RPC Photonics扩散片BSDF

$dZ>bXUw:   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

w{e3U7;   摘要： Ld}(*-1i   UC+7-y,    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。 vJj:9KcP>h   uO_,n   背景： ]o[X+;Tj|   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。 %%+mWz a   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 9oje`Ay   tFvgvx\:   Cb )=n6   x?f0Hk+   步骤 Z.aLk4QO@   ])QO%   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。 e>,9]{N+$   图2. RPC Photonics工程漫射体不同类型的散射数据 %uz|NRB=   ~.W=   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） 4C,kA+P   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 u 5Eo   例如下所示： VA=#0w   Sample name:  EDF-C1-56 3b|7[7}&   Merging data from file EDF-C1-56 0-0.txt OK M\"A4   Finished merging RPC data for sample EDF-C1-56 zM_ DE    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt O>SuZ>g+7   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 % U W=:   a. 创建一个新的散射库 1#>&p%P!   b. 散射模型命名 tKG;k"wk   c. 改变散射模型为“Tabulated BSDF”. 9raHSzK@d   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 ） 5 Q6{(q|M   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。 =`]|/<=9'U   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， W>}Qer4   g. 点击OK .K |P&   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 dysX   H5AK n*'7   a9D gy_!Y   脚本代码： d s|8lz,   C(F1VS   '#Language "WWB-COM" FX|0R#4vm   FG>;P]mvp   Option Explicit Pn'`Q S?   .8T\Nr\~2   Sub Main Z7/vrME6   qa 6=W       'Cleanup YW8K $W       ClearOutputWindow() [^?13xMb   >vD['XN,       Print "Merging RPC Photonics BSDF Data Files" <CNE>@-f       SetTextColor(255,0,0) DC $7B`#D       Print "Note: Script should be located in the same folder as the BSDF TXT files." &5kZ{,-eM       Print "Note: Do not run this script multiple times without deleting the output file between executions." u;+%Qh       SetTextColor(0,0,0) @@xO+$6   ~a'nHy1       'Current directory of this script (should be the same as the text files being merged) o5N]((9       Dim cDir As String \3t,|%v       cDir = MacroDir$ & "\" ?vZWUWa   7XUhJN3n       'Array which will be populated with the list of files to be merged V~'k1P4       Dim fList() As String, curFile As String }': EJ~H       GetFileList( cDir, fList ) *C4~}4WT\   n!UMU^       Print "" =gW"#ZjL){       Print "Files found for merging:" gf:vb*#Wa       For Each curFile In fList s~'9Hv9           Print Chr(9) & curFile Q<RT12|`       Next %$/=4f.j   6PiEa(       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. =: 4'       Dim nameArray() As String, sampName As String ,(j>)g2Ob       nameArray = Split(fList(0)," 0-0.txt") J*}VV9H       sampName  = nameArray(0) q$MHCq;       Print "" b%3Q$wIJ6       Print "Sample name: " & Chr(9) & sampName NlA*\vco   -`-ACWeNV       'Open an output file and write the FRED header data >:.w7LQy/       Dim outFile As String !aQIh       outFile = cDir & sampName & "_FRED.txt" SW3wMPy&s       Open outFile For Output As #1 &[NVP&9&U       Print #1, "type bsdf_data" nURvy}<r       Print #1, "format angles=deg bsdf=value scale=1" NOF?LV   |tG05+M       'Loop the file list, skip the two header lines and write the remaining data to file +7Sf8tg\       Dim lineArray() As String, curLine As Long M{*kB2jr       For Each curFile In fList lN);~|IOv7           Print "Merging data from file " & curFile p9/bzT34.           ReadFile( cDir & curFile, lineArray ) IKvd!,0xf           For curLine = 2 To UBound(lineArray) n)tU9@4Np               Print #1, lineArray(curLine) zXQVUhL6           Next dj3|f{kg{       Next Lqg]Fd   1pWk9Xuh       'Close the output file ah 4kA LO       Close #1 3b<: :t   ]9fS@SHdx       Print "Finished merging RPC data for sample " & sampName D._{E*vg       Print "FRED formatted data file: " & Chr(9) & outFile +<gg   End Sub ~GSpl24W<   (2: N;   'Utility function to read the contents of a file into an array of strings. a4%`"   Function ReadFile(ByVal fileName As String, _ 5RW@_%C                     ByRef lineArray() As String) As Long ex.+'m<g   - y%QRO(       ReadFile = -1 v,n);       Dim oFSO As Object VxNXd?       Set oFSO = CreateObject("Scripting.FileSystemObject") V:(y*tFA       Erase lineArray K-Re"zsz   3*G5F}7%=       Dim fid As Long [C~fBf5       If oFSO.fileexists( fileName ) Then 5n:nZ_D           fid = FreeFile() ]Fxku<z7|           Open fileName For Input As fid >Q&CgGpW$           lineArray = Split(Input(LOF(fid), fid), vbCrLf) aXC!t           Close fid YmOldR9v(       End If n4Vwao/9x       Set oFSO = Nothing WmNA5;<Q       Return UBound( lineArray ) 8IeI0f"l)   aUAcRW   End Function < /,.K`''W   CdZnD#F2   Sub GetFileList( ByVal in_dir As String, _ p*Xix%#6                    ByRef in_flist() As String ) =`JW1dM   )5U!>,fT       'Redimension the file list array g#w`J\iz       Erase in_flist ;3mL^   &0s*PG       'Tracks how many files are found / HL_$g<       Dim fCount As Long C(}^fJ6r       fCount = 0 N=q#y@L   2.ew^D#       'Recurse directory and search for text files V- /YNRV       Dim f As String XJc ,uj7       f = Dir$(in_dir & "*.txt") ,}KwP*:Z       While f <> "" 5lGQ#r           ReDim Preserve in_flist(fCount) <Kg2$lu(_`           in_flist(fCount) = f '(tj[&aL           fCount += 1 uj)yk*           f = Dir$() _p0)vT       Wend QPX`l0V       ReDim Preserve in_flist(fCount-1)