Diode Laser-Based Sensor for Fast Measurement of Binary Gas Mixtures

摘要

The development and characterization of a gas sensor to measure binary mixtures of oxygen and the vapor from a series of volatile organic compounds, with a time resolution of 10 milliseconds, is described. The sensor is diode laser-based, all signal processing is performed digitally, and control of the sensor and electronics, data collection, and real time readout is by a laptop computer. The discussion will focus on the methods used for laser selection, phase sensitive detection, data storage, and concentration measurements for species which do not possess well resolved rotational- vibrational spectra.