Correlation spectrometer for nerve agents

摘要

A correlation spectrometer directs light from the ambient atmosphere onto a light detector, a first portion of the light being directed through a reference substance and a second portion being directed onto said light detector without passage through the reference substance, whereby the light detector provides first and second electrical signals corresponding, respectively, to said first and second light portions. The reference substance is a surrogate substance different from a substance to be detected by the spectrometer but which has a spectrum which correlates with that of the substance to be detected.