RPC Photonics扩散片BSDF

DrxQ(yo}   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

H?xYS| n   摘要： A%^7D.j   E'SDT*EI   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。 %so{'rQl   _./s[{ek   背景： L<Z,@q`   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。 P$*Ngt   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 %&V%=-O_7   n%4/@M   ;G3?Sa7+   n}(A4^=4KQ   步骤 YV@efPy}n   x7G*xHJ   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 o[+t}hC[   图2. RPC Photonics工程漫射体不同类型的散射数据 mF jM6pmo   Eciu^   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） Vi}E9I4   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 %:;g|PC   例如下所示： !H9^j6|   Sample name:  EDF-C1-56 x',6VTz^   Merging data from file EDF-C1-56 0-0.txt Np ru   Finished merging RPC data for sample EDF-C1-56 ;ny9q   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt N>]J$[j   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 mo(>SnS<   a. 创建一个新的散射库 v'S5F@ln   b. 散射模型命名 P~iZae   c. 改变散射模型为“Tabulated BSDF”. p?4[nS-,   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 ） dh&> E   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。 eR6vO5to   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， \4C[<Gbx$(   g. 点击OK )4c?BCgy   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 EUQtl_h/H   CA5`uh   lm D[Cn   脚本代码： & 0WQF    :XG~AR/   '#Language "WWB-COM" R<{Vgy   9|v%bO   Option Explicit ,u)jZ7   aW{5m@p{"   Sub Main ACZK]~Y'N*   0_MtmmL.       'Cleanup 5$cjCjY       ClearOutputWindow() '\xE56v)F   RwOOe7mv       Print "Merging RPC Photonics BSDF Data Files" VO=Ibu&X       SetTextColor(255,0,0) 5$N#=i`V       Print "Note: Script should be located in the same folder as the BSDF TXT files." V %D1Q}X       Print "Note: Do not run this script multiple times without deleting the output file between executions." n\JI7A}       SetTextColor(0,0,0) v}d)uPl};   ctjQBWE       'Current directory of this script (should be the same as the text files being merged) HTGLFY(&       Dim cDir As String ?# _{h       cDir = MacroDir$ & "\" k,k>w#&   P*~ vWYH9       'Array which will be populated with the list of files to be merged C1UU v=|       Dim fList() As String, curFile As String 72yJv=G       GetFileList( cDir, fList ) yRXWd*9   ZILJXX4       Print "" b:p0@|y       Print "Files found for merging:" g< .Is V       For Each curFile In fList _6ck@           Print Chr(9) & curFile Y|Gp\       Next xz.Jmv   -C3[:g       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. u;c W IRG       Dim nameArray() As String, sampName As String NlKVl~_ C       nameArray = Split(fList(0)," 0-0.txt") PM#3N2?|E       sampName  = nameArray(0) kROIVO1|`       Print "" Z${eDl6i       Print "Sample name: " & Chr(9) & sampName Ddpcov   GJrmK       'Open an output file and write the FRED header data *qk7e[IP       Dim outFile As String T]-MrnO       outFile = cDir & sampName & "_FRED.txt" 9 i/ (       Open outFile For Output As #1 /W BmR R       Print #1, "type bsdf_data" !U m9ceK       Print #1, "format angles=deg bsdf=value scale=1" 6uFw+Ya#   83t/\x,Q       'Loop the file list, skip the two header lines and write the remaining data to file /o'lGvw       Dim lineArray() As String, curLine As Long aK@ Y) Ju'       For Each curFile In fList Z_m<x!           Print "Merging data from file " & curFile x;z=[eE           ReadFile( cDir & curFile, lineArray ) ?u@jedQ           For curLine = 2 To UBound(lineArray) 5:f!EMb               Print #1, lineArray(curLine) p$' S\W|           Next 6WGg_x?3       Next :;]9,n   lMvOYv       'Close the output file ~i>DF`w$       Close #1 5}ftiy[Yc   w3);ZQ|       Print "Finished merging RPC data for sample " & sampName 4dPTrBQ?       Print "FRED formatted data file: " & Chr(9) & outFile 1*dN. v:5   End Sub kexV~Q   xwof[BnEZ   'Utility function to read the contents of a file into an array of strings. W3/bM>1   Function ReadFile(ByVal fileName As String, _ :e;6oC*"q                     ByRef lineArray() As String) As Long #YE?&5t   89(qU       ReadFile = -1 V@k+RniEO       Dim oFSO As Object F!ztU8,       Set oFSO = CreateObject("Scripting.FileSystemObject") )-Hs]D:       Erase lineArray J#F5by%8   "j,v lG       Dim fid As Long [=q/f2_1.       If oFSO.fileexists( fileName ) Then u5k{.&           fid = FreeFile() j2_j5Hgo           Open fileName For Input As fid X%IqZ{{           lineArray = Split(Input(LOF(fid), fid), vbCrLf) 5buW\_G)           Close fid >aO.a[AM       End If v4"Ukv       Set oFSO = Nothing m]>zdP+       Return UBound( lineArray ) 7UMZs7L$   rBTg"^jsw   End Function +yWD>PY(   e,e(t7c?d   Sub GetFileList( ByVal in_dir As String, _ rtJER?A                    ByRef in_flist() As String ) M x#L|w`r   ?I[8rzBWU       'Redimension the file list array WT< }3(S'?       Erase in_flist CE`] X;#y   nXLz<wE       'Tracks how many files are found 7b>_vtrt       Dim fCount As Long /x ?@Mn>       fCount = 0 [8sYEh   rAu%bF       'Recurse directory and search for text files h{^v756L       Dim f As String 4@{cK |       f = Dir$(in_dir & "*.txt") `z(o01y       While f <> "" H@1'El\9           ReDim Preserve in_flist(fCount) 3&^hf^yg           in_flist(fCount) = f 8Re[]bE           fCount += 1 \+R%KA/F           f = Dir$() .h=n [`RB       Wend T(?w}i       ReDim Preserve in_flist(fCount-1)