RPC Photonics扩散片BSDF

3{)!T;Wd   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

iGPrWe@.   摘要： {p.^E5&   4#qZ`H,Ur)   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。 e%s1D   ZIN1y;dJ   背景： /!?b&N/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。 EXMW,   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 > ^=n|%   !YPwql(   IaZmN.k*   Z`_x|cU?J   步骤 <Drm#2x!E   ku4Gc6f#gG   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。 i?ZVVE=r   图2. RPC Photonics工程漫射体不同类型的散射数据 5vFM0   IL go:xQ   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） f&j\gYWq   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 D6~KLSKm   例如下所示： }uNj#Uf   Sample name:  EDF-C1-56 denxcDFu/~   Merging data from file EDF-C1-56 0-0.txt o}DRp4;Ka   Finished merging RPC data for sample EDF-C1-56 mPU}]1*p   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt n}b{u@$   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ic5af"/(\   a. 创建一个新的散射库 3?K+wg s   b. 散射模型命名 uH?dy55Y   c. 改变散射模型为“Tabulated BSDF”. ,hH c -%-   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 ） N5{v;~Cm}V   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。 j!@T@ 8J   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， ny{S&f   g. 点击OK -RJ~Sky[   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 >?1GJ5]\s   [;yKbw!C   F!3p )?   脚本代码： ~5&B#Sm[G   &#JYh=#   '#Language "WWB-COM" L[ZS17;*   X{Fr   Option Explicit ~n8UN<   c(uDkX   Sub Main je@&|9h   >yr;Y4y7K       'Cleanup >|, <9z`D       ClearOutputWindow() oKYa?   ?%`Ph ?BZl       Print "Merging RPC Photonics BSDF Data Files" <o9AjASv\,       SetTextColor(255,0,0) [ :) F-       Print "Note: Script should be located in the same folder as the BSDF TXT files." ~r?tFE*+       Print "Note: Do not run this script multiple times without deleting the output file between executions." bfpeK>T       SetTextColor(0,0,0) kQe<a1 8   g4=C]\1       'Current directory of this script (should be the same as the text files being merged) @D=B5f@(o       Dim cDir As String w+"E{#N       cDir = MacroDir$ & "\" G k+R,:   sVr|kvn2       'Array which will be populated with the list of files to be merged z{&Av       Dim fList() As String, curFile As String SHs [te[       GetFileList( cDir, fList ) OwEV$Q   iZ>P>x\       Print "" n-2!<`UFX       Print "Files found for merging:" DLP@?]BBOA       For Each curFile In fList akk*f+TD`           Print Chr(9) & curFile Vpp$yM&?       Next W4$aX5ow$   4i.&geXA.       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 45n.%*,       Dim nameArray() As String, sampName As String za}Kd^KeB       nameArray = Split(fList(0)," 0-0.txt") ZnJJ-zP       sampName  = nameArray(0) -<k)|]8       Print "" H>D sAHS       Print "Sample name: " & Chr(9) & sampName 34X]b[^   R<_VWPlj       'Open an output file and write the FRED header data t\LE\[XM>       Dim outFile As String [L7s(Zs>       outFile = cDir & sampName & "_FRED.txt" QVRQUd       Open outFile For Output As #1 W!T[ ^+       Print #1, "type bsdf_data" )Nx*T9!Q       Print #1, "format angles=deg bsdf=value scale=1" "!(@MfjT   p>kny?AJ       'Loop the file list, skip the two header lines and write the remaining data to file ViyG%Sm       Dim lineArray() As String, curLine As Long =$+0p3[r       For Each curFile In fList "9dZ z/{           Print "Merging data from file " & curFile ;hODzfNkS           ReadFile( cDir & curFile, lineArray ) y`8U0TE3R           For curLine = 2 To UBound(lineArray) *z6A ~U               Print #1, lineArray(curLine) $[b}r#P           Next QHja4/       Next L~e0^X ?   n7B2rRJH       'Close the output file )7!,_r       Close #1 !~RK2d   *~4<CP+"0       Print "Finished merging RPC data for sample " & sampName c%O97J.5b       Print "FRED formatted data file: " & Chr(9) & outFile @YRy)+   End Sub 5D=U.UdR   J"< h#@`   'Utility function to read the contents of a file into an array of strings. k%u fgHl!   Function ReadFile(ByVal fileName As String, _ uH?4d!G                     ByRef lineArray() As String) As Long ctHQZ#.[(   L4T\mP7D7*       ReadFile = -1 = 03G~7B>       Dim oFSO As Object 1u5^a^O(|       Set oFSO = CreateObject("Scripting.FileSystemObject") nC !NZ       Erase lineArray 7p\&D?   %scIZCrI~       Dim fid As Long ]l h=ZC       If oFSO.fileexists( fileName ) Then qc.TYp           fid = FreeFile() rQNm2h           Open fileName For Input As fid & ^1 b]f           lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9=6BQ`u           Close fid z>0$SBQ-       End If tS\Db'C7       Set oFSO = Nothing pYm#iz       Return UBound( lineArray ) ReD]M@;   K:qc "Q=C   End Function 5M9o(Z\AF   YahW%mv`d   Sub GetFileList( ByVal in_dir As String, _ h+!R)q8M                    ByRef in_flist() As String ) G9xO>Xp^Al   Het>G{       'Redimension the file list array 6Y6t.j0vN.       Erase in_flist gBWr)R   a %a0/!U[       'Tracks how many files are found <Piq?&VX[       Dim fCount As Long 4_CL1g       fCount = 0 [-"ZuUG   vfj{j= G       'Recurse directory and search for text files 8"NPj0       Dim f As String k^ fW/       f = Dir$(in_dir & "*.txt") 3?`TEw~'       While f <> "" %jf|efxo           ReDim Preserve in_flist(fCount) W`oyDg,D           in_flist(fCount) = f ToKG;Ff4b           fCount += 1 o(> #}[N}           f = Dir$() wpC.!T       Wend ts_|7Ev       ReDim Preserve in_flist(fCount-1)