In this piece, Richard Kluth explores how continuous fiber optic linear heat detection is shifting the fire safety gold standard from emergency response to automated suppression and even incident prevention.
Fire safety has traditionally been built around emergency response, even in critical infrastructure. Early detection has been considered the gold standard: the faster a fire is identified, the greater the opportunity to limit its impact.
Richard Kluth
But in high-risk, high-value settings, does that go far enough? By the time a set heat threshold is breached at a point-sensor in these volatile environments, significant damage may already be underway, with lives put at risk.
What if you could act sooner, mitigating risks even before a fire develops? Or trigger integrated and targeted isolation and suppression responses, at the moment of detection?
Continuous fiber optic linear heat detection makes that possible.
Measuring heat with light
Continuous fiber optic linear heat detection (FO LHD) takes a fundamentally different approach from traditional point-based systems. Instead of relying on sensors placed at fixed locations, FO LHD uses a passive fiber optic cable as a continuous sensing element along its entire length.
The system includes an optoelectronic unit that contains laser and signal-processing electronics. This unit sends pulses of light through a standard fiber optic cable; the same type normally used for telecommunications. As the light travels through the fiber, it naturally interacts with the glass, and a very small amount of that light is scattered back toward the instrument.
By analyzing this returning light with sensitive electronics, the system can determine the temperature at every point along the fiber, meaning the entire cable becomes a continuous temperature sensor. It is a gamechanger across the energy supply chain, with applications from monitoring pipelines to safeguarding battery storage facilities.
A LHD system can not only detect a rapid rate of temperature rise that might indicate the early stages of a fire – it can also identify slow-developing hotspots. Adaptive algorithms analyze this data, to distinguish normal environmental changes from genuine fire risks.
Overheating equipment, electrical faults, or mechanical wear often manifest as temperature changes. If identified, they provide a critical window to intervene, whether through maintenance or operational adjustments, before a fire develops.
Speed, precision and automated response
In critical energy infrastructure, where downtime or damage carries enormous economic and societal consequences, precision can be just as important as speed. Conventional detection systems often provide only a general indication of a fire, leading to broad emergency responses, such as shutting down large sections of a plant or pipeline. While effective at containing risk, this can result in unnecessary collateral damage and costly operational disruption.
When FO LHD is integrated directly into control and suppression systems, it unlocks highly targeted, automated action. A fire risk can be detected within seconds, and at the same time, precise location identification means targeted systems can focus on the exact source, minimizing damage, disruption and downtime.
Defying harsh environments
Bandweaver’s RapidScan smart alarm technology allows for such precision even in the face of environmental challenges. Scanning the full fiber length every five seconds, it uses adaptive rate-of-rise and hotspot deviation algorithms – typically configured at a 10°C threshold – to detect a developing fire far earlier than conventional absolute alarm levels, which are commonly set around 57°C. That fixed absolute threshold creates real problems at the extremes: in cold climates a fire can develop significantly before ambient temperatures climb high enough to trigger it, while in hot climates where ambient conditions already approach that level, the risk of a false positive alert is ever-present. Because RapidScan alarms are fully configurable, they can be optimized for the specific environment, delivering reliable early detection whether a system is deployed in sub-zero conditions or in the heat of a desert facility.
The sensing cable contains no openings or moving parts, requires no power along its length and is immune to electromagnetic interference. It is highly robust, unaffected by humidity or dust which can make conventional smoke detection systems unreliable, either causing false alarms or blocking sensors. For the same reasons, it’s also easier to install and maintain.
Another advantage is longevity. Fiber optic cables in telecommunications have been reliably in use for decades, so the expected lifespan of these systems can easily exceed 30 years – in many cases, much longer.
A new safety benchmark
Fire safety is a naturally conservative sector. with an understandable bias towards ‘tried and tested’ tools. New technologies must be proven over time before they are widely adopted, creating some delay between technological innovation and regulatory adoption. Sadly, too often change only comes after major incidents highlight the flaws in existing systems.
However, as infrastructure becomes more complex and valuable, the emphasis is shifting from simply responding to incidents toward smarter suppression and even preventing fires in the first place.
Continuous monitoring technologies such as fiber optic sensing play a key role in that shift, helping protect workforces, ensuring operational continuity, and safeguarding multi-million-pound assets.
Richard Kluth
www.bandweaver.com
Richard Kluth is Managing Director of Bandweaver. Bandweaver, founded in 2002, manufactures and distributes advanced fiber optic monitoring sensors and integrated technologies, enabling customers to monitor, secure and keep personnel and critical assets safe. With an installed base of over 60,000km and 8000 systems worldwide, Bandweaver provides solutions for fire & security, power & utilities, pipeline & process and oil & gas sectors.
