Spectroscopic analysis apparatus employing measurement and reference radiation

摘要

The apparatus comprises a coherent radiation source which emits, in succession, respective ones of a plurality of different wavelengths. The emitted radiation is separated into a reference portion and a measurement portion. The measurement portion propagates through a medium such as the atmosphere to be analyzed and is received by a measurement detector. The reference portion is received directly by a reference detector. A processing circuit processes signals representing the portions, produced by the detectors to produce numerical data relating to the spectral analysis of the medium.