RPC Photonics扩散片BSDF

b9Ix* !Y   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

pK2n'4 C   摘要： &_c5C   G|]39/OO3{   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。 ?jBh=X\]:   ;6zp,t0   背景： 9_S>G$ 9D   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。 .We"j_ }   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 *8QGv6*vQ   .7GAGMNS   (svd~he2   MU&P+Wr   步骤 b<rJ@1qtJ   _\xd]~ELj   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。 =G2A Ufn   图2. RPC Photonics工程漫射体不同类型的散射数据 "Q@ZS2;A   ep"54o5=d   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） u>-!5=D8   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 bQM_rqjJGw   例如下所示： n \y%5J+   Sample name:  EDF-C1-56 lN^} qg><   Merging data from file EDF-C1-56 0-0.txt [HhdeLOX   Finished merging RPC data for sample EDF-C1-56 DPsf]   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6|:]2S   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 mI~k@!3   a. 创建一个新的散射库 mM7S9^<UH   b. 散射模型命名 ^Ru/7pw5   c. 改变散射模型为“Tabulated BSDF”. d6k`=Hlg   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 ） Ea*Jl<   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。 LA^H213N|   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， k/#& ]8(   g. 点击OK 0zAj.iG   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 0TI+6u   P1 `-OM   9f4#b8   脚本代码： =r:-CRq(   7L:$Amb_F   '#Language "WWB-COM" ^*]0quu=z   k iCg+@nT   Option Explicit b1;80P/:D   29#;;n}p   Sub Main v(t?d   A%s"WSx,       'Cleanup r`L$[C5I       ClearOutputWindow() i.Qy0   { O*maE"       Print "Merging RPC Photonics BSDF Data Files" c.PPVqx       SetTextColor(255,0,0) ~WJEH#       Print "Note: Script should be located in the same folder as the BSDF TXT files." vF=d`T<       Print "Note: Do not run this script multiple times without deleting the output file between executions." ukr a)>Y[|       SetTextColor(0,0,0) J,E'F!{   bewi.$E{       'Current directory of this script (should be the same as the text files being merged) %o+VZEH3       Dim cDir As String *Gm %Dn       cDir = MacroDir$ & "\" .Go3'$'v   GIDC'       'Array which will be populated with the list of files to be merged zKWcDbj       Dim fList() As String, curFile As String W/uaNp       GetFileList( cDir, fList ) %fpcH   e}e\*BL       Print "" j%KLp4J/e       Print "Files found for merging:" ht S5<+Y       For Each curFile In fList KwRO?G9&           Print Chr(9) & curFile A|YqBl       Next Nze#u;   ,bCPO`45       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. M>~jLu0@       Dim nameArray() As String, sampName As String h"')D       nameArray = Split(fList(0)," 0-0.txt") xgtdmv%       sampName  = nameArray(0) Tp`by 1s       Print "" ^6ZA2-f/<8       Print "Sample name: " & Chr(9) & sampName %9=^#e+pE   ~OEP)c\k       'Open an output file and write the FRED header data 81/Bn!       Dim outFile As String ~'HwNzDQc       outFile = cDir & sampName & "_FRED.txt" 0bpl3Fh.v       Open outFile For Output As #1 (CH F=g       Print #1, "type bsdf_data" gRKmfJ*u       Print #1, "format angles=deg bsdf=value scale=1" >"S'R9t   y2^r.6"O       'Loop the file list, skip the two header lines and write the remaining data to file Xt/muV       Dim lineArray() As String, curLine As Long ])a?ri       For Each curFile In fList xk}YeNVj           Print "Merging data from file " & curFile fdzD6KZI           ReadFile( cDir & curFile, lineArray ) ^c^9kK'           For curLine = 2 To UBound(lineArray) "S^;X @#v               Print #1, lineArray(curLine) .)B_~tct           Next s&M6DFlA       Next A[!Fg0X0   VD.p"F(]       'Close the output file ~y^#?;       Close #1 Sz"J-3b^   r 06}@7       Print "Finished merging RPC data for sample " & sampName w=3@IW       Print "FRED formatted data file: " & Chr(9) & outFile h&5H`CR[   End Sub ^C@uP9g   r+>E`GGQ   'Utility function to read the contents of a file into an array of strings. VD+8j29   Function ReadFile(ByVal fileName As String, _ SA{A E9y                     ByRef lineArray() As String) As Long 'e\m6~u\hm   ~|pVz/s|G       ReadFile = -1 2:/'       Dim oFSO As Object M:nXn7)+       Set oFSO = CreateObject("Scripting.FileSystemObject") ZqkP# ]+Y'       Erase lineArray rFn;z}J2   L; 5jhVy       Dim fid As Long C&3#'/&       If oFSO.fileexists( fileName ) Then l@<^V N@           fid = FreeFile() @k,u xe-           Open fileName For Input As fid r&xqsZ%R           lineArray = Split(Input(LOF(fid), fid), vbCrLf) i3*?fMxhu)           Close fid Lz=nJn       End If =6j  5,       Set oFSO = Nothing <i~ ( 8F\       Return UBound( lineArray ) 7|T5N[3?l,   d^Ra1@0"q2   End Function &m4 \"X@   hn.9j"   Sub GetFileList( ByVal in_dir As String, _ naXo <B                    ByRef in_flist() As String ) v(=fV/   )Bl% {C       'Redimension the file list array zV4%F"-       Erase in_flist 3>0/WbA:7E   ?qw&H /R       'Tracks how many files are found /pFg<       Dim fCount As Long )wpBxJ;dB}       fCount = 0 0[T!}F^%e   ZHICpL       'Recurse directory and search for text files v.cB3/$z       Dim f As String doP4N6       f = Dir$(in_dir & "*.txt") Rh9>iA@fd       While f <> "" 0X0HDQ           ReDim Preserve in_flist(fCount) WaN0$66[:           in_flist(fCount) = f mv SNKS           fCount += 1 Q2^}NQO=           f = Dir$() T!pWU*aB       Wend ~{Tus.jk       ReDim Preserve in_flist(fCount-1)