RPC Photonics扩散片BSDF
摘要: pbl;n| 9]xOuCb 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。 LS?3 >1g )xoI H{ 背景: Pz:,q~ 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。 !Hr~B.f7 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。 dE%rQE7'
图1. RPC Photonics工程漫射体结构及光束投射形状 l _dWS9 W{*U#:Jx1 j[F\f> 步骤 `DUMTFcMX l*e*jA_>:7 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。 qm{(.b^ @_J~zo
图2. RPC Photonics工程漫射体不同类型的散射数据 &&nvv &a 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) :uSo2d 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 pW 2NrBq@w 例如下所示: U_K"JOZ Sample name: EDF-C1-56 9i;%(b{ Merging data from file EDF-C1-56 0-0.txt X6)-1.T& Finished merging RPC data for sample EDF-C1-56 W_Z%CBjcT FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^mv F%"g 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 '-N `u$3Y a. 创建一个新的散射库 w/IYQC\v b. 散射模型命名 g=XvqD< c. 改变散射模型为“Tabulated BSDF”. LPc)-t|p" d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) anxgD?<+B e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 >7V96jL$Y 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, iVu g. 点击OK - 0R5g3^*/ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 #^|y0:
%@k@tD6 %M]%[4eC 脚本代码: T~8= =Z{[ -GCC '#Language "WWB-COM" MHeUh[%( IW?).%F Option Explicit {p[{5k 0 Ti$G2dBO Sub Main BKvX,[R2 )CJXkzOX 'Cleanup n?!XNXb ClearOutputWindow() }E0~' `<2k.aW4e8 Print "Merging RPC Photonics BSDF Data Files" lqe|1vN SetTextColor(255,0,0) (0dy,GRN Print "Note: Script should be located in the same folder as the BSDF TXT files." +pXYBwH
7Q Print "Note: Do not run this script multiple times without deleting the output file between executions." X6)%2TwO SetTextColor(0,0,0) 3qujz)o cvxYuP~ 'Current directory of this script (should be the same as the text files being merged) 9:
N[9;(' Dim cDir As String Q6)Wh6Cm cDir = MacroDir$ & "\" `@TWZ%f6 [U]^:sV) 'Array which will be populated with the list of files to be merged "jV:L Dim fList() As String, curFile As String 7^)8DwAl GetFileList( cDir, fList ) S52'!WTq .8e]-^Z Print "" QOiPDu=8z Print "Files found for merging:" u_H=Xm)9 For Each curFile In fList KCP$i@Pjv Print Chr(9) & curFile A0X'|4I Next *U>"_h T0 jV{?.0/h| 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. PL} Wu= Dim nameArray() As String, sampName As String C2}n &{T nameArray = Split(fList(0)," 0-0.txt") 6$/Z.8 sampName = nameArray(0) 3E9 )~$ Print "" Hi%)TDfv Print "Sample name: " & Chr(9) & sampName dhrh "x_?: S:B$c> 'Open an output file and write the FRED header data ;QO3^P} Dim outFile As String 2_T2?weD5
outFile = cDir & sampName & "_FRED.txt" 8u8-:c%{ Open outFile For Output As #1 )R6h
1 Print #1, "type bsdf_data" abMB- Print #1, "format angles=deg bsdf=value scale=1" GdN9bA&, ]#k=VKdV 'Loop the file list, skip the two header lines and write the remaining data to file Z9wKjxu+ Dim lineArray() As String, curLine As Long f/xQy}4+~E For Each curFile In fList u00w'=pe) Print "Merging data from file " & curFile M>qqe! c* ReadFile( cDir & curFile, lineArray ) FEY_(70 For curLine = 2 To UBound(lineArray) B(|*u Print #1, lineArray(curLine) |7%has3" Next 5
w-Pq&q Next A1Ru&fd! 6v"WI@b4 'Close the output file + Vv+<M Close #1 [#@\A]LO f/7on|bv Print "Finished merging RPC data for sample " & sampName wqxChTbs Print "FRED formatted data file: " & Chr(9) & outFile YCl&}/.pA End Sub 1X5MknA 3vXa#f>P< 'Utility function to read the contents of a file into an array of strings. IA%|OVAfF Function ReadFile(ByVal fileName As String, _ -7Bg5{FA ByRef lineArray() As String) As Long ($nQmr;t 8Z|A'M ReadFile = -1 Y`N w E Dim oFSO As Object p40;@gUug Set oFSO = CreateObject("Scripting.FileSystemObject") 'VpzB
s# Erase lineArray *{:Zdg'~E tm1#Lh0 Dim fid As Long ;!S i_b2 If oFSO.fileexists( fileName ) Then E"%dO fid = FreeFile() 8n/8uRIR Open fileName For Input As fid ~6A;H$dr lineArray = Split(Input(LOF(fid), fid), vbCrLf) FuC#w 9_ Close fid %W}YtDf\ End If
F/SYmNp Set oFSO = Nothing 63E)RR_Lh Return UBound( lineArray ) Tw,|ZA4XH iE0x7x P_ End Function E-jJ!>&K T mK[^ Sub GetFileList( ByVal in_dir As String, _ Wr3z%1 ByRef in_flist() As String ) tWyl&,3?1 {uDH-b(R 'Redimension the file list array BZQ"[-V{ Erase in_flist }y1r
yeW< *Sg6VGP 'Tracks how many files are found /HH_Zi0?N| Dim fCount As Long DHg)]FQ/ fCount = 0 (gRTSd T? k4d;4D? 'Recurse directory and search for text files wP7
E8' Dim f As String aX,6y1 f = Dir$(in_dir & "*.txt") .sjv"D" While f <> "" 6d`qgEM3 ReDim Preserve in_flist(fCount) :d6]rOpX in_flist(fCount) = f `>4"i+NFF8 fCount += 1 wg+[T;0 S f = Dir$() qZdA% Wend XU<XK9EA ReDim Preserve in_flist(fCount-1) @Q7^caG \sAkKPI End Sub ]eUD3WUe>q ]z!Df\I bE,#, QQ:2987619807 F}.R-j#
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