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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.
Linear measurement
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.
Quantitative measurement
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.
Homogeneous and stable SNR
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.
Images
Hardware features
24/365 Ready
High reliability.
Redundant ethernet ports.
Redundant power supplies. (optional)
Measurement autorecovery under sudden system restart.
Safe
Class 1 equipment safety compliant.
Automatic power reduction protocol.
Robust
Designed for industrial environment.
Rackable & transportable.
Hard case available.
Accurate
±2 uHz GPS relative synchronization.
Scalable storage
The system may include extended storage for long term measurements.
Compatible with network storage.
Four models available
30 km reach
50 km reach
70 km reach
> 90 km reach with 20 m spatial resolution (FEM and RE modules required)
Software features
HMI available to operate the HDAS
Control over measurement parameters.
Graphic data representation: strain & temperature.
Open Access to instrument response
Access to the raw data captured by the interrogator.
Enables ad-hoc post-processing for each application.
Integrable
HDAS can be controlled remotely
Fully functional TCP/IP protocol for integration with client applications.
DFOS Catalog
Download our fiber optic sensing brochure where you will find all the details of our equipment.
Our products are used by scientists all over the world
On the Detection Capabilities of Underwater Distributed Acoustic Sensing
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.
Overhead Transmission Line Sag Monitoring Using a Chirped-Pulse Phase-Sensitive OTDR
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.
Distributed sensing of microseisms and teleseisms with submarine dark fibers
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.
Real-Data Testing of Distributed Acoustic Sensing for Offshore Earthquake Early Warning
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.
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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