Sense and sensitivity

摘要

Conventional foil based electrical strain gauges have been around for more than 70 years. They are very widely used - in structural testing rigs or as permanent structural integrity monitors, in weighing systems and in sensors measuring parameters as diverse as torque and pressure. A relative newcomer is the optical strain gauge, based on glass fibre Bragg grating sensors (exploiting a phenomenon discovered by Nobel laureates. Sir William Henry Bragg and his son, William Lawrence Bragg in the early part of the 20th century).