zYYc#N/ 摘要: n_)d4d zl j?g{*M 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。 _yJd@ Q6RBZucv 背景: opjrU$<]N 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。 fwf]1@# 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。图1. RPC Photonics工程漫射体结构及光束投射形状 cDxjD5E :I+%v jv5p_v4%O -1:yqF.x 步骤 $a(wM1S4 ^B1Q";#
B^ 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。 Q^DKKp 图2. RPC Photonics工程漫射体不同类型的散射数据 K
{!eHTU i=o<\{iV: 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) o\g",O4- 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 $0AN5 |`g\ 例如下所示: 9%$4Ux*q Sample name: EDF-C1-56 y%cg Merging data from file EDF-C1-56 0-0.txt 9H" u\t|? Finished merging RPC data for sample EDF-C1-56 ds4ERe / FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 71@V|$Dy 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Yr,e7da a. 创建一个新的散射库 DKF`uRvGN: b. 散射模型命名 qI)
Yzc/ c. 改变散射模型为“Tabulated BSDF”. UKZsq5Q 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 ) wX<)Fj' 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。 -SlLX\>p 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, 8qrE<RHU@ g. 点击OK W.HM!HQp 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 2Af1-z^^K ](aXZ<, |jU/R 脚本代码: Wepa; ?Sh]m/WZd[ '#Language "WWB-COM" u0A.I_ a^@6hC>sr Option Explicit p4fU/ 2Vr F~+ Sub Main 8)\ ?6C /Pxt f~$ 'Cleanup KWLI7fTgj$ ClearOutputWindow() lN<vu# X) owj7U; Print "Merging RPC Photonics BSDF Data Files" NJI-8qTGI SetTextColor(255,0,0) ^}a..@|%W Print "Note: Script should be located in the same folder as the BSDF TXT files." BB.^-0up Print "Note: Do not run this script multiple times without deleting the output file between executions." fx_7X15 SetTextColor(0,0,0) kbN2dL Ww{bh-nyq 'Current directory of this script (should be the same as the text files being merged) 2!QJa= Dim cDir As String 7ykpDl^ @ cDir = MacroDir$ & "\" ,j:`yB]4, ^|5vmI'E 'Array which will be populated with the list of files to be merged [O2xE037h` Dim fList() As String, curFile As String ey _3ah3x GetFileList( cDir, fList ) rFh!&_ &u&/t? Print "" eBFsKOtu Print "Files found for merging:" +4Aj/$%[q For Each curFile In fList dzjp,c@ Print Chr(9) & curFile FMc$?mm Next ': 87.8$ 1aP3oXLL 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. D{x'k2= Dim nameArray() As String, sampName As String )>QpR8
G- nameArray = Split(fList(0)," 0-0.txt") Q(
U+o- sampName = nameArray(0) )[C]1N=tK Print "" 1Mn=m w Print "Sample name: " & Chr(9) & sampName jdiH9]&U b}HLuX 'Open an output file and write the FRED header data 3+ %a Dim outFile As String zR_ " outFile = cDir & sampName & "_FRED.txt" F{WV}o=MY Open outFile For Output As #1 dY5 m) ? Print #1, "type bsdf_data" M+j V`J! Print #1, "format angles=deg bsdf=value scale=1" w
&1_k:Z& sG7G$G*ta! 'Loop the file list, skip the two header lines and write the remaining data to file -GJ~xcf0 Dim lineArray() As String, curLine As Long K|%.mcs4 For Each curFile In fList s1.EE|h,5 Print "Merging data from file " & curFile
?12[8 ReadFile( cDir & curFile, lineArray ) K~$A2b95 For curLine = 2 To UBound(lineArray) w<#/ngI2 Print #1, lineArray(curLine) :[xFp}w{ Next $REz{xgA= Next $9YAq/#Q [1nfSW 'Close the output file
`fMdO Close #1 \NU^Jc_k7 (yA`h@@WS Print "Finished merging RPC data for sample " & sampName `yJ3"{uO Print "FRED formatted data file: " & Chr(9) & outFile 2n+tc End Sub Of0(.-Q w VUnO&zV{ 'Utility function to read the contents of a file into an array of strings. ]dIcW9a Function ReadFile(ByVal fileName As String, _ r&+8\/{ ByRef lineArray() As String) As Long (SGX|,5X7 i]x_W@h ReadFile = -1 3N c#6VI Dim oFSO As Object RT`.S
uN Set oFSO = CreateObject("Scripting.FileSystemObject") o]/*YaB2> Erase lineArray tf[)Q:| CGw, RNV Dim fid As Long 3MX&%_wUhB If oFSO.fileexists( fileName ) Then g?B4b7II fid = FreeFile() StLFq6BO Open fileName For Input As fid PtsQV! lineArray = Split(Input(LOF(fid), fid), vbCrLf) K Q^CiX Close fid =d`w~iC End If \.ukZqB3
0 Set oFSO = Nothing .ni<' Return UBound( lineArray ) M`V<` gZq_BY_U End Function tE'^O<
K BK 3oNDy Sub GetFileList( ByVal in_dir As String, _ jRiXN% ByRef in_flist() As String ) :.9Y e
|K_y~ 'Redimension the file list array +e^CL#Gs Erase in_flist Mz.C`Z>o <6Y|vEo!N 'Tracks how many files are found A9lw^. Dim fCount As Long ;A4qE W fCount = 0 mqHcD8X ?q7MbQw 'Recurse directory and search for text files xax[#Vl4 Dim f As String SwsJ<Dq^z f = Dir$(in_dir & "*.txt") ~s-bA#0S While f <> "" ht*N[Pi4; ReDim Preserve in_flist(fCount) ftvu69f
in_flist(fCount) = f eL>wKu:r fCount += 1 e^em^1H(
% f = Dir$() X- tw) Wend vf zC2 ReDim Preserve in_flist(fCount-1) |