open-path sampling

A sampling method that uses an optical detection device, which consists of an emitter telescope and a receiver/detector. The source light from the emitter, ultra violet (UV) or infrared (IR), is beamed in one direction through an unconfined space (hence an open path), which contains gaseous compounds or particulate matter, to the receiver/detector in a bi-static monitor. In the case of a mono-static monitor, the emitter beams light to a reflector where the light is passed back to the emitter and collected by the receiver/detector.

Authorization Path: 2.4.5.2.20.1