RPC Photonics扩散片BSDF

o1lhVM`15   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

"`g5iUHqUl   摘要： 0"}qND   #0$fZ   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。 *ThP->&:(   /M!b3bmA   背景： y/i{6P2`,D   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。 StLFq6BO   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 PtsQV !   _Ns/#Xe/   USd7gOq(   \.ukZqB3 0   步骤 *).u:>D4   T,@s.v   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。 gZq_BY_U   图2. RPC Photonics工程漫射体不同类型的散射数据 CCDU5l$$   sE^ee2]OI@   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） "`Q&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 Yo%ph%e   例如下所示： <qGxkV   Sample name:  EDF-C1-56 56w uk [)   Merging data from file EDF-C1-56 0-0.txt FQTAkkA_!   Finished merging RPC data for sample EDF-C1-56 1A%0y)]   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt \!LIqqX   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 :'`y}'   a. 创建一个新的散射库 ?_ 476A   b. 散射模型命名 moS0y?N   c. 改变散射模型为“Tabulated BSDF”. 0\zY?UUww   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 ） sGFvSW   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。 S^s|/!>   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， 9$k0   g. 点击OK S5o,\wT   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 uM)#T* (   %lq[,6?>5   7+9o<j@@o   脚本代码： &R5zt]4d&   ONVhB   '#Language "WWB-COM" -wa" &Q   @eJ6UML"   Option Explicit }ChScY   p0rmcP1Ln   Sub Main ]f{3_M[   hT`fAn_       'Cleanup u i RO,B}z       ClearOutputWindow() s<>d&W 0=   \VpN:RI       Print "Merging RPC Photonics BSDF Data Files" EDT9O       SetTextColor(255,0,0) GXaPfC0-y       Print "Note: Script should be located in the same folder as the BSDF TXT files." hCBre5       Print "Note: Do not run this script multiple times without deleting the output file between executions." ?lE&ow       SetTextColor(0,0,0) \5|MW)x   3{)!T;Wd       'Current directory of this script (should be the same as the text files being merged) fUMjLA|*I<       Dim cDir As String !\VzX       cDir = MacroDir$ & "\" {p.^E5&   3n,jrX75u       'Array which will be populated with the list of files to be merged qv ^P       Dim fList() As String, curFile As String %oB0@&!mS       GetFileList( cDir, fList ) Q5c3C&$6   'ZJb`       Print "" <?nz>vz       Print "Files found for merging:" qjObu\r       For Each curFile In fList !YPwql(           Print Chr(9) & curFile H#i,Ve'       Next Z`_x|cU?J   <Drm#2x!E       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 0!-'4+"       Dim nameArray() As String, sampName As String qt (4?_J       nameArray = Split(fList(0)," 0-0.txt") = r4sF!g       sampName  = nameArray(0)  zo1T`"Y       Print "" #{*5rKiL       Print "Sample name: " & Chr(9) & sampName A9lw^.   ;A4qE W       'Open an output file and write the FRED header data ",l6-<s       Dim outFile As String {#st>%i       outFile = cDir & sampName & "_FRED.txt" -AD@wn!wCJ       Open outFile For Output As #1  svx7       Print #1, "type bsdf_data" ^k*%`iQ       Print #1, "format angles=deg bsdf=value scale=1" E[WU   ht*N[Pi4;       'Loop the file list, skip the two header lines and write the remaining data to file ftvu69f       Dim lineArray() As String, curLine As Long eL>wKu:r       For Each curFile In fList e^em^1H( %           Print "Merging data from file " & curFile X-tw)           ReadFile( cDir & curFile, lineArray ) vf zC2           For curLine = 2 To UBound(lineArray) Nyt*mbd5 {               Print #1, lineArray(curLine) L(bDk'zi           Next EnG h&]       Next ep~+]7\   d5NE:%K       'Close the output file [(2^oTSRaq       Close #1 X~UL$S;   o{>4PZ}=g       Print "Finished merging RPC data for sample " & sampName qdLzB       Print "FRED formatted data file: " & Chr(9) & outFile }W@refS   End Sub (a0(ZOKH   :2H]DDg(   'Utility function to read the contents of a file into an array of strings. ~;jgl_5?b   Function ReadFile(ByVal fileName As String, _ Auc&dpW                     ByRef lineArray() As String) As Long !KJA)znx;(   )u+O~Y95&i       ReadFile = -1 "f8,9@       Dim oFSO As Object Rz&`L8Bz       Set oFSO = CreateObject("Scripting.FileSystemObject") 3b\s;!       Erase lineArray sBYDo{01   \?oT.z5VG&       Dim fid As Long ysZ(*K n(?       If oFSO.fileexists( fileName ) Then $K+|bb           fid = FreeFile() wm^1Fn--           Open fileName For Input As fid VXiU5n^           lineArray = Split(Input(LOF(fid), fid), vbCrLf) c]Gs{V]\           Close fid T*mR9 8i       End If GZWqPM4S\       Set oFSO = Nothing `*[\b9>       Return UBound( lineArray ) )^BZ,e   0ETT@/)]z   End Function ?A;RTM   k-a1^K3   Sub GetFileList( ByVal in_dir As String, _ G6 2;p#                    ByRef in_flist() As String ) rHjDf[5+   Op8Gj `       'Redimension the file list array 6eUGE4NF(       Erase in_flist p2Gd6v.t   f[D%(       'Tracks how many files are found %E/#h8oN{       Dim fCount As Long &OZx!G^Z       fCount = 0 \pkK >R   GApvRR+Z       'Recurse directory and search for text files M"W#_wY;       Dim f As String 9od c :       f = Dir$(in_dir & "*.txt") BriL^]       While f <> "" W!T[ ^+           ReDim Preserve in_flist(fCount) )Nx*T9!Q           in_flist(fCount) = f ?*$uj(           fCount += 1 p>kny?AJ           f = Dir$() ViyG%Sm       Wend =$+0p3[r       ReDim Preserve in_flist(fCount-1)