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摘要: \\\%pBT7]\ Knd2s~S 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。 (`z`ni y]dA<d?u 背景: D;~c`G
"f 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。 _*(n2'2B 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。 u ##.t 图1. RPC Photonics工程漫射体结构及光束投射形状 }Xn5M&>? 6gUcoDD irg%n 步骤 zkFx2(Hq-f '"#W!p 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。 EfTuHg$pe $Tc"7nYu 图2. RPC Photonics工程漫射体不同类型的散射数据 /wF*@ /PTH 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) Ucj
eB 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 =LP,+z 例如下所示: a@>P?N~LA9 Sample name: EDF-C1-56 *U[Nn5#? Merging data from file EDF-C1-56 0-0.txt P5vxQR_*lc Finished merging RPC data for sample EDF-C1-56 jHP6d = FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt zOV.cI6fZz 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 !N, Oe< a. 创建一个新的散射库 5Z2tTw'i b. 散射模型命名 ;@I4[4ph} c. 改变散射模型为“Tabulated BSDF”. I2U/\ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 9DAk|K e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 5*Wo/%#q f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, H<hFA(M g. 点击OK WH@CH4WM 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (T0%oina 9Z KB, KF'DOXBw> 脚本代码: H)eecH$K #&L[?jEn '#Language "WWB-COM" W,\LdQ Pz=x$aY Option Explicit O@[jNs)]. -d|Q|zF^x Sub Main G-54D_ 4 -F7GUB6B 'Cleanup %fv;C ClearOutputWindow() O.ce"5Y^ C(RZ09,.S Print "Merging RPC Photonics BSDF Data Files" @raw8w\Zj+ SetTextColor(255,0,0) st|;]q9? Print "Note: Script should be located in the same folder as the BSDF TXT files." |oYqkP| Print "Note: Do not run this script multiple times without deleting the output file between executions." e@Cv')]B SetTextColor(0,0,0) _8-iO.T+2 R:Pw@ 'Current directory of this script (should be the same as the text files being merged) LF2@qv w D Dim cDir As String k|Xxr cDir = MacroDir$ & "\" V>8)1)dF 51,RbADB 'Array which will be populated with the list of files to be merged -uE2h[X| Dim fList() As String, curFile As String __F?iRrCM GetFileList( cDir, fList ) 1$Jria5n X^2Txm d Print "" `oDs]90 Print "Files found for merging:" /b$0).fj@, For Each curFile In fList ~^6[SbVb Print Chr(9) & curFile R<5GG|(B Next hI&ugdf n$jOk
|W 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ]VYv>o`2 Dim nameArray() As String, sampName As String $p(,Qz(.8 nameArray = Split(fList(0)," 0-0.txt") }I1A4=d sampName = nameArray(0) >z(AQ Print "" )]\?Yyg] Print "Sample name: " & Chr(9) & sampName 5|4=uoA< # 1S*}Q<k 'Open an output file and write the FRED header data c*5y8k Dim outFile As String >.tP7= outFile = cDir & sampName & "_FRED.txt" POnI&y] Open outFile For Output As #1 lbRm(W( Print #1, "type bsdf_data" C4#E N} Print #1, "format angles=deg bsdf=value scale=1" y .+d3 9PU9BYBG 'Loop the file list, skip the two header lines and write the remaining data to file shjq4#9 Dim lineArray() As String, curLine As Long Mp8FYPjZ For Each curFile In fList qWQ7:*DL Print "Merging data from file " & curFile i8]2y ReadFile( cDir & curFile, lineArray ) dzK]F/L] For curLine = 2 To UBound(lineArray) mt0ZD}E Print #1, lineArray(curLine) .U66Uet>RX Next d )}@0Q Next AK#`&)0i isdEs k#A. 'Close the output file bZ/4O*B Close #1 RpAtd^I EB/.M+~a Print "Finished merging RPC data for sample " & sampName qtx5N)J6 Print "FRED formatted data file: " & Chr(9) & outFile z%F68f73 End Sub uSAb #ny&bJj 'Utility function to read the contents of a file into an array of strings. M"E ]r=1 Function ReadFile(ByVal fileName As String, _ R^fk :3 ByRef lineArray() As String) As Long C:]&V*d.v4 :HJ@/s!J ReadFile = -1 5M.KF;P Dim oFSO As Object |bHId!d Set oFSO = CreateObject("Scripting.FileSystemObject") cY}Nr#%s@U Erase lineArray aCL_cVOMR 208 dr*6U Dim fid As Long 7\BGeI If oFSO.fileexists( fileName ) Then ]^='aQ fid = FreeFile() ~-"<)XPe Open fileName For Input As fid AYC22( lineArray = Split(Input(LOF(fid), fid), vbCrLf) Kg#5
@; Close fid c{iF End If 64#6L.Q-c Set oFSO = Nothing WIe2j Return UBound( lineArray ) "S">#.L ZQd\!K8y^Q End Function )u. ut8![T `7;I*| Sub GetFileList( ByVal in_dir As String, _ *-!&5~o/U ByRef in_flist() As String ) \2rCT~x :&]THUw 'Redimension the file list array 8gA:s`ofJ Erase in_flist oEqt7l[I{ "hwG"3n1 'Tracks how many files are found )N) "O? W9 Dim fCount As Long ]t69a4&,#9 fCount = 0 >3S^9{d =5JTVF 'Recurse directory and search for text files ++s=$D Dim f As String 7VP[U, f = Dir$(in_dir & "*.txt") )xJo/{? While f <> "" 'qosw:P ReDim Preserve in_flist(fCount) SI:+I4i in_flist(fCount) = f D@Zb|EI%< fCount += 1 EW* 's( f = Dir$() OVsZUmSG Wend va(ZGGS]N ReDim Preserve in_flist(fCount-1) iU5Aj:U3 ; r SpM End Sub pg}9baW? :v_H;UU 6J|Ee1Ez QQ:2987619807 MDfE(cn2q
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