ATMOSPHERIC MONITOR BY MEANS OF CHEMILUMINESCENT REACTION

摘要

A continuous, gas phase chemiluminescent monitor is disclosed. Air is introduced into a reaction chamber through an elongated nozzle. A chemiluminescent reagent gas such as ethylene for detecting ozone or ozone for detecting nitrogen oxides is injected into an annular inlet surrounding the air nozzle. The gases mix within a mixing chamber at the end of the concentric nozzle and form a turbulent flowing mixture which exits through the orifice of the nozzle and reacts within the reaction chamber. A light detector such as a photomultiplier tube is disposed adjacent the chamber and the chemiluminescent output of the reaction is detected and the signal is amplified and recorded, preferably as a digital readout. The flow rate of reagent gas is controlled at the inlet while the flow rate of air is controlled by means of a vacuum pump attached to the outlet of the reaction chamber, preferably by a pump incorporating an electronically driven diaphragm.