RPC Photonics扩散片BSDF

yUEUIPL   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

VbA#D4;   摘要： _|H]X+|   0~n=|3*P   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。 A O/J:`   }5DyNfZ]+0   背景： }54\NSj0   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。 183'1Z$KA   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 |{ *ce<ip5   VWbgusxJ   HykJ}ezX4   3tOnALv   步骤 ap_(/W   r1F5&?{q   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 B;?a. 81~   图2. RPC Photonics工程漫射体不同类型的散射数据 63F0Za}h   b/ ~&M+)   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） 4my8 p Fk   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 HHg=:>L z   例如下所示： a=C?fh   Sample name:  EDF-C1-56 gsT%_2>CL   Merging data from file EDF-C1-56 0-0.txt )[%#HT   Finished merging RPC data for sample EDF-C1-56 l^"g pO${K   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt  (lt/ t   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Q.vtU%T   a. 创建一个新的散射库 nFxogCn   b. 散射模型命名 zb:p,T@5   c. 改变散射模型为“Tabulated BSDF”. NhpGa@[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 ） nA%-<   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。 5r`g6@   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， [.3M>,)+-   g. 点击OK P#76ehR]K   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 _gw~A{O   7j._3'M=Kc   ob-be2EysH   脚本代码： K<\TF+   mxDy!:@=   '#Language "WWB-COM" Xj|j\2$ 0   O:k@'&   Option Explicit Nu|?s-   qRB&R$   Sub Main qj=12;   ]]9eUw=       'Cleanup se7_:0+w       ClearOutputWindow() \s+< w3   ^Z2%b>       Print "Merging RPC Photonics BSDF Data Files" qmJFXnf       SetTextColor(255,0,0) Etn]e;z4       Print "Note: Script should be located in the same folder as the BSDF TXT files." RwY) O5       Print "Note: Do not run this script multiple times without deleting the output file between executions." QeU>%qKT       SetTextColor(0,0,0) [Zgy,j\\   }2JSa8       'Current directory of this script (should be the same as the text files being merged) g[:5@fI#*       Dim cDir As String KHdj#3<AR       cDir = MacroDir$ & "\" &ec_jxF   fZXd<Fg+       'Array which will be populated with the list of files to be merged >Li ~Og@       Dim fList() As String, curFile As String ,!u^E|24       GetFileList( cDir, fList ) /m9t2,KB   D:%$a]_f       Print "" H6e^"E       Print "Files found for merging:" .RoO6:T6       For Each curFile In fList Z1OX9]##r           Print Chr(9) & curFile B/pNM81(       Next ka"jv"z   ,>"1'i&@       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. @(Q4       Dim nameArray() As String, sampName As String Gz^g!N[       nameArray = Split(fList(0)," 0-0.txt") J& yDX>       sampName  = nameArray(0) ,]20I _       Print "" U3A>#EV       Print "Sample name: " & Chr(9) & sampName ITq+Hk R   i~k?k.t8       'Open an output file and write the FRED header data r\_aux^z       Dim outFile As String kZf7       outFile = cDir & sampName & "_FRED.txt" x"_f$,:!       Open outFile For Output As #1 gY;N>Yq,C       Print #1, "type bsdf_data" C,jPr )6)       Print #1, "format angles=deg bsdf=value scale=1" <6-(a;T!7   Q;5aM%a`       'Loop the file list, skip the two header lines and write the remaining data to file zgVplp       Dim lineArray() As String, curLine As Long `M"b L|[R       For Each curFile In fList L'z?M]           Print "Merging data from file " & curFile [NaU\;w\           ReadFile( cDir & curFile, lineArray ) c( gUH           For curLine = 2 To UBound(lineArray) E39:}_IV               Print #1, lineArray(curLine) )mwY] !           Next rA{h/T"       Next kZF\V7k   H${Ym BG       'Close the output file uyAhN       Close #1 qY#*zx   WDgp(Av!       Print "Finished merging RPC data for sample " & sampName ChGwG.-%L       Print "FRED formatted data file: " & Chr(9) & outFile 'KyT]OObS   End Sub 1NJ*EzJ~?   1&wZJP=   'Utility function to read the contents of a file into an array of strings. nc@ul')   Function ReadFile(ByVal fileName As String, _ _H:SoJ'                     ByRef lineArray() As String) As Long 5nf|CQH6?   C|z`hNp       ReadFile = -1 }R}tIC-:       Dim oFSO As Object 7+=j]+O       Set oFSO = CreateObject("Scripting.FileSystemObject") xZ4\.K\f]       Erase lineArray Rra(/j<rQ   Ig$5Ui       Dim fid As Long VO++(G)       If oFSO.fileexists( fileName ) Then REFisH-           fid = FreeFile() l  4~'CLi           Open fileName For Input As fid F"B!r-J           lineArray = Split(Input(LOF(fid), fid), vbCrLf) r+$ 0u~^           Close fid ;zz"95X7       End If 5dYIL `       Set oFSO = Nothing Z<ke!H       Return UBound( lineArray ) @X4;fd   #9 }Oqm   End Function U76:F?MH   y>wr $   Sub GetFileList( ByVal in_dir As String, _ G_dia6                    ByRef in_flist() As String ) 5{cA awU.   i<%(Z[9Lk       'Redimension the file list array /vU9eh"%       Erase in_flist 1l1 X1   {9C(\i +       'Tracks how many files are found fI}-?@       Dim fCount As Long ;{HxY98Q       fCount = 0 hoU&'P8   Snh\Fgdz       'Recurse directory and search for text files X>*zA?:       Dim f As String ](8XC_-U'       f = Dir$(in_dir & "*.txt") D0"+E*        While f <> "" A.z~wu%(           ReDim Preserve in_flist(fCount) }m0Lr:vq<r           in_flist(fCount) = f @^;\(If2           fCount += 1 %M'"%Yn@(y           f = Dir$() Kz^aW       Wend w8@MUz}/#       ReDim Preserve in_flist(fCount-1)