Infrared heterodyne interferometry at Calern Observatory Jean GAY Astronome émérite à l’Observatoire de la Côte d’Azur With help of Yves Rabbia Astronome.

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Presentation transcript:

Infrared heterodyne interferometry at Calern Observatory Jean GAY Astronome émérite à l’Observatoire de la Côte d’Azur With help of Yves Rabbia Astronome à l’Observatoire de la Côte d’Azur

summary The state of science on seventeens Heterodyne interferometry Initial experiments Atmospheric absorption SOIRDETE experiment bilan

summary The state of science on seventeens Heterodyne interferometry Initial experiments Atmospheric absorption SOIRDETE experiment bilan

what science for the seventies ? extensive surveys from ground-based facilities strongly emitting sources Stars embedded in dust (IRC 10076) What size of IR sources? no telescope able to reach a 1 arcsec angluar resolution in thermal IR no adaptive optics device no IR-ccd camera yet available by this time

The state of science on seventeens Heterodyne interferometry Initial experiments Atmospheric absorption SOIRDETE experiment bilan

Principle of infrared heterodyne

heterodyne current, an example, for reluctant pupils, illustrating the interest of knowing (a+b)^2

only frequencies accepted by the detector are transmitted to the amplifier

electrical bandpass imposed by the detector's response

electrical bandpass limited by the amplifier

Narrow bandwidth,so large coherence length

but limited SNR (proportional to the wavelength, no pb in radio-astronomy and millimeter, but disastrous in visible) exploitable in thermal infrared

summary The state of science on seventeens Heterodyne interferometry Initial experiments Atmospheric absorption SOIRDETE experiment bilan

1

2

solar fringes for different base-lines

Fringes visibility on the sun at 11  m

Expected interferometric SNR on Betelgeuse with two 1 m telescopes

Heterodyne detection of Arcturus at OHP april

summary The state of science on seventeens Heterodyne interferometry Initial experiments Atmospheric absorption SOIRDETE experiment bilan

summary The state of science on seventeens Heterodyne interferometry Initial experiments Atmospheric absorption SOIRDETE experiment bilan

evocative scents program for Grace, perfume city

SOIRDETE in winter 1973

2 one meter telescopes for a 15 m baseline

First heterodyne fringes at SOIRDETE (August )

summary The state of science on seventeens Heterodyne interferometry Initial experiments Atmospheric absorption SOIRDETE experiment bilan

BILAN Jitter of the laser? Capricious telescopes tracking? Too small bandwidh? Poor quality telescope mirrors? Atmospheric turbulence not enough corrected? (tilt only) Direct interferometry is easier!

First direct fringes in K band

First fringes in N band and frequency analysis of the interferogramm (lower, see ozone absorption)