Improvement in performance of a TeO2acousto-optic imaging spectrometer

Voloshinov, V. B.; Yushkov, Konstantin B.; Linde, B.

doi:10.1088/1464-4258/9/4/006

Cited by 76 publications

(41 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The parameters of an AOTF are defined by the crystal elastic and optical properties and by the propagation directions of light and sound in the frame of the crystal axes (Voloshinov et al, 2007). The AOTF we used was manufactured out of a TeO 2 crystal by the company Gooch & Housego (UK).…”

Section: Instrument Conceptmentioning

confidence: 99%

The AOTF-based NO2 camera

et al. 2016

View full text Add to dashboard Cite

Abstract. The abundance of NO 2 in the boundary layer relates to air quality and pollution source monitoring. Observing the spatiotemporal distribution of NO 2 above welldelimited (flue gas stacks, volcanoes, ships) or more extended sources (cities) allows for applications such as monitoring emission fluxes or studying the plume dynamic chemistry and its transport. So far, most attempts to map the NO 2 field from the ground have been made with visible-light scanning grating spectrometers. Benefiting from a high retrieval accuracy, they only achieve a relatively low spatiotemporal resolution that hampers the detection of dynamic features.We present a new type of passive remote sensing instrument aiming at the measurement of the 2-D distributions of NO 2 slant column densities (SCDs) with a high spatiotemporal resolution. The measurement principle has strong similarities with the popular filter-based SO 2 camera as it relies on spectral images taken at wavelengths where the molecule absorption cross section is different. Contrary to the SO 2 camera, the spectral selection is performed by an acoustooptical tunable filter (AOTF) capable of resolving the target molecule's spectral features.The NO 2 camera capabilities are demonstrated by imaging the NO 2 abundance in the plume of a coal-fired power plant. During this experiment, the 2-D distribution of the NO 2 SCD was retrieved with a temporal resolution of 3 min and a spatial sampling of 50 cm (over a 250 × 250 m 2 area). The detection limit was close to 5 × 10 16 molecules cm −2 , with a maximum detected SCD of 4 × 10 17 molecules cm −2 . Illustrating the added value of the NO 2 camera measurements, the data reveal the dynamics of the NO to NO 2 conversion in the early plume with an unprecedent resolution: from its release in the air, and for 100 m upwards, the observed NO 2 plume concentration increased at a rate of 0.75-1.25 g s −1 . In joint campaigns with SO 2 cameras, the NO 2 camera could also help in removing the bias introduced by the NO 2 interference with the SO 2 spectrum.

show abstract

Section: Instrument Conceptmentioning

confidence: 99%

The AOTF-based NO2 camera

et al. 2016

View full text Add to dashboard Cite

show abstract

“…A non-collinear device is one where the input light beam and the RF acoustic wave are not aligned. Thanks to recent advancements in non-collinear AOTF technology these devices now have relatively high efficiency and robust imaging quality (Georgiev et al, 2002;Voloshinov et al, 2007).…”

Section: Acousto-optical Tunable Filtermentioning

confidence: 99%

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

et al. 2016

View full text Add to dashboard Cite

Abstract. The Aerosol Limb Imager (ALI) is an optical remote sensing instrument designed to image scattered sunlight from the atmospheric limb. These measurements are used to retrieve spatially resolved information of the stratospheric aerosol distribution, including spectral extinction coefficient and particle size. Here we present the design, development and test results of an ALI prototype instrument. The longterm goal of this work is the eventual realization of ALI on a satellite platform in low earth orbit, where it can provide high spatial resolution observations, both in the vertical and cross-track. The instrument design uses a large-aperture acousto-optic tunable filter (AOTF) to image the sunlit stratospheric limb in a selectable narrow wavelength band ranging from the visible to the near infrared. The ALI prototype was tested on a stratospheric balloon flight from the Canadian Space Agency (CSA) launch facility in Timmins, Canada, in September 2014. Preliminary analysis of the hyperspectral images indicates that the radiance measurements are of high quality, and we have used these to retrieve vertical profiles of stratospheric aerosol extinction coefficient from 650 to 1000 nm, along with one moment of the particle size distribution. Those preliminary results are promising and development of a satellite prototype of ALI within the Canadian Space Agency is ongoing.

show abstract

“…Longitudinal chromatic aberrations are caused by the dispersion of refractive indices of acoustooptic crystals [9]. Without special care of the problem, that type of aberrations results in defocusing of the image while tuning the transmitted optical wavelength [11].…”

Section: Aberration Issuesmentioning

confidence: 99%

Recent Advances in Acousto-Optic Instrumentation for Astronomy

et al. 2015

View full text Add to dashboard Cite

We report recent progress and new developments of acousto-optic imaging spectrometers and spectropolarimeters for astronomical observations. Prototype performance of hyperspectral visible-to-near-UV and visible-to-near-IR imaging systems is demonstrated. Wide-angle acousto-optic paratellurite monochromators were designed and fabricated. The problem of artifacts in spectral images of celestial objects is studied.

show abstract

Improvement in performance of a TeO₂acousto-optic imaging spectrometer

Cited by 76 publications

References 13 publications

The AOTF-based NO<sub>2</sub> camera

The AOTF-based NO<sub>2</sub> camera

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

Recent Advances in Acousto-Optic Instrumentation for Astronomy

Contact Info

Product

Resources

About

Improvement in performance of a TeO2acousto-optic imaging spectrometer

Cited by 76 publications

References 13 publications

The AOTF-based NO&lt;sub&gt;2&lt;/sub&gt; camera

The AOTF-based NO&lt;sub&gt;2&lt;/sub&gt; camera

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

Recent Advances in Acousto-Optic Instrumentation for Astronomy

Contact Info

Product

Resources

About

Improvement in performance of a TeO₂acousto-optic imaging spectrometer

The AOTF-based NO<sub>2</sub> camera

The AOTF-based NO<sub>2</sub> camera