1 Atmospheric Limits to Precision William van Altena Yale University Basic Astrometric Methods Yale University July 18-22, 2005.

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Presentation transcript:

1 Atmospheric Limits to Precision William van Altena Yale University Basic Astrometric Methods Yale University July 18-22, 2005

2 Point Spread Functions before the Atmosphere

3 Diffraction Rings & the Secondary Mirror

4 Encircled Energy

5 Corrugated Wavefront

6 Refraction in the Atmosphere

7 Refraction as f( 

8 Refraction - second order effects

9 Effective Wavelength

10 Transmission & Sensitivity Curves

11 Spectral Energy Distributions

12 Atmospheric Turbulence

13 Temperature Fluctuations

14 Degradation Function

15 Degradation Function ~ Gaussian

16 Turbulence Scale Length

17 Zenith Distance

18 Air Mass

19 Image Motion - Lick Observatory Seeing ~1” ~2”

20 The Observables

21 How Adaptive Optics Works

22 Natural Guide Stars

23 Artificial Guide Stars

24 Multi-Node Guide Stars

25 WIYN Tip-Tilt Module First Order Adaptive Optics

26 Tip-Tilt Corrections

27 Image Motion - Two Cases

28 Total Image Motion

29 Relative Image Motion

30

31 Precision Limits due to Atmosphere

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