RPC Photonics扩散片BSDF

'[liZCg   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

mbkt7. ,P   摘要： \f^xlX3&`   7>gjq'0   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。 E8 r6P:5d`   K0j%\]\Tp   背景： z8t;jw   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。 g&y (-   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 LEPLoF3,   @ !su7   Wjl2S+Cc   q`r| DcN~   步骤 H%Gz"   G$TO'C iu:   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。 Z[*unIk   图2. RPC Photonics工程漫射体不同类型的散射数据 BZQ}c<Nl   bKsjbYuo   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） 3f^Pr   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 J";N^OR{A%   例如下所示： h J`Gu7   Sample name:  EDF-C1-56 E&kv4,   Merging data from file EDF-C1-56 0-0.txt ;]grbqXVE   Finished merging RPC data for sample EDF-C1-56 i%.NP;Qq]M   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Oe\(=R   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 q{9 \hEeb   a. 创建一个新的散射库 q( ~rk   b. 散射模型命名 xAd@.^   c. 改变散射模型为“Tabulated BSDF”. ?lD)J?j   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 ） .o`Io[io   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。 [yN+(^i   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， H;\C7w|   g. 点击OK V5Z C2H   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 kqih`E9P7B   *t| !xO   $T3_~7N   脚本代码： qA)YYg/G   .kU^)H"l   '#Language "WWB-COM" ,V!"4T,Z   yR|2><A   Option Explicit y*^UGJC:   *tj(,:!   Sub Main n?cC]k;P~   b)'CP Cu*       'Cleanup GgY8\>u       ClearOutputWindow() LXX('d   o]&q'>Rf       Print "Merging RPC Photonics BSDF Data Files" BM?!?       SetTextColor(255,0,0) 03 gbcNo       Print "Note: Script should be located in the same folder as the BSDF TXT files." /5Qh*.(S       Print "Note: Do not run this script multiple times without deleting the output file between executions." }~zDcj_       SetTextColor(0,0,0) yC 1OeO8{   o+{,>t       'Current directory of this script (should be the same as the text files being merged) b3-j2`#       Dim cDir As String FhUi{`       cDir = MacroDir$ & "\" /xJD/"Y3&   #[9UCX^=       'Array which will be populated with the list of files to be merged fB9,# F       Dim fList() As String, curFile As String 6k;5T       GetFileList( cDir, fList ) @Nsn0-B?ne   hT-^1:N       Print "" X<8|uP4       Print "Files found for merging:" 0,RY O :`       For Each curFile In fList <e BmCrJ           Print Chr(9) & curFile dQ{qA(m       Next hOk 9y=   36OQHv;&       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?:9y !Q=       Dim nameArray() As String, sampName As String G3TS?u8Q       nameArray = Split(fList(0)," 0-0.txt") u] NsCHKlT       sampName  = nameArray(0) I"czo9Yspd       Print "" 0=HB!{@       Print "Sample name: " & Chr(9) & sampName kl:/PM^   Cydo~/       'Open an output file and write the FRED header data ]dGH i \       Dim outFile As String *Lrrl       outFile = cDir & sampName & "_FRED.txt" A@< !'       Open outFile For Output As #1 uQdH():       Print #1, "type bsdf_data" nD/B:0'       Print #1, "format angles=deg bsdf=value scale=1" eGQ4aQhi   .B~yI3D`M       'Loop the file list, skip the two header lines and write the remaining data to file p35)K5V       Dim lineArray() As String, curLine As Long K>.}>)0       For Each curFile In fList 9~Sa7P           Print "Merging data from file " & curFile YQ:$m5ai           ReadFile( cDir & curFile, lineArray ) @uyQH c,V           For curLine = 2 To UBound(lineArray) BN]o!Y               Print #1, lineArray(curLine) ZVH 9je           Next yT OZa-       Next N~/X.D4e#   Wtu-g**KN       'Close the output file 0(+<uo~6p1       Close #1 yWRIh*>nE   'L O3[G{       Print "Finished merging RPC data for sample " & sampName =Ks&m4       Print "FRED formatted data file: " & Chr(9) & outFile XuJyso9kA   End Sub ]*a(^*}A%   WDxcV%   'Utility function to read the contents of a file into an array of strings. `m(ZX\W]   Function ReadFile(ByVal fileName As String, _ 7#"NKxb                     ByRef lineArray() As String) As Long '{cND   KtAEM;g       ReadFile = -1 _$T !><)y       Dim oFSO As Object 0);5cbV7i       Set oFSO = CreateObject("Scripting.FileSystemObject") ?&:N|cltD       Erase lineArray 6,LE_ -G5   dl=)\mSFjF       Dim fid As Long -n"f>c_{>       If oFSO.fileexists( fileName ) Then (^B1Kt!<           fid = FreeFile() YkFLNCg4}           Open fileName For Input As fid JzywSQ           lineArray = Split(Input(LOF(fid), fid), vbCrLf) z@IG"D           Close fid KF *F       End If PYi<iSr       Set oFSO = Nothing >yn?@ve@       Return UBound( lineArray ) c(Y~5A{TXO   )OQm,5F1   End Function f1SKOq   _s#J\!F   Sub GetFileList( ByVal in_dir As String, _ AUF[hzA                    ByRef in_flist() As String ) %6lGRq{/?    Hvz;[!       'Redimension the file list array tlO=>       Erase in_flist {@Lun6\   ]+ub R;       'Tracks how many files are found oD2 ! [&       Dim fCount As Long .mrv"k\<       fCount = 0 $H@    hs+)a%A3G       'Recurse directory and search for text files ]2"UR_x       Dim f As String S`[(y?OF?       f = Dir$(in_dir & "*.txt") A1B[5a*o!       While f <> "" Rh~j -;           ReDim Preserve in_flist(fCount) uh9b!8           in_flist(fCount) = f M1P;x._n           fCount += 1 *cFGDQ!           f = Dir$() =1>G* ,       Wend s +S6'g--       ReDim Preserve in_flist(fCount-1)