Light is heat detective

A temperature sensor developed for use in fire monitoring systems is claimed to overcome the problem of interference from nearby electrical equipment. Newcastle inventor John Cross McNab has applied for a patent on his idea, which uses fibre optic cable looped inside heat shrinkable material. When the temperature exceeds the activation temperature of the material […]

A temperature sensor developed for use in fire monitoring systems is claimed to overcome the problem of interference from nearby electrical equipment.

Newcastle inventor John Cross McNab has applied for a patent on his idea, which uses fibre optic cable looped inside heat shrinkable material.

When the temperature exceeds the activation temperature of the material it shrinks, forcing the cable to form a tighter loop.

As the loop decreases below the critical bend radius, a light change can be detected.