摘要: J Covk1
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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。 aE(j_`L78 E5G=Kh[NP 背景: lf\]^yM # 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。 <M|kOi 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。 r9uuVxBD 图1. RPC Photonics工程漫射体结构及光束投射形状
A/EW57v" 1x#Z}XG jn9KQe\3 步骤 V'4sOn
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Hr 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。 ,9W|$2=F }?=$?3W 图2. RPC Photonics工程漫射体不同类型的散射数据
zviEk/:zm 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) D"m]`H 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 BV X6 例如下所示: +Q3i&"QB. Sample name: EDF-C1-56 h$EH|9HAb Merging data from file EDF-C1-56 0-0.txt }Q?,O Finished merging RPC data for sample EDF-C1-56 @exeHcW61 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt pAo5c4y!4 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 !giL~}j(R a. 创建一个新的散射库 :!\?yj{{ b. 散射模型命名 c3&;Y0SD c. 改变散射模型为“Tabulated BSDF”. ~4\J}Kn 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 ) ((}T^ 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。 !A
)2<<4 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, `)5E_E3 g. 点击OK _>8ZL)NQQ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 i[_WO2 1>1&NQ#} %># VhK 脚本代码: c_e2'K: Quy&CV{@ '#Language "WWB-COM" :O}= $[ l.c*,9
Option Explicit |?=K'[5 .|Pq!uLvc Sub Main GRK+/1C j>(O1z7 'Cleanup P5Y:c@u2 ClearOutputWindow() 0HA` |^^'GZ%a Print "Merging RPC Photonics BSDF Data Files" TzT(aWP" SetTextColor(255,0,0) /*)zQ?N Print "Note: Script should be located in the same folder as the BSDF TXT files." -s5j^U{h| Print "Note: Do not run this script multiple times without deleting the output file between executions." Wp"+\{@) SetTextColor(0,0,0) *UVo>; r5kKNyJ 'Current directory of this script (should be the same as the text files being merged) a7+w)]r Dim cDir As String X!,2/WT cDir = MacroDir$ & "\" 3 xSt -MA V7Z+@e-5
'Array which will be populated with the list of files to be merged );o2eV Dim fList() As String, curFile As String #"J8]3\F GetFileList( cDir, fList ) xx`xDD }&+b\RE Print "" :C*7DS Print "Files found for merging:" ;x/do?FbT For Each curFile In fList +yvtd]D$2W Print Chr(9) & curFile ]W^F!p~eC Next WC6yQSnY& &M p??{g 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. hXBAs*4DV8 Dim nameArray() As String, sampName As String W rB:)Q(8= nameArray = Split(fList(0)," 0-0.txt") V\$'3(* sampName = nameArray(0) k1l\Rywp Print "" ~:`5Y"Av: Print "Sample name: " & Chr(9) & sampName a<c]N:1 HjCWsQM 'Open an output file and write the FRED header data TR;" &'#k Dim outFile As String r%`g` It outFile = cDir & sampName & "_FRED.txt" (X=JT Open outFile For Output As #1 0_F6t- Print #1, "type bsdf_data" a_jw4"Sb Print #1, "format angles=deg bsdf=value scale=1" Nm;yL .
V5Pr}"y 'Loop the file list, skip the two header lines and write the remaining data to file V
iY -&q' Dim lineArray() As String, curLine As Long e"7<&%
Oq For Each curFile In fList "DN0|%`M/ Print "Merging data from file " & curFile 6_Ps*Ed ReadFile( cDir & curFile, lineArray ) Gw!VPFV>W For curLine = 2 To UBound(lineArray) ENZjRf4 Print #1, lineArray(curLine) =E6ND8l@2 Next <v&L90+s\; Next 2/Xro rV I5#KLZVg 'Close the output file lZ5LHUzP Close #1 %rE:5) 9:DT+^BB Print "Finished merging RPC data for sample " & sampName 3jSt&+ Print "FRED formatted data file: " & Chr(9) & outFile JVfSmxy. End Sub S2y_5XJ<D B* 0TM+
'Utility function to read the contents of a file into an array of strings. p**Sd[| Function ReadFile(ByVal fileName As String, _ bsuGZ ByRef lineArray() As String) As Long 7:[u.cd (G1KMy ReadFile = -1 dC'8orFG+ Dim oFSO As Object EM2=g9y Set oFSO = CreateObject("Scripting.FileSystemObject") E?v9c>c Erase lineArray &`@S_YLr wh Hp}r Dim fid As Long 8dPDs#Zl If oFSO.fileexists( fileName ) Then ]|m?pt fid = FreeFile() 5#275Hyv Open fileName For Input As fid g=#Cc(
q lineArray = Split(Input(LOF(fid), fid), vbCrLf) DT;n)7+, Close fid k|hy_? * End If NL^;C3u Set oFSO = Nothing (YV]T!q Return UBound( lineArray )
Vs1H)T% hwx1 fpo4 End Function X%C`('"R plNoI1st Sub GetFileList( ByVal in_dir As String, _ et`1#_o ByRef in_flist() As String ) @23?II$=@ B~ ?R 6 'Redimension the file list array "]SA4Ud^ Erase in_flist $)YalZ SO|!x}GfI 'Tracks how many files are found q1^bH6*fl Dim fCount As Long tZXq<k9 fCount = 0 wC>}9OM p=XEMVqm 'Recurse directory and search for text files c9ye[81 Dim f As String _^Z
v[P f = Dir$(in_dir & "*.txt") QbJE+m5 While f <> "" xcQD]" ReDim Preserve in_flist(fCount) a
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S4S}go*G[ fCount += 1 49o /S2b4z f = Dir$() d53Eu`QW? Wend o[aP+O Md ReDim Preserve in_flist(fCount-1) $6l^::U M!`&Z9N End Sub SpO%nZ";g8