applications of optical sensors include: (i) measurement of physical quantities such as temperature, velocity, acceleration, strain, pressure, or shape of an object; (ii) monitoring the health of composite materials by detecting delamination, deformation, and cracking as well as measuring vibrations; (iii) measurement ...

PST's optical liquid level sensors are used all over the world and a wide range of applications. From run-dry pump protection, leak detection and high and low alarm systems. They are used to protect vital machinery, to detect level of fluids in vehicles and also to tell when there is liquid where it shouldn't be.

Chemical sensors have many applications in pollution monitoring and detection of contaminants. They are used to measure carbon monoxide levels in underground car parks and in steel plants, to detect gas build-ups in homes and coal mines, to find ammonia in frozen food and for many other applications.

3.4. There are two categories of optical sensors: intrinsic optical sensors and extrinsic optical sensors.