Designed for atmospheric pollution monitoring, a breadboard model of a new
Michelson interferometer has been developed. It utilizes a nutating
retroreflector to generate alterations in the geometrical and optical paths. The
forward–backward stop–and–go movement of a reflecting
element of conventional Michelson interferometers is thus replaced by a
continuous rotation. At this state the instrument employs a 6.3-cm(2.5-in.) diam
rotating retroreflector, a ZnSe beam splitter, and a HgCdTe detector at liquid
nitrogen temperature, sensitive in the 8–14-μm
band. It allows spectral resolutions of up to 2 cm−1. The
device is linked via an analog digital interface to a desktop computer which
performs interferometer control, data acquisition, Fourier transform, and
display of the spectra.
© 1990 Optical Society of America
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