Kaëlig CASTOR

Senior Research Scientist
Acoustics/Signal Processing/Mechanics

Research Interests :
- Signal processing in seismic imaging and ocean acoustics
-
Acoustic noise cancellation
- Acoustic source deblending, machine learning
- 3-D acoustic propagation in an ocean waveguide
- nonlinear acoustics
- long-range acoustic wave propagation in the ocean (seismo-acoustic conversion, hydroacoustic monitoring) and in the atmosphere (infrasound monitoring)
- ionic transduction (plasma loudspeakers)
- acoustic propagation in multi-scale waveguides (self-similar structure)

International Mobility

Date / Place of birth:
November 27th 1974 / Provins, France
Citizenship: French
Family Status : Single

Address:
130 Rue Saint Maur, Bat. D, 1er etg.
75011 PARIS, FRANCE

Cell: (+33) 6 63 22 41 95
(+33) 6 87 68 91 46

Email:





Degrees
2003
PostDoc, Marine Physical Laboratory, Scripps Institution of Oceanography, University of California San Diego, USA
2001
PhD in Acoustics, LAUM, University of Le Mans, France
1997
DEA d'Acoustique Appliquée, University of Le Mans, France
1996
Maîtrise de Physique et Applications, University of Paris XI-Orsay, France


Professional Experience
2007-present

Senior Research Scientist
Land Data Acquisition Business Line, Research Department, Compagnie Generale de Geophysique
CGG, Massy, FRANCE

Research Subject : Broadband Vibroseis Source
Keywords :

- Software development called EmphaSeisTM that designs optimized source signal while accounting for vibrator limitations.
-
Embedded systems in vibroseismic acquisition crews for earth subsurface imaging.
- Drastic improvement in the fidelity and consistency of the acoustic source (noise cancellation).

Award/Distinction :

1st price in Technological Innovation CGG 2015 " Above and beyond " for a method called CleanSweepTM that lowers significantly the harmonic noise in the vibroseismic source. It rewards the successful accomplishment in the project initialization, development, industrialization, and commercialization.

Collaboration :

John Sallas

> details

Research Subject : Simultaneous Source Acquisition and Deblending
Keywords :

- New source encoding method based on instantaneous frequency modulation.
-
Signal processing on extensive field datasets.

Collaboration :

John Sallas



Operational Duties : Operational and technical supervision of crew startups and large-scale field tests for numerous major oil companies (Saudi Aramco, Qatar Petroleum, Shell, Total, ENI, Repsol, Apache, Khalda, PDO, Sonatrach, OMV).
2004-2006

 Research Engineer
Département Analyse Surveillance Environnement, Commissariat à l'Energie Atomique
DASE, CEA, Bruyères-le-Châtel, FRANCE
Subject : 3D acoustic propagation modeling in a realistic oceanic environment using a parallel parabolic algorithm
Keywords : 3D Wide Angle Parabolic Equation (3DWAPE), numerical simulations, hydroacoustics, horizontal refraction, global oceanographic data base, International Monitoring System, multiprocessing computation, MPI.
Collaborations : Frédéric Sturm, MdC, LMFA, Ecole Centrale de Lyon
> details

Subject : Nonlinear acoustic propagation in the atmosphere
Keywords : Nonlinear Progressive wave Equation (NPE), numerical simulations, infrasounds, shock wave, long-range propagation.
Collaborations :

The MOPA workshop (Modélisation de la Propagation Acoustique) includes CEA, LMFA from Ecole Centrale de Lyon, and LMM from University of Paris 6. (Régis Marchiano, MdC, LMM, Univ. Paris 6)

> some examples of outdoor propagation simulations
2001-2003

PostDoc
Marine Physical Laboratory, Scripps Institution of Oceanography, University of California, San Diego
MPL, SIO, UCSD, La Jolla, USA
Subject : Nonlinear acoustic propagation in an ocean waveguide
Keywords :
Nonlinear Progressive wave Equation (NPE), numerical simulations, shock wave, long-range propagation, parametric interaction, harmonics, modes dispersion.
Supervised by :
Collaborations :

B. Ed. McDonald, US Naval Research Laboratory, Office Naval Research, Washington DC, USA

> some examples of nonlinear acoustic propagation in an ocean waveguide
1997-2001

PhD in Acoustics
Laboratoire d'Acoustique de l'Université du Maine
LAUM, Le Mans, France

Subject : Characterization of acoustic sources associated with negatives corona discharges
Keywords : Acoustics, loudspeaker, electroacoustics, corona discharges, ionised gas, acoustic and electric models, acoustic and electric measurements, electroacoustic efficiency, parametric study, harmonic distorsion, electric interactions, acoustics with flow.
Supervised by : Philippe Béquin and Michel Bruneau.
> details

1997

(4 month)  

Research project

Laboratoire Ondes et Acoustique de l'Ecole Supérieure de Physique et de Chimie Industrielles de Paris
LOA, ESPCI, Paris, France
Subject : Propagation of acoustic waves into multi-scales middles - modelisation, simulations and experimental validations
Keywords : Acoustical propagation, waveguide, fractal structure, impedance, acoustic filter, random structure.
Supervised by : Vincent Gibiat.
> details

1996

(3 month) 

Research project

Laboratoire d'Acoustique du Conservatoire National des Arts et Métiers, Paris
Acoustics Lab., CNAM, Paris

Subject : Suspension modeling for a microphone used in movie sound recording
Keywords : Vibrations, Lagrangian formalism, solidian transmission, numerical simulations, transmissibility measurements
Supervised by : Alexandre Garcia and Philippe Chenevez.
> details

1995

(1 month) 

Research project

Laboratoire de Physique des Hautes Energies à l'Ecole Polytechnique
LPNHE-X, Palaiseau, FRANCE
Subject : Antimatter detection in telescopic mesurements of cosmic radiations
Keywords : Cosmic radiations, Cerenkov effect, particle detection.
Supervised by : Marcel Urban.
> details

 

Patents

Sallas J., Castor K., paper
  Seismic Source and Method for Intermodulation Mitigation,
US 20140114578 (16.10.2013).
   
Castor K., Bianchi T., Sallas J., paper
  Instantaneous Frequency Modulation Acquisition Scheme for Seismic Sources,
WO 2014/207074 A1 (27.06.2013).
   
Castor K., Winter O., Bianchi T., Klein T., paper
  Systems and methods for reducing noise in a seismic vibratory source,
US WO/2015/097557 (02.07.2015).

 

Publications in International Peer-Reviewed Journals

Gibiat V., Barjau A., Castor K., Bertaud du Chazaud E., paper
  Acoustical propagation in a prefractal wave-guide,
Physical Review E, vol. 67, 066609 (2003).
   
Bequin Ph., Castor K., Scholten J., paper
  Electric wind characterisation in negative point-to-plane corona discharges in air,
Eur. Phys. J. - AP 22, 41-49 (2003).
   
Castor K., Gerstoft P., Roux Ph., McDonald B. E., Kuperman W. A., paper
  Long Range Propagation of Finite Amplitude Acoustic Waves in an Ocean Waveguide,
J. Acoust. Soc. Am., vol. 116, pp. 2004-2010 (2004).
   
Béquin Ph., Castor K., Herzog Ph., Montembault V., paper
  Modeling of Plasma Loudspeakers,
J. Acoust. Soc. Am., vol. 121, pp. 1960-1970 (2007).
   
Castor K., Sturm F., paper
  Investigation of 3-D acoustical effets using a multiprocessing parabolic equation based algorithm,
J. Comp. Acoust., vol. 16, pp. 137-162 (2008).

 

Conferences with Proceedings

Castor K., Béquin Ph., paper
  Rendement d'un haut-parleur à décharges corona négatives,
  Congrès Français d'Acoustique, Lausanne, Switzerland, september 2000.
   
Castor K., Béquin Ph., paper abstract
  Acoustical behaviour of the negative point-to-plane corona discharges,
  17th International Congress on Acoustics, Rome, Italy, september 2001.
   
Castor K., McDonald B. E., Kuperman W. A.,
  Equations of nonlinear acoustics and weak shock propagation,
  16th International Symposium on Nonlinear Acoustics, Moscow, Russia, august 2002.
   
Castor K., Gerstoft P., Kuperman W. A., McDonald B. E., Gerald L. D'Spain, paper poster
  Nonlinear effects in long range propagation,
  24th Seismic Research Review, Jacksonville, USA, september 2002.
   
Castor K., Sturm F., Piserchia P. F., paper
  Analysis of 3-D Acoustical Effects in a Realistic Oceanic Environment,
  Underwater Acoustic Measurements: Technologies and Results Int. Conf., Heraklion, Crete, Greece, june 2005.
   
Bequin Ph., Castor K., paper abstract
  Etude du comportement non linéaire d'un haut-parleur à gaz ionisé,
  8ème Congrès Français d'Acoustique, Tours, France, april 24-27 2006.
   
Castor K., Bianchi T., Winter O., Klein T. paper talk
  Noise Reduction in VibroSeis source,
  84th SEG Annual Meeting, Denver, USA, October 2014.
   
Castor K., Bianchi T., Winter O., Klein T. paper talk
  Efficient Harmonic-Distortion Mitigation on Vibro-Seismic Sources,
  EAGE Workshop on Broadband Seismic, Abu Dhabi, United Arab Emirates, November 2015.
   
Saleh A., El Fiki A., Rodriguez J. M., Laroche S., Castor K., Marin D., Bianchi T., Bertrand P., Herrmann P. paper talk
  A Step Change in Seismic Imaging Quality in Western Desert of Egypt: An Acquisition case Study,
  79th EAGE Annual Meeting, Paris, France, June 2017.
   
Bianchi T., Castor K., Cotton J., Hardouin P. paper
  Random Sampling Compressive Sensing Acquisition,
  SEG workshop: Seismic with Simultaneous Sources: Where Does the Industry Stand? Muscat, Oman, Nov. 2017.

 

Other Relevant Communications

Castor K., Montembault V., Béquin Ph.,
  Ionic loudspeaker using negatives point-plane discharges,
  3rd International Student Conference on Electrical Engineering, Prague, Czech Republic, may 1998.
   
Castor K., Gerstoft P., Roux Ph., Kuperman W. A., McDonald B. E., abstract
  Nonlinear effects in long range propagation,
  144th Meeting of the Acoustical Society of America - 1st Pan-American/Iberian Meeting on Acoustics, Cancun, Mexico, december 2002.
   
Castor K., Roux Ph., Gerstoft P., Kuperman W. A., McDonald B. E., abstract
talk
  Nonlinear modes interaction in an acoustics waveguide,
  146th Meeting of the Acoustical Society of America, Austin, USA, nov. 2003.
   
Castor K., Gerstoft P., Roux Ph., Kuperman W. A., McDonald B. E., poster
workshop
report
  Long range propagation of finite amplitude acoustic waves in an ocean waveguide,
  T-phase Workshop: "Seismo-Acoustic Applications in Marine Geology and Geophysics", Woods Hole Oceanographic Institution, MA, USA, march 2004.
   
Castor K., Sturm F., Piserchia P. F., abstract
  Acoustical propagation modeling using the three-dimensional parabolic equation based code 3DWAPE within a multiprocessing environment,
  148th Meeting of the Acoustical Society of America, San Diego, USA, nov. 2004.
   
Castor K., Sturm F., Piserchia P. F.,
  Development of numerical acoustical tools for hydroacoustic monitoring,
  Comprehensive nuclear-Test-Ban Treaty Organisation Hydroacoustics Workshop, Victoria, British Columbia, Canada, 2-5 may 2005.
   
Sturm F., Castor K.
  Examination of 3-D acoustical effects for the ASA wedge benchmark at higher frequencies using a multiprocessing parabolic equation code,
  1st Greek-French Workshop on Computational Aspects of Acoustical Propagation, Heraklion, Greece, 20-21 sept. 2006.




Teaching

1997-2001
Teaching Assistant,
University of Le Mans, France (182 hours).

Discipline Type (*) Level Years Nb. of hours
Mechanics L Deust-Vas 2nd degree 2000-01
1999-00
20H
20H
Physical and general acoustics P Deust-Vas 2nd degree 2000-01
1999-00
20H
20H
1998-99
1997-98
20H
20H
ElectroAcoustics, Electronics L Deust-Vas 2nd degree 2000-01
1999-00
1998-99
1997-98
21H
15H
15H
15H
ElectroAcoustics, Electronics P Deust-Vas 2nd degree 2000-01 48H
Physical and general acoustics
L Deust-Vas 1rst degree 1999-00
1998-99
15H
15H
Physical and general acoustics P Master in applied acoustics 1998-99
1997-98
12H
12H
Support
(signal processing, electromagnetism, mathematics, analogical electronics, electroacoustics)
L Deust-Vas 1rst degree 1998-99
1997-98
4H
24H
Vibrations
L
Deust-Vas 1rst degree
1998-99
8H
Vibrations
P
Deust-Vas 2nd degree
1997-98
12H

(*) L = Lectures (classroom), P = Practical Works (laboratory experiment instructor)




Languages

French mother tongue
English fluent (studied for 10 years, lived 2 years in the US)
Spanish

fluent (studied for 5 years, several months spent in Spain, Mexico and South America)

 

Computer Skills
Languages Fortran, C
   
Main Softwares  

Math and Digital Signal Processing

Matlab, Mapple, Mathematica, Paw

Laboratory Instrumentation Interfacing

HP-Vee, Labview

Acoustic Propagation Modeling

ONR Ocean Acoustic Library (OALIB) (Rays, Normal Modes, Parabolic Equation, Wavenumber Integration), Nonlinear Parabolic Equation (NPE, KZK), 3-D Parabolic Equation (3DWAPE)

Sound Design and Audio Production

Cubase SX, Nuendo, Reason, Ableton Live, Samplitude, Sonar, Logic Audio, Gigasampler, Soundforge
   
O. S. Linux, Unix, Windows, MS-DOS