Acquisition unit

Distributed Acoustic Sensing (DAS)

Distributed Acoustic Sensing (DAS) is a fiber-optic interrogator that delivers continuous (distributed), low-noise quantitative measurements of the optical phase along the entire length of standard telecommunication fibers.

Distributed Acoustic Sensing (DAS)
DAS acts as an array of thousands of microphones/geophones without electrical cables or batteries, allowing for much simpler installation and reduced maintenance costs. DAS integrates both the optical system and the control/processing hardware into a single unit, providing a complete stand-alone solution that can be connected to already installed fiber optic cables. It comes with a software suite that enables full control and customization of measurements, as well as real-time or offline data visualization and processing.
Additional Matlab and Python libraries are available upon request for data management and processing. Real-time data streaming, remote control, and configuration are available via the ZeroMQ protocol.
Applications
  • Structural Health Monitoring
  • Seismic monitoring and Earthquake detection
  • Subsea infrastructure monitoring
  • Real-time traffic monitoring on roads and motorways
  • Telecom network infrastructures integrity monitoring
Bridges and Infrastructure
Civil and residential, HVSR
Tunnels
Seismic and microseismic networks
Technical characteristics
Optical specifications
Sensing range40 km
Number of channels1, 2 available on request
Acquisition frequency1 to 100 kHz
Spatial resolution5 to 50 m
Gauge length5 to 50 m
Spatial sampling0.2 to 1. 6m
Noise floor10 pε/√Hz
Operating wavelength1550 nm
Optical power (peak)23 dBm typ
One-way power budget8 dB
Fiber typeSMF/MMF
Fiber connectorsFC/APC (other available on request)
Physical characteristics
EnclosureAluminum rack mount cabinet (Rigid and lightweight ABS carrying case available upon request)
Operating Temperature range0 to 50 °C
Storage temperature range-20 to +70 °C
Humidity10-100% non-condensing
Dimensions19” 4U (LxWxH) 550x180x430 mm
Weight18 Kg