RPC Photonics扩散片BSDF

vZeYp   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

Y`7#[g   摘要： )cK tc   V"by9p|V`   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。 d6@jEa-   ?hJsN   背景： Ym.l@(   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。 LbX6 p   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 NC.P2^%   >@^yj+k   3hXmYz(   ]6BmCh   步骤 ZE8/  m")   QPe9s[Y   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。 Q_kT}6#(J=   图2. RPC Photonics工程漫射体不同类型的散射数据 !P~ PF:W~|   45)ogg2   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） RCh$j&Tn   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 /LI~o~m1)   例如下所示： >1r[]&8   Sample name:  EDF-C1-56 {Bq"$M!Y   Merging data from file EDF-C1-56 0-0.txt F!)M<8jL&9   Finished merging RPC data for sample EDF-C1-56 wyrI8UY   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt iRUR4Zs   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 &V#zkW   a. 创建一个新的散射库 }(+=/$C"#   b. 散射模型命名 =(.mf   c. 改变散射模型为“Tabulated BSDF”. K=c=/`E   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） /NW>;J}C   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 xxoHH#a   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， A3MZxu=':3   g. 点击OK ii_|)udz   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 O2q=gYX>\   Ig02M_   &Mhv XHI   脚本代码： %oh`EGmVP   {UdcX~\~   '#Language "WWB-COM" ']ITuP8   #a(%(k S   Option Explicit >[|GC/ C   N)y^</Ya   Sub Main AaVI%$   _K0izKTA.       'Cleanup j<ABO")v       ClearOutputWindow() @],6SKbG6   R=vbUA       Print "Merging RPC Photonics BSDF Data Files" bkr~13S{+       SetTextColor(255,0,0) hv$uH7Fz       Print "Note: Script should be located in the same folder as the BSDF TXT files." S2rEy2\}:       Print "Note: Do not run this script multiple times without deleting the output file between executions." nDHHYp       SetTextColor(0,0,0) }osHA`x"2   'v\1:zi       'Current directory of this script (should be the same as the text files being merged) ,7^d9v3t       Dim cDir As String s[G|q5n       cDir = MacroDir$ & "\" Gur8.A;Y   mL:m;>JJ n       'Array which will be populated with the list of files to be merged a=J@yK       Dim fList() As String, curFile As String ;x:k-s2-       GetFileList( cDir, fList ) /h}PEu3y   KTG:I@|C       Print "" Ws-6W!Ib%       Print "Files found for merging:" ;cv.f>Cm       For Each curFile In fList '1W!xQ}E           Print Chr(9) & curFile O.@g/05C       Next 4Qa@`   R'Kt=.s<       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. J)9 AnGWe       Dim nameArray() As String, sampName As String 5h`m]#YEG       nameArray = Split(fList(0)," 0-0.txt") >_;kTy,       sampName  = nameArray(0) >I$B=       Print "" J+ Jt4       Print "Sample name: " & Chr(9) & sampName &$mZ?%^C   2[jL^XMM       'Open an output file and write the FRED header data PD6MyW05%9       Dim outFile As String 8weSrm       outFile = cDir & sampName & "_FRED.txt" UWQtvQ f       Open outFile For Output As #1 y;Qy"-)qb       Print #1, "type bsdf_data" W|)GV0YM       Print #1, "format angles=deg bsdf=value scale=1" E]?)FH<oP   oR*ztM       'Loop the file list, skip the two header lines and write the remaining data to file JB&G~7Q85       Dim lineArray() As String, curLine As Long @SU8\:(U       For Each curFile In fList {eEBrJJeB           Print "Merging data from file " & curFile EkN_8(w           ReadFile( cDir & curFile, lineArray ) WMW1B}Z3           For curLine = 2 To UBound(lineArray) >vUB%OLyP               Print #1, lineArray(curLine) h/,R{A2mO           Next QB!jLlg(       Next -glugVq   %b=Y <v       'Close the output file [/ AIKZM<       Close #1 :1:3Svb<Y   dZPW2yf       Print "Finished merging RPC data for sample " & sampName 7=}6H3|&       Print "FRED formatted data file: " & Chr(9) & outFile + c`AE   End Sub z)}3**3'y   ? m&IF<b   'Utility function to read the contents of a file into an array of strings.  }VF#\q   Function ReadFile(ByVal fileName As String, _ OkLz^R?d                     ByRef lineArray() As String) As Long e"]"F{Q   ~|h lE z       ReadFile = -1 538fK9[       Dim oFSO As Object *D2Nm9sl       Set oFSO = CreateObject("Scripting.FileSystemObject") WrNLGkt       Erase lineArray vkJ)FEar   *P`v^&       Dim fid As Long _}D%iJg#       If oFSO.fileexists( fileName ) Then $H'8 #:[d_           fid = FreeFile() Re>AsnA[           Open fileName For Input As fid S@x}QQ|.           lineArray = Split(Input(LOF(fid), fid), vbCrLf) cgyp5\*>+           Close fid 5L F/5`       End If WE0}$P:       Set oFSO = Nothing j.DHqHx       Return UBound( lineArray ) qP7G[%=v   nP<S6:s:   End Function wzd`l?o,   {;*}WPYb   Sub GetFileList( ByVal in_dir As String, _ ]fZ<`w8u}                    ByRef in_flist() As String ) @dl8(ILk'   NetYg]8`       'Redimension the file list array %`e`g ^       Erase in_flist PY?8[A+   9RH"d[%yc}       'Tracks how many files are found $xT1 1 ^       Dim fCount As Long joqWh!kv7U       fCount = 0 K1OkZ6kl   Oa! m       'Recurse directory and search for text files 8'_ 0g[s       Dim f As String 1]T|6N?       f = Dir$(in_dir & "*.txt") C ZJV_0       While f <> "" &R,9+c           ReDim Preserve in_flist(fCount) yYY Nu`           in_flist(fCount) = f fxd0e;NAAh           fCount += 1 ?Nf 5w           f = Dir$() qNxB{0(D       Wend nU2V]-qY       ReDim Preserve in_flist(fCount-1)