Differential phase delay observations with VLTI-MIDI at N-band | Zendy

Robert N. Tubbs | Zendy; Jeffrey A. Meisner | Zendy; Eric J. Bakker | Zendy; Simon Albrecht | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Differential phase delay observations with VLTI-MIDI at N-band

Author(s) -

Robert N. Tubbs,

Jeffrey A. Meisner,

Eric J. Bakker,

Simon Albrecht

Publication year - 2004

Publication title -

proceedings of spie, the international society for optical engineering/proceedings of spie

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.192

H-Index - 176

eISSN - 1996-756X

pISSN - 0277-786X

DOI - 10.1117/12.550315

Subject(s) - midi , interferometry , remote sensing , differential phase , astronomical interferometer , phase (matter) , refractive index , optics , dispersion (optics) , physics , acoustics , geology , quantum mechanics

This investigation focuses on observational measurements of the dierential,interferometric phase between spectral channels in the VLTI/MIDI instrument. Measurements of target stars are compared with theoretical predictions in order to investigate the eects,of dispersion in humid air on dierential,phase measurements at N band ( 10 µm wavelength). An accuracy of 1 degree RMS phase error is achieved after calibration during stable environmental conditions, but this accuracy is degraded if there are fluctuations in humidity between observations. Stabilisation and/or monitoring of the environmental conditions in the VLTI ducts and tunnels will be required in order to achieve the best dierential,phase performance with MIDI. The measured dierential phases are found to be consistent with a model for the refractive index of air based on the HITRAN database. Keywords: colour dierential phase, interferometry, atmospheric turbulence, humidity, longi-

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research