RPC Photonics扩散片BSDF

2+s_*zM-   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

UwvGw5)q   摘要： " 2Dz5L1v   q?nXhUD   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。 SsIy;l   {Uz@`QO3   背景： >8"oO[U5>   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。 C\ZL*,%}   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 GLp2 ?fon   ryB^$Kh,,   o8-BTq8   r/$+'~apTk   步骤 9TIyY`2!   6iVjAxR   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。 J}c57$Z   图2. RPC Photonics工程漫射体不同类型的散射数据 1XSA3;ZEc   9z$]hl   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） IEfzu L<v   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 CC0@RU   例如下所示： `MAee8u'   Sample name:  EDF-C1-56 w},' 1   Merging data from file EDF-C1-56 0-0.txt ig4wwd@|   Finished merging RPC data for sample EDF-C1-56 KkP}z   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt u_;*Ay   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Sf);j0G,D   a. 创建一个新的散射库 jL(=<R(~y   b. 散射模型命名 |NJe4lw+?   c. 改变散射模型为“Tabulated BSDF”. SpPG   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 ） >@KQ )p' `   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。 *Z>Yv37P   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， ]( V+ qj   g. 点击OK H%t/-'U?   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 e^&QT    |R8=yO%(   D9zw' RY   脚本代码： ! E`Tt[   x%23oPM   '#Language "WWB-COM" Fq!12/Nn   l+Dl~o}   Option Explicit a*REx_gLG   MlgE-Lm   Sub Main BF@(`D&>   2.ud P       'Cleanup (Z"QHfO'       ClearOutputWindow() f{xR s-u]   ?BT\)@h       Print "Merging RPC Photonics BSDF Data Files" 5!$m3j_,]?       SetTextColor(255,0,0) /+l3 BeL       Print "Note: Script should be located in the same folder as the BSDF TXT files." pJrc\`D       Print "Note: Do not run this script multiple times without deleting the output file between executions." _QbLg"O       SetTextColor(0,0,0) ; Xrx>( n   3G9"La,b       'Current directory of this script (should be the same as the text files being merged) |:$D[=       Dim cDir As String vpcHJ^19       cDir = MacroDir$ & "\" cTu7U=%   #DApdD9M       'Array which will be populated with the list of files to be merged -ZFeE[Z       Dim fList() As String, curFile As String gYVk5d|8@4       GetFileList( cDir, fList ) cN0|! nm*   9w'3d@       Print "" ;j])h!8X       Print "Files found for merging:" ZHUAM59bx       For Each curFile In fList 4d4le           Print Chr(9) & curFile Rn~FCj,-       Next Qmle0ae   RBIf6oxdE       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. J\<7M8       Dim nameArray() As String, sampName As String -FytkM^]6       nameArray = Split(fList(0)," 0-0.txt") ^'.=&@i-       sampName  = nameArray(0) \?c0XD       Print "" ?jbE3fW       Print "Sample name: " & Chr(9) & sampName n)uvN   3p{N7/z(       'Open an output file and write the FRED header data 6NH.!}"G9       Dim outFile As String <9 lZ%j;       outFile = cDir & sampName & "_FRED.txt" 5%"$ {ywI       Open outFile For Output As #1 -NtT@ +AE       Print #1, "type bsdf_data" LuY`mi       Print #1, "format angles=deg bsdf=value scale=1" s,m+q)   biG=4?Xl       'Loop the file list, skip the two header lines and write the remaining data to file s|rlpd4y       Dim lineArray() As String, curLine As Long e`zEsLs@       For Each curFile In fList TJ[C,ic=D           Print "Merging data from file " & curFile D.Rk{0se8           ReadFile( cDir & curFile, lineArray ) vK6YU9W~J           For curLine = 2 To UBound(lineArray) >Z?fX               Print #1, lineArray(curLine) 4@OnMj{M           Next c[E{9wp v       Next RR!(,j^M   y , isK       'Close the output file J_YbeZ]       Close #1 }[}u5T`w>   0#4_vg .       Print "Finished merging RPC data for sample " & sampName GdG1e%y]z       Print "FRED formatted data file: " & Chr(9) & outFile w]GoeIg({   End Sub (rO_Vfaa   1}#v<b$   'Utility function to read the contents of a file into an array of strings. Be}e%Rk   Function ReadFile(ByVal fileName As String, _ E]w1!Ah M                     ByRef lineArray() As String) As Long GY<E rS)2   ~ ui/Qf2|       ReadFile = -1 i$;GEM}tv       Dim oFSO As Object rHPda?&H       Set oFSO = CreateObject("Scripting.FileSystemObject") W)JUMW2|       Erase lineArray pw{3I 2Ix   T:o!H Xdj^       Dim fid As Long <q hNX$t       If oFSO.fileexists( fileName ) Then 8(3'YNC           fid = FreeFile() ]#R'hL%f           Open fileName For Input As fid \eF5* {9           lineArray = Split(Input(LOF(fid), fid), vbCrLf) (UDF^           Close fid 44FK%TmtF       End If NCYN .@J       Set oFSO = Nothing %F-/|x1#Q       Return UBound( lineArray ) I7TdBe-   kRs[H xI3   End Function *zeY<6   wGa0w*$   Sub GetFileList( ByVal in_dir As String, _ }MP2)6                    ByRef in_flist() As String ) 1)(p=<$   9UTWq7KJ       'Redimension the file list array P`6 T;|VDk       Erase in_flist @QI]P{   y_J~n 9R       'Tracks how many files are found o^dt# &       Dim fCount As Long vR`-iRQ?_       fCount = 0 *}R5=r0   ;e;lPM{+       'Recurse directory and search for text files nR4L4tdS       Dim f As String XSt5s06TM       f = Dir$(in_dir & "*.txt") ya5a7       While f <> "" vb/ *ILS           ReDim Preserve in_flist(fCount) '7o 'u]           in_flist(fCount) = f hu~02v5           fCount += 1 F7a &-           f = Dir$() |57KTiiNLI       Wend zk5sAHQ       ReDim Preserve in_flist(fCount-1)