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- /* This file is part of Lemma, a geophysical modelling and inversion API.
- * More information is available at http://lemmasoftware.org
- */
-
- /* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- */
-
- /**
- * @file
- * @date 11/11/2016 02:44:37 PM
- * @version $Id$
- * @author Trevor Irons (ti)
- * @email tirons@egi.utah.edu
- * @copyright Copyright (c) 2016, University of Utah
- * @copyright Copyright (c) 2016, Lemma Software, LLC
- */
-
- #include <Merlin>
- using namespace Lemma;
-
- static constexpr Real GAMMA = 2.67518e8; // MKS units
-
- std::shared_ptr<PolygonalWireAntenna> CircularLoop ( int nd, Real radius, Real Offsetx, Real Offsety, Real wL ) ;
- void MoveLoop( std::shared_ptr<PolygonalWireAntenna> Loop, int nd, Real Radius, Real Offsetx, Real Offsety, Real wL );
-
- int main(int argc, char** argv) {
- /*
- if ( argc < 2 ) {
- std::cout << "Calculates the coupling between two sNMR loops at the Larmor frequency. Usage\n"
- << "\t./Coupling EarthModel.yaml" << std::endl;
- exit(0);
- }
- //Real offset = atof(argv[1]);
- auto earth = LayeredEarthEM::DeSerialize( YAML::LoadFile(argv[1]) );
- */
- // RedButtes model, also how you can generate your own files
- auto earth = LayeredEarthEM::NewSP();
- earth->SetNumberOfLayers(3);
- //earth->SetLayerConductivity( (VectorXcr(3) << Complex(0.,0), Complex(1./50.,0), Complex(1./100.)).finished() );
- earth->SetLayerConductivity( (VectorXcr(3) << Complex(0.,0), Complex(1./7.,0), Complex(1./100.)).finished() );
- earth->SetLayerThickness( (VectorXr(1) << 10).finished() );
- // Set mag field info
- // From NOAA, Laramie WY, June 9 2016, aligned with mag. north
- earth->SetMagneticFieldIncDecMag( 67, 0, 52750, NANOTESLA );
- // auto sig = std::ofstream("SigmaModel.yaml");
- // sig << *earth << std::endl;
- // sig.close();
-
- Real Larmor = earth->GetMagneticFieldMagnitude()*GAMMA/(2*PI);
-
- // Transmitter loops
- auto Tx1 = CircularLoop(21, 15, 50, 50, Larmor);
- auto Tx2 = CircularLoop(21, 15, 50, 50, Larmor); // initially coincident
-
- auto Kern = Coupling::NewSP();
- Kern->PushCoil( "Coil 1", Tx1 );
- Kern->PushCoil( "Coil 2", Tx2 );
- Kern->SetLayeredEarthEM( earth );
-
- Kern->SetIntegrationSize( (Vector3r() << 50,100,20).finished() );
- Kern->SetIntegrationOrigin( (Vector3r() << 0,0,0.01).finished() );
- Kern->SetTolerance( 1e-12 ); // 1e-12
-
- std::vector<std::string> tx = {std::string("Coil 1")};//,std::string("Coil 2")};
- std::vector<std::string> rx = {std::string("Coil 2")};
- VectorXr Offsets = VectorXr::LinSpaced(6, 15.00, 23.0); // nbins, low, high
-
- auto outfile = std::ofstream("coupling.dat");
- for (int ii=0; ii< Offsets.size(); ++ii) {
- MoveLoop(Tx2, 21, 15, 50, 50 + Offsets(ii), Larmor);
- #ifdef LEMMAUSEVTK
- Complex coupling = Kern->Calculate( tx, rx, true );
- #else
- Complex coupling = Kern->Calculate( tx, rx, false );
- #endif
- std::cout << "coupling " << coupling << std::endl;
- outfile << Offsets(ii) << "\t" << std::real(coupling) << "\t" << std::imag(coupling) << std::endl;
- }
- outfile.close();
- }
-
- std::shared_ptr<Lemma::PolygonalWireAntenna> CircularLoop ( int nd, Real Radius, Real Offsetx, Real Offsety, Real wL ) {
-
- auto Tx1 = Lemma::PolygonalWireAntenna::NewSP();
- Tx1->SetNumberOfPoints(nd);
-
- VectorXr range = VectorXr::LinSpaced(nd, 0, 2*PI);
- int ii;
- for (ii=0; ii<nd; ++ii) {
- Tx1->SetPoint(ii, Vector3r(Offsetx+Radius*std::cos(range(ii)), Offsety+Radius*std::sin(range(ii)), -1e-3));
- }
-
- Tx1->SetCurrent(1.);
- Tx1->SetNumberOfTurns(1);
- Tx1->SetNumberOfFrequencies(1);
- Tx1->SetFrequency(0,wL);
-
- return Tx1;
- }
-
- void MoveLoop( std::shared_ptr<Lemma::PolygonalWireAntenna> Tx1, int nd, Real Radius, Real Offsetx, Real Offsety, Real wL ) {
-
- Tx1->SetNumberOfPoints(nd);
-
- VectorXr range = VectorXr::LinSpaced(nd, 0, 2*PI);
- int ii;
- for (ii=0; ii<nd; ++ii) {
- Tx1->SetPoint(ii, Vector3r(Offsetx+Radius*std::cos(range(ii)), Offsety+Radius*std::sin(range(ii)), -1e-3));
- }
-
- Tx1->SetCurrent(1.);
- Tx1->SetNumberOfTurns(1);
- Tx1->SetNumberOfFrequencies(1);
- Tx1->SetFrequency(0,wL);
-
- }
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