Found 4 talks width keyword photometers

Friday November 6, 2020

The Use of the Inhomogeneities of the Sodium Layer for Measuring the Atmospheric Turbulence, Including Tip-Tilt!

IAC

Abstract

An original method for measuring the atmospheric turbulence is described, capable of even measuring the tip-tilt, which normally requires a dedicated natural star and nowadays defines the practical limit of the adaptive optics technique. The method is based in the illumination of a wide area of the Sodium Layer, and to use their inhomogeneities as a reference. Sevaral analysis and simulation results will be presented.

Zoom link:
https://rediris.zoom.us/j/87053930312

Enlace youtube: https://youtu.be/c1TCdt_-S_o

Archived in: Telescopes and instrumentation - Keywords:telescope, photometers, adaptive optics, turbulence

Abstract

Thursday February 21, 2019

Airborne Infrared Astronomy with SOFIA (part II)

Severo Ochoa senior researcher

Abstract

TBD

Archived in: Telescopes and instrumentation - Keywords:photometers, spectrographs

Abstract

Tuesday February 19, 2019

Airborne Infrared Astronomy with SOFIA (part I)

Deutsches SOFIA Institut, Univ. of Stuttgart, Germany (retired)

Abstract

SOFIA, short for Stratospheric Observatory for Infrared Astronomy,

is a 2.7m telescope flying on a Boeing 747SP at altitudes of 12-14km,

to detect and study mid- and far-infrared radiation that is blocked

by water vapor in the earth's atmosphere and cannot reach the

ground. It is the successor to the Kuiper Airborne Observatory (1974-1995)

and currently the only access to and platform for astronomical observations

in the far-infrared (30-300 microns), except for balloon-borne telescopes.

SOFIA normally flies out of California, but once a year also

deploys to the Southern Hemisphere (usually to Christchurch,

New Zealand), benefitting from the excellent wintertime

stratospheric conditions to study the rich southern skies.

Although a bilateral project (80:20)

between USA (NASA/USRA) and Germany (DLR/DSI), it is open for

proposals from the world-wide astronomical community at large.

It addresses many science questions that ESA's successful but

now extinct Herschel Observatory has left unanswered and

offers observational opportunities similar to and beyond Herschel.

SOFIA also has many synergies with ALMA and APEX, as well as IRAM

and other submm and radio telescopes.

In part I of this SOFIA lecture, I will introduce the observatory

in general, the plane, the telescope, the mode of operation, and

in particular the current and future instrumentation.

In part II (later this week), I will present a glimpse of SOFIA science

highlights and discoveries in its first 6 years of operation

(since 2012), including the most recent astrophysical and astrochemical

results. I will also address its future ISM and star formation potential.

SOFIA is a unique observatory, different from ground-based and

space platforms, which will serve the mid- and far-infrared

astronomical community for many years to come.

It is a fascinating experience to fly on SOFIA!

Archived in: - Keywords:telescope, spectrographs, photometers, Herschel

Abstract

Thursday April 8, 2010

Using artificial sky glow to retrieve night time aerosol optical depth

Université de Sherbrooke, Canada

Abstract

Measuring the Aerosol Optical Depth (AOD) is of particular importance in monitoring aerosol contributions to global radiative forcing and air quality. Most measuring methods are based on direct or indirect observation of sunlight and thus are only available for use during daylight hours. Attempts have been made to measure AOD behavior at night from star photometry, and more recently moon photometry. Star photometry method uses spectrally calibrated stars as reference targets this provides somewhat more flexibility than a sun photometer but there are low-signal and calibration issues which can make these measurements problematic. Moon photometry is only possible when the moon is present in the sky. We suggest a complementary method, based on the observation of artificial sky glow generated by light pollution. The methodology requires (1) the implementation of an heterogeneous 3D light pollution model and (2) the design of an automated light pollution spectrometer which will be presented here. The instrument designated as the Spectrometer for Aerosol Night Detection (SAND) is now in its third version. Basically, SAND-3 is an automated CCD based, long-slit spectrometer protected from inclement weather by an acrylic dome. SAND have been used successfully in many astronomical sites along with some urban sites. Our first day/night (continuity) AOD measurements comparisons with AERONET/AEROCAN sunphotometer data will be shown for Sherbrooke university (Quebec, Canada) atmospheric optical observatory.

Archived in: Telescopes and instrumentation - Keywords:photometers, atmospheric effects

Abstract

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