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摘要: KvEv0L<ky xr]bH.> 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。 *4NY"EwjN 0ju-l=w 背景: n6.Z{Q'b 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。 !=PH5jTY 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。 o $W@@aM 图1. RPC Photonics工程漫射体结构及光束投射形状 z-b78A/8 h@\-]zN{ [Z"Z5e` 步骤 &M<"Fmn 88,hza`#V 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 3<"j/9;K' "igA^^?X1N 图2. RPC Photonics工程漫射体不同类型的散射数据 w8R7Ksn( 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ZS4dW_*[ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集
{U$XHG 例如下所示: =0]K(p, Sample name: EDF-C1-56 bGL} nPo Merging data from file EDF-C1-56 0-0.txt |LZ{kD| Finished merging RPC data for sample EDF-C1-56 dsx<ZwZN> FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt cW_wIy\]& 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 mRRZ/m?A( a. 创建一个新的散射库 F-rhxJd b. 散射模型命名 %K')_NS@ c. 改变散射模型为“Tabulated BSDF”. D
(8Z90 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 ) K>e-IxA);0 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。 ,b - 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, }BU%<5CQ g. 点击OK )Z1&`rv 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值
m (MQ !reOYt| _s#]WyU1g 脚本代码: p+|8(w9A${ YVa,?&i=N '#Language "WWB-COM" JygJ4RI%j \wsVO"/ Option Explicit 5I1YB+$}e } % Ie Sub Main ]r3/hDRDL@ }xt^}:D 'Cleanup )1B?<4 ClearOutputWindow() %LP4RZ 6q8}8;STTY Print "Merging RPC Photonics BSDF Data Files" &z40l['4bz SetTextColor(255,0,0) .=Oww Print "Note: Script should be located in the same folder as the BSDF TXT files." Z8FgxR Print "Note: Do not run this script multiple times without deleting the output file between executions." Nv. SetTextColor(0,0,0) P ?f${t+ :%J;[bS+ 'Current directory of this script (should be the same as the text files being merged) ;YY<KuT Dim cDir As String i6k6l% cDir = MacroDir$ & "\" 8Cp@k= 95~bM;TVr 'Array which will be populated with the list of files to be merged #J3o~,t< Dim fList() As String, curFile As String VnkhY GetFileList( cDir, fList ) }:c~5whN qMVuFwPhi Print "" 7r'_p$ Print "Files found for merging:" G^nG^HTo5 For Each curFile In fList "*D9.LyM Print Chr(9) & curFile u8KQV7E Next n/(}|xYU 48^C+#Jbc 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 4GF3.?3 Dim nameArray() As String, sampName As String D!Y@Og. nameArray = Split(fList(0)," 0-0.txt") \3^V-/SJf sampName = nameArray(0) i&lW&] Print "" +@!\3a4! Print "Sample name: " & Chr(9) & sampName y7:f^4 P HOngn 'Open an output file and write the FRED header data y*X.DS 1(w Dim outFile As String EG qu-WBS outFile = cDir & sampName & "_FRED.txt" 2bTS,N/> Open outFile For Output As #1 $`W3`}#fM Print #1, "type bsdf_data" Y%
\3 N Print #1, "format angles=deg bsdf=value scale=1" H!7?#tRU PVF:p7 'Loop the file list, skip the two header lines and write the remaining data to file ZT*}KJm Dim lineArray() As String, curLine As Long }JST(d& For Each curFile In fList CKZEX*mPC Print "Merging data from file " & curFile ~ !mY0odH ReadFile( cDir & curFile, lineArray ) j0+D99{R For curLine = 2 To UBound(lineArray) \8<[P(!3 Print #1, lineArray(curLine) OAs>F" Next "IQYy~
/ Next u;H^4}
OQ =>c0NT 'Close the output file (nmsw6
X Close #1 E_A5KLP aWRi`poZT Print "Finished merging RPC data for sample " & sampName ]!sCWR Print "FRED formatted data file: " & Chr(9) & outFile r`<e<C End Sub ^.)0O3oC +,YK}?e 'Utility function to read the contents of a file into an array of strings. bws}'#-* Function ReadFile(ByVal fileName As String, _ QeFt
WjlqC ByRef lineArray() As String) As Long h>*3i# ,N,@9p ReadFile = -1 \F`>zY2$% Dim oFSO As Object |pBFmm* Set oFSO = CreateObject("Scripting.FileSystemObject") r vq{Dfo= Erase lineArray m%})H"5 m?yztm~u Dim fid As Long HxW/t7Z( If oFSO.fileexists( fileName ) Then P3W3+pwq fid = FreeFile() YI*H]V%w Open fileName For Input As fid @<$m`^H lineArray = Split(Input(LOF(fid), fid), vbCrLf) G)NqIur*Z Close fid >6&Rytcc] End If k)D5>T Set oFSO = Nothing r*mSnPz\q Return UBound( lineArray ) #W/Ch"Kv I>l^lv&[+ End Function ~"\v(\P e @|"K"j# Sub GetFileList( ByVal in_dir As String, _ LqI&1$# ByRef in_flist() As String ) DVwB}W~ Z?qLn6y1W 'Redimension the file list array 0Cf'\2
Erase in_flist JBHPI@Qt% -wx~* 'Tracks how many files are found E>-I
|X"L1 Dim fCount As Long p ]jLs|tat fCount = 0 .
4RU'9M ^fO9oPM| 'Recurse directory and search for text files j~.tyxOq# Dim f As String o-&0_Zq_ f = Dir$(in_dir & "*.txt") 0/|Ax-dK While f <> "" f$5pp=s: n ReDim Preserve in_flist(fCount) 2{BS `f in_flist(fCount) = f VuTTWBx fCount += 1 98
NFJ f = Dir$() ]G8"\J4 & Wend jHE^d<=O^ ReDim Preserve in_flist(fCount-1) AZik:C"Q ~&<vAgy, End Sub t OJyj49^a bFL2NH5 0Ba]Zo Z QQ:2987619807 N8kNi4$mp=
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