Optical fibers are passive sensors
Distributed Acoustic Sensing is a sensing system based on light. An optical fiber replaces traditional discrete sensors and lets you measure sound along with its entire length.
The sensor is a standard, unmodified telecom fiber and has many advantages: Fibers are easy to install, they enable measurements of thousands of locations, they cover a large geographical range, they are immune to electromagnetic interference, they do not carry any electrical power, and they are highly reliable and cost-efficient.
Install the fiber where you want to supervise, e.g., a fence, and it will pick up any acoustic disturbance. Or you may even have access to pre-installed unused telecom fibers (dark fibers), eliminating the need for new fiber installations.
It works over long distances and large areas, without any disruption, and sends responses in real-time.
Ultra-precise detection gives you the exact position
DAS systems are based on interferometric sensing. An ultra-stable, low-noise laser – such as our Koheras lasers – is built into an interrogator that sends light into the fiber and detects the backscattered light.
Complex algorithms analyze what is going on along the fiber, with high precision.
The interpretation software detects every incident but ensures that only relevant information is passed on to the operators. Ultra-precise detection reveals the exact position of the incident, eliminates uncertainties, and saves time.
What do you want to protect?
You can monitor a lot of critical assets and infrastructures with a DAS system; power plants, airports, borders, large facilities, pipelines, etc.
Low phase-noise, narrow linewidth, and long coherence length are essential
Our Koheras lasers are a suitable choice for DAS systems due to their industrial design, their inherent low-noise properties, and their stable performance that is unaffected by different environmental conditions and wide temperature ranges in the field.
World-leading acoustic sensing systems use our Koheras lasers due to the intrinsic low phase-noise, the narrow linewidth, and the long coherence length that enable measurement ranges of around 100 km.
The most reliable low-noise lasers on the market
Our fiber laser design is inherently compact and robust. It is developed for a long lifetime in demanding environments where uptime is critical. With documented low failure rates, we proudly deliver the most reliable low-noise lasers on the market.
We have more than 10,000 Koheras lasers deployed in the harshest environments on – and off – the planet. We have lasers on oil-rigs, in submarines, on wind turbines, and even in space. With over 20 years of experience, we know they last.
Features
- Low phase-noise and long coherence length provide sensing distances of +100 km
- Accurate pinpointing of intrusion or threat
- Industrial reliability due to robust laser design
- Designed for OEM-integration
