RPC Photonics扩散片BSDF
摘要: }+B7C2_\ (r|T&'yK 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。 9@j~1G%^ kal8k-$# 背景: mSzwx/3" Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 Cjh&$aq 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。 u7;A`
图1. RPC Photonics工程漫射体结构及光束投射形状 EvYw$j Vy9n3W"FB1 _c&*'IY[V 步骤 YOY+z\Q ]`NbNr]K 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 f4_\F/ _(jE](,
图2. RPC Photonics工程漫射体不同类型的散射数据 A`r9"([-A 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) j@ "`!uPz 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 =.%ZF]Oe+# 例如下所示: cC[n~OV Sample name: EDF-C1-56 -r2cK{Hhp& Merging data from file EDF-C1-56 0-0.txt wx!*fy4hL Finished merging RPC data for sample EDF-C1-56 H )}WWXK FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt KZE.}8^%D 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 bXfOZFzq) a. 创建一个新的散射库 @v'D9 ? b. 散射模型命名 zbR.Lb c. 改变散射模型为“Tabulated BSDF”. EH3G|3^xz d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 0
mQ3P.9 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 &SM$oy#? 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, ]UI+6}r g. 点击OK 2mO#vTX4 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 D6]$P%t9 GlZ9k-ZRF =4D_-Q 脚本代码: cg.e(@( ^ZlV1G;/W@ '#Language "WWB-COM" 9e&#;6l b>z.d- Option Explicit ;?!rpj p^:Lj 9Qax Sub Main z|<oxF. =tNiIU 'Cleanup ^zJ.W ClearOutputWindow() `|w#K28t" OgS8.wX Print "Merging RPC Photonics BSDF Data Files" 9O Q4\ SetTextColor(255,0,0) HH#i.s2 Print "Note: Script should be located in the same folder as the BSDF TXT files." 55DzBV Print "Note: Do not run this script multiple times without deleting the output file between executions." xdM#>z`; SetTextColor(0,0,0) Mh|`XO.5I qtN29[x 'Current directory of this script (should be the same as the text files being merged) 0q>lW &J Dim cDir As String AL7O -D cDir = MacroDir$ & "\" 4sQAR6_SW~ -],?kP 'Array which will be populated with the list of files to be merged w2+]C&B* Dim fList() As String, curFile As String N]}+F w\5 GetFileList( cDir, fList ) }tZAU\z 1.H!A@ Print "" I0vnd7 Print "Files found for merging:" "V0:Lq For Each curFile In fList .^S78hr]n Print Chr(9) & curFile RM1uYFs< Next BmFME0 E@6r{uZ# 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. (VAL.v* Dim nameArray() As String, sampName As String ;cn.s, nameArray = Split(fList(0)," 0-0.txt") P i!r}m sampName = nameArray(0) xg^^ @o Print "" bMZn7c Print "Sample name: " & Chr(9) & sampName d`<^+p)oy 25n(&NV 'Open an output file and write the FRED header data SWsv, Dim outFile As String (y=o]Vy outFile = cDir & sampName & "_FRED.txt" eJGos!>* Open outFile For Output As #1 Qsxkw Print #1, "type bsdf_data" Gy6qLM Print #1, "format angles=deg bsdf=value scale=1" U<Y'.! 9*+0j2uhQ 'Loop the file list, skip the two header lines and write the remaining data to file %Dls36F Dim lineArray() As String, curLine As Long o;>3z*9?3 For Each curFile In fList +7<>x-+ Print "Merging data from file " & curFile ~:<@ ` ReadFile( cDir & curFile, lineArray ) d"6]? For curLine = 2 To UBound(lineArray) Fg\| e% Print #1, lineArray(curLine) w1#jVcUQ Next KBRg95E~]l Next h_chZB' '#i]SU&* 'Close the output file lhA
s!\F Close #1 Owpg]p yVD LL[#b2CKa Print "Finished merging RPC data for sample " & sampName .hlQ?\ Print "FRED formatted data file: " & Chr(9) & outFile RvS q KW8 End Sub VUC <0WV k?/ v y9 'Utility function to read the contents of a file into an array of strings. ?hJsN Function ReadFile(ByVal fileName As String, _ )*K<;WIWH ByRef lineArray() As String) As Long a5}44/% NVc!g ReadFile = -1 -j`!(IJ Dim oFSO As Object U 'CfP9= Set oFSO = CreateObject("Scripting.FileSystemObject") 2WPF{y%/ Erase lineArray .eabtGO, [Ql?Y$QB`4 Dim fid As Long ;*-@OLT_K If oFSO.fileexists( fileName ) Then nK h%E-c fid = FreeFile() V4eng " Open fileName For Input As fid Wz-3?EQ lineArray = Split(Input(LOF(fid), fid), vbCrLf) w38c Close fid _(6B. End If :q>oD-b$} Set oFSO = Nothing -Y8ks7 Return UBound( lineArray ) bwSRJFqb 6A$_&? End Function ,%?; \?b%h V%BJNJ Sub GetFileList( ByVal in_dir As String, _ Sj0 ucnuHi ByRef in_flist() As String ) ^%5~; 6MQs \ J6. 'Redimension the file list array f3zfRhkIk Erase in_flist H-_^TB 5%QC
][, 'Tracks how many files are found 5 dfe@$ Dim fCount As Long hY.e [+ fCount = 0 {UdcX~\~ X;OsH 'Recurse directory and search for text files w>6"Sc7oc2 Dim f As String Zk/' \(5 f = Dir$(in_dir & "*.txt") ]_ejDN\>{V While f <> "" ;]gsJ9FK< ReDim Preserve in_flist(fCount) i'W_;Y} in_flist(fCount) = f ~U"by_ fCount += 1 ]27>a"p59Y f = Dir$() I&pr_~. Wend YPha9M$AgU ReDim Preserve in_flist(fCount-1) ~aJW"\{ ;wJ7oj< End Sub z^gQ\\,4
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