CalWire_module.cc

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////////////////////////////////////////////////////////////////////////
//
// CalWire class
//
// brebel@fnal.gov
//
////////////////////////////////////////////////////////////////////////

// ROOT includes
#include <TFile.h>
#include <TH2D.h>
#include <TH1D.h>
#include <TF1.h>
#include <TComplex.h>

// Framework includes
#include "fhiclcpp/ParameterSet.h"
#include "messagefacility/MessageLogger/MessageLogger.h"
#include "cetlib_except/exception.h"
#include "cetlib/search_path.h"
#include "canvas/Persistency/Common/Ptr.h"
#include "canvas/Persistency/Common/Assns.h"
#include "art/Framework/Principal/Event.h"
#include "art/Framework/Principal/Handle.h"
#include "art/Framework/Services/Registry/ServiceHandle.h"
#include "art/Framework/Core/EDProducer.h" // include the proper bit of the framework
#include "art/Framework/Core/ModuleMacros.h"

// LArSoft includes
#include "larcoreobj/SimpleTypesAndConstants/RawTypes.h" // raw::ChannelID_t
#include "larcore/Geometry/Geometry.h"
#include "lardataobj/RawData/RawDigit.h"
#include "lardataobj/RawData/raw.h"
#include "lardataobj/RecoBase/Wire.h"
#include "lardata/ArtDataHelper/WireCreator.h"
#include "lardata/Utilities/LArFFT.h"
#include "lardata/Utilities/AssociationUtil.h"

///creation of calibrated signals on wires
namespace caldata {

  class CalWire : public art::EDProducer {

  public:

    // create calibrated signals on wires. this class runs
    // an fft to remove the electronics shaping.
    explicit CalWire(fhicl::ParameterSet const& pset);

    void produce(art::Event& evt);
    void beginJob();

  private:

    std::string  fResponseFile;      ///< response file containing transformed
                                     ///< shape histograms and decay constants
    // for c2: fDataSize is not used
    // int          fDataSize;          ///< size of raw data on one wire
    int          fExpEndBins;        ///< number of end bins to consider for tail fit
    int          fPostsample;        ///< number of postsample bins
    std::string  fDigitModuleLabel;  ///< module that made digits

    std::vector<std::vector<TComplex> > fKernelR;      ///< holds transformed induction
                                                       ///< response function
    std::vector<std::vector<TComplex> > fKernelS;      ///< holds transformed induction
                                                       ///< response function
    std::vector<double>                 fDecayConstsR; ///< vector holding RC decay
                                                       ///< constants
    std::vector<double>                 fDecayConstsS; ///< vector holding RC decay
                                                       ///< constants
    std::vector<int>                    fKernMapR;     ///< map telling which channels
                                                       ///< have which response functions
    std::vector<int>                    fKernMapS;     ///< map telling which channels
                                                       ///< have which response functions
  protected:

  }; // class CalWire
}

namespace caldata{

  //-------------------------------------------------
  CalWire::CalWire(fhicl::ParameterSet const& pset)
    : EDProducer{pset}
  {
    fDigitModuleLabel = pset.get< std::string >("DigitModuleLabel", "daq");
    cet::search_path sp("FW_SEARCH_PATH");
    sp.find_file(pset.get<std::string>("ResponseFile"), fResponseFile);
    fExpEndBins       = pset.get< int >        ("ExponentialEndBins");
    fPostsample       = pset.get< int >        ("PostsampleBins");

    produces< std::vector<recob::Wire> >();
    produces<art::Assns<raw::RawDigit, recob::Wire>>();

  }

  //-------------------------------------------------
  void CalWire::beginJob()
  {

    MF_LOG_DEBUG("CalWire") << "CalWire_plugin: Opening  Electronics Response File: "
                         << fResponseFile.c_str();

    TFile f(fResponseFile.c_str());
    if( f.IsZombie() )
      mf::LogWarning("CalWire") << "Cannot open response file "
                                << fResponseFile.c_str();

    TH2D *respRe       = dynamic_cast<TH2D*>(f.Get("real/RespRe")   );
    TH2D *respIm       = dynamic_cast<TH2D*>(f.Get("real/RespIm")   );
    TH1D *decayHist    = dynamic_cast<TH1D*>(f.Get("real/decayHist"));
    unsigned int wires = decayHist->GetNbinsX();
    unsigned int bins  = respRe->GetYaxis()->GetNbins();
    unsigned int bin   = 0;
    unsigned int wire  = 0;
    fDecayConstsR.resize(wires);
    fKernMapR.resize(wires);
    fKernelR.resize(respRe->GetXaxis()->GetNbins());
    const TArrayD *edges = respRe->GetXaxis()->GetXbins();
    for(int i = 0; i < respRe->GetXaxis()->GetNbins(); ++i)  {
      fKernelR[i].resize(bins);
      for(bin = 0; bin < bins; ++bin) {

        const TComplex a(respRe->GetBinContent(i+1,bin+1),
                         respIm->GetBinContent(i+1,bin+1));
        fKernelR[i][bin]=a;
      }
      for(; wire < (*edges)[i+1]; ++wire) {
        fKernMapR[wire]=i;
        fDecayConstsR[wire]=decayHist->GetBinContent(wire+1);
      }
    }
    respRe       = dynamic_cast<TH2D*>(f.Get("sim/RespRe")   );
    respIm       = dynamic_cast<TH2D*>(f.Get("sim/RespIm")   );
    decayHist    = dynamic_cast<TH1D*>(f.Get("sim/decayHist"));
    wires = decayHist->GetNbinsX();
    bins  = respRe->GetYaxis()->GetNbins();
    fDecayConstsS.resize(wires);
    fKernMapS.resize(wires);
    fKernelS.resize(respRe->GetXaxis()->GetNbins());
    const TArrayD *edges1 = respRe->GetXaxis()->GetXbins();
    wire =0;
    for(int i = 0; i < respRe->GetXaxis()->GetNbins(); ++i)  {
      fKernelS[i].resize(bins);
      for(bin = 0; bin < bins; ++bin) {
        const TComplex b(respRe->GetBinContent(i+1,bin+1),
                         respIm->GetBinContent(i+1,bin+1));
        fKernelS[i][bin]=b;
      }
      for(; wire < (*edges1)[i+1]; ++wire) {
        fKernMapS[wire]=i;
        fDecayConstsS[wire]=decayHist->GetBinContent(wire+1);
      }
    }

    f.Close();
  }

  //////////////////////////////////////////////////////
  void CalWire::produce(art::Event& evt)
  {


    // get the geometry
    art::ServiceHandle<geo::Geometry const> geom;

    std::vector<double> decayConsts;
    std::vector<int> kernMap;
    std::vector<std::vector<TComplex> > kernel;
    //Put correct response functions and decay constants in place
    if(evt.isRealData()) {
      decayConsts=fDecayConstsR;
      kernMap=fKernMapR;
      kernel=fKernelR;
    }
    else {
      decayConsts=fDecayConstsS;
      kernMap=fKernMapS;
      kernel=fKernelS;
    }

    // get the FFT service to have access to the FFT size
    art::ServiceHandle<util::LArFFT> fFFT;

    // make a collection of Wires
    std::unique_ptr<std::vector<recob::Wire> > wirecol(new std::vector<recob::Wire>);
    // ... and an association set
    std::unique_ptr<art::Assns<raw::RawDigit,recob::Wire> > WireDigitAssn
      (new art::Assns<raw::RawDigit,recob::Wire>);

    // Read in the digit List object(s).
    art::Handle< std::vector<raw::RawDigit> > digitVecHandle;
    evt.getByLabel(fDigitModuleLabel, digitVecHandle);

    if (!digitVecHandle->size())  return;
    mf::LogInfo("CalWire") << "CalWire:: digitVecHandle size is " << digitVecHandle->size();

    // Use the handle to get a particular (0th) element of collection.
    art::Ptr<raw::RawDigit> digitVec0(digitVecHandle, 0);

    unsigned int dataSize = digitVec0->Samples(); //size of raw data vectors

    int transformSize = fFFT->FFTSize();
    raw::ChannelID_t channel(raw::InvalidChannelID); // channel number
    unsigned int bin(0);     // time bin loop variable

    double decayConst = 0.;  // exponential decay constant of electronics shaping
    double fitAmplitude    = 0.;  //This is the seed value for the amplitude in the exponential tail fit
    std::vector<float> holder;                // holds signal data
    std::vector<short> rawadc(transformSize);  // vector holding uncompressed adc values
    std::vector<TComplex> freqHolder(transformSize+1); // temporary frequency data

    // loop over all wires
    for(unsigned int rdIter = 0; rdIter < digitVecHandle->size(); ++rdIter){ // ++ move
      holder.clear();

      art::Ptr<raw::RawDigit> digitVec(digitVecHandle, rdIter);
      channel = digitVec->Channel();

      holder.resize(transformSize);

      // uncompress the data
      raw::Uncompress(digitVec->ADCs(), rawadc, digitVec->Compression());

      for(bin = 0; bin < dataSize; ++bin)
        holder[bin]=(rawadc[bin]-digitVec->GetPedestal());
      // fExpEndBins only nonzero for detectors needing exponential tail fitting
      if(fExpEndBins && std::abs(decayConsts[channel]) > 0.0){

        TH1D expTailData("expTailData","Tail data for fit",
                         fExpEndBins,dataSize-fExpEndBins,dataSize);
        TF1  expFit("expFit","[0]*exp([1]*x)");

        for(bin = 0; bin < (unsigned int)fExpEndBins; ++bin)
          expTailData.Fill(dataSize-fExpEndBins+bin,holder[dataSize-fExpEndBins+bin]);
        decayConst = decayConsts[channel];
        fitAmplitude = holder[dataSize-fExpEndBins]/exp(decayConst*(dataSize-fExpEndBins));
        expFit.FixParameter(1,decayConst);
        expFit.SetParameter(0,fitAmplitude);
        expTailData.Fit(&expFit,"QWN","",dataSize-fExpEndBins,dataSize);
        expFit.SetRange(dataSize,transformSize);
        for(bin = 0; bin < dataSize; ++bin)
          holder[dataSize+bin]= expFit.Eval(bin+dataSize);
      }
      // This is actually deconvolution, by way of convolution with the inverted
      // kernel.  This code assumes the response function has already been
      // been transformed and inverted.  This way a complex multiplication, rather
      // than a complex division is performed saving 2 multiplications and
      // 2 divsions

      // the example below is for MicroBooNE, experiments should
      // adapt as appropriate

      // Figure out which kernel to use (0=induction, 1=collection).
      geo::SigType_t sigtype = geom->SignalType(channel);
      size_t k;
      if(sigtype == geo::kInduction)
        k = 0;
      else if(sigtype == geo::kCollection)
        k = 1;
      else
        throw cet::exception("CalWire") << "Bad signal type = " << sigtype << "\n";
      if (k >= kernel.size())
        throw cet::exception("CalWire") << "kernel size < " << k << "!\n";

      fFFT->Convolute(holder,kernel[k]);

      holder.resize(dataSize,1e-5);
      //This restores the DC component to signal removed by the deconvolution.
      if(fPostsample) {
        double average=0.0;
        for(bin=0; bin < (unsigned int)fPostsample; ++bin)
          average+=holder[holder.size()-1-bin]/(double)fPostsample;
        for(bin = 0; bin < holder.size(); ++bin) holder[bin]-=average;
      }
      wirecol->push_back(recob::WireCreator(holder,*digitVec).move());
      // add an association between the last object in wirecol
      // (that we just inserted) and digitVec
      if (!util::CreateAssn(*this, evt, *wirecol, digitVec, *WireDigitAssn)) {
        throw art::Exception(art::errors::ProductRegistrationFailure)
          << "Can't associate wire #" << (wirecol->size() - 1)
          << " with raw digit #" << digitVec.key();
      } // if failed to add association
    } // for raw digits

    if(wirecol->size() == 0)
      mf::LogWarning("CalWire") << "No wires made for this event.";

    evt.put(std::move(wirecol));
    evt.put(std::move(WireDigitAssn));

    return;
  }

} // end namespace caldata


namespace caldata{

  DEFINE_ART_MODULE(CalWire)

} // end namespace caldata