Embed Size (px)
Citation preview
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) [email protected]
© 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
© 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
© 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)
© Muquans 2017
The Absolute Quantum Gravimeter
First industrial gravity meter based on cold atoms
Workshop RESIF - Brissac
© 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
© 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
© 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
© 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)
© Muquans 2017
AQG A01 results
• Sensitivity and stability (2nd floor lab, city building) • µGal long-term stability
Workshop RESIF - Brissac
© 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
© 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
© 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
