The purpose of this paper is to explore various techniques for detecting gases and particles, with particular application to environmental measurements.
The technique and application of infrared absorption sensing of gases is presented, followed by sorbent‐based, catalytic and electrochemical methods. Airborne particle detection techniques are then reported, including filtration, laser scattering and light detection and ranging.
Various long‐term environmental monitoring programmes measure atmospheric composition and pollution levels. Atmospheric carbon dioxide has increased by 20 per cent since 1958. Hand‐held sensors provide timely warning in fire‐fighting and industrial leakage situations.
Helps the engineer understand the principles of gas and particle detection and the capabilities of portable sensors, and extends general knowledge of environmental programmes.
