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摘要: LRL,m_gt {*G9|#[/@ 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。 h`^jyoF"( QIG$z?
背景: T&6l$1J Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 H?yK~bGQ FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 %)1y AdG
8 图1. RPC Photonics工程漫射体结构及光束投射形状 ~%<X0s| i@*{27t G<65H+)M\ 步骤 (A9Fhun | )K8N<n 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 xF!,IKlBBp LBYMCY 图2. RPC Photonics工程漫射体不同类型的散射数据 +r2+X:#~T 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) f6hnTbJ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 d,k!qjf=r 例如下所示: (ZUHvvL Sample name: EDF-C1-56 lXW%FH6c+ Merging data from file EDF-C1-56 0-0.txt NG+GEqx Finished merging RPC data for sample EDF-C1-56 ]L5@,E4. FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt y%"{I7!A 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 11Q1AN a. 创建一个新的散射库 SW@$ci b. 散射模型命名 (KjoSN(
K c. 改变散射模型为“Tabulated BSDF”. xQ7l~O
b 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 ) n(1l}TJy 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。 luh$2 \5B f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, G#ZH.24Y g. 点击OK #NEE7'&S 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "q3ZWNS'w
dm\F ha]VWt%} 脚本代码: zu_8># i- o_izl\ '#Language "WWB-COM" Ri<u/ ]oR" I fK,b*% Option Explicit ejSji-Qd |mZxfI Sub Main I ce~oz) NVkV7y X] 'Cleanup .]8ZwAs=& ClearOutputWindow() zfJT,h-{ z O-z%y Print "Merging RPC Photonics BSDF Data Files" /CrSu SetTextColor(255,0,0) qqjwJ!@P Print "Note: Script should be located in the same folder as the BSDF TXT files." is?{MJZ_ Print "Note: Do not run this script multiple times without deleting the output file between executions." ?g_3 [Fk SetTextColor(0,0,0) OIGY` .73X3`P25 'Current directory of this script (should be the same as the text files being merged) G<L;4nA) Dim cDir As String HY56"LZ$(} cDir = MacroDir$ & "\" E^B'4 ?qb}?&1 'Array which will be populated with the list of files to be merged g@d*\ P) Dim fList() As String, curFile As String Yj&F;_~ GetFileList( cDir, fList ) u+9hL4 )HEa<P^kJl Print "" .yoH/2h Print "Files found for merging:" Akq2 d; For Each curFile In fList )*u8/U Print Chr(9) & curFile 1.}d.t
Next {a =#B)6 mVj9 ,q0 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. s
n8Qk=K Dim nameArray() As String, sampName As String &)QX7*H nameArray = Split(fList(0)," 0-0.txt") em y[k sampName = nameArray(0) ))qy;Q, Print "" esJ~;~[@(r Print "Sample name: " & Chr(9) & sampName l|u>Tb|V })'B<vq 'Open an output file and write the FRED header data b!+hH Hv: Dim outFile As String Z3Og=XHR outFile = cDir & sampName & "_FRED.txt" 0-B5`=yU Open outFile For Output As #1 d9k0F
OR1 Print #1, "type bsdf_data" ><4<yj1 Print #1, "format angles=deg bsdf=value scale=1" lqy Qf$t N"Z{5A 'Loop the file list, skip the two header lines and write the remaining data to file ,<.V7(|t) Dim lineArray() As String, curLine As Long @="Pn5<]C For Each curFile In fList
,>:U2% Print "Merging data from file " & curFile |NlO7aQ>2H ReadFile( cDir & curFile, lineArray ) :@yEQ#nFp For curLine = 2 To UBound(lineArray) [|v][Hwv Print #1, lineArray(curLine) (|2t#'m Next kj Jn2c:y Next QL(n} {.% pd?Mf=># 'Close the output file gM&{=WDG6 Close #1 Usvl}{L[ :'Vf
g[Uq Print "Finished merging RPC data for sample " & sampName T9=I$@/ Print "FRED formatted data file: " & Chr(9) & outFile <NMEGit End Sub #`^}PuQ 5=-Q4d 'Utility function to read the contents of a file into an array of strings. MxKS4k Function ReadFile(ByVal fileName As String, _ "MeVE#O ByRef lineArray() As String) As Long `>o{P/HN 8|gIhpO?^ ReadFile = -1 9+|$$) Dim oFSO As Object U4'#T%* Set oFSO = CreateObject("Scripting.FileSystemObject") $t+,Tav Erase lineArray ~g91Pr XPc^Tq Dim fid As Long #mxPw If oFSO.fileexists( fileName ) Then cZ,b?I"Q% fid = FreeFile() !|(-=2` Open fileName For Input As fid ROI7eU lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2Ah#<k-gC; Close fid &C_j\7Dq End If g _9C* Set oFSO = Nothing AI2)g1m Return UBound( lineArray ) hPB9@hT$ rI{; I DV End Function hPkp;a # "nynl'Ryk Sub GetFileList( ByVal in_dir As String, _ M/f<A$xx_ ByRef in_flist() As String ) E_rI?t^ #^0R&) T 'Redimension the file list array q1x`Bj Erase in_flist zpn9,,~u 7sCG^&Y 'Tracks how many files are found h,:m~0gmj Dim fCount As Long LBeF&sb6 fCount = 0 |d2SIyUc P}}* Q7P 'Recurse directory and search for text files (XTG8W sN Dim f As String
>Er|Jxy f = Dir$(in_dir & "*.txt") ;?Tbnn Wn While f <> ""
z_$% -6 ReDim Preserve in_flist(fCount) |l^uEtG in_flist(fCount) = f ,_ H:J.ik fCount += 1 :LQYo'@yB f = Dir$() {lzWrUGO Wend EU 6 oQ ReDim Preserve in_flist(fCount-1) Wtd/=gmiI &&8x%Pml End Sub Pbn*_/H +.PxzL3? d'gfQlDny QQ:2987619807 HVCe;eI
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