RPC Photonics扩散片BSDF
摘要: 6#2E {uy;R ~=Fp0l)# 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。 +Jq~39 69``j{Z+ 背景: t)l^$j!h@ Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 "A}2iI FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ]~'pYOB
图1. RPC Photonics工程漫射体结构及光束投射形状 ]Mgxv>zRbs J~5+=V7OV aw1f;&K4 步骤 /|[%~`?BM 4AN(4"$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。 +?C7(-U> Z+S1e~~
图2. RPC Photonics工程漫射体不同类型的散射数据 $"{I|UFC 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) #Gu(h(Z s 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 FzQ6UO~' 例如下所示: ;#dzw!+Y Sample name: EDF-C1-56 ~qb-uT\(99 Merging data from file EDF-C1-56 0-0.txt @?[}\9dW Finished merging RPC data for sample EDF-C1-56 esHcE{GNOS FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt (fC U+ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 NYF
7Ep; _ a. 创建一个新的散射库 (L7%V ! b. 散射模型命名 qyY]:
(8 c. 改变散射模型为“Tabulated BSDF”. 6w$pL( d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) -T .C?Q g e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 #j6qq3OG f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, pm'i4!mY<P g. 点击OK h8? E+0 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 0"xD>ue& ?lQ-HO Aw s!j vBy 脚本代码: hkvymHaG aumM\rY '#Language "WWB-COM" 1H7bPl| "I^pb.3 Option Explicit 'FmnlC1 >I*uo.OF Sub Main FK`M+ j ?8@EBPpC 'Cleanup !l#n.Fx&3 ClearOutputWindow() 5,K*IH 5?C) v}w+ Print "Merging RPC Photonics BSDF Data Files" U
jB5Xks SetTextColor(255,0,0) tLe"i> Print "Note: Script should be located in the same folder as the BSDF TXT files." #P-T4R Print "Note: Do not run this script multiple times without deleting the output file between executions." j<_)Y(x> SetTextColor(0,0,0) T Ue=Yj vS+E`[ 'Current directory of this script (should be the same as the text files being merged) s%S; 9T Dim cDir As String {t QZqqdn@ cDir = MacroDir$ & "\" {&s.* 5 `ouCQ]tKz 'Array which will be populated with the list of files to be merged }#QYZ nR Dim fList() As String, curFile As String _6{XqvWqb GetFileList( cDir, fList ) }1pG0V4 Tq!.M1{& Print "" dpI! {'"M Print "Files found for merging:" ,L9ioYbp For Each curFile In fList ~ YCZvJ Print Chr(9) & curFile Vh5Z'4N Next s
N|7 "*0h=x$ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. /WJ+e Dim nameArray() As String, sampName As String A&($X)t nameArray = Split(fList(0)," 0-0.txt") #tQ__V sampName = nameArray(0) 5Ak6 q(\ Print "" '"o&BmF Print "Sample name: " & Chr(9) & sampName Dro2R_j{ =@0/.oSD 'Open an output file and write the FRED header data W>(p4m Dim outFile As String 8+OcM
;0 outFile = cDir & sampName & "_FRED.txt" <B3$ODGJp Open outFile For Output As #1 /;a b"b Print #1, "type bsdf_data" \N"=qw^ t Print #1, "format angles=deg bsdf=value scale=1" B0eKj=y; ~xV|<; 'Loop the file list, skip the two header lines and write the remaining data to file n6s[q-td Dim lineArray() As String, curLine As Long !w=6>B^ For Each curFile In fList Z^SF $+UN Print "Merging data from file " & curFile kxVR#: ReadFile( cDir & curFile, lineArray ) =P\Tk)(` For curLine = 2 To UBound(lineArray) ;Zow C#j Print #1, lineArray(curLine) $mq@g Next ?wYvBFRn7" Next a>XlkkX c6Z\ecH9 'Close the output file fPu,@
L
Close #1 "fX9bh^ 4J6,_8`U Print "Finished merging RPC data for sample " & sampName %q)*8 Print "FRED formatted data file: " & Chr(9) & outFile w*7BiZ{s< End Sub :bV1M5 25CO_ 'Utility function to read the contents of a file into an array of strings. =[T_`*s& Function ReadFile(ByVal fileName As String, _ Xj(" ByRef lineArray() As String) As Long b Q6<R4 t
(>} ReadFile = -1 [W{WfJ-HwG Dim oFSO As Object 9 9S-P}xd Set oFSO = CreateObject("Scripting.FileSystemObject") nFY6K%[ Erase lineArray `oUuAL /!L#cUog Dim fid As Long ?,0 5!] If oFSO.fileexists( fileName ) Then qe"t0w|U? fid = FreeFile() &]mZp& Open fileName For Input As fid 3iC$ "9!p lineArray = Split(Input(LOF(fid), fid), vbCrLf) _yJAn\ Close fid %qj8*1 End If WC<K(PP Set oFSO = Nothing fF*{\ Return UBound( lineArray ) N!
N>/9 mFdj+ &2\ End Function ~KF>Jow?Y .uGvmD<;x Sub GetFileList( ByVal in_dir As String, _ Q4vl ByRef in_flist() As String ) zPKx: I3 Q7vTTn\ 'Redimension the file list array ++)3*+N+
Erase in_flist q!+&|F ?6=u[))M& 'Tracks how many files are found
{j{H@rHuy Dim fCount As Long =Pu;wx9 fCount = 0 'ixu+.ZL/ G$)f5_]7{ 'Recurse directory and search for text files 6*]g~)7`Q~ Dim f As String h
&R1" f = Dir$(in_dir & "*.txt") [hl8LP+~ While f <> "" wQV[ZfU^h ReDim Preserve in_flist(fCount) 1!4-M$- in_flist(fCount) = f
l,n
V*Z fCount += 1 1ae,s{| f = Dir$() y$7vJl.uS/ Wend 5!pof\/a ReDim Preserve in_flist(fCount-1) l#;DO9 }KZt7) End Sub ,4&?`Q v==b.
2= d@ ?++z QQ:2987619807 V{yP/X
|