Doppler asymmetric spatial heterodyne spectroscopy (DASH): concept and experimental demonstration

Englert, C. R.; Babcock, David D.; Harlander, John M.

doi:10.1364/ao.46.007297

Cited by 103 publications

(101 citation statements)

References 17 publications

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“…45/ √ 5) for a ∼ 7 min measurement. The DASH instrument (Englert et al, 2007) was recently used in field measurements at a mid-latitude site to compare results to a Fabry-Perot interferometer (Englert et al, 2012). For this comparison, 5 min integrations were taken and the oxygen red line was observed.…”

Section: Discussionmentioning

confidence: 99%

Calibration and validation of the advanced E-Region Wind Interferometer

et al. 2013

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The advanced E-Region Wind Interferometer (ERWIN II) combines the imaging capabilities of a CCD detector with the wide field associated with field-widened Michelson interferometry. This instrument is capable of simultaneous multi-directional wind observations for three different airglow emissions (oxygen green line (O(¹S)) at a height of ~97 km, the ^PQ(7) and ^P(7) emission lines in the O₂(0–1) atmospheric band at ~93 km and P₁(3) emission line in the (6, 2) hydroxyl Meinel band at ~87 km) on a three minute cadence. In each direction, for 45 s measurements for typical airglow volume emission rates, the instrument is capable of line-of-sight wind precisions of ~1 m s⁻¹ for hydroxyl and O(¹S) and ~4 m s⁻¹ for O₂. This precision is achieved using a new data analysis algorithm which takes advantage of the imaging capabilities of the CCD detector along with knowledge of the instrument phase variation as a function of pixel location across the detector. This instrument is currently located in Eureka, Nunavut as part of the Polar Environment Atmospheric Research Laboratory (PEARL) (80°N, 86° W). The details of the physical configuration, the data analysis algorithm, the measurement calibration and validation of the observations from December 2008 and January 2009 are described. Field measurements which demonstrate the capabilities of this instrument are presented. To our knowledge, the wind determinations with this instrument are the most accurate and have the highest observational cadence for airglow wind observations of this region of the atmosphere and match the capabilities of other wind-measuring techniques

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Section: Discussionmentioning

confidence: 99%

Calibration and validation of the advanced E-Region Wind Interferometer

et al. 2013

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“…Later the Doppler Michelson approach was implemented in the SHS configuration and a laboratory demonstration was conducted [13], called Doppler Asymmetric Spatial Heterodyne (DASH). This was followed by field demonstrations of wind measurements observing the O ( 1 D) atomic oxygen emission [14].…”

Section: The Conceptmentioning

confidence: 99%

Development of wind measurement systems for future space missions

Shepherd

2015

Acta Astronautica

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“…Using analytical error propagation, we determined that the statistical uncertainty in the noisy interferogram is equivalent to the uncertainty in the associated absorption feature. 16 Next the standard deviations of these simulated methane absorption features (marked in Fig. 9) were converted into an equivalent VMR uncertainty.…”

Section: Ch 4 Linesmentioning

confidence: 99%

High sensitivity trace gas sensor for planetary atmospheres: miniaturized Mars methane monitor

Englert

Stevens

Brown

et al. 2014

J. Appl. Remote Sens

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Abstract. Highly sensitive trace gas measurements in planetary atmospheres can yield information about a planet's atmosphere and surface. One prominent example is methane in the Martian atmosphere, which could originate biogenically and provides answers to one of the most intriguing questions in planetary science: "Does life currently exist on Mars?" Recently, in situ measurements by the Mars Science Laboratory (MSL) have resulted in an upper limit of 1300 parts per trillion by volume (pptv), whereas previous measurements using terrestrial telescopes and an instrument orbiting Mars reported significantly higher values of 10,000 pptv or more. These results are not necessarily contradictory, due to the possibility of spatial and temporal variability of the trace gas concentration. Thus, more measurements will be required to gain clarity. The concept of a miniaturized Mars methane monitor, a high spectral resolution, midinfrared spectrometer observing the sun through the Mars atmosphere from either the Mars surface, a Mars balloon or plane, or a Mars orbiting satellite is presented. The instrument would measure atmospheric methane and water vapor volume mixing ratios with equal or higher precision than the tunable laser spectrometer on MSL. The spectrometer concept uses the spatial heterodyne spectroscopy technique, which has previously been used for ground-and space-based observations of the Earth's atmosphere. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Doppler asymmetric spatial heterodyne spectroscopy (DASH): concept and experimental demonstration

Cited by 103 publications

References 17 publications

Calibration and validation of the advanced E-Region Wind Interferometer

Calibration and validation of the advanced E-Region Wind Interferometer

Development of wind measurement systems for future space missions

High sensitivity trace gas sensor for planetary atmospheres: miniaturized Mars methane monitor

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