High-Fidelity Distributed Acoustic Sensor
HDAS is a High-Fidelity Distributed Acoustic Sensor that detects vibrations in tens of kilometers. With its proprietary linear measurement technology, it provides unmatched signal quality across all measured fiber length and magnitude measurement capabilities.
The HDAS box is conceived as a scientific instrument, with comprehensive tools to measure, record and analyze the signals present in the fiber. Furthermore it can also be used as a platform for application development, allowing third party data processing directly on the main processing unit.
Among all the DAS technologies available in the market, there are some that stand out for their simplicity and low cost, such as the intensity Φ-OTDR, or for their performance, as would be the case of the dual pulse Φ-OTDR.
Both technologies, in terms of parameters concerning the quality and fidelity of the measurement, have been compared with the HDAS technology in the following graph. This comparison highlights the high fidelity the HDAS provides and how, thanks to its patented technology, it differs from existing technologies.
Linearity implies that the measurement varies in proportion to variations in the perturbations received from the input. The Absence of it causes harmonics to enter the signal, resulting in the disappearance of the original slope and preventing the observed perturbations from behaving as they truly would.
HDAS is linear, does not introduce harmonics.
The measurement changes in direct proportion to a change in the input perturbation.
HDAS provides high-fidelity measurements, improving pattern analysis and reducing the number of incorrect classifications.
A quantitative measurement provides the capability of quantifying the sensed perturbations, which means that each of those perturbations are detected as a concrete strain or temperature value and that their variations can be followed and characterized.
The detected variations are measurable as strain or temperature values.
Quantitative information is much more meaningful.
Thresholding becomes much easier reducing false alarms.
The SNR (Signal to Noise Ratio) in non-linear DAS and phase DAS systems degrade with distance. Moreover, non-linear DAS technologies result in fading points: points that are temporary blinded from actual events.
HDAS maintains SNR level for all the fiber (like FM vs AM radio).
HDAS has no fading points.
Our products are used by scientists all over the world
The ability to record ground deformations in the Mediterranean is analyzed, finding correlations with recording quality, bathymetry, and phase velocities. DAS data is compared with terrestrial motion spectra, highlighting its potential for seismic monitoring and early earthquake warning.
Real-time monitoring of transmission line sag via DAS enables dynamic capacity adjustments, reducing risks and enhancing efficiency. Analyzing strain in the frequency domain allows for sag calculation. Tracking each span with a single interrogator improves safety and performance.
Sparse oceanic seismic monitoring limits our understanding. DAS technology repurposes submarine cables for seismic observation. Offshore Belgium, a study using a 4192-sensor DAS array observed microseism, local waves, and a teleseismic earthquake, showcasing DAS’ potential for future submarine seismic networks.
Earthquake early warning is tested at sea using DAS on submarine cables. Results show an improvement in alert time of up to 3 seconds compared to land-based seismic stations. Simulation suggests that multiple DAS arrays along the coast could enhance alert times by over 5 seconds in subduction zones.
// Patented DAS system
HDAS is a revolutionary DAS system based on our patented “Chirped-pulse phase-OTDR” technology.
HDAS technology is considered one of the highest fidelity DAS technology as it provides linear and quantitative response, with extremely high sensitivity and homogeneous performance along the fiber without fading.
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