RPC Photonics扩散片BSDF

q, 8TOn   RPC Photonics扩散片BSDF

时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印

JjXuy7XQ   摘要： %a_ rYrL   8%@![$q<g   RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 j>{Dbl:#2   Hz*5ZIw   背景： _XO3ml\x@   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 _{]\} =@   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 S[2uez`   2~*J<iO&l   kgq"b)   pn:) Rq0   步骤 6cF~8   *[P"2b#   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 bc?\lD$$   图2. RPC Photonics工程漫射体不同类型的散射数据 y&-1SP<   W7F1o[   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） hnk,U: 7}   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 4P406,T]r   例如下所示： V>$A\AWw   Sample name:  EDF-C1-56 /e2CB"c   Merging data from file EDF-C1-56 0-0.txt vDeb?n   Finished merging RPC data for sample EDF-C1-56 MsaD@JY.y   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt fAMk<?   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 o#D;H[' A   a. 创建一个新的散射库 _|'e Az    b. 散射模型命名 8(6(,WwP}   c. 改变散射模型为“Tabulated BSDF”. B"@3Qav3   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） )g()b"Z #>   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 Yq$KYB j   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， isG8S(}IW&   g. 点击OK ]#7{x   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 !T'`L{Sj   ^5MPK@)c,/   \6{w#HsP8   脚本代码： D?Mj<||   l"{1v~I   '#Language "WWB-COM" 17 k9h?s*   j $<sq   Option Explicit 2`Ojw_$W7   k%|Sl>{Ir   Sub Main 1(q&(p   ef Moi'v       'Cleanup @(m+B\       ClearOutputWindow() `X:o]t@   K&\ q6bU       Print "Merging RPC Photonics BSDF Data Files" $+ P6R`K       SetTextColor(255,0,0) (uxe<'Co|       Print "Note: Script should be located in the same folder as the BSDF TXT files." ]gw[ ~       Print "Note: Do not run this script multiple times without deleting the output file between executions." At0ahy+       SetTextColor(0,0,0) \ [>Ob   y^*o%2/       'Current directory of this script (should be the same as the text files being merged) -l b,0        Dim cDir As String \~r`2p-K       cDir = MacroDir$ & "\" mw\ z'   d : a*;F       'Array which will be populated with the list of files to be merged L/[b~D>T%       Dim fList() As String, curFile As String YUGEGXw       GetFileList( cDir, fList ) Sb/`a~q^   !jySID?q       Print "" =^9I)JW       Print "Files found for merging:" js$L<^7       For Each curFile In fList ~OE1Sd:2           Print Chr(9) & curFile S.I3m-       Next -PG81F&K   vOIzfwYG9       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement.  Fhk 8       Dim nameArray() As String, sampName As String VqIzDs       nameArray = Split(fList(0)," 0-0.txt") \C&[BQ\       sampName  = nameArray(0) U G!528;7       Print "" 7eR%zNDa       Print "Sample name: " & Chr(9) & sampName eXYf"hU,   l!d |luqbA       'Open an output file and write the FRED header data !lnRl8oV       Dim outFile As String vg"$&YX9"       outFile = cDir & sampName & "_FRED.txt" -r'/PbV0       Open outFile For Output As #1 z{q |HO       Print #1, "type bsdf_data" Fmd^9K       Print #1, "format angles=deg bsdf=value scale=1" 4pJ #fk c^   I&Z4?K       'Loop the file list, skip the two header lines and write the remaining data to file [wO|P{8\"       Dim lineArray() As String, curLine As Long Bw{enf$vR       For Each curFile In fList YjR`}rdwo           Print "Merging data from file " & curFile 6z'3e\x           ReadFile( cDir & curFile, lineArray ) :,@\q0j"=           For curLine = 2 To UBound(lineArray) c{,VU.5/               Print #1, lineArray(curLine) Po1/_#mu           Next eJvNUBDSH       Next %`# HGji)   l} =@9A@       'Close the output file '| 6ZPv&N       Close #1 d$gT,+|vu   +@"Ls P       Print "Finished merging RPC data for sample " & sampName (X3}&aLF       Print "FRED formatted data file: " & Chr(9) & outFile F*, e,s   End Sub L>>RboR}   N+9W2n   'Utility function to read the contents of a file into an array of strings. O!U8"Yr$   Function ReadFile(ByVal fileName As String, _ ea3f`z                     ByRef lineArray() As String) As Long *I6W6y;E=   !LX)       ReadFile = -1 t8?$q})RL       Dim oFSO As Object A0l-H/ l7       Set oFSO = CreateObject("Scripting.FileSystemObject") q(9S4F        Erase lineArray Q&@e,7]V+   [a[.tR38e       Dim fid As Long ?lPyapA]       If oFSO.fileexists( fileName ) Then B'D\l\w           fid = FreeFile() _wp_y-"           Open fileName For Input As fid @km@\w           lineArray = Split(Input(LOF(fid), fid), vbCrLf) +}eH,           Close fid &~K4I       End If NW4tQ;ad       Set oFSO = Nothing %Ek!3t       Return UBound( lineArray ) =MjkD)l   Rh,a4n?W   End Function *Tum(wWZ   AeR*79x   Sub GetFileList( ByVal in_dir As String, _ o FS2*u                    ByRef in_flist() As String ) nXT/zfS   &~KAZ}xu       'Redimension the file list array eq6>C7.$       Erase in_flist E'cI}q   I R|[&}z       'Tracks how many files are found A:4?Jd>       Dim fCount As Long 0CpE,gg       fCount = 0 k~XDwmt;   BS|$-i5L       'Recurse directory and search for text files '',g}WvRwe       Dim f As String EpCF/i?9:       f = Dir$(in_dir & "*.txt") 3]li3B'       While f <> "" eqSCE6r9x           ReDim Preserve in_flist(fCount) HJ+Q7)           in_flist(fCount) = f ;wa#m1           fCount += 1 CxD=8X9m           f = Dir$() H{4_,2h=m       Wend ;Xl {m`E+       ReDim Preserve in_flist(fCount-1)