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摘要: =}F$r5] zWF[cf>' RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 XNl!?*l5?l ? 8S~R 背景: 1t#|MH
?U_ Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 >kDkv g1" FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 0!1cHB/c 图1. RPC Photonics工程漫射体结构及光束投射形状 7q#R,\ KM-7w66V zogl2e+ 步骤
'^,|8A2 -TNb=2en( 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 l?x'R("{ l<s6Uu" 图2. RPC Photonics工程漫射体不同类型的散射数据 [*Vo`WgbD 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) j3/K;U/SGJ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 !XF:.| 例如下所示: ?T'a{~]R Sample name: EDF-C1-56 R^JtWjJR Merging data from file EDF-C1-56 0-0.txt GVM)-Dp] Finished merging RPC data for sample EDF-C1-56 z3yAb"1Hg FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt !L@a;L 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 H4ancmy a. 创建一个新的散射库 3lefB
A7 b. 散射模型命名 G"*ch$: c. 改变散射模型为“Tabulated BSDF”. -Vjrh/@ 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,#o!> 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。 XILreATK@ 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, K5\;'.9M g. 点击OK 7KV0g1GQ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 7qhX`$ @t3I}mc hoZM;wC 脚本代码: c7 O$< F <+p{U( '#Language "WWB-COM" a]?o"{{+ qW9~S0sl Option Explicit KhNOxMZ e>b|13X Sub Main F{
sPQf' Iv>4o~t 'Cleanup @kB^~Wf ClearOutputWindow() vC-5_pl <USr$ Print "Merging RPC Photonics BSDF Data Files" T^
RYN SetTextColor(255,0,0) Z!oq2,ia Print "Note: Script should be located in the same folder as the BSDF TXT files." G@1T!` Print "Note: Do not run this script multiple times without deleting the output file between executions." ]4)$dQ59 SetTextColor(0,0,0) kaNK@a=e|/ ac/<N% 'Current directory of this script (should be the same as the text files being merged) 4cJka~ Dim cDir As String <U2Un 0T cDir = MacroDir$ & "\" /"7_75
t !mu1e=bY> 'Array which will be populated with the list of files to be merged w72\' Dim fList() As String, curFile As String ^:^8M4: GetFileList( cDir, fList ) #PA 9bM U
oG+du[ Print "" >VB*Xt\C& Print "Files found for merging:" UO_tJN#X For Each curFile In fList n~?n+\.&a Print Chr(9) & curFile ~)]R Next &&`-A6`p o@DlK` 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. v|; }}ol Dim nameArray() As String, sampName As String "uG@gV nameArray = Split(fList(0)," 0-0.txt") *.A{p ;JC( sampName = nameArray(0) !)LVZfQ0 Print "" 'zfj`aqc Print "Sample name: " & Chr(9) & sampName E6s)J -a 5HW'nhE 'Open an output file and write the FRED header data j@Y'>3 Dim outFile As String h7o?z! outFile = cDir & sampName & "_FRED.txt" nlR7V. Open outFile For Output As #1 ,2Q5'!o Print #1, "type bsdf_data" ;.&k zzvJ Print #1, "format angles=deg bsdf=value scale=1" EOzw&M];r 6"u"B-cz 'Loop the file list, skip the two header lines and write the remaining data to file .dTXC' Dim lineArray() As String, curLine As Long |,WP) For Each curFile In fList 0E/,l``p Print "Merging data from file " & curFile +`'> ReadFile( cDir & curFile, lineArray ) R9)"%SO<y For curLine = 2 To UBound(lineArray) i
3i Print #1, lineArray(curLine) zF#:Uc`C5U Next 2rG$.cGN" Next tIL ]JB ]r(s02 'Close the output file &W$s-qf". Close #1 .[C@p`DZ y5`$Aa4~ Print "Finished merging RPC data for sample " & sampName )5/,B-+O" Print "FRED formatted data file: " & Chr(9) & outFile ,HtXD~N End Sub xpB*>zb 4s7&*dJ 'Utility function to read the contents of a file into an array of strings. _j}jh[M
Function ReadFile(ByVal fileName As String, _ U\x$@J ByRef lineArray() As String) As Long 91ndr@*| ,V.Bzf%=O ReadFile = -1 {&0u:
Dim oFSO As Object W|AK"vf Set oFSO = CreateObject("Scripting.FileSystemObject") *`~]XM@H Erase lineArray eizni\ s|9[=JMG Dim fid As Long NM0s*s42 If oFSO.fileexists( fileName ) Then ANq3r( fid = FreeFile() IT:8k5(L5j Open fileName For Input As fid kKz>]t"A lineArray = Split(Input(LOF(fid), fid), vbCrLf) r74'
_y Close fid Fb\ E39 End If J)._&O$ Set oFSO = Nothing b&2N7% Return UBound( lineArray ) kB-]SD# 1}ws@hU End Function 57[tUO s|!lw Sub GetFileList( ByVal in_dir As String, _ A#8J6xcSrL ByRef in_flist() As String ) T*jQzcm~? i>%A0.9 'Redimension the file list array yz^4TqJ Erase in_flist tx ,q=.( AfvIzsT0 'Tracks how many files are found
AS/z1M_U Dim fCount As Long %Z+FX,AK fCount = 0 DLD 5> N<^)tR8+ 'Recurse directory and search for text files &.[I}KH|B Dim f As String =2e{T J/ f = Dir$(in_dir & "*.txt") <ZjT4>< While f <> "" =hi{J
M ReDim Preserve in_flist(fCount) =buarxk in_flist(fCount) = f ;.Y-e
Q, fCount += 1 r -$VPW f = Dir$() =B0AG9Fz Wend uP$C2glyz ReDim Preserve in_flist(fCount-1) d9q`IZqee g9@H4y6fe= End Sub :pvB}RYD ;$'D13 &X#6jTh+ QQ:2987619807 00/ RBs5
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