In:
Atmospheric Measurement Techniques, Copernicus GmbH, Vol. 14, No. 9 ( 2021-09-28), p. 6213-6232
Abstract:
Abstract. A new compact static wind imaging interferometer, called
the Birefringent Doppler Wind Imaging Interferometer (BIDWIN), has been
developed for the purpose of observing upper atmospheric winds using
suitably isolated airglow emissions. The instrument combines a field-widened
birefringent delay plate placed between two crossed Wollaston prisms with an
imaging system, waveplates and polarizers to produce four fixed 90∘
phase-stepped images of the interference fringes conjugate to the scene of
interest. A four-point algorithm is used to extract line-of-sight Doppler
wind measurements across the image of the scene. The arrangement provides a
similar throughput to that of a field-widened Michelson interferometer;
however, the interferometric component of BIDWIN is smaller, simpler to
assemble and less complicated to operate. Consequently, the instrument
provides a compact, lightweight and robust alternative that can be
constructed and operated with lower cost. In this paper, the instrument
concept is presented, and the design and optimization of a prototype version
of the instrument are discussed. Characterization of the lab prototype is
presented, and the performance of the instrument is examined by applying the
instrument to measure a low-velocity two-dimensional Doppler wind field with
a high precision (5 m s−1) in the lab.
Type of Medium:
Online Resource
ISSN:
1867-8548
DOI:
10.5194/amt-14-6213-2021
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2021
detail.hit.zdb_id:
2505596-3
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