RPC Photonics扩散片BSDF

ghW   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

-K6y#O@@   摘要： ym2"D?P (   0Q[;{}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。 W?du ]   d/\ajQ1::   背景： Cw~fP[5XMF   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。 <A&Zl&^1   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 1?,C d   fPG3$<Zr   [iC]Wh%   d5n>2iO   步骤 i>(TPj|   Raf-I+   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 DDZnNSo<JQ   图2. RPC Photonics工程漫射体不同类型的散射数据 l6.&<0pLT   l$m}aQ%h   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） i$CF *%+t   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 40 zO4   例如下所示： 0KjCM4t   Sample name:  EDF-C1-56 rv2;)3/*   Merging data from file EDF-C1-56 0-0.txt imyfki $B   Finished merging RPC data for sample EDF-C1-56 Nf}i/   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt T5wVJgN>   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 877Kv);   a. 创建一个新的散射库 *TPWLR ^   b. 散射模型命名 D0h6j0r5   c. 改变散射模型为“Tabulated BSDF”. 8[ :G/8VI   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 ） hd)WdGJp    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。 $}=r45e0K   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， K+Pa b ?   g. 点击OK =)J<R;   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 6#HnA"I2n   ~w}=Oby'y   M*aYcIU((   脚本代码： `)Y 5L}c=   @[{5{ y   '#Language "WWB-COM" Y[W]YPs   bl\;*.s'   Option Explicit f,ql8q(|J   N:,V{Pw   Sub Main LdnTdh?   W3n[qVZIC       'Cleanup ..=lM:13|       ClearOutputWindow() _WI~b   Y\F4       Print "Merging RPC Photonics BSDF Data Files" ;s#]."v_=       SetTextColor(255,0,0) Bk5ft4v-       Print "Note: Script should be located in the same folder as the BSDF TXT files." F1p|^hYDW       Print "Note: Do not run this script multiple times without deleting the output file between executions." \!*F:v0g^       SetTextColor(0,0,0) ,_K:DSiB   zbfe=J4c       'Current directory of this script (should be the same as the text files being merged) ~w(A3I.       Dim cDir As String & d* bQv$       cDir = MacroDir$ & "\" Y@+9Ukd/   He&A>bA)z       'Array which will be populated with the list of files to be merged c*R18,5-       Dim fList() As String, curFile As String <"av  /`;       GetFileList( cDir, fList ) AG"iS<u   IEWl I       Print "" Zt 1n H       Print "Files found for merging:" kRH D{6mol       For Each curFile In fList qipS`:TER           Print Chr(9) & curFile 2FGCf} ,       Next Bo ??1y   ACF_;4%&       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. pE$*[IvQ'       Dim nameArray() As String, sampName As String %h v-3L#V       nameArray = Split(fList(0)," 0-0.txt") EW/NH&{       sampName  = nameArray(0) ML%JTx0+Z       Print "" |RDE/       Print "Sample name: " & Chr(9) & sampName A@reIt   _,w*Rv5=       'Open an output file and write the FRED header data ozA%u,\7k       Dim outFile As String !k#N] 9D3       outFile = cDir & sampName & "_FRED.txt" }{v0}-~@       Open outFile For Output As #1 Z 2lX^z       Print #1, "type bsdf_data" ^b*ub(5Ot       Print #1, "format angles=deg bsdf=value scale=1" nyOvB#f   N8X)/W       'Loop the file list, skip the two header lines and write the remaining data to file 4ZB]n,pfT       Dim lineArray() As String, curLine As Long mOFp!(       For Each curFile In fList <iM}p^jX9           Print "Merging data from file " & curFile ZQmg;L&7           ReadFile( cDir & curFile, lineArray ) fLV@~T|           For curLine = 2 To UBound(lineArray) 8'u,}b)               Print #1, lineArray(curLine)  GD!!xt           Next d!"gb,ec       Next lT'V=,Y t   u3HaWf3       'Close the output file $[b1_Db       Close #1 OGW0lnQ/   !@>:k3DC&       Print "Finished merging RPC data for sample " & sampName X$ A ]7t       Print "FRED formatted data file: " & Chr(9) & outFile #vTF:r   End Sub #*G}v%Ow/u   'f6!a5qC   'Utility function to read the contents of a file into an array of strings. Ex{;&UWm   Function ReadFile(ByVal fileName As String, _ e{.P2rnh                     ByRef lineArray() As String) As Long 6lwWFR+k   7s;*vd>       ReadFile = -1 t<cWMx5ra       Dim oFSO As Object I!.-}]k       Set oFSO = CreateObject("Scripting.FileSystemObject") )(yKm/50       Erase lineArray j)}TZx4~   MED_#OS       Dim fid As Long D~,iI7ac       If oFSO.fileexists( fileName ) Then +sXnC \           fid = FreeFile() Y7`Dx'x           Open fileName For Input As fid H#QPcp@           lineArray = Split(Input(LOF(fid), fid), vbCrLf) YV6w}b:           Close fid ^!SwY_>       End If Qe=eer~jI       Set oFSO = Nothing UDb       Return UBound( lineArray ) Ev&aD   u)l[*";S   End Function (-{.T   Qa1G0qMEIF   Sub GetFileList( ByVal in_dir As String, _ x!UGLL]_M                    ByRef in_flist() As String ) d^`n/"Ice   xic&m5j m       'Redimension the file list array ;AT~?o`n       Erase in_flist !XY}\zKq   x%RE3J-       'Tracks how many files are found 6!RKZj)       Dim fCount As Long ;zi4W1       fCount = 0 f Jn4'Q*U   z!^3%kJJ>       'Recurse directory and search for text files EyV6uk~       Dim f As String `e5f69"       f = Dir$(in_dir & "*.txt") lI+KT_|L       While f <> "" 8FBXdk?A           ReDim Preserve in_flist(fCount) Fw6x (j"           in_flist(fCount) = f }do=lm?/           fCount += 1 M532>+A]Za           f = Dir$() <2PO3w?Z       Wend bd`}2vr       ReDim Preserve in_flist(fCount-1)