format angles=deg bsdf=value scale=1" i Ad&o`C 9#E *o~1 'Loop the file list, skip the two header lines and write the remaining data to file ,%i
Scr,z Dim lineArray() As String, curLine As Long YV>a 3 For Each curFile In fList UBo0c?,4 Print "Merging data from file " & curFile lH fZw})d ReadFile( cDir & curFile, lineArray ) +Z#=z,.^ For curLine = 2 To UBound(lineArray) VO#rJ1J Print #1, lineArray(curLine) *i#2>=) Next vE ]ge Next ;H$Cq'
I ;R$G.5h 'Close the output file " <bjS Close #1 h'ik3mLH +'H[4g` Print "Finished merging RPC data for sample " & sampName H4i}gdR Print "FRED formatted data file: " & Chr(9) & outFile =^"Sx??V End Sub Q0*E&;| g%2G=gR$?z 'Utility function to read the contents of a file into an array of strings.
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sY?C Function ReadFile(ByVal fileName As String, _ y"?`MzcJ0 ByRef lineArray() As String) As Long qxRsq&_ hV3]1E21" ReadFile = -1 32GI+NN Dim oFSO As Object %PW-E($o< Set oFSO = CreateObject("Scripting.FileSystemObject") mR}8} K]L
Erase lineArray b:1B
> [*%lm9 x Dim fid As Long T!
}G51 If oFSO.fileexists( fileName ) Then &-/J~b)" fid = FreeFile() / Pjd" Open fileName For Input As fid L1IF$eC lineArray = Split(Input(LOF(fid), fid), vbCrLf) "jZZ>\ Close fid Rsx6vF8]5 End If aru2H6 Set oFSO = Nothing _ep&`K Return UBound( lineArray ) [gzaOP`f Gm+D1l i End Function l@Lk+-[D @Y~gdK Sub GetFileList( ByVal in_dir As String, _ +:A `e+\ ByRef in_flist() As String ) AFt- V .M6. ]H 'Redimension the file list array pbzt8 P[ Erase in_flist G>~/ U<6)CW1; 'Tracks how many files are found LM<*VhX Dim fCount As Long .]9`eGVWj fCount = 0 EXdX%T\ 1@Ba7>%' 'Recurse directory and search for text files jLFaf#G] Dim f As String 8YSvBy f = Dir$(in_dir & "*.txt") NbWEP\dS'z While f <> "" AyJl:aN^ ReDim Preserve in_flist(fCount) |E13W in_flist(fCount) = f B"v*[p? fCount += 1 #jbC@A9Pe f = Dir$() /{R
^J# Wend e{6wFN ReDim Preserve in_flist(fCount-1) D(z#)oDr zBm~ J% End Sub CW;zviH5 ( w4XqVT <B%wq>4S QQ:2987619807 \]Y<d
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