RPC Photonics扩散片BSDF

TjGe8L:   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

:^FOh*H   摘要： :BG/]7>|V   |i5A F\w   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。 @ 'rk[S}A   sY!PXD0Q   背景： )nyud$9w'   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。 703=.xj   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 mV0F^5   lq=|=   utKtxLX"   7. 9n   步骤 :-7`Lfi@%   D`PnY&ffT   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。 l~Je]Qt   图2. RPC Photonics工程漫射体不同类型的散射数据 q[1:h   nk9Kq\2f:   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） 1tU}}l   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 ;AK;%   例如下所示： C"_f3[Z   Sample name:  EDF-C1-56 tpj({    Merging data from file EDF-C1-56 0-0.txt $w`QQ^\   Finished merging RPC data for sample EDF-C1-56 ]W3D4Swq   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Es6b~#   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 \^vf`-uG   a. 创建一个新的散射库 _@jBz"aq\   b. 散射模型命名 c%c/mata?   c. 改变散射模型为“Tabulated BSDF”. ww82)m8   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） o1= 'Fr   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 u}hQF$a"   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， =XsdR?C   g. 点击OK {@1.2AWg   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 iJuh1+6:c9   od!"?F   Au &NQ+   脚本代码： ZYZQ? FN   G^ ]T   '#Language "WWB-COM" 9qkH~B7   8WK%g0gm   Option Explicit FCTz>N^p   gBz$RfyF   Sub Main bs$x%CR   @@K@;Jox       'Cleanup #$7 z       ClearOutputWindow() ^l;nBD#nJ   K[Bq,nPo       Print "Merging RPC Photonics BSDF Data Files" Yf >SV #       SetTextColor(255,0,0) j|!.K|9B       Print "Note: Script should be located in the same folder as the BSDF TXT files." 2GQq(_       Print "Note: Do not run this script multiple times without deleting the output file between executions." R?!xO-^t       SetTextColor(0,0,0) FU/yJy   \)859x&(       'Current directory of this script (should be the same as the text files being merged) L+2!Sc,>       Dim cDir As String 0o2o]{rM{2       cDir = MacroDir$ & "\" =SPuOy8   8`}(N^=}       'Array which will be populated with the list of files to be merged dP[l$/       Dim fList() As String, curFile As String eSf e s       GetFileList( cDir, fList ) [b-27\b   -]"=b\Q       Print "" [q]"_4L0;d       Print "Files found for merging:" T">-%-t       For Each curFile In fList {bn NY           Print Chr(9) & curFile rBLkowDP*       Next =ZM#_uW   ^G%Bj`%       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. gv$6\1       Dim nameArray() As String, sampName As String o8\@R       nameArray = Split(fList(0)," 0-0.txt") 6+"P$Ed#i       sampName  = nameArray(0) ZK<kn8JJ       Print "" !PUbaF-.6       Print "Sample name: " & Chr(9) & sampName i>6SY83B}   (yQ]n91Q,       'Open an output file and write the FRED header data ~8~B VwZ_       Dim outFile As String $~c?qU       outFile = cDir & sampName & "_FRED.txt" Okm&b g       Open outFile For Output As #1 R)?b\VK2$       Print #1, "type bsdf_data" f2Frb       Print #1, "format angles=deg bsdf=value scale=1" INSI$tA~   <e"O`*ZJ       'Loop the file list, skip the two header lines and write the remaining data to file M"[s5=:Lo       Dim lineArray() As String, curLine As Long H6?ZE       For Each curFile In fList :Z(?Ct&8           Print "Merging data from file " & curFile d!/@+i           ReadFile( cDir & curFile, lineArray ) mN3}wJ}J           For curLine = 2 To UBound(lineArray) s mub> V               Print #1, lineArray(curLine) [o8a(oC           Next jq(3y|6,       Next OD<0,r0f,   ^c{}G<U^       'Close the output file 2%\Nq:;T       Close #1 ZxkX\gl91   @!6eRp>Z       Print "Finished merging RPC data for sample " & sampName 'Ht$LqG       Print "FRED formatted data file: " & Chr(9) & outFile _.0c~\VA   End Sub d{+H|$L`   :0>wm@qCQ   'Utility function to read the contents of a file into an array of strings. )3v0ex@Jl   Function ReadFile(ByVal fileName As String, _ @ fm\ H                     ByRef lineArray() As String) As Long B[7|]"L@   _ b}\h,Ky       ReadFile = -1 <b"ynoM. A       Dim oFSO As Object ut%t`Y( ]       Set oFSO = CreateObject("Scripting.FileSystemObject") i.2O~30ST       Erase lineArray h-hU=I8   t$=FcKUV}f       Dim fid As Long pHFlO!#]|       If oFSO.fileexists( fileName ) Then o+{}O_r           fid = FreeFile() +(3"XYh           Open fileName For Input As fid 5} |O           lineArray = Split(Input(LOF(fid), fid), vbCrLf) 7t`<`BY^           Close fid k9UmTvX       End If 2#&9qGR       Set oFSO = Nothing D4'"GaCv       Return UBound( lineArray ) (WiA   "{;]T   End Function x^_Wfkch]   5P{dey!   Sub GetFileList( ByVal in_dir As String, _ xjOy3_Js                    ByRef in_flist() As String ) yAtM|:qq   @eMDRbgq;[       'Redimension the file list array ]3hz{zqV^       Erase in_flist [YP8z~   5:9Ay ?       'Tracks how many files are found ?@Z~i]gE[V       Dim fCount As Long uxk&5RY       fCount = 0 d+~c$(M)   udB:ys       'Recurse directory and search for text files $1oU^VY       Dim f As String OTd=(dwh       f = Dir$(in_dir & "*.txt") o*97Nbjn       While f <> "" ;+K:^*oJ           ReDim Preserve in_flist(fCount) LfyycC2E           in_flist(fCount) = f g#`(& k           fCount += 1 \*6%o0c           f = Dir$() |DfYH~@(       Wend "[@-p       ReDim Preserve in_flist(fCount-1)