92 lines
4.1 KiB
C++
92 lines
4.1 KiB
C++
/***************************************************************************
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PFourier.h
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Author: Andreas Suter
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e-mail: andreas.suter@psi.ch
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***************************************************************************/
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/***************************************************************************
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* Copyright (C) 2007-2015 by Andreas Suter *
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* andreas.suter@psi.ch *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#ifndef _PFOURIER_H_
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#define _PFOURIER_H_
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#include "fftw3.h"
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#include "PMusr.h"
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#define F_APODIZATION_NONE 1
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#define F_APODIZATION_WEAK 2
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#define F_APODIZATION_MEDIUM 3
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#define F_APODIZATION_STRONG 4
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/**
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* muSR Fourier class.
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*/
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class PFourier
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{
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public:
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PFourier(TH1F *data, Int_t unitTag,
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Double_t startTime = 0.0, Double_t endTime = 0.0,
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Bool_t dcCorrected = false, UInt_t zeroPaddingPower = 0);
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virtual ~PFourier();
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virtual void Transform(UInt_t apodizationTag = 0);
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virtual const char* GetDataTitle() { return fData->GetTitle(); }
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virtual const Int_t GetUnitTag() { return fUnitTag; }
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virtual Double_t GetResolution() { return fResolution; }
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virtual Double_t GetMaxFreq();
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virtual TH1F* GetRealFourier(const Double_t scale = 1.0);
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virtual TH1F* GetImaginaryFourier(const Double_t scale = 1.0);
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virtual TH1F* GetPowerFourier(const Double_t scale = 1.0);
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virtual TH1F* GetPhaseFourier(const Double_t scale = 1.0);
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virtual Bool_t IsValid() { return fValid; }
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private:
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TH1F *fData; ///< data histogram to be Fourier transformed.
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Bool_t fValid; ///< true = all boundary conditions fullfilled and hence a Fourier transform can be performed.
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Int_t fUnitTag; ///< 1=Field Units (G), 2=Field Units (T), 3=Frequency Units (MHz), 4=Angular Frequency Units (Mc/s)
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Int_t fApodization; ///< 0=none, 1=weak, 2=medium, 3=strong
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Double_t fTimeResolution; ///< time resolution of the data histogram in (us)
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Double_t fStartTime; ///< start time of the data histogram
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Double_t fEndTime; ///< end time of the data histogram
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Bool_t fDCCorrected; ///< if true, removed DC offset from signal before Fourier transformation, otherwise not
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UInt_t fZeroPaddingPower; ///< power for zero padding, if set < 0 no zero padding will be done
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Double_t fResolution; ///< Fourier resolution (field, frequency, or angular frequency)
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UInt_t fNoOfData; ///< number of bins in the time interval between fStartTime and fStopTime
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UInt_t fNoOfBins; ///< number of bins to be Fourier transformed. Might be different to fNoOfData due to zero padding
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fftw_plan fFFTwPlan; ///< fftw plan (see FFTW3 User Manual)
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fftw_complex *fIn; ///< real part of the Fourier transform
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fftw_complex *fOut; ///< imaginary part of the Fourier transform
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virtual void PrepareFFTwInputData(UInt_t apodizationTag);
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virtual void ApodizeData(Int_t apodizationTag);
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};
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#endif // _PFOURIER_H_
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