RPC Photonics扩散片BSDF

.h5[Q/*h   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

?Ovqp-sw   摘要： e=;AfK   ]Ww?QhJ   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。 =xJKIu   'hv k    背景： L^4-5`gj   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。 i'wAE:Xe   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 d[^~'V   >P $;79<   w{90`   Cp]"1%M,   步骤 adi[-L#   Y.U[wL>   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 FH%GIi   图2. RPC Photonics工程漫射体不同类型的散射数据 TdGnf    zyg  }F   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） \Z/)Y;|mi0   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 { e5/+W   例如下所示： , qrQ"r9   Sample name:  EDF-C1-56 9Xo[(h)5d   Merging data from file EDF-C1-56 0-0.txt *[R eb%   Finished merging RPC data for sample EDF-C1-56 ^ Dt#$Z   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt qTo-pAG`   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 4[-*~C|W5   a. 创建一个新的散射库 yxq}QSb \3   b. 散射模型命名 3y~r72J   c. 改变散射模型为“Tabulated BSDF”. Iu*^xn   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 ） m&iH2|   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。 gxMfu?zk"   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， dN}#2Bo=   g. 点击OK hyT1xa   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 9bq<GC'eX8   LJTQaItdqJ   D^;*U[F?   脚本代码： ~w;]c_{.b   uH;-z_Wpn!   '#Language "WWB-COM" _:B1_rz7,   u}|%@=xn   Option Explicit vuFBET,   3QOUU,Dt$   Sub Main AVU>+[.=%c   ([VV%ovZ       'Cleanup N9<Ujom       ClearOutputWindow() [ dE. [   VCcr3Dx()F       Print "Merging RPC Photonics BSDF Data Files" ?}Lg)EFH       SetTextColor(255,0,0) GzTq5uU&       Print "Note: Script should be located in the same folder as the BSDF TXT files." M}wXJ8aF?       Print "Note: Do not run this script multiple times without deleting the output file between executions." $CE[MZ&S       SetTextColor(0,0,0) `K >?j u"   )I-fU4?       'Current directory of this script (should be the same as the text files being merged) *VkgQ`c       Dim cDir As String 7RvUH-S[       cDir = MacroDir$ & "\" 6Ik,zQL   DK&h eVIoZ       'Array which will be populated with the list of files to be merged mG1IQ!       Dim fList() As String, curFile As String @v*/R%rv t       GetFileList( cDir, fList ) (?b@b[D~4   G^1b>K       Print "" `ZaT}#Y       Print "Files found for merging:" xT)psM'CL       For Each curFile In fList 1lnU77;           Print Chr(9) & curFile WWZ9._       Next V8~jf-\$b   x4#T G       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Jj^GWZRu       Dim nameArray() As String, sampName As String !"TZ:"VZU       nameArray = Split(fList(0)," 0-0.txt") 9OfFM9(:       sampName  = nameArray(0) X+n`qiwq       Print "" V=:_d,       Print "Sample name: " & Chr(9) & sampName NS,5/t   [&qA\       'Open an output file and write the FRED header data M'1!<a-Mp       Dim outFile As String 4E:bp        outFile = cDir & sampName & "_FRED.txt" b( ^^m:(w       Open outFile For Output As #1 +tN&a       Print #1, "type bsdf_data" e[t<<u3"       Print #1, "format angles=deg bsdf=value scale=1" VRW]a   :Ld!mRZF       'Loop the file list, skip the two header lines and write the remaining data to file ,A5)<}       Dim lineArray() As String, curLine As Long !z zW2>       For Each curFile In fList s/1 #DM"           Print "Merging data from file " & curFile =qvZpB7ZZ           ReadFile( cDir & curFile, lineArray ) qOG}[%<^n7           For curLine = 2 To UBound(lineArray) V8z`qEPM               Print #1, lineArray(curLine) ;#G%U!p           Next :<~7y.*O{       Next *xM/;)   8"vwU@cfC       'Close the output file qsg>5E       Close #1 )-/gLZsx   lg1PE7       Print "Finished merging RPC data for sample " & sampName $'[q4wo<       Print "FRED formatted data file: " & Chr(9) & outFile y0 2u?wJ   End Sub 5GAy "Xd   $rG<uO   'Utility function to read the contents of a file into an array of strings. w9#R'   Function ReadFile(ByVal fileName As String, _ u:`y]                     ByRef lineArray() As String) As Long \T-~JQVj   J%dJw}       ReadFile = -1 S9Yt1qb       Dim oFSO As Object px9>:t[P       Set oFSO = CreateObject("Scripting.FileSystemObject") f3 ]       Erase lineArray Z]-WFU_ N   b5e@oIK       Dim fid As Long +EASAq       If oFSO.fileexists( fileName ) Then 04y!\           fid = FreeFile() RFG$X-.e           Open fileName For Input As fid w&lZ42(mF           lineArray = Split(Input(LOF(fid), fid), vbCrLf) e4qj .b           Close fid \-. Tg!Q6       End If BEw{X|7       Set oFSO = Nothing Wtv#h~jy9       Return UBound( lineArray ) Y~"9L|`f/   Ud3""C5B   End Function S>ugRasZ$   MMD<I6Iyv   Sub GetFileList( ByVal in_dir As String, _ IF?xnu                    ByRef in_flist() As String ) h}=M^SL   Z%v6xP.       'Redimension the file list array Gidkt;lj       Erase in_flist nN ~GP"}   E5B8 Z?$a       'Tracks how many files are found & QY#3yj=       Dim fCount As Long c)1=U_61       fCount = 0 H,>#|F   K~>jApZ%       'Recurse directory and search for text files 3B,QJ&       Dim f As String J`Oy.Qu)       f = Dir$(in_dir & "*.txt") A'DVJ9%xB       While f <> "" s[-]cHQ           ReDim Preserve in_flist(fCount) ]M4NpUM           in_flist(fCount) = f R[yL_>           fCount += 1 [(cL/_           f = Dir$() iUNnPJh       Wend 5L&:_iQZy       ReDim Preserve in_flist(fCount-1)