Un gravimètre à atomes froids transportable pour les applications géophysiques

Présentation de Vincent Ménoret (Muquans) au Workshop "Instrumentation Géophysique" | 3-5 juillet 2017, Brissac

Transcript

1. Un gravimètre à atomes froids transportable pour les applications géophysiques Brissac – 3 juillet 2017 V. Ménoret, P. Vermeulen, B. Desruelle (Muquans) N. Le Moigne (Géosciences Montpellier) S. Bonvalot, G. Gabalda (GET / OMP Toulouse) vincent.menoret@muquans.com
2. © Muquans 2017 Workshop RESIF - Brissac Outline – Presentation of Muquans • The Absolute Quantum Gravimeter – Instrument overview – Specifications and main features – Measurement results – Development of a field version
3. © Muquans 2017 Cold atom gravity meter (Δg/g≈10-9) Atomic clock (Δf/f≈10-15) Laser systems for atom cooling and precision spectroscopy (Δλ/λ≈10-10) Frequency transfer over optical fibers (Δf/f≈10-20) Muquans • Company located in Talence (33), created in 2011 • 23 employees • Specialized in high precision instrumentation Workshop RESIF - Brissac
4. © Muquans 2017 Workshop RESIF - Brissac Partnership with academic research Technology transfer Patent license User feedback Field expertise Innovative product Research perspectives New laser components N. Le Moigne (Géosciences Montpellier) S. Bonvalot (GET / OMP) G. Gabalda (GET / OMP)
5. © Muquans 2017 The Absolute Quantum Gravimeter First industrial gravity meter based on cold atoms Workshop RESIF - Brissac
6. © Muquans 2017 Workshop RESIF - Brissac System description Sensor head (30 kg) Power electronics (35 kg) Control electronics and laser system (58 kg) First version dedicated to controlled environments
7. © Muquans 2017 Main scientific features of the AQG • Absolute gravity measurements at the µGal level (10-9 g) • Continuous measurements • No moving mechanical parts • Easy to operate Workshop RESIF - Brissac
8. © Muquans 2017 System specifications Performances (demonstrated): Physical package: Sensitivity 50 μGal/√Hz (1 µGal in 40 min) Longterm stability 1 µGal Accuracy few µGal Dimensions Sensor head: h = 70 cm, diam = 38 cm Laser :100 x 50 x 70 cm3 Mass 100 kg (instrument only) Power consumption 250 W Workshop RESIF - Brissac
9. © Muquans 2017 Workshop RESIF - Brissac Transportability - Instrument has travelled over 7000 km in the last 2 years (several comparison campaigns: Larzac, Trappes) - Transport in a small van, manipulation by 2 people Collab. S. Merlet (LNE-SYRTE)
10. © Muquans 2017 AQG A01 results • Sensitivity and stability (2nd floor lab, city building) • µGal long-term stability Workshop RESIF - Brissac
11. © Muquans 2017 Instrument status • AQG A01 operational • New measurement campaign in Larzac Observatory starting today • Next units in production • Upgrade to a field version Workshop RESIF - Brissac
12. © Muquans 2017 Field gravimeter • Same performance as AQG A • Improved transportability and resistance to environment • Extended operating temperature range • AC or DC power supply • To be delivered to RESIF at the end of 2018 Workshop RESIF - Brissac
13. © Muquans 2017 Conclusion • Absolute Quantum Gravimeter operational • 1 µGal stability demonstrated, continuous absolute measurements • Further characterization for geophysics applications in collaboration with RESIF • Simple operation and manipulation • Field version under development • Same level of performance • Improved transportability • Operation in difficult environments Workshop RESIF - Brissac